From 29f0344f89483af840175ba4049ed8e467a3d567 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Thu, 2 Aug 2012 12:19:48 -0400
Subject: [PATCH] Only call figure.show if it exits.

For example, figures generated with the Agg backend don't have a
'show' method.
---
 pypiezo/afm.py     | 3 ++-
 pypiezo/base.py    | 3 ++-
 pypiezo/surface.py | 3 ++-
 pypiezo/wiggle.py  | 3 ++-
 4 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/pypiezo/afm.py b/pypiezo/afm.py
index 7e840f6..6e00347 100644
--- a/pypiezo/afm.py
+++ b/pypiezo/afm.py
@@ -260,7 +260,8 @@ class AFMPiezo (_base.Piezo):
             axes.plot(pos_array, def_array, '.', label=timestamp)
             #_pylab.legend(loc='best')
             figure.canvas.draw()
-            figure.show()
+            if hasattr(figure, 'show'):
+                figure.show()
             if not _matplotlib.is_interactive():
                 _matplotlib_pyplot.show()
 
diff --git a/pypiezo/base.py b/pypiezo/base.py
index 55ec00b..3220e21 100644
--- a/pypiezo/base.py
+++ b/pypiezo/base.py
@@ -900,7 +900,8 @@ class Piezo (object):
                 for i,name in enumerate(names):
                     axes.plot(d[:,i], label=name)
             figure.canvas.draw()
-            figure.show()
+            if hasattr(figure, 'show'):
+                figure.show()
             if not _matplotlib.is_interactive():
                 _matplotlib_pyplot.show()
         return input_data
diff --git a/pypiezo/surface.py b/pypiezo/surface.py
index fe096bb..6443ea2 100644
--- a/pypiezo/surface.py
+++ b/pypiezo/surface.py
@@ -236,7 +236,8 @@ def analyze_surface_position_data(
                    fit_fn(final_pos, params)], '-',label='fit')
         #_pylab.legend(loc='best')
         figure.canvas.draw()
-        figure.show()
+        if hasattr(figure, 'show'):
+            figure.show()
         if not _matplotlib.is_interactive():
             _matplotlib_pyplot.show()
 
diff --git a/pypiezo/wiggle.py b/pypiezo/wiggle.py
index 6067ffa..1f0d705 100644
--- a/pypiezo/wiggle.py
+++ b/pypiezo/wiggle.py
@@ -138,7 +138,8 @@ def _setup_plot(piezo, config, output):
     axes.set_title('wiggle for interference %s' % timestamp)
     plot = axes.plot(output, output, 'b.-')
     figure.canvas.draw()
-    figure.show()
+    if hasattr(figure, 'show'):
+        figure.show()
     if not _matplotlib.is_interactive():
         _matplotlib_pyplot.show()
     return (figure, axes, plot)
-- 
2.26.2