MNT: add tolerance to colorbar locator methods

jklymak · jklymak · commit b3bbb8001811 · 2018-09-19T10:50:57.000-07:00
diff --git a/lib/matplotlib/colorbar.py b/lib/matplotlib/colorbar.py
@@ -240,7 +240,8 @@ def tick_values(self, vmin, vmax):
         vmin = max(vmin, self._colorbar.norm.vmin)
         vmax = min(vmax, self._colorbar.norm.vmax)
         ticks = ticker.MaxNLocator.tick_values(self, vmin, vmax)
-        return ticks[(ticks >= vmin) & (ticks <= vmax)]
+        rtol = (vmax - vmin) * 1e-10
+        return ticks[(ticks >= vmin - rtol) & (ticks <= vmax + rtol)]
 
 
 class _ColorbarAutoMinorLocator(ticker.AutoMinorLocator):
@@ -296,7 +297,10 @@ def tick_values(self, vmin, vmax):
         vmin = self._colorbar.norm.vmin
         vmax = self._colorbar.norm.vmax
         ticks = ticker.LogLocator.tick_values(self, vmin, vmax)
-        return ticks[(ticks >= vmin) & (ticks <= vmax)]
+        rtol = (np.log10(vmax) - np.log10(vmin)) * 1e-10
+        ticks = ticks[(np.log10(ticks) >= np.log10(vmin) - rtol)  &
+              (np.log10(ticks) <= np.log10(vmax) + rtol)]
+        return ticks
 
 
 class ColorbarBase(cm.ScalarMappable):
