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Setting dashes to (0,0) results in infinite loop for agg backends #1999

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merged 1 commit into from May 14, 2013
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Setting dashes to (0,0) results in infinite loop for agg backends #1999

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4 changes: 4 additions & 0 deletions lib/matplotlib/backend_bases.py
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Expand Up @@ -872,6 +872,10 @@ def set_dashes(self, dash_offset, dash_list):
specifies the on-off sequence as points. ``(None, None)`` specifies a solid line

"""
if dash_list is not None:
dash_list = np.asarray(dash_list)
if np.any(dash_list <= 0.0):
raise ValueError("All values in the dash list must be positive")
self._dashes = dash_offset, dash_list

def set_foreground(self, fg, isRGB=False):
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