tool
extends Control

var polygon : MMPolygon

var draw_size : Vector2 = Vector2(1, 1)
var draw_offset : Vector2 = Vector2(0, 0)

func _ready() -> void:
	polygon = MMPolygon.new()
	connect("resized", self, "_on_resize")
	_on_resize()

func transform_point(p : Vector2) -> Vector2:
	return draw_offset+p*draw_size

func reverse_transform_point(p : Vector2) -> Vector2:
	return (p-draw_offset)/draw_size

func _draw():
	var current_theme : Theme = get_node("/root/MainWindow").theme
	var bg = current_theme.get_stylebox("panel", "Panel").bg_color
	var fg = current_theme.get_color("font_color", "Label")
	var axes_color : Color = bg.linear_interpolate(fg, 0.25)
	var curve_color : Color = bg.linear_interpolate(fg, 0.75)
	draw_rect(Rect2(draw_offset, draw_size), axes_color, false)
	var tp : Vector2 = transform_point(polygon.points[polygon.points.size()-1])
	for p in polygon.points:
		var tnp = transform_point(p)
		draw_line(tp, tnp, curve_color)
		tp = tnp

func _on_resize() -> void:
	var ds : float = min(rect_size.x, rect_size.y)
	draw_size = Vector2(ds, ds)
	draw_offset = 0.5*(rect_size-draw_size)
	update()