collider更改

source/src/Utils/RectangleExt.ts

@@ -1,7 +1,17 @@
 class RectangleExt {
+    /**
+     * 计算两个矩形的并集。结果将是一个包含其他两个的矩形。
+     * @param first 
+     * @param point 
+     */
     public static union(first: Rectangle, point: Vector2){
         let rect = new Rectangle(point.x, point.y, 0, 0);
-        let rectResult = first.union(rect);
-        return new Rectangle(rectResult.x, rectResult.y, rectResult.width, rectResult.height);
+        // let rectResult = first.union(rect);
+        let result = new Rectangle();
+        result.x = Math.min(first.x, rect.x);
+        result.y = Math.min(first.y, rect.y);
+        result.width = Math.max(first.right, rect.right) - result.x;
+        result.height = Math.max(first.bottom, result.bottom) - result.y;
+        return result;
     }
 }