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class
	EG_SPRING_PARTICLE

General
	cluster: physics
	description: 
		"Calculate spring force for a particle.
		force := - center_attraction * (particle_position - center) / distance (particle_position, center)
		+ sum [for all links l element particle link] - (stiffness * link_stiffness (l) * (particle_position - other_position))
		+ sum [for all particle p element particles] electrical_repulsion * (particle_position - other_position) / distance (particle_position, other_position)^3"
	create: make_with_particles

Ancestors
	EG_FORCE_DIRECTED_PHYSICS_PROPERTIES
	EG_PARTICLE_SIMULATION_BH* [G -> NUMERIC]
	EV_MODEL_DOUBLE_MATH

Queries
	arc_cosine (v: REAL_64): REAL_64
	arc_sine (v: REAL_64): REAL_64
	arc_tangent (v: REAL_64): REAL_64
	between (n, a, b: REAL_64): BOOLEAN
	ceiling (v: REAL_64): REAL_64
	center_attraction: REAL_64
	center_x: INTEGER_32
	center_y: INTEGER_32
	cosine (v: REAL_64): REAL_64
	dabs (v: REAL_64): REAL_64
	delta_x (angle, length: REAL_64): REAL_64
	delta_y (angle, length: REAL_64): REAL_64
	distance (x1, y1, x2, y2: REAL_64): REAL_64
	distance_from_line (x, y, x1, y1, x2, y2: REAL_64): REAL_64
	electrical_repulsion: REAL_64
	Euler: REAL_64
	exp (x: REAL_64): REAL_64
	floor (v: REAL_64): REAL_64
	force (a_particle: [like particle_type] EG_LINKABLE_FIGURE): EG_VECTOR2D [REAL_64]
	last_theta_average: REAL_64
	line_angle (x1, y1, x2, y2: REAL_64): REAL_64
	log (v: REAL_64): REAL_64
	log10 (v: REAL_64): REAL_64
	log_2 (v: REAL_64): REAL_64
	modulo (a, b: REAL_64): REAL_64
	particles: LIST [[like particle_type] EG_LINKABLE_FIGURE]
	Pi: REAL_64
	Pi_2: REAL_64
	Pi_4: REAL_64
	point_on_ellipse (x, y, xc, yc, r1, r2: REAL_64): BOOLEAN
	point_on_ellipse_boundary (x, y, xc, yc, r1, r2, width: REAL_64): BOOLEAN
	point_on_line (x, y, x1, y1, x2, y2, width: REAL_64): BOOLEAN
	point_on_polygon (x, y: REAL_64; points: SPECIAL [EV_COORDINATE]): BOOLEAN
	point_on_rectangle (x, y, x1, y1, x2, y2: REAL_64): BOOLEAN
	point_on_rotated_ellipse (x, y, xc, yc, r1, r2, angle: REAL_64): BOOLEAN
	point_on_rotated_ellipse_boundary (x, y, xc, yc, r1, r2, angle, width: REAL_64): BOOLEAN
	point_on_segment (x, y, x1, y1, x2, y2, width: REAL_64): BOOLEAN
	quad_tree: detachable EG_QUAD_TREE
	sine (v: REAL_64): REAL_64
	sqrt (v: REAL_64): REAL_64
	Sqrt2: REAL_64
	stiffness: REAL_64
	tangent (v: REAL_64): REAL_64
	theta: REAL_64

Commands
	set_center (ax, ay: INTEGER_32)
	set_center_attraction (a_value: REAL_64)
	set_electrical_repulsion (a_value: REAL_64)
	set_particles (a_particles: [like particles] LIST [[like particle_type] EG_LINKABLE_FIGURE])
	set_stiffness (a_value: REAL_64)
	set_theta (a_theta: [like theta] REAL_64)



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