Add QCustomPlot example.

examples/pyplugin/qcustomplot_example.py

+from PythonQt import QtGui, Qt
+from PythonQt.QCustomPlot import QCustomPlot
+
+pens = (
+    Qt.QPen (Qt.Qt.black),
+    Qt.QPen (Qt.Qt.red),
+    Qt.QPen (Qt.Qt.green),
+    Qt.QPen (Qt.Qt.blue),
+    Qt.QPen (Qt.Qt.magenta),
+    Qt.QPen (Qt.Qt.yellow),
+    Qt.QPen (Qt.Qt.cyan),
+    Qt.QPen (Qt.Qt.gray),
+    )
+
+class Plot (QtGui.QWidget):
+  def __init__ (self, plugin):
+    super(Plot, self).__init__ (self)
+    self.plugin = plugin
+
+    self.qcp = QCustomPlot ()
+    layout = QtGui.QVBoxLayout (self)
+    layout.addWidget (self.qcp)
+    self.qcp.setInteraction(1, True) # iRangeDrag
+    self.qcp.setInteraction(2, True) # iRangeZoom
+    self.qcp.setAutoAddPlottableToLegend(True)
+    self.qcp.legend().setVisible(True)
+
+    # The timer user refresh the interface
+    self.timer = Qt.QTimer(self)
+    self.timer.setSingleShot(False)
+    self.timer.setInterval(100)
+    self.timer.connect(Qt.SIGNAL("timeout()"), self._step)
+
+  def makeCurves(self):
+    self.qcp.clearGraphs()
+    self.legends = [ "sin", "cos" ]
+    self.times = []
+    for i,l in enumerate(self.legends):
+      graph = self.qcp.addGraph()
+      graph.setName(l)
+      graph.setPen(pens[i])
+
+  def start(self):
+    self.makeCurves()
+    self.timer.start()
+
+  def stop (self):
+    self.timer.stop()
+
+  def _step(self):
+    t = (self.times[-1] + 1) if len(self.times) > 0 else 0
+    from math import sin, cos
+    x = sin(0.1 * t)
+    y = cos(0.1 * t)
+    self.qcp.addData(0,(t,),(x,))
+    self.qcp.addData(1,(t,),(y,))
+    self.times.append(t)
+    self.zoomFitBest()
+
+  def zoomFitBest (self):
+    self.qcp.rescaleAxes()
+    self.qcp.replot()
+
+class Plugin(QtGui.QDockWidget):
+  def __init__ (self, mainWindow):
+    super(Plugin, self).__init__ ("Gepetto Viewer plugin", mainWindow)
+    self.setObjectName("qcustomplot_widget_example")
+    self.plot = Plot(self)
+    self.setWidget (self.plot)
+
+    toolBar = QtGui.QToolBar ("QCustomPlot buttons")
+    toolBar.addAction(QtGui.QIcon.fromTheme("zoom-fit-best"), "Zoom fit best", self.plot.zoomFitBest)
+    toolBar.addAction(QtGui.QIcon.fromTheme("media-playback-start"), "Start", self.plot.start)
+    toolBar.addAction(QtGui.QIcon.fromTheme("media-playback-stop"), "Stop", self.plot.stop)
+    mainWindow.addToolBar (toolBar)