FIX : cast linewidth to float in backends

Author: tacaswell

lib/matplotlib/backend_bases.py

@@ -1041,7 +1041,7 @@ def set_linewidth(self, w):
         """
         Set the linewidth in points
         """
-        self._linewidth = w
+        self._linewidth = float(w)
 
     def set_linestyle(self, style):
         """

lib/matplotlib/backends/backend_cairo.py

@@ -407,7 +407,7 @@ def set_joinstyle(self, js):
 
 
     def set_linewidth(self, w):
-        self._linewidth = w
+        self._linewidth = float(w)
         self.ctx.set_line_width (self.renderer.points_to_pixels(w))
 
 

lib/matplotlib/backends/backend_ps.py

@@ -259,6 +259,7 @@ def set_color(self, r, g, b, store=1):
             if store: self.color = (r,g,b)
 
     def set_linewidth(self, linewidth, store=1):
+        linewidth = float(linewidth)
         if linewidth != self.linewidth:
             self._pswriter.write("%1.3f setlinewidth\n"%linewidth)
             if store: self.linewidth = linewidth
@@ -451,10 +452,10 @@ def option_scale_image(self):
         ps backend support arbitrary scaling of image.
         """
         return True
-        
+
     def option_image_nocomposite(self):
         """
-        return whether to generate a composite image from multiple images on 
+        return whether to generate a composite image from multiple images on
         a set of axes
         """
         return not rcParams['image.composite_image']

lib/matplotlib/backends/backend_wx.py

@@ -558,6 +558,7 @@ def set_linewidth(self, w):
         """
         Set the line width.
         """
+        w = float(w)
         DEBUG_MSG("set_linewidth()", 1, self)
         self.select()
         if w > 0 and w < 1: