Unity2D-UGUI多边形检测 - UGUI | Fasty Blog = 指尖小屋

# PolygonCollider2D

PolygonCollider2D 是 Unity 用于多边形检测的组件，可以进行不规则 UI、2d 对象的射线检测。

为 UI 对象添加如下脚本：

	public class CustomImage : Image
	{
	private PolygonCollider2D _polygon;

	private PolygonCollider2D Polygon
	{
	get
	{
	if (_polygon == null)
	_polygon = GetComponent<PolygonCollider2D>();

	return _polygon;
	}
	}


	public override bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
	{
	Vector3 point;
	RectTransformUtility.ScreenPointToWorldPointInRectangle(rectTransform, screenPoint, eventCamera, out point);
	return Polygon.OverlapPoint(point);
	}
	}