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note
	description: "EiffelVision screen, implementation interface."
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2021-02-12 03:27:07 -0900 (Fri, 12 Feb 2021) $"
	revision: "$Revision: 105192 $"

class interface
	EV_SCREEN_IMP

create 
	make
			-- Initialize Current
		require -- from  EV_ANY_I
			True
		ensure -- from EV_ANY_I
			is_initialized: get_state_flag (Is_initialized_flag)

feature -- Initialization

	make
			-- Initialize Current
		require -- from  EV_ANY_I
			True
		ensure -- from EV_ANY_I
			is_initialized: get_state_flag (Is_initialized_flag)

	old_make (an_interface: attached like interface)
			-- Create Current, a screen object.
		require -- from EV_ANY_I
			an_interface_not_void: an_interface /= Void
		ensure -- from EV_ANY_I
			interface_assigned: interface = an_interface
			base_make_called: base_make_called
	
feature -- Access

	arc_cosine (v: REAL_32): REAL_32
			-- Trigonometric arccosine of radian v
			-- in the range [0, pi]
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	arc_sine (v: REAL_32): REAL_32
			-- Trigonometric arcsine of radian v
			-- in the range [-pi/2, +pi/2]
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	arc_tangent (v: REAL_32): REAL_32
			-- Trigonometric arctangent of radian v
			-- in the range [-pi/2, +pi/2]
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	Aspect_x: INTEGER_32 = 40
			-- Relative width of a device pixel
			-- used for line drawing
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Aspect_x_y: INTEGER_32 = 44
			-- Diagonal width of a device pixel
			-- used for line drawing
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Aspect_y: INTEGER_32 = 42
			-- Relative height of a device pixel
			-- used for line drawing
			-- (from WEL_CAPABILITIES_CONSTANTS)

	frozen background_color: EV_COLOR
			-- Color displayed behind foreground features.
			-- (from EV_COLORIZABLE_I)

	background_color_internal: detachable EV_COLOR
			-- Color used to fill figures.
			-- (from EV_DRAWABLE_IMP)

	Bits_pixel: INTEGER_32 = 12
			-- Number of adjacent color bits for each pixel
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Blackness: INTEGER_32 = 66
			-- Declared in Windows as BLACKNESS
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Bs_dibpattern: INTEGER_32 = 5
			-- A pattern brush defined by a device-independent
			-- bitmap (DIB) specification.
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	Bs_dibpattern8x8: INTEGER_32 = 8
			-- Same as `bs_dibpattern`.
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	Bs_dibpatternpt: INTEGER_32 = 6
			-- A pattern brush defined by a device-independent
			-- bitmap (DIB) specification
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	Bs_hatched: INTEGER_32 = 2
			-- Hatched brush.
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	Bs_hollow: INTEGER_32 = 1
			-- Hollow brush.
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	Bs_indexed: INTEGER_32 = 4
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	Bs_null: INTEGER_32 = 1
			-- Same as `bs_hollow`.
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	Bs_pattern: INTEGER_32 = 3
			-- Pattern brush defined by a memory bitmap.
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	Bs_pattern8x8: INTEGER_32 = 7
			-- Same as `bs_pattern`.
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	Bs_solid: INTEGER_32 = 0
			-- Solid brush.
			-- (from WEL_BRUSH_STYLE_CONSTANTS)

	ceiling (v: REAL_32): REAL_32
			-- Least integral value greater than or equal to v
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	Check_instruction: INTEGER_32 = 7
			-- Exception code for violated check
			-- (from EXCEP_CONST)

	Class_invariant: INTEGER_32 = 6
			-- Exception code for violated class invariant
			-- (from EXCEP_CONST)

	clip_area: detachable EV_RECTANGLE
			-- Clip area used to clip drawing.
			-- If set to Void, no clipping is applied.
			-- (from EV_DRAWABLE_IMP)

	Clip_caps: INTEGER_32 = 36
			-- See class WEL_CLIPPING_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Color_3ddkshadow: INTEGER_32 = 21
			-- Dark shadow for three-dimensional display elements.
			--
			-- Declared in Windows as COLOR_3DDKSHADOW
			-- (from WEL_COLOR_CONSTANTS)

	Color_3dface: INTEGER_32 = 15
			-- Face color for three-dimensional display elements and
			-- for dialog box backgrounds.
			--
			-- Declared in Windows as COLOR_3DFACE
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_btnface`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_3dhighlight: INTEGER_32 = 20
			-- Highlight color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DHILIGHT
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_3dhilight`, `color_btnhilight` and `color_btnhighlight`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_3dhilight: INTEGER_32 = 20
			-- Highlight color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DHILIGHT
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_3dhighlight`, `color_btnhilight` and `color_btnhighlight`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_3dlight: INTEGER_32 = 22
			-- Light color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DLIGHT
			-- (from WEL_COLOR_CONSTANTS)

	Color_3dshadow: INTEGER_32 = 16
			-- Shadow color for three-dimensional display elements
			-- (for edges facing away from the light source).
			--
			-- Declared in Windows as COLOR_3DSHADOW
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_btnshadow`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_activeborder: INTEGER_32 = 10
			-- Active window border.
			--
			-- Declared in Windows as COLOR_ACTIVEBORDER
			-- (from WEL_COLOR_CONSTANTS)

	Color_activecaption: INTEGER_32 = 2
			-- Active window title bar. 
			--
			-- Windows 98/Me, Windows 2000 or later:
			--   Specifies the left side color in the color gradient of an active
			--   window's title bar if the gradient effect is enabled.
			--
			-- Declared in Windows as COLOR_ACTIVECAPTION
			-- (from WEL_COLOR_CONSTANTS)

	Color_appworkspace: INTEGER_32 = 12
			-- Background color of multiple document interface (MDI) applications.
			--
			-- Declared in Windows as COLOR_APPWORKSPACE
			-- (from WEL_COLOR_CONSTANTS)

	Color_background: INTEGER_32 = 1
			-- Desktop.
			--
			-- Declared in Windows as COLOR_BACKGROUND
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_desktop`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_btnface: INTEGER_32 = 15
			-- Face color for three-dimensional display elements and
			-- for dialog box backgrounds.
			--
			-- Declared in Windows as COLOR_3DFACE
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_3dface`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_btnhighlight: INTEGER_32 = 20
			-- Highlight color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DHILIGHT
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_3dhilight`, `color_3dhighlight` and `color_btnhilight`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_btnhilight: INTEGER_32 = 20
			-- Highlight color for three-dimensional display elements
			-- (for edges facing the light source.)
			--
			-- Declared in Windows as COLOR_3DHILIGHT
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_3dhilight`, `color_3dhighlight` and `color_btnhighlight`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_btnshadow: INTEGER_32 = 16
			-- Shadow color for three-dimensional display elements
			-- (for edges facing away from the light source).
			--
			-- Declared in Windows as COLOR_3DSHADOW
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_3dshadow`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_btntext: INTEGER_32 = 18
			-- Text on push buttons.
			--
			-- Declared in Windows as COLOR_BTNTEXT
			-- (from WEL_COLOR_CONSTANTS)

	Color_captiontext: INTEGER_32 = 9
			-- Text in caption, size box, and scroll bar arrow box.
			--
			-- Declared in Windows as COLOR_CAPTIONTEXT
			-- (from WEL_COLOR_CONSTANTS)

	Color_desktop: INTEGER_32 = 1
			-- Desktop.
			--
			-- Declared in Windows as COLOR_BACKGROUND
			-- Was declared in {WEL_COLOR_CONSTANTS} as synonym of `color_background`.
			-- (from WEL_COLOR_CONSTANTS)

	Color_gradientactivecaption: INTEGER_32 = 27
			-- Windows 98/Me, Windows 2000 or later:
			--   Right side color in the color gradient of an active window's
			--   title bar. COLOR_ACTIVECAPTION specifies the left side color.
			--   Use SPI_GETGRADIENTCAPTIONS with the SystemParametersInfo
			--   function to determine whether the gradient effect is enabled.
			--
			-- Declared in Windows as COLOR_GRADIENTACTIVECAPTION
			-- (from WEL_COLOR_CONSTANTS)

	Color_gradientinactivecaption: INTEGER_32 = 28
			-- Windows 98/Me, Windows 2000 or later:
			--   Right side color in the color gradient of an inactive window's
			--   title bar. COLOR_INACTIVECAPTION specifies the left side color.
			--
			-- Declared in Windows as COLOR_GRADIENTINACTIVECAPTION
			-- (from WEL_COLOR_CONSTANTS)

	Color_graytext: INTEGER_32 = 17
			-- Grayed (disabled) text. This color is set to 0 if the current
			-- display driver does not support a solid gray color.
			--
			-- Declared in Windows as COLOR_GRAYTEXT
			-- (from WEL_COLOR_CONSTANTS)

	Color_highlight: INTEGER_32 = 13
			-- Item(s) selected in a control.
			--
			-- Declared in Windows as COLOR_HIGHLIGHT
			-- (from WEL_COLOR_CONSTANTS)

	Color_highlighttext: INTEGER_32 = 14
			-- Text of item(s) selected in a control.
			--
			-- Declared in Windows as COLOR_HIGHLIGHTTEXT
			-- (from WEL_COLOR_CONSTANTS)

	Color_hotlight: INTEGER_32 = 26
			-- Windows 98/Me, Windows 2000 or later:
			--   Color for a hot-tracked item. Single clicking a hot-tracked
			--   item executes the item.
			--
			-- Declared in Windows as COLOR_HOTLIGHT
			-- (from WEL_COLOR_CONSTANTS)

	Color_inactiveborder: INTEGER_32 = 11
			-- Inactive window border.
			--
			-- Declared in Windows as COLOR_INACTIVEBORDER
			-- (from WEL_COLOR_CONSTANTS)

	Color_inactivecaption: INTEGER_32 = 3
			-- Inactive window caption. 
			--
			-- Windows 98/Me, Windows 2000 or later:
			--   Specifies the left side color in the color gradient of an inactive
			--   window's title bar if the gradient effect is enabled.
			--
			-- Declared in Windows as COLOR_INACTIVECAPTION
			-- (from WEL_COLOR_CONSTANTS)

	Color_inactivecaptiontext: INTEGER_32 = 19
			-- Color of text in an inactive caption.
			--
			-- Declared in Windows as COLOR_INACTIVECAPTIONTEXT
			-- (from WEL_COLOR_CONSTANTS)

	Color_infobk: INTEGER_32 = 24
			-- Background color for tooltip controls.
			--
			-- Declared in Windows as COLOR_INFOBK
			-- (from WEL_COLOR_CONSTANTS)

	Color_infotext: INTEGER_32 = 23
			-- Text color for tooltip controls.
			--
			-- Declared in Windows as COLOR_INFOTEXT
			-- (from WEL_COLOR_CONSTANTS)

	Color_menu: INTEGER_32 = 4
			-- Menu background.
			--
			-- Declared in Windows as COLOR_MENU
			-- (from WEL_COLOR_CONSTANTS)

	Color_menubar: INTEGER_32 = 30
			-- Windows XP:
			--   The background color for the menu bar when menus appear as 
			--   flat menus (see SystemParametersInfo). However, `color_menu`
			--   continues to specify the background color of the menu popup.
			--
			-- Declared in Windows as COLOR_MENUBAR
			-- (from WEL_COLOR_CONSTANTS)

	Color_menuhilight: INTEGER_32 = 29
			-- Windows XP:
			--   The color used to highlight menu items when the menu appears
			--   as a flat menu (see SystemParametersInfo). The highlighted
			--   menu item is outlined with COLOR_HIGHLIGHT.
			--
			-- Declared in Windows as COLOR_MENUHILIGHT
			-- (from WEL_COLOR_CONSTANTS)

	Color_menutext: INTEGER_32 = 7
			-- Text in menus.
			--
			-- Declared in Windows as COLOR_MENUTEXT
			-- (from WEL_COLOR_CONSTANTS)

	Color_resolution: INTEGER_32 = 108
			-- Color resolution of the device in bits
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Color_scrollbar: INTEGER_32 = 0
			-- Scroll bar gray area.
			--
			-- Declared in Windows as COLOR_SCROLLBAR
			-- (from WEL_COLOR_CONSTANTS)

	Color_window: INTEGER_32 = 5
			-- Window background.
			--
			-- Declared in Windows as COLOR_WINDOW
			-- (from WEL_COLOR_CONSTANTS)

	Color_windowframe: INTEGER_32 = 6
			-- Window frame.
			--
			-- Declared in Windows as COLOR_WINDOWFRAME
			-- (from WEL_COLOR_CONSTANTS)

	Color_windowtext: INTEGER_32 = 8
			-- Text in windows.
			--
			-- Declared in Windows as COLOR_WINDOWTEXT
			-- (from WEL_COLOR_CONSTANTS)

	Com_exception: INTEGER_32 = 28
			-- Exception code for a COM error.
			-- (from EXCEP_CONST)

	cosine (v: REAL_32): REAL_32
			-- Trigonometric cosine of radian v approximated
			-- in the range [-pi/4, +pi/4]
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	Create_on_deferred: INTEGER_32 = 17
			-- Create on deferred
			-- (from EXCEP_CONST)

	Curve_caps: INTEGER_32 = 28
			-- See class WEL_CURVE_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	dashed_line_style: BOOLEAN
			-- Are lines drawn dashed?
			-- (from EV_DRAWABLE_IMP)

	dc: WEL_SCREEN_DC
			-- DC for drawing.

