[GitHub] Ovilia commented on issue #9548: echarts下载的时候添加水印

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

Ovilia commented on issue #9548: echarts下载的时候添加水印
URL: https://github.com/apache/incubator-echarts/issues/9548#issuecomment-446075601
 
 
   1. Add a custom toolbox feature http://echarts.baidu.com/option.html#toolbox.feature
   2. In `onclick`, [get canvas in the form of base64](http://echarts.baidu.com/api.html#echartsInstance.getDataURL)
   3. Create a new canvas and use `drawImage` to draw watermark onto the original chart
   4. [Export canvas](https://stackoverflow.com/questions/10673122/how-to-save-canvas-as-an-image-with-canvas-todataurl)

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