imageview example added

examples/imageview_example.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Thu May 16 22:28:58 2019
+
+@author: martindrech
+"""
+
+# -*- coding: utf-8 -*-
+"""
+Demonstrates very basic use of ImageItem to display image data inside a ViewBox.
+"""
+
+## Add path to library (just for examples; you do not need this)
+
+from pyqtgraph.Qt import QtCore, QtGui
+import numpy as np
+import pyqtgraph as pg
+import pyqtgraph.ptime as ptime
+
+def _twoD_gaussian(lim=10, sigma=1, x0=0, y0=0):
+    N = 600
+    x, y = np.meshgrid(np.linspace(-lim, lim, N), np.linspace(-lim, lim, N))
+    d = np.sqrt((x - x0) ** 2 + (y - y0) ** 2)
+    g = np.exp(-((d) ** 2 / (2.0 * sigma ** 2)))
+    noise = np.random.normal(size=(N, N))/10
+    return g + noise 
+
+app = QtGui.QApplication([])
+
+## Create window with ImageView widget
+win = QtGui.QMainWindow()
+win.resize(800,800)
+imv = pg.ImageView()
+win.setCentralWidget(imv)
+win.show()
+win.setWindowTitle('pyqtgraph example: ImageView')
+
+
+
+## Create random image
+data = np.asarray([_twoD_gaussian() for i in range(50)])
+i = 0
+
+updateTime = ptime.time()
+fps = 0
+
+def updateData():
+    global img, data, i, updateTime, fps
+
+    ## Display the data
+    imv.setImage(data[i], autoHistogramRange=False, autoLevels=False,
+                 autoRange=False 
+                 )
+    i = (i+1) % data.shape[0]
+
+    QtCore.QTimer.singleShot(1, updateData)
+    now = ptime.time()
+    fps2 = 1.0 / (now-updateTime)
+    updateTime = now
+    fps = fps * 0.9 + fps2 * 0.1
+    
+    #print "%0.1f fps" % fps
+    
+
+updateData()
+
+## Start Qt event loop unless running in interactive mode.
+if __name__ == '__main__':
+    import sys
+    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
+        QtGui.QApplication.instance().exec_()