	Developer_exception: INTEGER_32 = 24
			-- Exception code for developer exception
			-- (from EXCEP_CONST)

	Dib_pal_colors: INTEGER_32 = 1
			-- (from WEL_DIB_COLORS_CONSTANTS)

	Dib_rgb_colors: INTEGER_32 = 0
			-- (from WEL_DIB_COLORS_CONSTANTS)

	Dollar_applied_to_melted_feature: INTEGER_32 = 26
			-- $ applied to melted feature
			-- (from EXCEP_CONST)

	drawing_mode: INTEGER_32
			-- Logical operation on pixels when drawing.
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True

	Driver_version: INTEGER_32 = 1
			-- Version number of the device driver
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Dstinvert: INTEGER_32 = 5570569
			-- Declared in Windows as DSTINVERT
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Dt_bottom: INTEGER_32 = 8
			-- Declared in Windows as DT_BOTTOM
			-- (from WEL_DT_CONSTANTS)

	Dt_calcrect: INTEGER_32 = 1024
			-- Declared in Windows as DT_CALCRECT
			-- (from WEL_DT_CONSTANTS)

	Dt_center: INTEGER_32 = 1
			-- Declared in Windows as DT_CENTER
			-- (from WEL_DT_CONSTANTS)

	Dt_expandtabs: INTEGER_32 = 64
			-- Declared in Windows as DT_EXPANDTABS
			-- (from WEL_DT_CONSTANTS)

	Dt_externalleading: INTEGER_32 = 512
			-- Declared in Windows as DT_EXTERNALLEADING
			-- (from WEL_DT_CONSTANTS)

	Dt_hideprefix: INTEGER_32 = 1048576
			-- Declared in Windows as DT_HIDEPREFIX
			-- (from WEL_DT_CONSTANTS)

	Dt_internal: INTEGER_32 = 4096
			-- Declared in Windows as DT_INTERNAL
			-- (from WEL_DT_CONSTANTS)

	Dt_left: INTEGER_32 = 0
			-- Declared in Windows as DT_LEFT
			-- (from WEL_DT_CONSTANTS)

	Dt_noclip: INTEGER_32 = 256
			-- Declared in Windows as DT_NOCLIP
			-- (from WEL_DT_CONSTANTS)

	Dt_noprefix: INTEGER_32 = 2048
			-- Declared in Windows as DT_NOPREFIX
			-- (from WEL_DT_CONSTANTS)

	Dt_right: INTEGER_32 = 2
			-- Declared in Windows as DT_RIGHT
			-- (from WEL_DT_CONSTANTS)

	Dt_singleline: INTEGER_32 = 32
			-- Declared in Windows as DT_SINGLELINE
			-- (from WEL_DT_CONSTANTS)

	Dt_tabstop: INTEGER_32 = 128
			-- Declared in Windows as DT_TABSTOP
			-- (from WEL_DT_CONSTANTS)

	Dt_top: INTEGER_32 = 0
			-- Declared in Windows as DT_TOP
			-- (from WEL_DT_CONSTANTS)

	Dt_vcenter: INTEGER_32 = 4
			-- Declared in Windows as DT_VCENTER
			-- (from WEL_DT_CONSTANTS)

	Dt_word_ellipsis: INTEGER_32 = 262144
			-- Declared in Windows as DT_WORD_ELLIPSIS
			-- (from WEL_DT_CONSTANTS)

	Dt_wordbreak: INTEGER_32 = 16
			-- Declared in Windows as DT_WORDBREAK
			-- (from WEL_DT_CONSTANTS)

	Eiffel_runtime_fatal_error: INTEGER_32 = 25
			-- Eiffel run-time fatal error
			-- (from EXCEP_CONST)

	Eiffel_runtime_panic: INTEGER_32 = 13
			-- Eiffel run-time panic
			-- (from EXCEP_CONST)

	Euler: REAL_64 = 2.7182818284590452353602874713526625
			-- Logarithm base
			-- (from MATH_CONST)

	Exception_in_signal_handler: INTEGER_32 = 20
			-- Exception in signal handler
			-- (from EXCEP_CONST)

	Exception_manager: EXCEPTION_MANAGER
			-- Exception manager
			-- (from EXCEPTION_MANAGER_FACTORY)
		ensure -- from EXCEPTION_MANAGER_FACTORY
			instance_free: class
			exception_manager_not_void: Result /= Void

	exp (x: REAL_32): REAL_32
			-- Exponential of v.
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	External_exception: INTEGER_32 = 18
			-- Exception code for operating system error
			-- which does not set the errno variable
			-- (Unix-specific)
			-- (from EXCEP_CONST)

	Floating_point_exception: INTEGER_32 = 5
			-- Exception code for floating point exception
			-- (from EXCEP_CONST)

	floor (v: REAL_32): REAL_32
			-- Greatest integral value less than or equal to v
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	font: EV_FONT
			-- Font of Current.
			-- (from EV_FONTABLE_IMP)
		require -- from  EV_FONTABLE_I
			True
		ensure -- from EV_FONTABLE_I
			not_void: Result /= Void

	frozen foreground_color: EV_COLOR
			-- Color of foreground features like text.
			-- (from EV_COLORIZABLE_I)

	foreground_color_internal: detachable EV_COLOR
			-- Color used for lines and text.
			-- (from EV_DRAWABLE_IMP)

	generating_type: TYPE [detachable EV_SCREEN_IMP]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		ensure -- from ANY
			generating_type_not_void: Result /= Void

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty

	Gwl_exstyle: INTEGER_32 = -20
			-- (from WEL_GWL_CONSTANTS)

	Gwl_style: INTEGER_32 = -16
			-- (from WEL_GWL_CONSTANTS)

	Himetric_per_inch: INTEGER_32 = 2540
			-- Defined as HIMETRIC_PER_INCH in AtlWin.h
			-- (from WEL_UNIT_CONVERSION)

	Wel_horizontal_resolution: INTEGER_32 = 8
			-- Width of the display, in pixels
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Horizontal_size: INTEGER_32 = 4
			-- Width of the physical display in millimeters
			-- (from WEL_CAPABILITIES_CONSTANTS)

	hs_bdiagonal: INTEGER_32
			-- (from WEL_HS_CONSTANTS)

	hs_cross: INTEGER_32
			-- (from WEL_HS_CONSTANTS)

	hs_diagcross: INTEGER_32
			-- (from WEL_HS_CONSTANTS)

	hs_fdiagonal: INTEGER_32
			-- (from WEL_HS_CONSTANTS)

	hs_horizontal: INTEGER_32
			-- (from WEL_HS_CONSTANTS)

	hs_vertical: INTEGER_32
			-- (from WEL_HS_CONSTANTS)

	Incorrect_inspect_value: INTEGER_32 = 9
			-- Exception code for inspect value which is not one
			-- of the inspect constants, if there is no Else_part
			-- (from EXCEP_CONST)

	internal_font: EV_FONT
			-- Font of Current for internal queries.
			-- Faster than calling `font` as we do not need to
			-- create a new EV_FONT every time.
			-- (from EV_FONTABLE_IMP)

	internal_font_height: INTEGER_32
			-- Height required to correctly display font of Current in pixels.
			-- (from EV_FONTABLE_IMP)
		ensure -- from EV_FONTABLE_IMP
			result_non_negative: Result >= 0

	Io_exception: INTEGER_32 = 21
			-- Exception code for I/O error
			-- (from EXCEP_CONST)

	Line_caps: INTEGER_32 = 30
			-- See class WEL_LINE_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	line_width: INTEGER_32
			-- Line thickness.
			-- (from EV_DRAWABLE_IMP)

	log (v: REAL_32): REAL_32
			-- Natural logarithm of v
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	log10 (v: REAL_32): REAL_32
			-- Base 10 logarithm of v
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	log_2 (v: REAL_32): REAL_32
			-- Base 2 logarithm of v
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	Logical_pixels_x: INTEGER_32 = 88
			-- Number of pixels per logical inch along
			-- the display width
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Logical_pixels_y: INTEGER_32 = 90
			-- Number of pixels per logical inch along
			-- the display height
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Loop_invariant: INTEGER_32 = 11
			-- Exception code for violated loop invariant
			-- (from EXCEP_CONST)

	Loop_variant: INTEGER_32 = 10
			-- Exception code for non-decreased loop variant
			-- (from EXCEP_CONST)

	frozen maskcopy: INTEGER_32
			-- Use SRCCOPY for foreground and R2_NOOP for background.
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)
		ensure -- from WEL_RASTER_OPERATIONS_CONSTANTS
			is_class: class

	Maskpaint: INTEGER_32 = 2229030
			-- 0x220326
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Maximum_buffered_string_size: INTEGER_32 = 10000
			-- Maximum size of string permitting a shared WEL_STRING object to
			-- be returned by `wel_string_restricted`.
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)

	Mb_abortretryignore: INTEGER_32 = 2
			-- (from WEL_MB_CONSTANTS)

	Mb_applmodal: INTEGER_32 = 0
			-- (from WEL_MB_CONSTANTS)

	Mb_default_desktop_only: INTEGER_32 = 131072
			-- (from WEL_MB_CONSTANTS)

	Mb_defbutton1: INTEGER_32 = 0
			-- (from WEL_MB_CONSTANTS)

	Mb_defbutton2: INTEGER_32 = 256
			-- (from WEL_MB_CONSTANTS)

	Mb_defbutton3: INTEGER_32 = 512
			-- (from WEL_MB_CONSTANTS)

	Mb_defmask: INTEGER_32 = 3840
			-- (from WEL_MB_CONSTANTS)

	Mb_help: INTEGER_32 = 16384
			-- (from WEL_MB_CONSTANTS)

	Mb_iconasterisk: INTEGER_32 = 64
			-- (from WEL_MB_CONSTANTS)

	Mb_iconerror: INTEGER_32 = 16
			-- Same as `mb_iconhand`.
			-- (from WEL_MB_CONSTANTS)

	Mb_iconexclamation: INTEGER_32 = 48
			-- (from WEL_MB_CONSTANTS)

	Mb_iconhand: INTEGER_32 = 16
			-- (from WEL_MB_CONSTANTS)

	Mb_iconinformation: INTEGER_32 = 64
			-- Same as `mb_iconasterisk`.
			-- (from WEL_MB_CONSTANTS)

	Mb_iconmask: INTEGER_32 = 240
			-- (from WEL_MB_CONSTANTS)

	Mb_iconquestion: INTEGER_32 = 32
			-- (from WEL_MB_CONSTANTS)

	Mb_iconstop: INTEGER_32 = 16
			-- Same as `mb_iconhand`.
			-- (from WEL_MB_CONSTANTS)

	Mb_iconwarning: INTEGER_32 = 48
			-- Same as `mb_iconexclamation`.
			-- (from WEL_MB_CONSTANTS)

	Mb_nofocus: INTEGER_32 = 32768
			-- (from WEL_MB_CONSTANTS)

	Mb_ok: INTEGER_32 = 0
			-- (from WEL_MB_CONSTANTS)

	Mb_okcancel: INTEGER_32 = 1
			-- (from WEL_MB_CONSTANTS)

	Mb_retrycancel: INTEGER_32 = 5
			-- (from WEL_MB_CONSTANTS)

	Mb_right: INTEGER_32 = 524288
			-- (from WEL_MB_CONSTANTS)

	Mb_rtlreading: INTEGER_32 = 1048576
			-- (from WEL_MB_CONSTANTS)

