diff --git a/lib/matplotlib/colorbar.py b/lib/matplotlib/colorbar.py
index 7860631e0ce0..b7893182eed9 100644
--- a/lib/matplotlib/colorbar.py
+++ b/lib/matplotlib/colorbar.py
@@ -575,8 +575,8 @@ def _get_ticker_locator_formatter(self):
else:
locator = _ColorbarAutoLocator(self)
else:
- b = self._boundaries[self._inside]
- locator = ticker.FixedLocator(b, nbins=10)
+ b = self.boundaries[self._inside]
+ locator = ticker.FixedLocator(b)
if formatter is None:
if isinstance(self.norm, colors.LogNorm):
@@ -892,7 +892,37 @@ def _process_values(self, b=None):
b = self.boundaries
if b is not None:
self._boundaries = np.asarray(b, dtype=float)
- if self.values is None:
+ if self.values is None and self.boundaries is not None:
+ # define the outside additions
+ if self.extend == 'min':
+ to_add = self._boundaries[0]
+ elif self.extend == 'max':
+ to_add = self._boundaries[-1]
+ elif self.extend == 'both':
+ to_add = self._boundaries[[0, -1]]
+ elif self.extend == 'neither':
+ to_add = []
+ # add values to the colorbar insides
+ boundaries_inside = self._boundaries[self._inside]
+ n_between = max((self.cmap.N-len(to_add)) //
+ (len(boundaries_inside)-1), 1)
+ self._values = np.linspace(boundaries_inside[:-1],
+ boundaries_inside[1:],
+ n_between, endpoint=False,
+ axis=-1).flatten()
+ self._values = np.append(self._values, boundaries_inside[-1])
+ # add back in the boundaries for the extensions
+ self._boundaries = np.sort(np.concatenate([to_add,
+ self._values]))
+ # calculate values at which to plot colors
+ self._values = 0.5 * (self._values[:-1] + self._values[1:])
+ # add back in the boundaries for the extensions, display
+ # colors of extensions at boundary values
+ self._values = np.sort(np.concatenate([to_add,
+ self._values]))
+ if isinstance(self.norm, colors.NoNorm):
+ self._values = (self._values + 0.00001).astype(np.int16)
+ elif self.values is None and self.boundaries is None:
self._values = 0.5 * (self._boundaries[:-1]
+ self._boundaries[1:])
if isinstance(self.norm, colors.NoNorm):
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