[GitHub] LYlanfeng commented on issue #8791: 極坐標軸文字超過四字寬度，其他Lable消失BUG

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

LYlanfeng commented on issue #8791: 極坐標軸文字超過四字寬度，其他Lable消失BUG
URL: https://github.com/apache/incubator-echarts/issues/8791#issuecomment-413086195
 
 
   原因是找到了，就是下面代码造成的，修改源码是可以解决的，可以自己增加一个配置项目，然后修改源码。但是感觉这个应该属于一个bug吧，对于极坐标的类目计算有问题。
   ```javascript
   function calculateCategoryInterval() {
   //...
      var unitSpan = axis.dataToCoord(tickValue + 1) - axis.dataToCoord(tickValue);// 这个计算出来一直是40
   //dataToCoord 这个方式是说是序列尺，但是在这个图好像是否有问题。
       var unitW = Math.abs(unitSpan * Math.cos(rotation)); 
       var unitH = Math.abs(unitSpan * Math.sin(rotation)); // 这个会一直是0，导致下面计算是无穷大
   
       var maxW = 0;
       var maxH = 0;
   
       // Caution: Performance sensitive for large category data.
       // Consider dataZoom, we should make appropriate step to avoid O(n) loop.
       for (; tickValue <= ordinalExtent[1]; tickValue += step) {
           var width = 0;
           var height = 0;
   
           // Polar is also calculated in assumptive linear layout here.
           // Not precise, do not consider align and vertical align
           // and each distance from axis line yet.
           var rect = getBoundingRect(
               labelFormatter(tickValue), params.font, 'center', 'top'
           );
           // Magic number
           width = rect.width * 1.3;
           height = rect.height * 1.3;
   
           // Min size, void long loop.
           maxW = Math.max(maxW, width, 7);
           maxH = Math.max(maxH, height, 7);
       }
   
       var dw = maxW / unitW;
       var dh = maxH / unitH;
       // 0/0 is NaN, 1/0 is Infinity.
       isNaN(dw) && (dw = Infinity);
       isNaN(dh) && (dh = Infinity);
       var interval = Math.max(0, Math.floor(Math.min(dw, dh))); // 最终在这个地方取间隔就会出现问题
     // 在这个地方可以增加一个自己属性配置，而重置interval值为0
   //...
   }
   
   ```

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