	Mb_setforeground: INTEGER_32 = 65536
			-- (from WEL_MB_CONSTANTS)

	Mb_systemmodal: INTEGER_32 = 4096
			-- (from WEL_MB_CONSTANTS)

	Mb_taskmodal: INTEGER_32 = 8192
			-- (from WEL_MB_CONSTANTS)

	Mb_topmost: INTEGER_32 = 262144
			-- (from WEL_MB_CONSTANTS)

	Mb_typemask: INTEGER_32 = 15
			-- (from WEL_MB_CONSTANTS)

	Mb_usericon: INTEGER_32 = 128
			-- (from WEL_MB_CONSTANTS)

	Mb_yesno: INTEGER_32 = 4
			-- (from WEL_MB_CONSTANTS)

	Mb_yesnocancel: INTEGER_32 = 3
			-- (from WEL_MB_CONSTANTS)

	Mergecopy: INTEGER_32 = 12583114
			-- Declared in Windows as MERGECOPY
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Mergepaint: INTEGER_32 = 12255782
			-- Declared in Windows as MERGEPAINT
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	No_more_memory: INTEGER_32 = 2
			-- Exception code for failed memory allocation
			-- (from EXCEP_CONST)

	Notsrccopy: INTEGER_32 = 3342344
			-- Declared in Windows as NOTSRCCOPY
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Notsrcerase: INTEGER_32 = 1114278
			-- Declared in Windows as NOTSRCERASE
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Num_brushes: INTEGER_32 = 16
			-- Number of device-specific brushes
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_colors: INTEGER_32 = 24
			-- Number of entries in the device's color table
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_fonts: INTEGER_32 = 22
			-- Number of device-specific fonts
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_markers: INTEGER_32 = 20
			-- Number of device-specific markers
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_pens: INTEGER_32 = 18
			-- Number of device-specific pens
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_reserved: INTEGER_32 = 106
			-- Number of reserved entries in the system palette
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Number_of_codes: INTEGER_32 = 31
			-- How many codes are there to represent exceptions?
			-- (from EXCEP_CONST)

	Old_exception: INTEGER_32 = 30
			-- Old exception code.
			-- (from EXCEP_CONST)

	Operating_system_exception: INTEGER_32 = 22
			-- Exception code for operating system error
			-- which sets the errno variable
			-- (Unix-specific)
			-- (from EXCEP_CONST)

	Out_of_memory: INTEGER_32 = 15
			-- Out of memory (cannot be ignored)
			-- (from EXCEP_CONST)

	Patcopy: INTEGER_32 = 15728673
			-- Declared in Windows as PATCOPY
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Patinvert: INTEGER_32 = 5898313
			-- Declared in Windows as PATINVERT
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Patpaint: INTEGER_32 = 16452105
			-- Declared in Windows as PATPAINT
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Pdevice_size: INTEGER_32 = 26
			-- Size of the PDEVICE internal structure, in bytes
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Physical_offset_x: INTEGER_32 = 112
			-- Distance from left edge of the printable area, in
			-- device units.
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Physical_offset_y: INTEGER_32 = 113
			-- Distance from top edge of the printable area, in
			-- device units.
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Pi: REAL_64 = 3.1415926535897932384626433832795029
			-- (from MATH_CONST)

	Pi_2: REAL_64 = 1.5707963267948966192313216916397514
			-- (from MATH_CONST)

	Pi_4: REAL_64 = 0.7853981633974483096156608458198757
			-- (from MATH_CONST)

	Planes: INTEGER_32 = 14
			-- Number of color planes
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Polygonal_caps: INTEGER_32 = 32
			-- See class WEL_POLYGONAL_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Postcondition: INTEGER_32 = 4
			-- Exception code for violated postcondition
			-- (from EXCEP_CONST)

	Precondition: INTEGER_32 = 3
			-- Exception code for violated precondition
			-- (from EXCEP_CONST)

	R2_black: INTEGER_32 = 1
			-- (from WEL_ROP2_CONSTANTS)

	R2_copypen: INTEGER_32 = 13
			-- (from WEL_ROP2_CONSTANTS)

	R2_masknotpen: INTEGER_32 = 3
			-- (from WEL_ROP2_CONSTANTS)

	R2_maskpen: INTEGER_32 = 9
			-- (from WEL_ROP2_CONSTANTS)

	R2_maskpennot: INTEGER_32 = 5
			-- (from WEL_ROP2_CONSTANTS)

	R2_mergenotpen: INTEGER_32 = 12
			-- (from WEL_ROP2_CONSTANTS)

	R2_mergepen: INTEGER_32 = 15
			-- (from WEL_ROP2_CONSTANTS)

	R2_mergepennot: INTEGER_32 = 14
			-- (from WEL_ROP2_CONSTANTS)

	R2_nop: INTEGER_32 = 11
			-- (from WEL_ROP2_CONSTANTS)

	R2_not: INTEGER_32 = 6
			-- (from WEL_ROP2_CONSTANTS)

	R2_notcopypen: INTEGER_32 = 4
			-- (from WEL_ROP2_CONSTANTS)

	R2_notmaskpen: INTEGER_32 = 8
			-- (from WEL_ROP2_CONSTANTS)

	R2_notmergepen: INTEGER_32 = 2
			-- (from WEL_ROP2_CONSTANTS)

	R2_notxorpen: INTEGER_32 = 10
			-- (from WEL_ROP2_CONSTANTS)

	R2_white: INTEGER_32 = 16
			-- (from WEL_ROP2_CONSTANTS)

	R2_xorpen: INTEGER_32 = 7
			-- (from WEL_ROP2_CONSTANTS)

	rabs (v: REAL_32): REAL_32
			-- Absolute value of v
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	Raster_caps: INTEGER_32 = 38
			-- See class WEL_RASTER_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Rescue_exception: INTEGER_32 = 14
			-- Exception code for exception in rescue clause
			-- (from EXCEP_CONST)

	Resumption_failed: INTEGER_32 = 16
			-- Resumption failed (retry did not succeed)
			-- (from EXCEP_CONST)

	Retrieve_exception: INTEGER_32 = 23
			-- Exception code for retrieval error
			-- may be raised by retrieved in IO_MEDIUM.
			-- (from EXCEP_CONST)

	Routine_failure: INTEGER_32 = 8
			-- Exception code for failed routine
			-- (from EXCEP_CONST)

	Runtime_check_exception: INTEGER_32 = 29
			-- Exception code for runtime check being violated.
			-- (from EXCEP_CONST)

	Runtime_io_exception: INTEGER_32 = 27
			-- Exception code for I/O error raised by runtime functions
			-- such as store/retrieve, file access...
			-- (from EXCEP_CONST)

	Scaling_factor_x: INTEGER_32 = 114
			-- Scaling factor for the x-axis of the printer.
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Scaling_factor_y: INTEGER_32 = 115
			-- Scaling factor for the y-axis of the printer.
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Serialization_exception: INTEGER_32 = 31
			-- Serialization exception code.
			-- (from EXCEP_CONST)

	Signal_exception: INTEGER_32 = 12
			-- Exception code for operating system signal
			-- (from EXCEP_CONST)

	sine (v: REAL_32): REAL_32
			-- Trigonometric sine of radian v approximated
			-- in range [-pi/4, +pi/4]
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	Size_palette: INTEGER_32 = 104
			-- Number of entries in the system palette
			-- (from WEL_CAPABILITIES_CONSTANTS)

	sqrt (v: REAL_32): REAL_32
			-- Square root of v
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	Sqrt2: REAL_64 = 1.4142135623730950488016887242096981
			-- Square root of 2
			-- (from MATH_CONST)

	Srcand: INTEGER_32 = 8913094
			-- Declared in Windows as SRCAND
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Srccopy: INTEGER_32 = 13369376
			-- Declared in Windows as SRCCOPY
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Srcerase: INTEGER_32 = 4457256
			-- Declared in Windows as SRCERASE
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Srcinvert: INTEGER_32 = 6684742
			-- Declared in Windows as SRCINVERT
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	Srcpaint: INTEGER_32 = 15597702
			-- Declared in Windows as SRCPAINT
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)

	sub_pixmap (area: EV_RECTANGLE): EV_PIXMAP
			-- Return the subpixmap of Current described by rectangle area.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			area_not_void: area /= Void
		ensure -- from EV_DRAWABLE_I
			result_not_void: Result /= Void

	ta_baseline: INTEGER_32
			-- The reference point is on the base line of the text.
			-- (from WEL_TA_CONSTANTS)

	ta_bottom: INTEGER_32
			-- The reference point is on the bottom edge of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_center: INTEGER_32
			-- The reference point is aligned horizontally with the center of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_left: INTEGER_32
			-- The reference point is on the left edge of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_noupdatecp: INTEGER_32
			-- The current position is not updated after each text output call.
			-- (from WEL_TA_CONSTANTS)

	ta_right: INTEGER_32
			-- The reference point is on the right edge of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_top: INTEGER_32
			-- The reference point is on the top edge of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_updatecp: INTEGER_32
			-- The current position is updated after each text output call.
			-- (from WEL_TA_CONSTANTS)

	tangent (v: REAL_32): REAL_32
			-- Trigonometric tangent of radian v approximated
			-- in range [-pi/4, +pi/4]
			-- (from SINGLE_MATH)
		ensure -- from SINGLE_MATH
			instance_free: class

	Technology: INTEGER_32 = 2
			-- Device technology.
			-- See class WEL_DEVICE_TECHNOLOGY_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Text_caps: INTEGER_32 = 34
			-- See class WEL_TEXT_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	tile: detachable EV_PIXMAP
			-- Pixmap that is used to instead of background_color.
			-- If set to Void, `background_color` is used to fill.
			-- (from EV_DRAWABLE_IMP)

	valid_code (c: INTEGER_32): BOOLEAN
			-- Is c a valid code to represent some kind of exceptions?
			-- (from EXCEP_CONST)

	Wel_vertical_resolution: INTEGER_32 = 10
			-- Height of the display, in raster lines
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Vertical_size: INTEGER_32 = 6
			-- Height of the physical display in millimeters
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Void_assigned_to_expanded: INTEGER_32 = 19
			-- Exception code for assignment of void value
			-- to expanded entity
			-- (from EXCEP_CONST)

	Void_call_target: INTEGER_32 = 1
			-- Exception code for feature applied to void reference
			-- (from EXCEP_CONST)

	Wel_rect: WEL_RECT
			-- Once access to an object of type WEL_RECT
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)

	Wel_string: WEL_STRING
			-- Once access to an object of type WEL_STRING
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)

	wel_string_from_string (s: READABLE_STRING_GENERAL): WEL_STRING
			-- Return a shared wel string set to s if
			-- s.count < `maximum_buffered_string_size`, otherwise
			-- return a new WEL_STRING object set to s.
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)
		require -- from WEL_SHARED_TEMPORARY_OBJECTS
			s_not_void: s /= Void

	wel_string_from_string_with_newline_conversion (s: READABLE_STRING_GENERAL): WEL_STRING
			-- Return a shared wel string set to s if
			-- s.count < `maximum_buffered_string_size`, otherwise
			-- return a new WEL_STRING object set to s.
			-- Make sure all lone '%N' characters are prepended with a carriage return '%R'.
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)
		require -- from WEL_SHARED_TEMPORARY_OBJECTS
			s_not_void: s /= Void

	wel_string_restricted (characters: INTEGER_32): WEL_STRING
			-- Return shared `wel_string` as Result if characters
			-- is less than `maximum_buffered_string_size`, otherwise return a
			-- new WEL_STRING object. This is used to prevent huge strings
			-- from being kept within a system.
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)

	Whiteness: INTEGER_32 = 16711778
			-- Declared in Windows as WHITENESS
			-- (from WEL_RASTER_OPERATIONS_CONSTANTS)
	
feature -- Measurement

	height: INTEGER_32
			-- Height of Current.
		require -- from  EV_DRAWABLE_I
			True
		ensure -- from EV_DRAWABLE_I
			positive: Result > 0

	horizontal_resolution: INTEGER_32
			-- Number of pixels per inch along screen width.
		ensure -- from EV_SCREEN_I
			positive: Result > 0

	monitor_count: INTEGER_32
			-- Number of monitors used for displaying the screen.

	redraw
			-- Force screen to redraw itself.

