グリッドラインの描画

1000x640の範囲で16x16の罫線を書く

extends Node2D

func _draw():
	for x in range(0, 1000, 16):
		draw_line(Vector2(x, 0), Vector2(x, 640), Color8(0, 0, 0), 1)
	for y in range(0, 640, 16):
		draw_line(Vector2(0, y), Vector2(1000, y), Color8(0, 0, 0), 1)

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