Title: PDF backend can now do alpha on hatches. by mnmelo · Pull Request #17049 · matplotlib/matplotlib · GitHub
Open Graph Title: PDF backend can now do alpha on hatches. by mnmelo · Pull Request #17049 · matplotlib/matplotlib
X Title: PDF backend can now do alpha on hatches. by mnmelo · Pull Request #17049 · matplotlib/matplotlib
Description: PR Summary Studied a bit of .PDF and I got this working. Turns out the transparency graphics states (ExtGState) weren't being taught to the hatch pattern writing routine. This completes the fix of hatch alpha on SVG and PDF (#16883). Furthermore, I noticed, after the previous PR (#16890), that there was a bit of mixed behavior between 2 cases: 1. when a Patch edgecolor (and therefore its hatch_color) has alpha; or 2. when the entire Patch has alpha. Case 1 is what I had tried to fix in #16890; however, the test I was relying on was of case 2. Case 2 is more logically and elegantly rendered by doing edge+hatch full opacity and then within an object with alpha. Digging a bit deeper I found I could implement this case 2 behavior by extending the forced_alpha concept to the SVG and PDF renderers: if the parent Patch or Collection has a global alpha, ignore the ones of the elements. I updated two test_artist.py tests to better cover these cases (no added baselines images). The following images showcase the results of the SVG and PDF hatching test, after conversion to PNG. The rightmost, orange-tinted shapes are the ones where alpha was set; on the top diamond only on the edgecolor, on the bottom one on the entire Rectangle: SVG Notice in the top-right shapes how the edge and face/hatch overlap. This no longer occurs if the alpha is set on the entire object (but then the fill is also affected). PDF Notice again in the top-right shape that PDF is cleaner in handling the edge overlap with the face and hatch of the same Patch. It's rendered as a group that is internally opaque (the edge completely occludes the fill and hatch) but still transparent at the edges (I guess this is called a knockout group? I didn't add anything specific to this end). I'm not sure SVG could allow for this but would be cool/cleaner if it did. Feedback appreciated. PR Checklist Has Pytest style unit tests Code is Flake 8 compliant New features are documented, with examples if plot related Documentation is sphinx and numpydoc compliant Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there) Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way
Open Graph Description: PR Summary Studied a bit of .PDF and I got this working. Turns out the transparency graphics states (ExtGState) weren't being taught to the hatch pattern writing routine. This completes the fix...
X Description: PR Summary Studied a bit of .PDF and I got this working. Turns out the transparency graphics states (ExtGState) weren't being taught to the hatch pattern writing routine. This completes the...
Opengraph URL: https://github.com/matplotlib/matplotlib/pull/17049
X: @github
Domain: github.com
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