'How to resize the rotated graph in the graph group in c#?

I'm using c# GDI+ to write a function for geometric transformation of a graph, but I'm running into a problem. When I use the Scale and rotateAt methods of the Matrix matrix to scale the rotated graph of the same graph group, I have some problems.

I am searching for a long time on net. But no use. Please help or try to give some ideas how to achieve this.

The function I want to achieve is shown in the figure below：

enter image description here

c++sharp gdi+

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'How to resize the rotated graph in the graph group in c#?

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