plainheart commented on a change in pull request #12961:
URL: 
https://github.com/apache/incubator-echarts/pull/12961#discussion_r470588142



##########
File path: src/model/mixin/itemStyle.ts
##########
@@ -54,15 +64,24 @@ class ItemStyleMixin {
         includes?: readonly (keyof ItemStyleOption)[]
     ): ItemStyleProps {
         const style = getItemStyle(this, excludes, includes);
-        const lineDash = this.getBorderLineDash();
-        lineDash && (style.lineDash = lineDash);
+        style.lineDash = this.getBorderLineDash(style.lineWidth);
         return style;
     }
 
-    getBorderLineDash(this: Model): number[] {
+    getBorderLineDash(this: Model, lineWidth?: number): number[] {
         const lineType = this.get('borderType');
-        return (lineType === 'solid' || lineType == null) ? null
-            : (lineType === 'dashed' ? [5, 5] : [1, 1]);
+        if (lineType == null || lineType === 'solid') {
+            return [];
+        }
+
+        lineWidth = lineWidth || 0;
+
+        let dashArray = this.get('borderDashArray');
+        // compatible with single number
+        if (dashArray != null && !isNaN(dashArray)) {
+            dashArray = [+dashArray];
+        }
+        return dashArray || (lineType === 'dashed' ? [5, 5] : [1, 1]);
     }

Review comment:
       The second issue:
   if we make `borderDashArray/dashArray(line)` to be a value of 
`borderType/type(line)`, 
   the `ITEM_STYLE_KEY_MAP` in `model/mixin/itemStyle.ts` will miss the 
property `borderDash` and 
   the `LINE_STYLE_KEY_MAP` in `model/mixin/lineStyle.ts` will miss the 
property `lineDash`.
   
   This two missing properties can't be get by `getItemVisual`, so dash style 
will be not working in some cases like `lines`, 
   refer to 
[chart/helper/Line.ts#L206](https://github.com/apache/incubator-echarts/blob/next/src/chart/helper/Line.ts#L206).
 
   
   It's different from [line 
series](https://github.com/apache/incubator-echarts/blob/next/src/chart/line/LineView.ts#L543)
 and 
[4.x](https://github.com/apache/incubator-echarts/blob/master/src/chart/helper/Line.js#L374)
 which are using `lineStyleModel.getLineStyle()`
   
   So how should I do to make it work for those series dependent on 
`chart/helper/Line.js`?




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