[GitHub] [incubator-echarts] yuanzhou3118 commented on issue #8002: 【求教】有没有办法让graph用roam缩放的时候，label的字体大小也能一起缩放

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

yuanzhou3118 commented on issue #8002:
URL: https://github.com/apache/incubator-echarts/issues/8002#issuecomment-649245000


   已通过graphRoam实现：
   ```javascript
        // 鼠标滚轮监听放大缩小
        myECharts.on('graphRoam', function(e) {
           const option = that.echartsGraph.getOption(); // 获得当前option.series的zoom
           const textPercent = (option.series[0].zoom - 0.8) / 0.8; // 计算比例,我设置zoom的初始值是0.8
           option.series[0].label.fontSize = 9 + 9 * textPercent // 等比例计算fontSize
           that.echartsGraph.setOption(option); // setOption
         });
   ```
   同理可以加在toolbox内的自定义的“放大”和“缩小”按钮上
   
   希望可以帮助到其他同学 :stuck_out_tongue_closed_eyes:


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