[GitHub] [echarts] Ovilia commented on issue #15832: Render custom bar plot with log scale

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

Ovilia commented on issue #15832:
URL: https://github.com/apache/echarts/issues/15832#issuecomment-938364879


   It should be 
   
   ```js
   renderItem: function (params, api) {
       var yValue = api.value(2);
       var start = api.coord([api.value(0), yValue]);
       var x = start[0]
       var y = start[1]
       var size = api.size([api.value(1) - api.value(0), yValue]);
       return {
       type: "rect",
       shape: {
           x: x,
           y: y,
           width: size[0],
           height: size[1]
       },
       style: api.style(),
       };
   },
   ```
   
   According to [api.size](https://echarts.apache.org/en/option.html#series-custom.renderItem.arguments.api.size), you should not omit the second parameter for log axis.
   
   > In some coordinate systems (for example, polar) or when log axis is used, the size is different in different point. So the second parameter is necessary to calculate size on the given point.
   


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