Dear all, I am currently modifying the MacOSX backend to make its interactive/non-interactive behavior consistent with the other backends in matplotlib. When I was testing the backend, I found a new bug that seems to be related to a recent change in backend_bases.py:
https://github.com/matplotlib/matplotlib/commit/4c078ddf68cc0ecc1a5f36009a3e3a8b4921b037#lib/matplotlib/backend_bases.py After this commit, GraphicsContextBase.set_alpha has no effect if alpha==None; previously it would set alpha to 1.0. The bug appears here in Text.draw in text.py: gc = renderer.new_gc() gc.set_foreground(self.get_color()) gc.set_alpha(self.get_alpha()) In this code, self is a Text object, which derives from the Artist class, which initializes its _alpha member to None. So self.get_alpha() returns None, and gc.set_alpha has no effect. The alpha value used then depends on whatever was present in the gc before the call to new_gc, which is backend-dependent; the MacOSX and cairo backends end up with an incorrect alpha value. I guess the easiest solution is to initialize _alpha in the Artist class to 1.0 instead of to None. Thanks, --Michiel ------------------------------------------------------------------------------ EMC VNX: the world's simplest storage, starting under $10K The only unified storage solution that offers unified management Up to 160% more powerful than alternatives and 25% more efficient. Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
