The draw_arc code was putting all arcs centered on the origin instead of the proper location. This patch fixes that.
With this, plus my earlier patch #2 to enable clipping, the line_styles.py example is now rendering quite well with the cairo backend. However my patch #1 to add the snapping is messing up line_styles in some places. For example, where there is a strokes sine wave the snapping is interfering with its proper shape. Obviously, snapping smooth, curved user data being plotted like that is a really bad idea. Things that should be snapped are things like frames, grid lines, ticks, and object borders, particularly when aligned with an axis. -Carl
0001-cairo-Fix-implementation-of-draw_arc.patch
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