Fixed up JoystickButton example

examples/JoystickButton.py

@@ -0,0 +1,55 @@
+# -*- 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.
+
+import initExample ## Add path to library (just for examples; you do not need this)
+
+from pyqtgraph.Qt import QtGui, QtCore
+import pyqtgraph as pg
+
+
+app = QtGui.QApplication([])
+mw = QtGui.QMainWindow()
+mw.resize(300,50)
+cw = QtGui.QWidget()
+mw.setCentralWidget(cw)
+layout = QtGui.QGridLayout()
+cw.setLayout(layout)
+mw.show()
+
+l1 = pg.ValueLabel(siPrefix=True, suffix='m')
+l2 = pg.ValueLabel(siPrefix=True, suffix='m')
+jb = pg.JoystickButton()
+jb.setFixedWidth(30)
+jb.setFixedHeight(30)
+
+
+layout.addWidget(l1, 0, 0)
+layout.addWidget(l2, 0, 1)
+layout.addWidget(jb, 0, 2)
+
+x = 0
+y = 0
+def update():
+    global x, y, l1, l2, jb
+    dx, dy = jb.getState()
+    x += dx * 1e-3
+    y += dy * 1e-3
+    l1.setValue(x)
+    l2.setValue(y)
+timer = QtCore.QTimer()
+timer.timeout.connect(update)
+timer.start(30)
+    
+    
+
+
+## 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/__main__.py

@@ -42,7 +42,7 @@ examples = OrderedDict([
         ('ColorButton', '../widgets/ColorButton.py'),
         #('CheckTable', '../widgets/CheckTable.py'),
         #('VerticalLabel', '../widgets/VerticalLabel.py'),
-        ('JoystickButton', '../widgets/JoystickButton.py'),
+        ('JoystickButton', 'JoystickButton.py'),
     ])),
    
     ('GraphicsScene', 'GraphicsScene.py'),

widgets/JoystickButton.py

@@ -4,7 +4,7 @@ from pyqtgraph.Qt import QtGui, QtCore
 __all__ = ['JoystickButton']
 
 class JoystickButton(QtGui.QPushButton):
-    sigStateChanged = QtCore.Signal(object, object)
+    sigStateChanged = QtCore.Signal(object, object)  ## self, state
     
     def __init__(self, parent=None):
         QtGui.QPushButton.__init__(self, parent)
@@ -34,6 +34,9 @@ class JoystickButton(QtGui.QPushButton):
     def doubleClickEvent(self, ev):
         ev.accept()
         
+    def getState(self):
+        return self.state
+        
     def setState(self, *xy):
         xy = list(xy)
         d = (xy[0]**2 + xy[1]**2)**0.5