Added brief pause before map display to support refresh on slower machines

examples/pltslamshow.py

@@ -25,6 +25,7 @@ import matplotlib.pyplot as plt
 import matplotlib.cm as colormap
 from math import sin, cos, radians
 import numpy as np
+from time import sleep
 
 class SlamShow(object):
 
@@ -78,6 +79,9 @@ class SlamShow(object):
 
         mapimg = np.reshape(np.frombuffer(mapbytes, dtype=np.uint8), (self.map_size_pixels, self.map_size_pixels))
 
+        # Pause to allow display to refresh
+        sleep(.001)
+
         if self.img_artist is None:
 
             self.img_artist = self.ax.imshow(mapimg, cmap=colormap.gray)