	vertical_resolution: INTEGER_32
			-- Number of pixels per inch along screen height.
		ensure -- from EV_SCREEN_I
			positive: Result > 0

	virtual_height: INTEGER_32
			-- Virtual height of Current

	virtual_width: INTEGER_32
			-- Virtual width of Current

	virtual_x: INTEGER_32
			-- X position of virtual screen in main display coordinates

	virtual_y: INTEGER_32
			-- Y position of virtual screen in main display coordinates

	width: INTEGER_32
			-- Width of Current.
		require -- from  EV_DRAWABLE_I
			True
		ensure -- from EV_DRAWABLE_I
			positive: Result > 0
	
feature -- Comparison

	frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			shallow_implies_deep: standard_equal (a, b) implies Result
			both_or_none_void: (a = Void) implies (Result = (b = Void))
			same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b))
			symmetric: Result implies deep_equal (b, a)

	frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b))

	frozen is_deep_equal alias "≡≡≡" (other: EV_SCREEN_IMP): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			shallow_implies_deep: standard_is_equal (other) implies Result
			same_type: Result implies same_type (other)
			symmetric: Result implies other.is_deep_equal (Current)

	is_equal (other: EV_SCREEN_IMP): BOOLEAN
			-- Is other attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result

	frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached to
			-- field-by-field identical objects of the same type?
			-- Always uses default object comparison criterion.
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b))

	frozen standard_is_equal alias "≜" (other: EV_SCREEN_IMP): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object, and field-by-field identical to it?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
	
feature -- Status report

	assertion_violation: BOOLEAN
			-- Is last exception originally due to a violated
			-- assertion or non-decreasing variant?
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	exception_class_name: detachable STRING_8
			-- Name of the class that includes the recipient
			-- of original form of last exception
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	conforms_to (other: ANY): BOOLEAN
			-- Does type of current object conform to type
			-- of other (as per Eiffel: The Language, chapter 13)?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void

	destroyed: BOOLEAN
			-- Is Current destroyed?

	developer_exception_name: detachable STRING_8
			-- Name of last developer-raised exception
			-- (from EXCEPTIONS)
		require -- from EXCEPTIONS
			applicable: is_developer_exception
		ensure -- from EXCEPTIONS
			instance_free: class

	exception: INTEGER_32
			-- Code of last exception that occurred
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	exception_trace: detachable STRING_8
			-- String representation of the exception trace
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	foreground_window: detachable WEL_WINDOW
			-- Foreground window (window with focus)
			-- (from WEL_WINDOWS_ROUTINES)

	is_destroyed: BOOLEAN
			-- Is Current no longer usable?
			-- (from EV_ANY_I)

	is_developer_exception: BOOLEAN
			-- Is the last exception originally due to
			-- a developer exception?
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	is_developer_exception_of_name (name: detachable STRING_8): BOOLEAN
			-- Is the last exception originally due to a developer
			-- exception of name name?
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	is_signal: BOOLEAN
			-- Is last exception originally due to an external
			-- event (operating system signal)?
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	is_system_exception: BOOLEAN
			-- Is last exception originally due to an
			-- external event (operating system error)?
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	is_terminal_service: BOOLEAN
			-- If window in terminal service (Remote Desktop)?
			-- (from WEL_WINDOWS_ROUTINES)
		require -- from WEL_WINDOWS_ROUTINES
			after_2000: (create {WEL_WINDOWS_VERSION} end).is_windows_2000_compatible

	is_window (hwnd: POINTER): BOOLEAN
			-- Does hwnd point to a valid Window?
			-- (from WEL_WINDOWS_ROUTINES)

	key_down (virtual_key: INTEGER_32): BOOLEAN
			--Is 'virtual' key pressed
			-- (from WEL_WINDOWS_ROUTINES)

	key_locked (virtual_key: INTEGER_32): BOOLEAN
			--Is 'virtual' key locked
			-- (from WEL_WINDOWS_ROUTINES)

	key_to_string (key_data: INTEGER_32): STRING_32
			-- Give the string associated with the key given by
			-- virtual_key.
			-- (from WEL_WINDOWS_ROUTINES)

	meaning (except: INTEGER_32): detachable STRING_8
			-- A message in English describing what except is
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	monitor_area_from_position (a_x, a_y: INTEGER_32): EV_RECTANGLE
			-- Full area of monitor nearest to coordinates (a_x, a_y)
		require -- from EV_SCREEN_I
			not_destroyed: not is_destroyed

	monitor_area_from_window (a_window: EV_WINDOW): EV_RECTANGLE
			-- Full area of monitor of which most of a_window is located.
			-- Returns nearest monitor area if a_window does not overlap any monitors.
		require -- from EV_SCREEN_I
			not_destroyed: not is_destroyed
			not_window_destroyed: not a_window.is_destroyed

	Monitor_defaulttonearest: INTEGER_32 = 2
			-- Win32 API Monitor default return constant values.

	Monitor_defaulttonull: INTEGER_32 = 0

	Monitor_defaulttoprimary: INTEGER_32 = 1

	original_class_name: detachable STRING_8
			-- Name of the class that includes the recipient
			-- of original form of last exception
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	original_exception: INTEGER_32
			-- Original code of last exception that triggered
			-- current exception
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	original_recipient_name: detachable STRING_8
			-- Name of the routine whose execution was
			-- interrupted by original form of last exception
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	original_tag_name: detachable STRING_8
			-- Assertion tag for original form of last
			-- assertion violation.
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	pointer_position: EV_COORDINATE
			-- Position of the screen pointer.

	recipient_name: detachable STRING_8
			-- Name of the routine whose execution was
			-- interrupted by last exception
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	same_type (other: ANY): BOOLEAN
			-- Is type of current object identical to type of other?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))

	system_directory: STRING_32
			-- Path of the Windows system directory
			-- (from WEL_WINDOWS_ROUTINES)
		ensure -- from WEL_WINDOWS_ROUTINES
			result_not_void: Result /= Void

	tag_name: detachable STRING_8
			-- Tag of last violated assertion clause
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	tick_count: INTEGER_32
			-- Number of milliseconds that have
			-- elapsed since Windows was started.
			-- (from WEL_WINDOWS_ROUTINES)
		ensure -- from WEL_WINDOWS_ROUTINES
			positive_result: Result >= 0

	valid_color_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid color constant?
			-- (from WEL_COLOR_CONSTANTS)

	valid_dib_colors_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid dib colors constant?
			-- (from WEL_DIB_COLORS_CONSTANTS)

	valid_htext_alignment_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid text alignment constant for horizontal positioning?
			-- (from WEL_TA_CONSTANTS)

	valid_rop2_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid rop2 constant?
			-- (from WEL_ROP2_CONSTANTS)

	valid_text_alignment_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid text alignment constant?
			-- (from WEL_TA_CONSTANTS)

	valid_vtext_alignment_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid text alignment constant for vertical positioning?
			-- (from WEL_TA_CONSTANTS)

	virtual_bottom: INTEGER_32
			-- Bottom position of virtual screen in main display coordinates
			-- (from EV_SCREEN_I)

	virtual_left: INTEGER_32
			-- Left position of virtual screen in main display coordinates
			-- (from EV_SCREEN_I)

	virtual_right: INTEGER_32
			-- Right position of virtual screen in main display coordinates
			-- (from EV_SCREEN_I)

	virtual_top: INTEGER_32
			-- Top position of virtual screen in main display coordinates
			-- (from EV_SCREEN_I)

	widget_at_mouse_pointer: detachable EV_WIDGET
			-- Widget at mouse pointer if any.

	widget_at_position (x, y: INTEGER_32): detachable EV_WIDGET
			-- Widget at position (x, y) if any.

	window_of_item (hwnd: POINTER): detachable WEL_WINDOW
			-- Retrieve Eiffel object associated with hwnd pointer.
			-- (from WEL_WINDOWS_ROUTINES)
		require -- from WEL_WINDOWS_ROUTINES
			hwnd_not_null: hwnd /= default_pointer
			is_window_pointer: is_window (hwnd)
		ensure -- from WEL_WINDOWS_ROUTINES
			is_wel_window: Result /= Void end implies (create {INTERNAL} end).type_conforms_to ((create {INTERNAL} end).dynamic_type (Result), (create {INTERNAL} end).dynamic_type_from_string ("WEL_WINDOW"))
			is_proper_wel_window: Result /= Void implies Result.item = hwnd

	windows_directory: STRING_32
			-- Path of the Windows directory
			-- (from WEL_WINDOWS_ROUTINES)
		ensure -- from WEL_WINDOWS_ROUTINES
			result_not_void: Result /= Void

	working_area_from_position (a_x, a_y: INTEGER_32): EV_RECTANGLE
			-- Area available for windows of monitor nearest to coordinates (a_x, a_y).
			-- E.g. it should exclude the taskbar if any.
		require -- from EV_SCREEN_I
			not_destroyed: not is_destroyed

	working_area_from_window (a_window: EV_WINDOW): EV_RECTANGLE
			-- Area available for windows of monitor of which most of a_window is located.
			-- Returns nearest working area if a_window does not overlap any monitors.
			-- E.g. it should exclude the taskbar if any.
		require -- from EV_SCREEN_I
			not_destroyed: not is_destroyed
			not_window_destroyed: not a_window.is_destroyed
	
feature -- Status setting

	catch (code: INTEGER_32)
			-- Make sure that any exception of code code will be
			-- caught. This is the default.
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	destroy
			-- Destroy actual object.
		require -- from  EV_ANY_I
			True
		ensure -- from EV_ANY_I
			is_in_destroy_set: is_in_destroy
			is_destroyed_set: is_destroyed

	die (code: INTEGER_32)
			-- Terminate execution with exit status code,
			-- without triggering an exception.
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			False
			instance_free: class

	ignore (code: INTEGER_32)
			-- Make sure that any exception of code code will be
			-- ignored. This is not the default.
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	message_on_failure
			-- Print an exception history table
			-- in case of failure.
			-- This is the default.
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	no_message_on_failure
			-- Do not print an exception history table
			-- in case of failure.
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	exception_raise (name: detachable READABLE_STRING_GENERAL)
			-- Raise a developer exception of name name.
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	raise_retrieval_exception (name: detachable READABLE_STRING_GENERAL)
			-- Raise a retrieval exception of name name.
			-- (from EXCEPTIONS)
		ensure -- from EXCEPTIONS
			instance_free: class

	set_default_font
			-- Make system to use default font.
			-- (from EV_FONTABLE_IMP)
	
feature -- Element change

	disable_dashed_line_style
			-- Draw lines solid.
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True
		ensure -- from EV_DRAWABLE_I
			dashed_line_style_disabled: is_usable implies not attached_interface.dashed_line_style

	enable_dashed_line_style
			-- Draw lines dashed.
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True
		ensure -- from EV_DRAWABLE_I
			dashed_line_style_enabled: is_usable implies attached_interface.dashed_line_style

	remove_clipping
			-- Do not apply any clipping.
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True
		ensure -- from EV_DRAWABLE_I
			clip_area_void: is_usable implies attached_interface.clip_area = Void

	remove_tile
			-- Do not apply a tile when filling.
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True
		ensure -- from EV_DRAWABLE_I
			tile_void: is_usable implies attached_interface.tile = Void

	set_background_color (a_color: EV_COLOR)
			-- Assign a_color to `background_color`.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_COLORIZABLE_I
			a_color_not_void: a_color /= Void
		ensure -- from EV_COLORIZABLE_I
			background_color_assigned: is_initialized implies background_color.is_equal (a_color)

	set_clip_area (an_area: EV_RECTANGLE)
			-- Set an area to clip to.
			-- Set to Void when no clipping should be applied.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			an_area_not_void: an_area /= Void
		ensure -- from EV_DRAWABLE_I
			clip_area_assigned: is_usable implies attached attached_interface.clip_area as l_clip_area and then an_area.is_equal (l_clip_area)

	set_clip_region (a_region: EV_REGION)
			-- Set an area to clip to.
			-- Set to Void when no clipping should be applied.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_region_not_void: a_region /= Void

	set_drawing_mode (a_mode: INTEGER_32)
			-- Set drawing mode to a_mode.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_mode_valid: valid_drawing_mode (a_mode)
		ensure -- from EV_DRAWABLE_I
			drawing_mode_assigned: is_usable implies attached_interface.drawing_mode = a_mode

	set_font (a_font: EV_FONT)
			-- Set `font` to a_font.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_FONTABLE_I
			a_font_not_void: a_font /= Void
		ensure -- from EV_FONTABLE_I
			assigned: is_usable implies font.is_equal (a_font)

