Added ViewBox test suite

pyqtgraph/graphicsItems/tests/ViewBox.py

+"""
+ViewBox test cases:
+
+* call setRange then resize; requested range must be fully visible
+* lockAspect works correctly for arbitrary aspect ratio
+* autoRange works correctly with aspect locked
+* call setRange with aspect locked, then resize
+* AutoRange with all the bells and whistles
+    * item moves / changes transformation / changes bounds
+    * pan only
+    * fractional range
+
+
+"""
+
+import pyqtgraph as pg
+app = pg.mkQApp()
+win = pg.GraphicsWindow()
+vb = win.addViewBox(name="image view")
+vb.setAspectLocked()
+p1 = win.addPlot(name="plot 1")
+p2 = win.addPlot(name="plot 2", row=1, col=0)
+win.ci.layout.setRowFixedHeight(1, 150)
+win.ci.layout.setColumnFixedWidth(1, 150)
+
+def viewsMatch():
+    r0 = pg.np.array(vb.viewRange())
+    r1 = pg.np.array(p1.vb.viewRange()[1])
+    r2 = pg.np.array(p2.vb.viewRange()[1])
+    match = (abs(r0[1]-r1) <= (abs(r1) * 0.001)).all() and (abs(r0[0]-r2) <= (abs(r2) * 0.001)).all()
+    return match
+
+p1.setYLink(vb)
+p2.setXLink(vb)
+print "link views match:", viewsMatch()
+win.show()
+print "show views match:", viewsMatch()
+imgData = pg.np.zeros((10, 10))
+imgData[0] = 1
+imgData[-1] = 1
+imgData[:,0] = 1
+imgData[:,-1] = 1
+img = pg.ImageItem(imgData)
+vb.addItem(img)
+p1.plot(x=imgData.sum(axis=0), y=range(10))
+p2.plot(x=range(10), y=imgData.sum(axis=1))
+print "add items views match:", viewsMatch()
+#p1.setAspectLocked()
+#grid = pg.GridItem()
+#vb.addItem(grid)
+
+
+#app.processEvents()
+#print "init views match:", viewsMatch()
+#p2.setYRange(-300, 300)
+#print "setRange views match:", viewsMatch()
+#app.processEvents()
+#print "setRange views match (after update):", viewsMatch()
+
+#print "--lock aspect--"
+#p1.setAspectLocked(True)
+#print "lockAspect views match:", viewsMatch()
+#p2.setYRange(-200, 200)
+#print "setRange views match:", viewsMatch()
+#app.processEvents()
+#print "setRange views match (after update):", viewsMatch()
+
+#win.resize(100, 600)
+#app.processEvents()
+#vb.setRange(xRange=[-10, 10], padding=0)
+#app.processEvents()
+#win.resize(600, 100)
+#app.processEvents()
+#print vb.viewRange()