[GitHub] [incubator-echarts] peach5460 edited a comment on issue #12851: dragging以后position错误

[GitBox <gi...@apache.org>]

peach5460 edited a comment on issue #12851:
URL: https://github.com/apache/incubator-echarts/issues/12851#issuecomment-647892763


   进一步的问题，伪代码如下：
   伪代码
   
   ```
   function onShapeDragend(e) {
     //...获取polygon
   
     // 遍历polygon的点,将position叠加上去
     for (let index = 0; index < points.length; index++) {
       points[index][0] = points[index][0] + this.position[0];
       points[index][1] = points[index][1] + this.position[1];
     }
     
     // 替换原来的polygon的点
     myChart.setOption({
       graphic: [
         {
           id: id,
           shape: { points: points },
           position: [0, 0],
         },
       ],
     });
   }
   ```
   
   如果我再dragend事件里，将这个polygon的坐标手动叠加position，然后将position强制设为【0，0】，拖动几次以后，整个echart的基本对象坐标体系就全乱了，polygon再也选不中了(绘制的位置和鼠标拾取的位置不在一个地方)。


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