Building a Complete Mapping Application using Python and QGIS - Building Mapping Applications with QGIS - page 245

self.connect(self.actionZoomOut,
SIGNAL("triggered()"),
self.zoomOut)
self.connect(self.actionPan, SIGNAL("triggered()"),
self.setPanMode)
self.connect(self.actionEdit, SIGNAL("triggered()"),
self.setEditMode)
self.connect(self.actionAddTrack,
SIGNAL("triggered()"),
self.addTrack)
self.connect(self.actionEditTrack,
SIGNAL("triggered()"),
self.editTrack)
self.connect(self.actionDeleteTrack,SIGNAL("triggered()"),
self.deleteTrack)
self.connect(self.actionGetInfo,
SIGNAL("triggered()"),
self.getInfo)
self.connect(self.actionSetStartPoint,
SIGNAL("triggered()"),
self.setStartPoint)
self.connect(self.actionSetEndPoint,
SIGNAL("triggered()"),
self.setEndPoint)
self.connect(self.actionFindShortestPath,
SIGNAL("triggered()"),
self.findShortestPath)
self.mapCanvas = QgsMapCanvas()
self.mapCanvas.useImageToRender(False)
self.mapCanvas.setCanvasColor(Qt.white)
self.mapCanvas.show()
layout = QVBoxLayout()
layout.setContentsMargins(0, 0, 0, 0)
layout.addWidget(self.mapCanvas)
self.centralWidget.setLayout(layout)