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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