fix: 计算旋转点

src/graphic/Renderer/Draw.js

@@ -1492,14 +1492,7 @@ export default class Draw {
         })
       );
 
-      const center = { x: 0, y: 0 };
-      vector.points.forEach((point) => {
-        center.x += point.x;
-        center.y += point.y;
-      });
-      center.x /= vector.points.length;
-      center.y /= vector.points.length;
-
+      const center = vector.center;
       const len =
         mathUtil.getDistance(vector.points[0], vector.points[2]) / 2 +
         20 * coordinate.ratio;