Changed full arrows slightly to avoid an xpdf rendering

jkseppan · jkseppan · commit b474cd63bb4f · 2008-09-07T11:19:13.000Z
problem reported by Friedrich Hagedorn.

svn path=/branches/v0_91_maint/; revision=6073
diff --git a/CHANGELOG b/CHANGELOG
@@ -1,3 +1,6 @@
+2008-09-07 Changed full arrows slightly to avoid an xpdf rendering
+           problem reported by Friedrich Hagedorn. - JKS
+
 2008-08-25 Fix locale issues in SVG backend - MGD
 
 2008-08-01 Backported memory leak fixes in _ttconv.cpp - MGD
diff --git a/lib/matplotlib/patches.py b/lib/matplotlib/patches.py
@@ -634,7 +634,11 @@ def __init__(self, x, y, dx, dy, width=0.001, length_includes_head=False, \
                 if shape == 'right':
                     coords = right_half_arrow
                 elif shape == 'full':
-                    coords=npy.concatenate([left_half_arrow,right_half_arrow[::-1]])
+                    # The half-arrows contain the midpoint of the stem,
+                    # which we can omit from the full arrow. Including it
+                    # twice caused a problem with xpdf.
+                    coords=npy.concatenate([left_half_arrow[:-1],
+                                            right_half_arrow[-2::-1]])
                 else:
                     raise ValueError, "Got unknown shape: %s" % shape
             cx = float(dx)/distance