	set_foreground_color (a_color: EV_COLOR)
			-- Assign a_color to `foreground_color`
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_COLORIZABLE_I
			a_color_not_void: a_color /= Void
		ensure -- from EV_COLORIZABLE_I
			foreground_color_assigned: is_initialized implies foreground_color.is_equal (a_color)

	set_line_width (a_width: INTEGER_32)
			-- Assign a_width to `line_width`.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_width_positive_or_zero: a_width >= 0
		ensure -- from EV_DRAWABLE_I
			line_width_assigned: is_usable implies attached_interface.line_width = a_width

	set_tile (a_pixmap: EV_PIXMAP)
			-- Set tile used to fill figures.
			-- Set to Void to use `background_color` to fill.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_pixmap_not_void: a_pixmap /= Void
		ensure -- from EV_DRAWABLE_I
			tile_assigned: is_usable implies attached_interface.tile /= Void
	
feature -- Duplication

	copy (other: EV_SCREEN_IMP)
			-- Update current object using fields of object attached
			-- to other, so as to yield equal objects.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		ensure -- from ANY
			is_equal: Current ~ other

	frozen deep_copy (other: EV_SCREEN_IMP)
			-- Effect equivalent to that of:
			--		`copy` (other . `deep_twin`)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)

	frozen deep_twin: EV_SCREEN_IMP
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)

	frozen standard_copy (other: EV_SCREEN_IMP)
			-- Copy every field of other onto corresponding field
			-- of current object.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)

	frozen standard_twin: EV_SCREEN_IMP
			-- New object field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)

	frozen twin: EV_SCREEN_IMP
			-- New object equal to Current
			-- `twin` calls `copy`; to change copying/twinning semantics, redefine `copy`.
			-- (from ANY)
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
	
feature -- Basic operations

	cwin_hi_word (value: POINTER): INTEGER_32
			-- SDK HIWORD
			-- (from WEL_WORD_OPERATIONS)

	cwin_lo_word (value: POINTER): INTEGER_32
			-- SDK LOWORD
			-- (from WEL_WORD_OPERATIONS)

	cwin_make_long (low, high: INTEGER_32): POINTER
			-- SDK MAKELONG
			-- (from WEL_WORD_OPERATIONS)

	cwin_make_lparam (low, high: INTEGER_32): POINTER
			-- SKD MAKELPARAM
			-- (from WEL_WORD_OPERATIONS)

	frozen default: detachable EV_SCREEN_IMP
			-- Default value of object's type
			-- (from ANY)

	frozen default_pointer: POINTER
			-- Default value of type POINTER
			-- (Avoid the need to write p.`default` for
			-- some p of type POINTER.)
			-- (from ANY)
		ensure -- from ANY
			instance_free: class

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		ensure -- from ANY
			instance_free: class

	eif_current_object_id: INTEGER_32
			-- New identifier for Current
			-- (from IDENTIFIED_ROUTINES)
		ensure -- from IDENTIFIED_ROUTINES
			eif_current_object_id: Result > 0
			inserted: eif_is_object_id_of_current (Result)

	eif_id_any_object (an_id: INTEGER_32): detachable ANY
			-- Object associated with an_id
			-- (from IDENTIFIED_ROUTINES)
		require -- from IDENTIFIED_ROUTINES
			an_id_non_negative: an_id >= 0
		ensure -- from IDENTIFIED_ROUTINES
			instance_free: class

	eif_is_object_id_of_current (an_id: INTEGER_32): BOOLEAN
			-- Is an_id the associated object ID of Current.
			-- (from IDENTIFIED_ROUTINES)
		require -- from IDENTIFIED_ROUTINES
			an_id_non_negative: an_id >= 0

	eif_object_id (an_object: ANY): INTEGER_32
			-- New identifier for an_object
			-- (from IDENTIFIED_ROUTINES)
		ensure -- from IDENTIFIED_ROUTINES
			instance_free: class
			eif_object_id_positive: Result > 0
			inserted: eif_id_any_object (Result) = an_object

	eif_object_id_free (an_id: INTEGER_32)
			-- Free the entry an_id
			-- (from IDENTIFIED_ROUTINES)
		require -- from IDENTIFIED_ROUTINES
			an_id_non_negative: an_id >= 0
		ensure -- from IDENTIFIED_ROUTINES
			instance_free: class
			removed: eif_id_any_object (an_id) = Void

	hide_cursor
			-- Hide the cursor.
			-- (from WEL_WINDOWS_ROUTINES)

	message_beep_asterisk
			-- Play the system asterisk waveform sound.
			-- (from WEL_WINDOWS_ROUTINES)

	message_beep_exclamation
			-- Play the system exclamation waveform sound.
			-- (from WEL_WINDOWS_ROUTINES)

	message_beep_hand
			-- Play the system hand waveform sound.
			-- (from WEL_WINDOWS_ROUTINES)

	message_beep_ok
			-- Play the system ok waveform sound.
			-- (from WEL_WINDOWS_ROUTINES)

	message_beep_question
			-- Play the system question waveform sound.
			-- (from WEL_WINDOWS_ROUTINES)

	output_debug_string (s: READABLE_STRING_GENERAL)
			-- Send a string s to the system debugger.
			-- (from WEL_WINDOWS_ROUTINES)
		require -- from WEL_WINDOWS_ROUTINES
			s_not_void: s /= Void

	resource_string_id (an_id: INTEGER_32): STRING_32
			-- String identified by an_id in the resource file.
			-- (from WEL_WINDOWS_ROUTINES)
		ensure -- from WEL_WINDOWS_ROUTINES
			result_not_void: Result /= Void

	set_cursor_position_absolute (x, y: INTEGER_32)
			-- Set the cursor position to x, y.
			-- (from WEL_WINDOWS_ROUTINES)

	show_cursor
			-- Show the cursor.
			-- (from WEL_WINDOWS_ROUTINES)
	
feature -- Implementation

	interface: detachable EV_SCREEN
		note
			option: stable
		require -- from  EV_ANY_I
			True

	refresh_graphics_context
			-- Refresh the graphics context in case it is no longer valid.
	
feature 

	Allocated_brushes: EV_GDI_ALLOCATED_BRUSHES
			-- (from EV_SHARED_GDI_OBJECTS)

	Allocated_pens: EV_GDI_ALLOCATED_PENS
			-- (from EV_SHARED_GDI_OBJECTS)
	
feature -- Access (Basic style constants)

	Ps_dash: INTEGER_32 = 1
			-- (from WEL_PS_CONSTANTS)

	Ps_dashdot: INTEGER_32 = 3
			-- (from WEL_PS_CONSTANTS)

	Ps_dashdotdot: INTEGER_32 = 4
			-- (from WEL_PS_CONSTANTS)

	Ps_dot: INTEGER_32 = 2
			-- (from WEL_PS_CONSTANTS)

	Ps_insideframe: INTEGER_32 = 6
			-- Mutually exclusive pen style constants.
			-- (from WEL_PS_CONSTANTS)

	Ps_null: INTEGER_32 = 5
			-- (from WEL_PS_CONSTANTS)

	Ps_solid: INTEGER_32 = 0
			-- (from WEL_PS_CONSTANTS)
	
feature -- Access (Extended Style constants for use in conjunction with {WEL_PEN}.make_from_brush)

	Ps_alternate: INTEGER_32 = 8
			-- Mutually exclusive pen style constants.
			-- (from WEL_PS_CONSTANTS)

	Ps_cosmetic: INTEGER_32 = 0
			-- (from WEL_PS_CONSTANTS)

	Ps_endcap_flat: INTEGER_32 = 512
			-- Ps_geometric style constants.
			-- (from WEL_PS_CONSTANTS)

	Ps_endcap_round: INTEGER_32 = 0
			-- (from WEL_PS_CONSTANTS)

	Ps_endcap_square: INTEGER_32 = 256
			-- (from WEL_PS_CONSTANTS)

	Ps_geometric: INTEGER_32 = 65536
			-- Brush type style constants
			-- (from WEL_PS_CONSTANTS)

	Ps_join_bevel: INTEGER_32 = 4096
			-- (from WEL_PS_CONSTANTS)

	Ps_join_miter: INTEGER_32 = 8192
			-- (from WEL_PS_CONSTANTS)

	Ps_join_round: INTEGER_32 = 0
			-- (from WEL_PS_CONSTANTS)

	Ps_userstyle: INTEGER_32 = 7
			-- (from WEL_PS_CONSTANTS)
	
feature -- Basic Operations

	himetric_to_pixel (a_size_in_himetric: WEL_SIZE): WEL_SIZE
			-- Convert himetric into pixels.
			-- (from WEL_UNIT_CONVERSION)
		require -- from WEL_UNIT_CONVERSION
			non_void_size: a_size_in_himetric /= Void
			a_size_in_himetric_exists: a_size_in_himetric.exists
		ensure -- from WEL_UNIT_CONVERSION
			non_void_result: Result /= Void

	logical_to_pixel (hdc: WEL_DC; lo: INTEGER_32): INTEGER_32
			-- Convert lo expressed in logical unit into pixel unit.
			-- (from WEL_UNIT_CONVERSION)
		require -- from WEL_UNIT_CONVERSION
			hdc_not_void: hdc /= Void
			hdc_exists: hdc.exists

	logical_to_point (hdc: WEL_DC; lo: INTEGER_32): INTEGER_32
			-- Convert a size lo expressed in logical unit into point.
			-- (from WEL_UNIT_CONVERSION)
		require -- from WEL_UNIT_CONVERSION
			hdc_not_void: hdc /= Void
			hdc_exists: hdc.exists

	map_loghim_to_pixel (x, ppli: INTEGER_32): INTEGER_32
			-- Defined as MAP_LOGHIM_TO_PIX in AtlWin.h
			-- (from WEL_UNIT_CONVERSION)

	map_pixel_to_loghim (x, ppli: INTEGER_32): INTEGER_32
			-- Defined as MAP_PIX_TO_LOGHIM in AtlWin.h
			-- (from WEL_UNIT_CONVERSION)

	pixel_to_himetric (a_size_in_pixel: WEL_SIZE): WEL_SIZE
			-- Convert pixels into himetric.
			-- (from WEL_UNIT_CONVERSION)
		require -- from WEL_UNIT_CONVERSION
			non_void_size: a_size_in_pixel /= Void
			a_size_in_pixel_exists: a_size_in_pixel.exists
		ensure -- from WEL_UNIT_CONVERSION
			non_void_result: Result /= Void

	pixel_to_logical (hdc: WEL_DC; pi: INTEGER_32): INTEGER_32
			-- Convert `pi` expressed in pixel unit into logical unit.
			-- (from WEL_UNIT_CONVERSION)
		require -- from WEL_UNIT_CONVERSION
			hdc_not_void: hdc /= Void
			hdc_exists: hdc.exists

	pixel_to_point (hdc: WEL_DC; pi: INTEGER_32): INTEGER_32
			-- Convert a size `pi` expressed in pixel into point.
			-- (from WEL_UNIT_CONVERSION)
		require -- from WEL_UNIT_CONVERSION
			hdc_not_void: hdc /= Void
			hdc_exists: hdc.exists

	point_to_logical (hdc: WEL_DC; pt, divisor: INTEGER_32): INTEGER_32
			-- Convert a size pt/divisor expressed in point into logical units.
			-- (from WEL_UNIT_CONVERSION)
		require -- from WEL_UNIT_CONVERSION
			hdc_not_void: hdc /= Void
			hdc_exists: hdc.exists

	point_to_pixel (hdc: WEL_DC; pt, divisor: INTEGER_32): INTEGER_32
			-- Convert a size pt/divisor expressed in point into pixel.
			-- (from WEL_UNIT_CONVERSION)
		require -- from WEL_UNIT_CONVERSION
			hdc_not_void: hdc /= Void
			hdc_exists: hdc.exists
	
feature -- Basic operation

	fake_key_press (a_key: EV_KEY)
			-- Simulate the user pressing a_key.

	fake_key_release (a_key: EV_KEY)
			-- Simulate the user releasing a_key.

	fake_pointer_button_press (a_button: INTEGER_32)
			-- Simulate the user pressing a a_button
			-- on the pointing device.

	fake_pointer_button_release (a_button: INTEGER_32)
			-- Simulate the user releasing a a_button
			-- on the pointing device.

	fake_pointer_wheel_down
			-- Simulate the user rotating the mouse wheel down.

