Introduce rasterized plotting#16

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mkavulich wants to merge 11 commits intomainfrom

feature/rasterization_without_pixelmap

Commits on Oct 15, 2025

Implement image rasterization; enabled by default, but retaining old polycollection method with plot:polycollection:True
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Trim axes from data bounds prior to rasterization, using new/rewritten get_data_extent() function; also fix level 0 error. Currently may not work for polycollection
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- Add pixel_ratio as a configurable option
mkavulich
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New custom function "sum_of_magnitudes"; used for calculating wind speed from u and v
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New custom colormap imitating the pygraf wind speed colormap
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Some more plotting script improvements:
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Commits on Dec 17, 2025

New custom functions: max_all_times and min_all_times
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