Make PDF and PS hatching origin the same as Agg's.

QuLogic · QuLogic · commit 9821dc09131e · 2016-11-09T01:25:21.000-05:00
Agg uses top-left as origin, while PDF/PS use bottom-left. A vertical shift by the page height fixes that. See example in #4108.
diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
@@ -1171,7 +1171,9 @@ def writeHatches(self):
                  'PatternType': 1, 'PaintType': 1, 'TilingType': 1,
                  'BBox': [0, 0, sidelen, sidelen],
                  'XStep': sidelen, 'YStep': sidelen,
-                 'Resources': res})
+                 'Resources': res,
+                 # Change origin to match Agg at top-left.
+                 'Matrix': [1, 0, 0, 1, 0, self.height * 72]})
 
             stroke_rgb, fill_rgb, path = hatch_style
             self.output(stroke_rgb[0], stroke_rgb[1], stroke_rgb[2],
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
@@ -305,6 +305,7 @@ def create_hatch(self, hatch):
             return self._hatches[hatch]
         name = 'H%d' % len(self._hatches)
         linewidth = rcParams['hatch.linewidth']
+        pageheight = self.height * 72
         self._pswriter.write("""\
   << /PatternType 1
      /PaintType 2
@@ -325,6 +326,7 @@ def create_hatch(self, hatch):
      } bind
    >>
    matrix
+   0.0 %(pageheight)f translate
    makepattern
    /%(name)s exch def
 """ % locals())
diff --git a/lib/matplotlib/tests/baseline_images/test_artist/hatching.pdf b/lib/matplotlib/tests/baseline_images/test_artist/hatching.pdf
