[GitHub] [incubator-echarts] MINDoSOFT opened a new issue #10618: SaveAsImage add chart watermark

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

MINDoSOFT opened a new issue #10618: SaveAsImage add chart watermark
URL: https://github.com/apache/incubator-echarts/issues/10618
 
 
   ### What problem does this feature solve?
   I need to add some customization on the chart (e.g. watermark), that needs to happen only when the chart's saveAsImage toolbox button is clicked.
   
   ### What does the proposed API look like?
   I believe this can be fixed with 2 different ways.
   
   One way is to add a backgroundImage option is saveAsImage chart option.
   
   https://ecomfe.github.io/echarts-doc/public/en/option.html#toolbox.feature.saveAsImage
   
   this backgroundImage will be added as background to the chart only in the exported image
   produced when the chart's saveAsImage toolbox button is clicked.
   
   The other way I can think of is to add two events on the chart called saveAsImageBefore/After (like restore event exists)
   
   https://ecomfe.github.io/echarts-doc/public/en/api.html#events.restore
   
   saveAsImageBefore will have some code to draw the watermark, and saveAsImageAfter will hide the watermark.
   
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