axis equal as in matplotlib

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#8,773 opened on Jul 27, 2018 7 comments 0 reactions 0 assignees View on GitHub

waiting-for: community

Description

### One-line summary [问题简述]
x, y 轴均为 value 类型时，如何设置纵横比，aspect ratio,
比如想要画正圆，但当坐标轴纵横比不是1:1 时，画出来的不是正圆，而是椭圆

想要类似于 matplotlib, Matlab 一样的 axis equal 的命令
问题参见

![image](https://user-images.githubusercontent.com/2433806/43334340-c98212bc-91ff-11e8-9f94-f99723fc26f0.png)

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