[GitHub] [incubator-echarts] wjdnlg opened a new issue #11592: 显示折线上任意一点数据(而不是整个坐标系)

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

wjdnlg opened a new issue #11592: 显示折线上任意一点数据(而不是整个坐标系)
URL: https://github.com/apache/incubator-echarts/issues/11592
 
 
   ### What problem does this feature solve?
   当有两条折线他们数据很相近,但有差异 比如速度时间图 两条折线对比但是只能对比传入点的数据 两个传入点之间的数据获取不到,希望可以传入x轴数据能够根据y=......这样一个函数来计算出y轴的值 实现实时对比功能 
   
   ### What does the proposed API look like?
   Echarts已经实现了获取整个坐标系任意一点的像素转化为坐标convertFromPixel 方法,希望可以只获得折线上的坐标,(当datazoom缩放时,横坐标改变了但是他们的纵坐标并没有变化,也就是说不是显示对应x坐标点的y轴的值 如下图
   ![1571884406(1)](https://user-images.githubusercontent.com/53259799/68443898-3c24d300-0210-11ea-9548-3f2cdeae6292.jpg)
   ![1571887520(1)](https://user-images.githubusercontent.com/53259799/68443904-41821d80-0210-11ea-92f9-6b76f26d4f4e.jpg)
   
   )
   
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