Added histogram example

examples/__main__.py

@@ -17,12 +17,11 @@ examples = OrderedDict([
     ('ImageView', 'ImageView.py'),
     ('ParameterTree', 'parametertree.py'),
     ('Crosshair / Mouse interaction', 'crosshair.py'),
-    ('Video speed test', 'VideoSpeedTest.py'),
-    ('Plot speed test', 'PlotSpeedTest.py'),
     ('Data Slicing', 'DataSlicing.py'),
     ('Plot Customization', 'customPlot.py'),
     ('Dock widgets', 'dockarea.py'),
     ('Console', 'ConsoleWidget.py'),
+    ('Histograms', 'histogram.py'),
     ('GraphicsItems', OrderedDict([
         ('Scatter Plot', 'ScatterPlot.py'),
         #('PlotItem', 'PlotItem.py'),
@@ -37,6 +36,11 @@ examples = OrderedDict([
         ('Arrow', 'Arrow.py'),
         ('ViewBox', 'ViewBox.py'),
     ])),
+    ('Benchmarks', OrderedDict([
+        ('Video speed test', 'VideoSpeedTest.py'),
+        ('Line Plot update', 'PlotSpeedTest.py'),
+        ('Scatter Plot update', 'ScatterPlotSpeedTest.py'),
+    ])),
     ('3D Graphics', OrderedDict([
         ('Volumetric', 'GLVolumeItem.py'),
         ('Isosurface', 'GLMeshItem.py'),

examples/histogram.py

@@ -0,0 +1,38 @@
+# -*- coding: utf-8 -*-
+"""
+In this example we draw two different kinds of histogram.
+"""
+
+
+import initExample ## Add path to library (just for examples; you do not need this)
+
+import pyqtgraph as pg
+from pyqtgraph.Qt import QtCore, QtGui
+import numpy as np
+
+win = pg.GraphicsWindow()
+win.resize(800,350)
+plt1 = win.addPlot()
+plt2 = win.addPlot()
+
+## make interesting distribution of values
+vals = np.hstack([np.random.normal(size=500), np.random.normal(size=260, loc=4)])
+
+## draw standard histogram
+y,x = np.histogram(vals, bins=np.linspace(-3, 8, 40))
+
+## notice that len(x) == len(y)+1
+## We are required to use stepMode=True so that PlotCurveItem will interpret this data correctly.
+curve = pg.PlotCurveItem(x, y, stepMode=True, fillLevel=0, brush=(0, 0, 255, 80))
+plt1.addItem(curve)
+
+
+## Now draw all points as a nicely-spaced scatter plot
+y = pg.pseudoScatter(vals, spacing=0.15)
+#plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5)
+plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5, symbolPen=(255,255,255,200), symbolBrush=(0,0,255,150))
+
+## Start Qt event loop unless running in interactive mode or using pyside.
+import sys
+if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
+    QtGui.QApplication.instance().exec_()

graphicsWindows.py

@@ -21,13 +21,13 @@ def mkQApp():
 class GraphicsWindow(GraphicsLayoutWidget):
     def __init__(self, title=None, size=(800,600), **kargs):
         mkQApp()
-        self.win = QtGui.QMainWindow()
+        #self.win = QtGui.QMainWindow()
         GraphicsLayoutWidget.__init__(self, **kargs)
-        self.win.setCentralWidget(self)
-        self.win.resize(*size)
+        #self.win.setCentralWidget(self)
+        self.resize(*size)
         if title is not None:
-            self.win.setWindowTitle(title)
-        self.win.show()
+            self.setWindowTitle(title)
+        self.show()
         
 
 class TabWindow(QtGui.QMainWindow):