![image](https://user-images.githubusercontent.com/13121299/46069643-8a167d00-c1ae-11e8-92ab-185a67630491.png)
你好,现在的需求是以鼠标移动到的指标为中心点,通过方向键以这个中心点放大缩小,主要是这点不知如何处理,想请教下有什么好方法解决

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https://github.com/apache/incubator-echarts/issues/9128 ]
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