1 files changed, 68 insertions, 0 deletions
diff --git a/Stages/eraser.gd b/Stages/eraser.gd
new file mode 100644
index 0000000..8595e6f
--- /dev/null
+++ b/Stages/eraser.gd
@@ -0,0 +1,68 @@
+extends Node2D
+
+
+var is_erasing = false
+@onready var ground = get_parent().get_node("GroundCollision") as StaticBody2D
+@onready var map = get_parent().get_node("Map") as Node2D
+@onready var tilemap = map.get_child(0).get_child(0)
+
+var size = Vector2(12, 12)
+var carve_area := PackedVector2Array([
+	(size / 2) * Vector2(-1, -1),
+	(size / 2) * Vector2(1, -1),
+	(size / 2) * Vector2(1, 1),
+	(size / 2) * Vector2(-1, 1),
+])
+
+
+func _ready():
+	map.get_child(0).polygon = ground.get_child(0).polygon
+
+
+func _physics_process(_delta: float) -> void:
+	if Input.is_action_just_pressed("select"):
+		is_erasing = true
+	if Input.is_action_just_released("select"):
+		is_erasing = false
+	
+	global_position = get_global_mouse_position()
+	queue_redraw()
+	
+	if Input.is_action_just_pressed("select"): #if is_erasing:
+		var points = PackedVector2Array()
+		for point in carve_area:
+			points.append(global_position + point)
+		
+		var collision_polygons = ground.get_children()
+		var visibility_polygons = map.get_children()
+		for idx in range(collision_polygons.size()):
+			var collision_node: CollisionPolygon2D = collision_polygons[idx]
+			var visilibty_node: Polygon2D = visibility_polygons[idx]
+			
+			var clipped = Geometry2D.clip_polygons(collision_node.polygon, points)
+			#print(clipped.size(), clipped)
+			if clipped.size() > 0 and not Geometry2D.is_polygon_clockwise(clipped[0]):
+				collision_node.polygon = clipped[0]
+				visilibty_node.polygon = clipped[0]
+				
+				if clipped.size() > 1 and not Geometry2D.is_polygon_clockwise(clipped[1]):
+					var p = CollisionPolygon2D.new()
+					p.polygon = clipped[1]
+					ground.add_child(p)
+					var po = Polygon2D.new()
+					po.polygon = clipped[1]
+					po.clip_children = CanvasItem.CLIP_CHILDREN_ONLY
+					po.add_child(tilemap.duplicate())
+					map.add_child(po)
+
+
+func _draw() -> void:
+	draw_rect(
+		Rect2((size / 2) * -1, size),
+		Color("#fff"),
+		is_erasing
+	)
+	draw_colored_polygon( # TODO: use carve_area to draw
+		carve_area,
+		Color("#fff")
+	)