topvis opened a new issue #10562: Issue of the end points of edges in Graph 
chart
URL: https://github.com/apache/incubator-echarts/issues/10562
 
 
   Version
   4.2.1
   
   Steps to reproduce:
   Open the [official example page for 
graph](https://ecomfe.github.io/echarts-examples/public/editor.html?c=graph-simple)
 and replace the ```option``` with the one below:
   ```JavaScript
   option = {
       title: {
           text: 'Graph 简单示例'
       },
       tooltip: {},
       animationDurationUpdate: 1500,
       animationEasingUpdate: 'quinticInOut',
       series : [
           {
               type: 'graph',
               layout: 'none',
               symbolSize: 50,
               roam: true,
               label: {
                   normal: {
                       show: true
                   }
               },
               symbol: 'roundRect',
               symbolSize: [130, 50],
   
               edgeSymbol: ['circle', 'arrow'],
               edgeSymbolSize: [10, 10],
               edgeLabel: {
                   normal: {
                       textStyle: {
                           fontSize: 20
                       }
                   }
               },
               data: [{
                   name: '节点1',
                   x: 300,
                   y: 300
               }, {
                   name: '节点2',
                   x: 800,
                   y: 300
               }, {
                   name: '节点3',
                   x: 550,
                   y: 100
               }, {
                   name: '节点4',
                   x: 550,
                   y: 500
               }],
               // links: [],
               links: [{
                   source: 0,
                   target: 1,
                   symbolSize: [15, 20],
                   label: {
                       normal: {
                           show: true
                       }
                   },
                   lineStyle: {
                       normal: {
                           width: 5,
                           curveness: 0
                       }
                   }
               }, {
                   source: '节点2',
                   target: '节点1',
                   label: {
                       normal: {
                           show: true
                       }
                   },
                   lineStyle: {
                       normal: { curveness: 0.2 }
                   }
               }, {
                   source: '节点1',
                   target: '节点3'
               }, {
                   source: '节点2',
                   target: '节点3'
               }, {
                   source: '节点2',
                   target: '节点4'
               }, {
                   source: '节点1',
                   target: '节点4'
               }],
               lineStyle: {
                   normal: {
                       opacity: 0.9,
                       width: 2,
                       curveness: 0
                   }
               }
           }
       ]
   };
   ```
   
   
   
   What is expected?
   The end points of the edges should be visible.
   
   What is actually happening?
   The end points of the edges between "节点 1" and "节点 2" are not visible 
because they are behind the nodes.
   
   
![image](https://user-images.githubusercontent.com/5996531/58479630-37e98980-818b-11e9-8d69-62a1fe527f76.png)
   
   
   
   

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