There is an explicit offset of one pixel on the left when it sets up a
clip box in Agg. I don't know why this is there, but it dates back to
0.98.0, and earlier versions did something completely different. I can
only guess it was to compensate for an earlier bug in the precise
drawing of the axes rectangle. I can't explain why it would have
different behavior on Windows vs. Linux, though.
I have fixed this in SVN r6465 and am including a patch below (which
unfortunately requires a recompile).
Cheers,
Mike
Modified: trunk/matplotlib/src/_backend_agg.cpp
===================================================================
--- trunk/matplotlib/src/_backend_agg.cpp 2008-12-01 19:35:39 UTC (rev
6465)
+++ trunk/matplotlib/src/_backend_agg.cpp 2008-12-02 15:27:23 UTC (rev
6466)
@@ -312,8 +312,8 @@
double l, b, r, t;
if (py_convert_bbox(cliprect.ptr(), l, b, r, t)) {
- rasterizer.clip_box(int(mpl_round(l)) + 1, height - int(mpl_round(b)),
- int(mpl_round(r)), height - int(mpl_round(t)));
+ rasterizer.clip_box(int(mpl_round(l)), height - int(mpl_round(b)),
+ int(mpl_round(r)), height - int(mpl_round(t)));
}
_VERBOSE("RendererAgg::set_clipbox done");
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