From 15fd82f73ab0c89bba823d89eb042ad5a1fa0e3e Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Tue, 10 Aug 2010 08:33:32 -0400
Subject: [PATCH] Allow None values for plot clicks or SI values

---
 hooke/ui/gui/panel/plot.py | 2 ++
 hooke/util/si.py           | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/hooke/ui/gui/panel/plot.py b/hooke/ui/gui/panel/plot.py
index 66cc64d..602ee65 100644
--- a/hooke/ui/gui/panel/plot.py
+++ b/hooke/ui/gui/panel/plot.py
@@ -189,6 +189,8 @@ class PlotPanel (Panel, wx.Panel):
             return
         d = self._config.get('plot decimals', 2)
         x,y = (event.xdata, event.ydata)
+        if None in [x, y]:
+            return
         xt = ppSI(value=x, unit=self._x_unit, decimals=d)
         yt = ppSI(value=y, unit=self._y_unit, decimals=d)
         point_indexes = []
diff --git a/hooke/util/si.py b/hooke/util/si.py
index 48fe4e0..ac3e633 100644
--- a/hooke/util/si.py
+++ b/hooke/util/si.py
@@ -111,7 +111,7 @@ def ppSI(value, unit='', decimals=None, power=None, pad=False):
     """
     if value == 0:
         return '0'
-    if isnan(value):
+    if value == None or isnan(value):
         return 'NaN'
 
     if power == None:  # auto-detect power
-- 
2.26.2