Support getting the vertices of curved paths.

mdboom · mdboom · commit 9a9d70ef6056 · 2008-06-17T14:40:10.000Z
svn path=/trunk/matplotlib/; revision=5570
diff --git a/lib/matplotlib/patches.py b/lib/matplotlib/patches.py
@@ -83,11 +83,17 @@ def __init__(self,
     def get_verts(self):
         """
         return a copy of the vertices used in this patch
+
+        If the patch contains Bezier curves, the curves will be
+        interpolated by line segments.  To access the curves as
+        curves, use :meth:`get_path`.
         """
         trans = self.get_transform()
         path = self.get_path()
-        tverts = trans.transform(path.vertices)
-        return tverts
+        polygons = path.to_polygons(trans)
+        if len(polygons):
+            return polygons[0]
+        return []
 
     def contains(self, mouseevent):
         """Test whether the mouse event occurred in the patch.
diff --git a/lib/matplotlib/path.py b/lib/matplotlib/path.py
@@ -290,14 +290,21 @@ def to_polygons(self, transform=None, width=0, height=0):
         ``MOVETO`` instructions or curves.  This is useful for
         displaying in backends that do not support compound paths or
         Bezier curves, such as GDK.
+
+        If width and height are both non-zero then the lines will be
+        simplified so that vertices outside of (0, 0), (width, height)
+        will be clipped.
         """
+        if len(self.vertices) == 0:
+            return []
+
         if transform is not None:
             transform = transform.frozen()
-        # Deal with the common and simple case
-        if self.codes is None and len(self.vertices) < 100:
-            if len(self.vertices):
+            if self.codes is None:
                 return [transform.transform(self.vertices)]
-            return []
+        else:
+            if self.codes is None:
+                return [self.vertices]
         # Deal with the case where there are curves and/or multiple
         # subpaths (using extension code)
         return convert_path_to_polygons(self, transform, width, height)
diff --git a/src/_path.cpp b/src/_path.cpp
@@ -52,7 +52,7 @@ class _path_module : public Py::ExtensionModule<_path_module>
         add_varargs_method("path_intersects_path", &_path_module::path_intersects_path,
                            "path_intersects_path(p1, p2)");
         add_varargs_method("convert_path_to_polygons", &_path_module::convert_path_to_polygons,
-                           "convert_path_to_polygons(path, trans)");
+                           "convert_path_to_polygons(path, trans, width, height)");
 
         initialize("Helper functions for paths");
     }
@@ -1115,7 +1115,7 @@ Py::Object _path_module::convert_path_to_polygons(const Py::Tuple& args)
     double width = Py::Float(args[2]);
     double height = Py::Float(args[3]);
 
-    bool simplify = !path.has_curves();
+    bool simplify = !path.has_curves() && width != 0.0 && height != 0.0;
 
     transformed_path_t tpath(path, trans);
     simplify_t simplified(tpath, false, simplify, width, height);
