GeezerVison

PR summary

This PR includes the test case changes discussed in #32547:

• Adds TestAffine2D._check_transform to run a transform on a point or sequence of points. In the 1D case, this method converts to a numpy array and tests the 2D equivalent in C++.
• The values of TestAffine2D.single_point, TestAffine2D.multiple_points, TestAffine2D.pivot are now explicitly written out at the call site.
• test_translate_plus_other() performs an exact comparison for the translate+scale case.

In addition:

• Instead of hard-coding 26.5650512, 14.0362435 everywhere, I added a new _atan function to return the arctangent in degrees. This exposed a floating point rounding issue on arm64 in test_translate_plus_other(), so I had to change the assert_array_equal to assert_array_almost_equal.

AI Disclosure

None used.

PR quality check

• Use an expressive title, e.g. "Fix title font property precedence"
• New and changed code is tested
• [/] Plotting related features are demonstrated in an example
• [/] New features and API changes have release notes
• [/] Documentation complies with general and docstring guidelines