	fake_pointer_wheel_up
			-- Simulate the user rotating the mouse wheel up.

	set_default_colors
			-- Set foreground and background color to their default values.

	set_pointer_position (x, y: INTEGER_32)
			-- Set `pointer_position` to (a_x,a_y).		
	
feature -- Clearing and drawing operations

	clear
			-- Erase Current with `background_color`.
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True

	clear_rectangle (x1, y1, a_width, a_height: INTEGER_32)
			-- Draw rectangle with upper-left corner on (x, y)
			-- with size a_width and a_height in `background_color`.
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True
	
feature -- Constants

	Drawing_mode_and: INTEGER_32 = 3
			-- Drawing mode where bitwise AND is performed when a
			-- pixel is drawn.
			--
			-- T\S | 0 | 1 |
			-- -------------
			--   0 | 0 | 0 |
			-- -------------
			--   1 | 0 | 1 |
			-- (from EV_DRAWABLE_CONSTANTS)

	Drawing_mode_copy: INTEGER_32 = 0
			-- Normal drawing mode.
			--
			-- T\S | 0 | 1 |
			-- -------------
			--   0 | 0 | 1 |
			-- -------------
			--   1 | 0 | 1 |
			-- (from EV_DRAWABLE_CONSTANTS)

	Drawing_mode_invert: INTEGER_32 = 2
			-- Drawing mode where bits are inverted before drawn.
			--
			-- T\S | 0 | 1 |
			-- -------------
			--   0 | 1 | 0 |
			-- -------------
			--   1 | 1 | 0 |
			-- (from EV_DRAWABLE_CONSTANTS)

	Drawing_mode_or: INTEGER_32 = 4
			-- Drawing mode where bitwise OR is performed when a
			-- pixel is drawn.
			--
			-- T\S | 0 | 1 |
			-- -------------
			--   0 | 0 | 1 |
			-- -------------
			--   1 | 1 | 1 |
			-- (from EV_DRAWABLE_CONSTANTS)

	Drawing_mode_xor: INTEGER_32 = 1
			-- Drawing mode where bitwise XOR is performed when a
			-- pixel is drawn.
			--
			-- T\S | 0 | 1 |
			-- -------------
			--   0 | 0 | 1 |
			-- -------------
			--   1 | 1 | 0 |
			-- (from EV_DRAWABLE_CONSTANTS)
	
feature -- Contract Support

	valid_extended_pen_style (c: INTEGER_32): BOOLEAN
			-- Is c a valid style constant when used in conjunction with a WEL_LOG_BRUSH.
			-- (from WEL_PS_CONSTANTS)

	valid_pen_style_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid pen style constant?
			-- Only valid for non-extended pen creation.
			-- (from WEL_PS_CONSTANTS)
	
feature -- Contract support

	valid_drawing_mode (a_mode: INTEGER_32): BOOLEAN
			-- Is a_mode a valid drawing mode?
			-- (from EV_DRAWABLE_CONSTANTS)
	
feature -- Conversion from Eiffel to Windows

	frozen to_lparam (i: INTEGER_32): POINTER
			-- Convert integer value i in a valid LPARAM value.
			-- (from WEL_DATA_TYPE)
		ensure -- from WEL_DATA_TYPE
			is_class: class

	frozen to_lresult (i: INTEGER_32): POINTER
			-- Convert integer value i in a valid LRESULT value.
			-- (from WEL_DATA_TYPE)
		ensure -- from WEL_DATA_TYPE
			is_class: class

	frozen to_wparam (i: INTEGER_32): POINTER
			-- Convert integer value i in a valid WPARAM value.
			-- (from WEL_DATA_TYPE)
		ensure -- from WEL_DATA_TYPE
			is_class: class
	
feature -- Drawing mode

	is_anti_aliasing_enabled: BOOLEAN
			-- Should anti-aliasing be used when drawing?
			-- See also: `set_anti_aliasing`.
			-- (from EV_DRAWABLE_IMP)

	set_anti_aliasing (value: BOOLEAN)
			-- Enable (if value) or disable (if not value) anti-aliasing (if supported) when drawing.
			-- Set `is_anti_aliasing_enabled` to value.
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True
		ensure then -- from EV_DRAWABLE_IMP
			is_anti_aliasing_enabled = value
	
feature -- Drawing operations

	Bounding_area: EV_RECTANGLE
			-- Temporary rectangle used internally.
			-- (from EV_DRAWABLE_IMP)

	draw_arc (x, y: INTEGER_32; a_bounding_width, a_bounding_height: INTEGER_32; a_start_angle, an_aperture: REAL_32)
			-- Draw part of an ellipse defined by a rectangular area with an
			-- upper left corner at x,y, width a_bounding_width and height
			-- a_bounding_height.
			-- Start at a_start_angle and stop at a_start_angle + an_aperture.
			-- Angles are measured in radians, and go
			-- counterclockwise from the 3 o'clock angle.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_bounding_width_positive_or_zero: a_bounding_width >= 0
			a_bounding_width_positive_or_zero: a_bounding_height >= 0

	draw_ellipse (x, y, a_bounding_width, a_bounding_height: INTEGER_32)
			-- Draw an ellipse defined by a rectangular area with an
			-- upper left corner at x,y, width a_bounding_width and height
			-- a_bounding_height.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_bounding_width_positive_or_zero: a_bounding_width >= 0
			a_bounding_height_positive_or_zero: a_bounding_height >= 0

	draw_ellipsed_text (x, y: INTEGER_32; a_text: READABLE_STRING_GENERAL; clipping_width: INTEGER_32)
			-- Draw a_text with left of baseline at (x, y) using `font`.
			-- Text is clipped to clipping_width in pixels and ellipses are displayed
			-- to show truncated characters if any.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_text_not_void: a_text /= Void
			clipping_width_positive: clipping_width >= 0

	draw_ellipsed_text_top_left (x, y: INTEGER_32; a_text: READABLE_STRING_GENERAL; clipping_width: INTEGER_32)
			-- Draw a_text with top left corner at (x, y) using `font`.
			-- Text is clipped to clipping_width in pixels and ellipses are displayed
			-- to show truncated characters if any.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_text_not_void: a_text /= Void
			clipping_width_positive: clipping_width >= 0

	draw_pie_slice (x, y: INTEGER_32; a_bounding_width, a_bounding_height: INTEGER_32; a_start_angle, an_aperture: REAL_32)
			-- Draw part of an ellipse defined by a rectangular area with an
			-- upper left corner at x,y, width a_bounding_width and height
			-- a_bounding_height.
			-- Start at a_start_angle and stop at a_start_angle + an_aperture.
			-- The arc is then closed by two segments through (x, 'y').
			-- Angles are measured in radians, start at the
			-- 3 o'clock angle and grow counterclockwise.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_bounding_width_positive_or_zero: a_bounding_width >= 0
			a_bounding_height_positive_or_zero: a_bounding_height >= 0

	draw_pixmap (x, y: INTEGER_32; a_pixmap: EV_PIXMAP)
			-- Draw a_pixmap with upper-left corner on (x, y).
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_pixmap_not_void: a_pixmap /= Void

	draw_point (x, y: INTEGER_32)
			-- Draw point at (x, y).
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True

	draw_polyline (points: ARRAY [EV_COORDINATE]; is_closed: BOOLEAN)
			-- Draw line segments between subsequent points in
			-- points. If is_closed draw line segment between first
			-- and last point in points.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			points_not_void: points /= Void

	draw_rectangle (x, y, a_width, a_height: INTEGER_32)
			-- Draw rectangle with upper-left corner on (x, y)
			-- with size a_width and a_height.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_width_positive_or_zero: a_width >= 0
			a_height_positive_or_zero: a_height >= 0

	draw_rotated_text (x, y: INTEGER_32; a_angle: REAL_32; a_text: READABLE_STRING_GENERAL)
			-- Draw rotated text a_text with left of baseline at (x, y) using `font`.
			-- Rotation is number of radians counter-clockwise from horizontal plane.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_text_not_void: a_text /= Void

	draw_segment (x1, y1, x2, y2: INTEGER_32)
			-- Draw line segment from (x1, 'y1') to (x2, 'y2').
			-- (from EV_DRAWABLE_IMP)
		require -- from  EV_DRAWABLE_I
			True

	draw_straight_line (x1, y1, x2, y2: INTEGER_32)
			-- Draw infinite straight line through (x1,'y1') and (x2,'y2').
			-- (from EV_DRAWABLE_I)

	draw_sub_pixel_buffer (x, y: INTEGER_32; a_pixel_buffer: EV_PIXEL_BUFFER; area: EV_RECTANGLE)
			-- Draw area of a_pixel_buffer with upper-left corner on (x, y).
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_pixel_buffer_not_void: a_pixel_buffer /= Void
			a_pixel_buffer_not_destroyed: not a_pixel_buffer.is_destroyed
			area_not_void: area /= Void

	draw_sub_pixmap (x, y: INTEGER_32; a_pixmap: EV_PIXMAP; area: EV_RECTANGLE)
			-- Draw area of a_pixmap with upper-left corner on (x, y).
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_pixmap_not_void: a_pixmap /= Void
			a_pixmap_not_destroyed: not a_pixmap.is_destroyed
			area_not_void: area /= Void

	draw_text (x, y: INTEGER_32; a_text: READABLE_STRING_GENERAL)
			-- Draw a_text with left of baseline at (x, y) using `font`.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_text_not_void: a_text /= Void

	draw_text_top_left (x, y: INTEGER_32; a_text: READABLE_STRING_GENERAL)
			-- Draw a_text with top left corner at (x, y) using `font`.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_text_not_void: a_text /= Void

	internal_draw_text (x, y: INTEGER_32; angle: REAL_32; clipping_width: INTEGER_32; from_baseline: BOOLEAN; a_text: READABLE_STRING_GENERAL)
			-- Draw a_text with top left corner at (x, y) using `font`.
			-- Text is clipped to clipping_width in pixels and ellipses are displayed
			-- to show truncated characters if any.
			-- Text is rotated counter-clockwise from the horizontal axis degrees degrees.
			-- (from EV_DRAWABLE_IMP)
	
feature -- Filling operations

	fill_ellipse (x, y, a_bounding_width, a_bounding_height: INTEGER_32)
			-- Fill an ellipse defined by a rectangular area with an
			-- upper left corner at x,y, width a_bounding_width and height
			-- a_bounding_height.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_bounding_width_positive_or_zero: a_bounding_width >= 0
			a_bounding_height_positive_or_zero: a_bounding_height >= 0

	fill_pie_slice (x, y: INTEGER_32; a_bounding_width, a_bounding_height: INTEGER_32; a_start_angle, an_aperture: REAL_32)
			-- Fill part of an ellipse defined by a rectangular area with an
			-- upper left corner at x,y, width a_bounding_width and height
			-- a_bounding_height.
			-- Start at a_start_angle and stop at a_start_angle + an_aperture.
			-- The arc is then closed by two segments through (x, 'y').
			-- Angles are measured in radians, start at the 3
			-- o'clock angle and grow counterclockwise.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_bounding_width_positive_or_zero: a_bounding_width >= 0
			a_bounding_height_positive_or_zero: a_bounding_height >= 0

	fill_polygon (points: ARRAY [EV_COORDINATE])
			-- Draw line segments between subsequent points in points.
			-- Fill all enclosed area's with `foreground_color`.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			points_not_void: points /= Void

	fill_rectangle (x, y, a_width, a_height: INTEGER_32)
			-- Draw rectangle with upper-left corner on (x, y)
			-- with size a_width and a_height. Fill with `foreground_color`.
			-- (from EV_DRAWABLE_IMP)
		require -- from EV_DRAWABLE_I
			a_width_positive_or_zero: a_width >= 0
			a_height_positive_or_zero: a_height >= 0
	
feature -- For dialogs

	frozen dwlp_dlgproc: INTEGER_32
			-- (from WEL_GWL_CONSTANTS)

	frozen dwlp_msgresult: INTEGER_32
			-- (from WEL_GWL_CONSTANTS)

	frozen dwlp_user: INTEGER_32
			-- (from WEL_GWL_CONSTANTS)
	
feature -- For windows

	Gwl_hinstance: INTEGER_32 = -6
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwlp_hinstance`.
			-- (from WEL_GWL_CONSTANTS)

	Gwl_hwndparent: INTEGER_32 = -8
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwlp_hwndparent`.
			-- (from WEL_GWL_CONSTANTS)

