Example updates

examples/Arrow.py

 # -*- coding: utf-8 -*-
+
+## Display an animated arrowhead following a curve.
+## This example uses the CurveArrow class, which is a combination
+## of ArrowItem and CurvePoint. 
+##
+## To place a static arrow anywhere in a scene, use ArrowItem.
+## To attach other types of item to a curve, use CurvePoint.
+
+
 ## Add path to library (just for examples; you do not need this)                                                                           
-import sys, os
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
+import initExample ## Add path to library (just for examples; you do not need this)
 
 import numpy as np
 from pyqtgraph.Qt import QtGui, QtCore
@@ -23,6 +31,6 @@ mw.show()
 anim = a.makeAnimation(loop=-1)
 anim.start()
 
-## Start Qt event loop unless running in interactive mode.
-if sys.flags.interactive != 1:
+## Start Qt event loop unless running in interactive mode or using pyside.
+if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
     app.exec_()

examples/CLIexample.py

-## Add path to library (just for examples; you do not need this)
-import sys, os
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
-
+import initExample ## Add path to library (just for examples; you do not need this)
 
 from pyqtgraph.Qt import QtGui, QtCore
 import numpy as np
@@ -17,6 +14,7 @@ data = np.random.normal(size=(500,500))
 pg.show(data, title="Simplest possible image example")
 
 
-## Start Qt event loop unless running in interactive mode.
-if sys.flags.interactive != 1:
+## 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'):
     app.exec_()

examples/Draw.py

 # -*- coding: utf-8 -*-
-## Add path to library (just for examples; you do not need this)
-import sys, os
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
+import initExample ## Add path to library (just for examples; you do not need this)
 
 
 from pyqtgraph.Qt import QtCore, QtGui
@@ -39,6 +37,6 @@ kern = np.array([
 img.setDrawKernel(kern, mask=kern, center=(1,1), mode='add')
 img.setLevels([0, 10])
 
-## Start Qt event loop unless running in interactive mode.
-if sys.flags.interactive != 1:
+## Start Qt event loop unless running in interactive mode or using pyside.
+if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
     app.exec_()

examples/ImageItem.py

@@ -11,11 +11,8 @@ import pyqtgraph.ptime as ptime
 app = QtGui.QApplication([])
 
 ## Create window with GraphicsView widget
-win = QtGui.QMainWindow()
-win.resize(800,800)
 view = pg.GraphicsView()
-win.setCentralWidget(view)
-win.show()
+view.show()  ## show view alone in its own window
 
 ## Allow mouse scale/pan. Normally we use a ViewBox for this, but
 ## for simple examples this is easier.

examples/PlotWidget.py

-#!/usr/bin/python
 # -*- coding: utf-8 -*-
-## Add path to library (just for examples; you do not need this)
-import sys, os
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
+import initExample ## Add path to library (just for examples; you do not need this)
 
 
 from pyqtgraph.Qt import QtGui, QtCore
@@ -82,6 +79,9 @@ line = pg.InfiniteLine(angle=90, movable=True)
 pw3.addItem(line)
 line.setBounds([0,200])
 
-## Start Qt event loop unless running in interactive mode.
-if sys.flags.interactive != 1:
+import initExample ## Add path to library (just for examples; you do not need this)
+
+## 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'):
     app.exec_()

examples/Plotting.py

-#!/usr/bin/python
 # -*- coding: utf-8 -*-
-## Add path to library (just for examples; you do not need this)
-import sys, os
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
+
+## This example demonstrates many of the 2D plotting capabilities
+## in pyqtgraph. All of the plots may be panned/scaled by dragging with 
+## the left/right mouse buttons. Right click on any plot to show a context menu.
+
+
+import initExample ## Add path to library (just for examples; you do not need this)
 
 
 from pyqtgraph.Qt import QtGui, QtCore
@@ -82,6 +85,8 @@ def update():
 lr.sigRegionChanged.connect(update)
 update()
 
-## Start Qt event loop unless running in interactive mode.
-if sys.flags.interactive != 1:
+## 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'):
     app.exec_()
+

examples/initExample.py

+## make this version of pyqtgraph importable before any others
+import sys, os
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))

examples/template.py

+# -*- coding: utf-8 -*-
+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
+
+## 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_()

examples/text.py

+# -*- coding: utf-8 -*-
+## This example shows how to insert text into a scene using QTextItem
+
+
+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
+
+
+x = np.linspace(-100, 100, 1000)
+y = np.sin(x) / x
+plot = pg.plot(x, y)
+
+## Create text object, use HTML tags to specify color (default is black; won't be visible)
+text = pg.TextItem(html='<div style="text-align: center"><span style="color: #FFF;">This is the</span><br><span style="color: #FF0;">PEAK</span></div>')
+plot.addItem(text)
+text.setPos(0, y.max())
+
+
+## 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_()