Update to match silx 0.14 and remove some deprecation warnings

xsocs/gui/widgets/XsocsPlot2D.py

@@ -36,18 +36,17 @@ from collections import namedtuple, OrderedDict
 
 import numpy as np
 from matplotlib import cm
-from matplotlib.colors import Normalize
+from matplotlib.colors import Normalize, ListedColormap
 
 
 from silx.gui import qt as Qt
+from silx.gui import colors
 from silx.io.utils import savetxt
 from silx.gui.icons import getQIcon
 from silx.gui.plot import PlotWindow
 from silx.math.histogram import Histogramnd
 from silx.gui.widgets.RangeSlider import RangeSlider
 
-from silx.gui.plot.matplotlib import Colormap
-
 from ..widgets.Containers import GroupBox
 from ..widgets.PointWidget import PointWidget
 from ..widgets.Input import StyledLineEdit
@@ -61,6 +60,16 @@ XsocsPlot2DColormap = namedtuple('XsocsPlot2DColormap',
                                  ['colormap', 'minVal', 'maxVal', 'nColors'])
 
 
+def _getViridis():
+    """Get viridis colormap"""
+    try:
+        return cm.viridis
+    except AttributeError:  # Fallback for matplotlib < 1.5.0 (i.e., debian 8)
+        return ListedColormap(
+            colors.Colormap('viridis').getNColors(256).astype(np.float32) / 255.,
+            name='viridis')
+
+
 def _arrayToPixmap(vector, cmap, nColors=256):
     """
     Creates a pixmap from an array, using the provided colormap.
@@ -134,7 +143,7 @@ class XsocsPlot2DColorDialog(Qt.QDialog):
     """
     colormaps = OrderedDict([('jet', cm.jet),
                              ('afmhot', cm.afmhot),
-                             ('viridis', Colormap.getColormap('viridis')),
+                             ('viridis', _getViridis()),
                              ('gray', cm.gray)])
 
     def __init__(self, plot, curve, **kwargs):