Add ColorbarBase.n_rasterize instead of hardwiring the value.

efiring · efiring · commit 219e13fd3624 · 2015-05-27T20:54:46.000-10:00
diff --git a/lib/matplotlib/colorbar.py b/lib/matplotlib/colorbar.py
@@ -256,6 +256,8 @@ class ColorbarBase(cm.ScalarMappable):
                    'min': slice(1, None),
                    'max': slice(0, -1)}
 
+    n_rasterize = 50  # rasterize solids if number of colors >= n_rasterize
+
     def __init__(self, ax, cmap=None,
                  norm=None,
                  alpha=None,
@@ -517,7 +519,7 @@ def _add_solids(self, X, Y, C):
                                     colors=(mpl.rcParams['axes.edgecolor'],),
                                     linewidths=linewidths)
             self.ax.add_collection(self.dividers)
-        elif len(self._y) > 50:
+        elif len(self._y) >= self.n_rasterize:
             self.solids.set_rasterized(True)
 
     def add_lines(self, levels, colors, linewidths, erase=True):
