Fix #2423: Clip markers off figure.

mdboom · mdboom · commit ea4f313bf2e8 · 2013-10-01T18:13:15.000-04:00
diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
@@ -1615,9 +1615,17 @@ def draw_markers(self, gc, marker_path, marker_trans, path, trans, rgbFace=None)
 
         output(Op.gsave)
         lastx, lasty = 0, 0
-        for vertices, code in path.iter_segments(trans, simplify=False):
+        for vertices, code in path.iter_segments(
+                trans,
+                clip=(0, 0, self.file.width*72, self.file.height*72),
+                simplify=False):
             if len(vertices):
                 x, y = vertices[-2:]
+                if (x < 0 or
+                    y < 0 or
+                    x > self.file.width * 72 or
+                    y > self.file.height * 72):
+                    continue
                 dx, dy = x - lastx, y - lasty
                 output(1, 0, 0, 1, dx, dy, Op.concat_matrix,
                        marker, Op.use_xobject)
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
@@ -615,7 +615,10 @@ def draw_markers(self, gc, marker_path, marker_trans, path, trans, rgbFace=None)
             ps_cmd.append('stroke')
         ps_cmd.extend(['grestore', '} bind def'])
 
-        for vertices, code in path.iter_segments(trans, simplify=False):
+        for vertices, code in path.iter_segments(
+                trans,
+                clip=(0, 0, self.width*72, self.height*72),
+                simplify=False):
             if len(vertices):
                 x, y = vertices[-2:]
                 ps_cmd.append("%g %g o" % (x, y))
diff --git a/lib/matplotlib/backends/backend_svg.py b/lib/matplotlib/backends/backend_svg.py
@@ -593,7 +593,9 @@ def draw_markers(self, gc, marker_path, marker_trans, path, trans, rgbFace=None)
 
         trans_and_flip = self._make_flip_transform(trans)
         attrib = {'xlink:href': '#%s' % oid}
-        for vertices, code in path.iter_segments(trans_and_flip, simplify=False):
+        clip = (0, 0, self.width*72, self.height*72)
+        for vertices, code in path.iter_segments(
+                trans_and_flip, clip=clip, simplify=False):
             if len(vertices):
                 x, y = vertices[-2:]
                 attrib['x'] = six.text_type(x)
diff --git a/lib/matplotlib/tests/test_backend_pdf.py b/lib/matplotlib/tests/test_backend_pdf.py
@@ -41,8 +41,7 @@ def test_type42():
 @cleanup
 def test_multipage_pagecount():
     from matplotlib.backends.backend_pdf import PdfPages
-    from io import BytesIO
-    with PdfPages(BytesIO()) as pdf:
+    with PdfPages(io.BytesIO()) as pdf:
         assert pdf.get_pagecount() == 0
         fig = plt.figure()
         ax = fig.add_subplot(111)
@@ -53,6 +52,21 @@ def test_multipage_pagecount():
         assert pdf.get_pagecount() == 2
 
 
+@cleanup
+def test_cull_markers():
+    x = np.random.random(20000)
+    y = np.random.random(20000)
+
+    fig = plt.figure()
+    ax = fig.add_subplot(111)
+    ax.plot(x, y, 'k.')
+    ax.set_xlim(2, 3)
+
+    pdf = io.BytesIO()
+    fig.savefig(pdf, format="pdf")
+    assert len(pdf.getvalue()) < 8000
+
+
 @cleanup
 def test_multipage_keep_empty():
     from matplotlib.backends.backend_pdf import PdfPages
