Python/Matplotlib:转换轴 <=>数据坐标系 [英] Python/Matplotlib : convert Axis &lt;=&gt; Data coordinates systems

问题描述

我的问题很简单:在matplotlib中，如何轻松地将Axis系统中的坐标转换为Data System中的坐标?(理想情况下，我正在寻找一个简单的函数 output_coords = magic_func(input_coords))

My question is quite simple : in matplotlib, how can I easily convert coordinates in Axis system to/from Data system (Ideally I'm looking for a simple function output_coords = magic_func(input_coords) )

实际上我的确切问题是:我想绘制一个 matplotlib.patches.Ellipse ，他的中心在 Axis 系统中，但他的大小(宽度和长度)在数据系统中.但是 transforms.blended_transform_factory 方法在这种情况下不起作用.

Actually my exact problem is : I'd like to plot an matplotlib.patches.Ellipse with his center in Axis system but his size (width & length) in Data system. But the transforms.blended_transform_factory method doesn't work in this case.

谢谢！

推荐答案

要从 Axes 实例 ax 获取转换，您可以使用

To get transformations from the Axes instance ax, you can use

axis_to_data = ax.transAxes + ax.transData.inverted()
points_data = axis_to_data.transform(points_axis)
data_to_axis = axis_to_data.inverted()
numpy.testing.assert_allclose(points_axis, data_to_axis.transform(points_data))

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