	Gwl_id: INTEGER_32 = -12
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwlp_id`.
			-- (from WEL_GWL_CONSTANTS)

	Gwl_userdata: INTEGER_32 = -21
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwlp_userdata`.
			-- (from WEL_GWL_CONSTANTS)

	Gwl_wndproc: INTEGER_32 = -4
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwlp_wndproc`.
			-- (from WEL_GWL_CONSTANTS)

	Gwlp_hinstance: INTEGER_32 = -6
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwl_hinstance`.
			-- (from WEL_GWL_CONSTANTS)

	Gwlp_hwndparent: INTEGER_32 = -8
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwl_hwndparent`.
			-- (from WEL_GWL_CONSTANTS)

	Gwlp_id: INTEGER_32 = -12
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwl_id`.
			-- (from WEL_GWL_CONSTANTS)

	Gwlp_userdata: INTEGER_32 = -21
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwl_userdata`.
			-- (from WEL_GWL_CONSTANTS)

	Gwlp_wndproc: INTEGER_32 = -4
			-- Was declared in {WEL_GWL_CONSTANTS} as synonym of `gwl_wndproc`.
			-- (from WEL_GWL_CONSTANTS)
	
feature -- Keyboard event input constants

	Keyeventf_extendedkey: INTEGER_32 = 1
			-- Declared in Windows as KEYEVENTF_EXTENDEDKEY
			-- (from WEL_INPUT_CONSTANTS)

	Keyeventf_keyup: INTEGER_32 = 2
			-- Declared in Windows as KEYEVENTF_KEYUP
			-- (from WEL_INPUT_CONSTANTS)
	
feature -- Keyboard events

	send_keyboard_key_down (virtual_key_code: INTEGER_32)
			-- The keybd_event function synthesizes a keystroke. The system
			-- can use such a synthesized keystroke to generate a
			-- WM_KEYDOWN message.
			--
			-- An application can simulate a press of the PRINTSCRN key in
			-- order to obtain a screen snapshot and save it to the
			-- clipboard.
			-- To do this, call send_keyboard_key_down(Vk_snapshot).
			--
			-- Windows NT: The `send_keyboard_key_down` can toggle the
			-- NUM LOCK, CAPS LOCK, and SCROLL LOCK keys.
			--
			-- Windows 95: The `send_keyboard_key_down` function can toggle
			-- only the CAPS LOCK and SCROLL LOCK keys. It cannot toggle
			-- the NUM LOCK key.
			-- (from WEL_INPUT_EVENT)

	send_keyboard_key_up (virtual_key_code: INTEGER_32)
			-- The keybd_event function synthesizes a keystroke. The system
			-- can use such a synthesized keystroke to generate a
			-- WM_KEYUP message.
			--
			-- Windows NT: The `send_keyboard_key_down` can toggle the
			-- NUM LOCK, CAPS LOCK, and SCROLL LOCK keys.
			--
			-- Windows 95: The `send_keyboard_key_down` function can toggle
			-- only the CAPS LOCK and SCROLL LOCK keys. It cannot toggle
			-- the NUM LOCK key.
			-- (from WEL_INPUT_EVENT)
	
feature -- Mouse Activate constants (MA_xxx).

	Ma_activate: INTEGER_32 = 1
			-- Declared in Windows as MA_ACTIVATE
			-- (from WEL_INPUT_CONSTANTS)

	Ma_activateandeat: INTEGER_32 = 2
			-- Declared in Windows as MA_ACTIVATEANDEAT
			-- (from WEL_INPUT_CONSTANTS)

	Ma_noactivate: INTEGER_32 = 3
			-- Declared in Windows as MA_NOACTIVATE
			-- (from WEL_INPUT_CONSTANTS)

	Ma_noactivateandeat: INTEGER_32 = 4
			-- Declared in Windows as MA_NOACTIVATEANDEAT
			-- (from WEL_INPUT_CONSTANTS)
	
feature -- Mouse and Key constants (MK_xxxx)

	Mk_control: INTEGER_32 = 8
			-- Declared in Windows as MK_CONTROL
			-- (from WEL_INPUT_CONSTANTS)

	Mk_lbutton: INTEGER_32 = 1
			-- Declared in Windows as MK_LBUTTON
			-- (from WEL_INPUT_CONSTANTS)

	Mk_mbutton: INTEGER_32 = 16
			-- Declared in Windows as MK_MBUTTON
			-- (from WEL_INPUT_CONSTANTS)

	Mk_rbutton: INTEGER_32 = 2
			-- Declared in Windows as MK_RBUTTON
			-- (from WEL_INPUT_CONSTANTS)

	Mk_shift: INTEGER_32 = 4
			-- Declared in Windows as MK_SHIFT
			-- (from WEL_INPUT_CONSTANTS)
	
feature -- Mouse event input constants

	Mouseeventf_absolute: INTEGER_32 = 32768
			-- Declared in Windows as MOUSEEVENTF_ABSOLUTE
			-- (from WEL_INPUT_CONSTANTS)

	Mouseeventf_leftdown: INTEGER_32 = 2
			-- Declared in Windows as MOUSEEVENTF_LEFTDOWN
			-- (from WEL_INPUT_CONSTANTS)

	Mouseeventf_leftup: INTEGER_32 = 4
			-- Declared in Windows as MOUSEEVENTF_LEFTUP
			-- (from WEL_INPUT_CONSTANTS)

	Mouseeventf_middledown: INTEGER_32 = 32
			-- Declared in Windows as MOUSEEVENTF_MIDDLEDOWN
			-- (from WEL_INPUT_CONSTANTS)

	Mouseeventf_middleup: INTEGER_32 = 64
			-- Declared in Windows as MOUSEEVENTF_MIDDLEUP
			-- (from WEL_INPUT_CONSTANTS)

	Mouseeventf_move: INTEGER_32 = 1
			-- Declared in Windows as MOUSEEVENTF_MOVE
			-- (from WEL_INPUT_CONSTANTS)

	Mouseeventf_rightdown: INTEGER_32 = 8
			-- Declared in Windows as MOUSEEVENTF_RIGHTDOWN
			-- (from WEL_INPUT_CONSTANTS)

	Mouseeventf_rightup: INTEGER_32 = 16
			-- Declared in Windows as MOUSEEVENTF_RIGHTUP
			-- (from WEL_INPUT_CONSTANTS)

	Mouseeventf_wheel: INTEGER_32 = 2048
			-- Declared in Windows as MOUSEEVENTF_WHEEL
			-- (from WEL_INPUT_CONSTANTS)
	
feature -- Mouse events

	send_mouse_absolute_move (a_x, a_y: INTEGER_32)
			-- Synthesize a fake mouse move to absolute
			-- screen position a_x, a_y.
			--
			-- a_x and a_y contain normalized absolute coordinates
			-- between 0 and 65,535. The event procedure maps these
			-- coordinates onto the display surface. Coordinate (0,0)
			-- maps onto the upper-left corner of the display surface,
			-- (65535,65535) maps onto the lower-right corner.
			--
			-- To determine the size of the screen use
			-- {WEL_SYSTEM_METRICS}.screen_width and
			-- {WEL_SYSTEM_METRICS}.screen_height.
			-- (from WEL_INPUT_EVENT)

	send_mouse_left_button_down
			-- Synthesize a fake press on the left button of the
			-- mouse.
			-- (from WEL_INPUT_EVENT)

	send_mouse_left_button_up
			-- Synthesize a fake press on the left button of the
			-- mouse.
			-- (from WEL_INPUT_EVENT)

	send_mouse_middle_button_down
			-- Synthesize a fake press on the middle button of the
			-- mouse.
			-- (from WEL_INPUT_EVENT)

	send_mouse_middle_button_up
			-- Synthesize a fake press on the middle button of the
			-- mouse.
			-- (from WEL_INPUT_EVENT)

	send_mouse_relative_move (a_x, a_y: INTEGER_32)
			-- Synthesize a fake mouse move.
			-- a_x and a_y are the number of mickeys moved.
			--
			-- A mickey is the amount that a mouse has to move
			-- for it to report that it has moved.
			-- (from WEL_INPUT_EVENT)

	send_mouse_right_button_down
			-- Synthesize a fake press on the right button of the
			-- mouse.
			-- (from WEL_INPUT_EVENT)

	send_mouse_right_button_up
			-- Synthesize a fake press on the right button of the
			-- mouse.
			-- (from WEL_INPUT_EVENT)

	send_mouse_wheel_down
			-- Synthesize a fake mouse wheel rotation backward.
			-- (from WEL_INPUT_EVENT)

	send_mouse_wheel_up
			-- Synthesize a fake mouse wheel rotation forward.
			-- (from WEL_INPUT_EVENT)
	
feature -- Mouse wheel constants

	Wheel_delta: INTEGER_32 = 120
			-- One wheel click is defined as WHEEL_DELTA, which is 120
			-- (from WEL_INPUT_CONSTANTS)
	
feature -- Output

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			io_not_void: Result /= Void

	out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		ensure -- from ANY
			out_not_void: Result /= Void

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		ensure -- from ANY
			instance_free: class

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
	
feature -- Platform

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			operating_environment_not_void: Result /= Void
	
feature -- Session

	drawing_session_depth: INTEGER_32
			-- (from EV_DRAWABLE_I)

	end_drawing_session
			-- End a drawing session.
			-- Used for optimization, to group sequence of drawings.
			-- note: as a drawing session can be inside another drawing session
			-- `end_drawing_session` has to be called as many time as `start_drawing_session` was called.			
			-- (from EV_DRAWABLE_I)
		require -- from EV_DRAWABLE_I
			drawing_session_depth > 0

	is_in_drawing_session: BOOLEAN
			-- Is inside a start/end drawing session?
			-- (from EV_DRAWABLE_I)

	is_in_top_drawing_session: BOOLEAN
			-- Is in the top start/end drawing session?
			-- i.e: not inside another similar drawing session.
			-- (from EV_DRAWABLE_I)

	start_drawing_session
			-- Start a drawing session.
			-- Used for optimization, to group sequence of drawings.
			-- note: as a drawing session can be inside another drawing session
			-- `end_drawing_session` has to be called as many time as `start_drawing_session` was called.			
			-- (from EV_DRAWABLE_I)
		ensure -- from EV_DRAWABLE_I
			drawing_session_depth > 0
	
feature -- Vertical text alignement

	vta_baseline: INTEGER_32
			-- The reference point is on the base line of the text.
			-- (from WEL_TA_CONSTANTS)

	vta_center: INTEGER_32
			-- The reference point is aligned vertically with the center of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)
	
feature -- Virtual Key constants (VK_xxxx)

	Vk_0: INTEGER_32 = 48
			-- (from WEL_INPUT_CONSTANTS)

	Vk_1: INTEGER_32 = 49
			-- (from WEL_INPUT_CONSTANTS)

	Vk_2: INTEGER_32 = 50
			-- (from WEL_INPUT_CONSTANTS)

	Vk_3: INTEGER_32 = 51
			-- (from WEL_INPUT_CONSTANTS)

	Vk_4: INTEGER_32 = 52
			-- (from WEL_INPUT_CONSTANTS)

	Vk_5: INTEGER_32 = 53
			-- (from WEL_INPUT_CONSTANTS)

	Vk_6: INTEGER_32 = 54
			-- (from WEL_INPUT_CONSTANTS)

	Vk_7: INTEGER_32 = 55
			-- (from WEL_INPUT_CONSTANTS)

	Vk_8: INTEGER_32 = 56
			-- (from WEL_INPUT_CONSTANTS)

	Vk_9: INTEGER_32 = 57
			-- Vk_a thru Vk_z are the same as their ASCII equivalents: 'A' thru 'Z'.
			-- (from WEL_INPUT_CONSTANTS)

	Vk_a: INTEGER_32 = 65
			-- (from WEL_INPUT_CONSTANTS)

	Vk_add: INTEGER_32 = 107
			-- Declared in Windows as VK_ADD
			-- (from WEL_INPUT_CONSTANTS)

	Vk_b: INTEGER_32 = 66
			-- (from WEL_INPUT_CONSTANTS)

	Vk_back: INTEGER_32 = 8
			-- Declared in Windows as VK_BACK
			-- (from WEL_INPUT_CONSTANTS)

	Vk_c: INTEGER_32 = 67
			-- (from WEL_INPUT_CONSTANTS)

