Easly generate circle as Polygon2D

CirclePolygon2D.gd

tool
extends Polygon2D
class_name CirclePolygon2D

export (int, 3, 1024, 1) var points = 32 setget set_points
export (float, EXP, 0.1, 1024) var radius = 32.0 setget set_radius

export (bool) var regenerate = true setget set_regenerate

func set_regenerate(new):
	if new == true:
		_generate_circle()
	else:
		regenerate = false

func set_points(new):
	if(points != new):
		points = new
		_generate_circle()

func set_radius(new):
	if(radius != new):
		radius = new
		_generate_circle()

func _generate_circle():
	var arr = PoolVector2Array([])
	for i in points:
		var phi = i * PI * 2.0 / points
		var v = Vector2(sin(phi), cos(phi))
		arr.push_back(v * radius)
	polygon = arr

func _enter_tree():
	if regenerate == true:
		regenerate = false
		_generate_circle()