[processing] update vector layer histogram

alexbruy · alexbruy · commit e0131a75263c · 2017-02-15T20:07:24.000+02:00
diff --git a/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py b/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py
@@ -276,14 +276,16 @@ def __init__(self):
                 #~ PolarPlot(),
             #~ ])
         if hasPlotly:
-            #~ from .VectorLayerHistogram import VectorLayerHistogram
+            from .VectorLayerHistogram import VectorLayerHistogram
             #~ from .RasterLayerHistogram import RasterLayerHistogram
             from .VectorLayerScatterplot import VectorLayerScatterplot
             #~ from .MeanAndStdDevPlot import MeanAndStdDevPlot
             from .BarPlot import BarPlot
             #~ from .PolarPlot import PolarPlot
 
-            self.alglist.extend([VectorLayerScatterplot(), BarPlot()])
+            self.alglist.extend([
+                VectorLayerHistogram(), VectorLayerScatterplot(),
+                BarPlot()])
 
         self.externalAlgs = []  # to store algs added by 3rd party plugins as scripts
 
diff --git a/python/plugins/processing/algs/qgis/VectorLayerHistogram.py b/python/plugins/processing/algs/qgis/VectorLayerHistogram.py
@@ -25,8 +25,8 @@
 
 __revision__ = '$Format:%H$'
 
-import matplotlib.pyplot as plt
-import matplotlib.pylab as lab
+import plotly as plt
+import plotly.graph_objs as go
 
 from processing.core.GeoAlgorithm import GeoAlgorithm
 from processing.core.parameters import ParameterVector
@@ -66,9 +66,7 @@ def processAlgorithm(self, feedback):
         output = self.getOutputValue(self.OUTPUT)
 
         values = vector.values(layer, fieldname)
-        plt.close()
-        plt.hist(values[fieldname], bins)
-        plotFilename = output + '.png'
-        lab.savefig(plotFilename)
-        with open(output, 'w') as f:
-            f.write('<html><img src="' + plotFilename + '"/></html>')
+
+        data = [go.Histogram(x=values[fieldname],
+                             nbinsx=bins)]
+        plt.offline.plot(data, filename=output)
diff --git a/python/plugins/processing/algs/qgis/VectorLayerScatterplot.py b/python/plugins/processing/algs/qgis/VectorLayerScatterplot.py
@@ -72,6 +72,5 @@ def processAlgorithm(self, feedback):
         values = vector.values(layer, xfieldname, yfieldname)
         data = [go.Scatter(x=values[xfieldname],
                            y=values[yfieldname],
-                           mode='markers'
-                          )]
+                           mode='markers')]
         plt.offline.plot(data, filename=output)
