Merge pull request matplotlib#576 from cgohlke/patch-6

Fix slider widget polygon

Author: mdboom

lib/matplotlib/patches.py

@@ -768,7 +768,10 @@ def __init__(self, xy, closed=True, **kwargs):
         Patch.__init__(self, **kwargs)
         xy = np.asarray(xy, np.float_)
         self._path = Path(xy)
-        self.set_closed(closed)
+        self._closed = closed
+        if closed and len(xy):
+            xy = np.concatenate([xy, [xy[0]]])
+        self._set_xy(xy)
 
     def get_path(self):
         return self._path
@@ -777,6 +780,8 @@ def get_closed(self):
         return self._closed
 
     def set_closed(self, closed):
+        if self._closed == bool(closed):
+            return
         self._closed = closed
         xy = self._get_xy()
         if closed:

lib/matplotlib/widgets.py

@@ -317,8 +317,8 @@ def _update(self, event):
 
     def set_val(self, val):
         xy = self.poly.xy
-        xy[-1] = val, 0
-        xy[-2] = val, 1
+        xy[2] = val, 1
+        xy[3] = val, 0
         self.poly.xy = xy
         self.valtext.set_text(self.valfmt%val)
         if self.drawon: self.ax.figure.canvas.draw()