From f3ff2e741288984d6c4182453f2526eaaab1fbf4 Mon Sep 17 00:00:00 2001
From: Philip Eisenlohr <eisenlohr@egr.msu.edu>
Date: Thu, 2 Jul 2020 10:25:04 -0400
Subject: [PATCH] added __iadd__ method

---
 python/damask/_colormap.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/python/damask/_colormap.py b/python/damask/_colormap.py
index 2533d4d36..c15befcfa 100644
--- a/python/damask/_colormap.py
+++ b/python/damask/_colormap.py
@@ -24,6 +24,11 @@ class Colormap(mpl.colors.ListedColormap):
         return Colormap(np.vstack((self.colors,other.colors)),
                         f'{self.name}+{other.name}')
 
+    def __iadd__(self,other):
+        """Concatenate colormaps."""
+        return Colormap(np.vstack((self.colors,other.colors)),
+                        f'{self.name}+{other.name}')
+
     def __invert__(self):
         """Return inverted colormap."""
         return self.reversed()