	Vk_cancel: INTEGER_32 = 3
			-- Declared in Windows as VK_CANCEL
			-- (from WEL_INPUT_CONSTANTS)

	Vk_capital: INTEGER_32 = 20
			-- Declared in Windows as VK_CAPITAL
			-- (from WEL_INPUT_CONSTANTS)

	Vk_clear: INTEGER_32 = 12
			-- Declared in Windows as VK_CLEAR
			-- (from WEL_INPUT_CONSTANTS)

	Vk_control: INTEGER_32 = 17
			-- Declared in Windows as VK_CONTROL
			-- (from WEL_INPUT_CONSTANTS)

	Vk_d: INTEGER_32 = 68
			-- (from WEL_INPUT_CONSTANTS)

	Vk_decimal: INTEGER_32 = 110
			-- Declared in Windows as VK_DECIMAL
			-- (from WEL_INPUT_CONSTANTS)

	Vk_delete: INTEGER_32 = 46
			-- Declared in Windows as VK_DELETE
			-- (from WEL_INPUT_CONSTANTS)

	Vk_divide: INTEGER_32 = 111
			-- Declared in Windows as VK_DIVIDE
			-- (from WEL_INPUT_CONSTANTS)

	Vk_down: INTEGER_32 = 40
			-- Declared in Windows as VK_DOWN
			-- (from WEL_INPUT_CONSTANTS)

	Vk_e: INTEGER_32 = 69
			-- (from WEL_INPUT_CONSTANTS)

	Vk_end: INTEGER_32 = 35
			-- Declared in Windows as VK_END
			-- (from WEL_INPUT_CONSTANTS)

	Vk_escape: INTEGER_32 = 27
			-- Declared in Windows as VK_ESCAPE
			-- (from WEL_INPUT_CONSTANTS)

	Vk_execute: INTEGER_32 = 43
			-- Declared in Windows as VK_EXECUTE
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f: INTEGER_32 = 70
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f1: INTEGER_32 = 112
			-- Declared in Windows as VK_F1
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f10: INTEGER_32 = 121
			-- Declared in Windows as VK_F10
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f11: INTEGER_32 = 122
			-- Declared in Windows as VK_F11
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f12: INTEGER_32 = 123
			-- Declared in Windows as VK_F12
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f13: INTEGER_32 = 124
			-- Declared in Windows as VK_F13
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f14: INTEGER_32 = 125
			-- Declared in Windows as VK_F14
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f15: INTEGER_32 = 126
			-- Declared in Windows as VK_F15
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f16: INTEGER_32 = 127
			-- Declared in Windows as VK_F16
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f17: INTEGER_32 = 128
			-- Declared in Windows as VK_F17
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f18: INTEGER_32 = 129
			-- Declared in Windows as VK_F18
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f19: INTEGER_32 = 130
			-- Declared in Windows as VK_F19
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f2: INTEGER_32 = 113
			-- Declared in Windows as VK_F2
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f20: INTEGER_32 = 131
			-- Declared in Windows as VK_F20
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f21: INTEGER_32 = 132
			-- Declared in Windows as VK_F21
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f22: INTEGER_32 = 133
			-- Declared in Windows as VK_F22
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f23: INTEGER_32 = 134
			-- Declared in Windows as VK_F23
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f24: INTEGER_32 = 135
			-- Declared in Windows as VK_F24
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f3: INTEGER_32 = 114
			-- Declared in Windows as VK_F3
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f4: INTEGER_32 = 115
			-- Declared in Windows as VK_F4
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f5: INTEGER_32 = 116
			-- Declared in Windows as VK_F5
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f6: INTEGER_32 = 117
			-- Declared in Windows as VK_F6
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f7: INTEGER_32 = 118
			-- Declared in Windows as VK_F7
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f8: INTEGER_32 = 119
			-- Declared in Windows as VK_F8
			-- (from WEL_INPUT_CONSTANTS)

	Vk_f9: INTEGER_32 = 120
			-- Declared in Windows as VK_F9
			-- (from WEL_INPUT_CONSTANTS)

	Vk_g: INTEGER_32 = 71
			-- (from WEL_INPUT_CONSTANTS)

	Vk_h: INTEGER_32 = 72
			-- (from WEL_INPUT_CONSTANTS)

	Vk_help: INTEGER_32 = 47
			-- Declared in Windows as VK_HELP
			-- (from WEL_INPUT_CONSTANTS)

	Vk_home: INTEGER_32 = 36
			-- Declared in Windows as VK_HOME
			-- (from WEL_INPUT_CONSTANTS)

	Vk_i: INTEGER_32 = 73
			-- (from WEL_INPUT_CONSTANTS)

	Vk_insert: INTEGER_32 = 45
			-- Declared in Windows as VK_INSERT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_j: INTEGER_32 = 74
			-- (from WEL_INPUT_CONSTANTS)

	Vk_k: INTEGER_32 = 75
			-- (from WEL_INPUT_CONSTANTS)

	Vk_l: INTEGER_32 = 76
			-- (from WEL_INPUT_CONSTANTS)

	Vk_lbutton: INTEGER_32 = 1
			-- Declared in Windows as VK_LBUTTON
			-- (from WEL_INPUT_CONSTANTS)

	Vk_lcontrol: INTEGER_32 = 162
			-- Declared in Windows as VK_LCONTROL
			-- (from WEL_INPUT_CONSTANTS)

	Vk_left: INTEGER_32 = 37
			-- Declared in Windows as VK_LEFT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_lmenu: INTEGER_32 = 164
			-- Declared in Windows as VK_LMENU
			-- (from WEL_INPUT_CONSTANTS)

	Vk_lshift: INTEGER_32 = 160
			-- Declared in Windows as VK_LSHIFT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_m: INTEGER_32 = 77
			-- (from WEL_INPUT_CONSTANTS)

	Vk_mbutton: INTEGER_32 = 4
			-- Declared in Windows as VK_MBUTTON
			-- (from WEL_INPUT_CONSTANTS)

	Vk_menu: INTEGER_32 = 18
			-- Declared in Windows as VK_MENU
			-- (from WEL_INPUT_CONSTANTS)

	Vk_multiply: INTEGER_32 = 106
			-- Declared in Windows as VK_MULTIPLY
			-- (from WEL_INPUT_CONSTANTS)

	Vk_n: INTEGER_32 = 78
			-- (from WEL_INPUT_CONSTANTS)

	Vk_next: INTEGER_32 = 34
			-- Declared in Windows as VK_NEXT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numlock: INTEGER_32 = 144
			-- Declared in Windows as VK_NUMLOCK
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad0: INTEGER_32 = 96
			-- Declared in Windows as VK_NUMPAD0
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad1: INTEGER_32 = 97
			-- Declared in Windows as VK_NUMPAD1
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad2: INTEGER_32 = 98
			-- Declared in Windows as VK_NUMPAD2
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad3: INTEGER_32 = 99
			-- Declared in Windows as VK_NUMPAD3
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad4: INTEGER_32 = 100
			-- Declared in Windows as VK_NUMPAD4
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad5: INTEGER_32 = 101
			-- Declared in Windows as VK_NUMPAD5
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad6: INTEGER_32 = 102
			-- Declared in Windows as VK_NUMPAD6
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad7: INTEGER_32 = 103
			-- Declared in Windows as VK_NUMPAD7
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad8: INTEGER_32 = 104
			-- Declared in Windows as VK_NUMPAD8
			-- (from WEL_INPUT_CONSTANTS)

	Vk_numpad9: INTEGER_32 = 105
			-- Declared in Windows as VK_NUMPAD9
			-- (from WEL_INPUT_CONSTANTS)

	Vk_o: INTEGER_32 = 79
			-- (from WEL_INPUT_CONSTANTS)

	Vk_p: INTEGER_32 = 80
			-- (from WEL_INPUT_CONSTANTS)

	Vk_pause: INTEGER_32 = 19
			-- Declared in Windows as VK_PAUSE
			-- (from WEL_INPUT_CONSTANTS)

	Vk_print: INTEGER_32 = 42
			-- Declared in Windows as VK_PRINT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_prior: INTEGER_32 = 33
			-- Declared in Windows as VK_PRIOR
			-- (from WEL_INPUT_CONSTANTS)

	Vk_q: INTEGER_32 = 81
			-- (from WEL_INPUT_CONSTANTS)

	Vk_r: INTEGER_32 = 82
			-- (from WEL_INPUT_CONSTANTS)

	Vk_rbutton: INTEGER_32 = 2
			-- Declared in Windows as VK_RBUTTON
			-- (from WEL_INPUT_CONSTANTS)

	Vk_rcontrol: INTEGER_32 = 163
			-- Declared in Windows as VK_RCONTROL
			-- (from WEL_INPUT_CONSTANTS)

	Vk_return: INTEGER_32 = 13
			-- Declared in Windows as VK_RETURN
			-- (from WEL_INPUT_CONSTANTS)

	Vk_right: INTEGER_32 = 39
			-- Declared in Windows as VK_RIGHT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_rmenu: INTEGER_32 = 165
			-- Declared in Windows as VK_RMENU
			-- Vk_0 thru Vk_9 are the same as their ASCII equivalents: '0' thru '9'.
			-- (from WEL_INPUT_CONSTANTS)

	Vk_rshift: INTEGER_32 = 161
			-- Declared in Windows as VK_RSHIFT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_s: INTEGER_32 = 83
			-- (from WEL_INPUT_CONSTANTS)

	Vk_scroll: INTEGER_32 = 145
			-- Declared in Windows as VK_SCROLL
			-- (from WEL_INPUT_CONSTANTS)

	Vk_select: INTEGER_32 = 41
			-- Declared in Windows as VK_SELECT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_separator: INTEGER_32 = 108
			-- Declared in Windows as VK_SEPARATOR
			-- (from WEL_INPUT_CONSTANTS)

	Vk_shift: INTEGER_32 = 16
			-- Declared in Windows as VK_SHIFT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_snapshot: INTEGER_32 = 44
			-- Declared in Windows as VK_SNAPSHOT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_space: INTEGER_32 = 32
			-- Declared in Windows as VK_SPACE
			-- (from WEL_INPUT_CONSTANTS)

	Vk_subtract: INTEGER_32 = 109
			-- Declared in Windows as VK_SUBTRACT
			-- (from WEL_INPUT_CONSTANTS)

	Vk_t: INTEGER_32 = 84
			-- (from WEL_INPUT_CONSTANTS)

	Vk_tab: INTEGER_32 = 9
			-- Declared in Windows as VK_TAB
			-- (from WEL_INPUT_CONSTANTS)

	Vk_u: INTEGER_32 = 85
			-- (from WEL_INPUT_CONSTANTS)

	Vk_up: INTEGER_32 = 38
			-- Declared in Windows as VK_UP
			-- (from WEL_INPUT_CONSTANTS)

	Vk_v: INTEGER_32 = 86
			-- (from WEL_INPUT_CONSTANTS)

	Vk_w: INTEGER_32 = 87
			-- (from WEL_INPUT_CONSTANTS)

	Vk_x: INTEGER_32 = 88
			-- (from WEL_INPUT_CONSTANTS)

	Vk_y: INTEGER_32 = 89
			-- (from WEL_INPUT_CONSTANTS)

	Vk_z: INTEGER_32 = 90
			-- (from WEL_INPUT_CONSTANTS)
	
feature --{EV_ANY_I} -- Implementation

	get_dc
			-- Get `dc`.
			-- By default does nothing, but is
			-- redefined by primitives that do not keep a consistent
			-- dc. Example : EV_DRAWING_AREA_IMP
			-- (from EV_DRAWABLE_IMP)

	release_dc
			-- Release `dc`.
			-- By default does nothing, but is
			-- redefined by primitives that do not keep a consistent
			-- dc. Example : EV_DRAWING_AREA_IMP
			-- (from EV_DRAWABLE_IMP)
	
invariant
	dc_not_void: dc /= Void

		-- from EV_ANY_I
	interface_coupled: is_usable implies interface /= Void and then attached_interface.implementation = Current
	base_make_called: is_usable implies base_make_called

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

		-- from EV_DRAWABLE_IMP
	reference_tracked_on_brush: attached internal_brush as l_brush implies l_brush.reference_tracked
	brush_exists: attached internal_brush as l_internal_brush implies l_internal_brush.exists
	reference_tracked_on_pen: attached internal_pen as l_pen implies l_pen.reference_tracked

note
	copyright: "Copyright (c) 1984-2021, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class EV_SCREEN_IMP


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