Merge pull request #48 from Eric89GXL/int-fix

FIX: Explicit int to suppress numpy warning

Author: agramfort

surfer/viz.py

@@ -1345,7 +1345,8 @@ def scale_data_colormap(self, fmin, fmid, fmax, transparent):
         n_colors2 = int(n_colors / 2)
 
         # Index of fmid in new colorbar
-        fmid_idx = np.round(n_colors * ((fmid - fmin) / (fmax - fmin))) - 1
+        fmid_idx = int(np.round(n_colors * ((fmid - fmin) / (fmax - fmin)))
+                       - 1)
 
         # Go through channels
         for i in range(4):