Update to working version

debug_draw.gd

@@ -0,0 +1,50 @@
+# adapted with thanks from code by GDQuest
+# http://gdquest.com/
+
+extends Node2D
+
+var colors = {
+    'BLUE': Color(.216, .474, .702),
+    'RED': Color(1.0, .329, .298),
+    'YELLOW': Color(.867, .91, .247),
+	'GREEN': Color(.054, .718, .247)
+}
+
+var WIDTH = 5
+var parent = null
+
+func _ready():
+	parent = get_parent()
+	set_process(true)
+	set_process_input(true)
+	set_hidden(true)
+
+func _input(event):
+	#if event.is_action_pressed("ui_focus_next"):
+	#	set_hidden(not is_hidden())
+	pass
+
+func _process(delta):
+	set_global_rot(0)
+	update()
+
+func _draw():
+	draw_arrow(parent.get_linear_velocity(), Vector2(), 1.0, 'YELLOW')
+	draw_arrow(parent.get_applied_force(), Vector2(), 0.5, 'RED')
+
+func draw_arrow(vector, pos, scale, color):
+	color = colors[color]
+	if vector.length() == 0:
+		return
+	draw_line(pos * scale, vector * scale, color, WIDTH)
+	var dir = vector.normalized()
+	draw_triangle(vector * scale, dir, 10, color)
+	draw_circle(pos, 5, color)
+
+func draw_triangle(pos, dir, size, color):
+	var a = pos + dir * size
+	var b = pos + dir.rotated(2*PI/3) * size
+	var c = pos + dir.rotated(4*PI/3) * size
+	var points = Vector2Array([a, b, c])
+	draw_polygon(points, ColorArray([color]))
+