| if try get scale map, coordinate mouse (lon, lat) but wrong value. my code: def init..... ........ self.canvas.useImageToRender(False) self.canvas.setWheelAction(0,1.5) self.canvas.MinScale = 50000000 self.canvas.MaxScale = 500000 self.canvas.setCanvasColor(QColor('#484848')) self.canvas.setContextMenuPolicy(Qt.CustomContextMenu) self.canvas.mapRenderer().setProjectionsEnabled(True) self.crs = QgsCoordinateReferenceSystem() self.crs.createFromProj4("+proj=lcc +lat_1=15 +lat_2=45 +lat_0=30 +lon_0=107 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs") self.canvas.setDestinationCrs(self.crs) self.canvas.mapRenderer().setDestinationCrs(self.crs) self.canvas.setMapUnits(5) self.canvas.scaleChanged.connect(self.scaletitle) ........ def load layer self.layers = [] self.cur_dir = os.path.dirname(os.path.realpath(__file__)) #------------------------------------------------------------- self.layerfilename = os.path.join(self.cur_dir,dataLayer_Tinh[8]) self.layer = QgsVectorLayer(self.layerfilename, dataLayer_Tinh[1], "ogr") self.layer.setCrs(self.crs) QgsMapLayerRegistry.instance().addMapLayer(self.layer) self.layer_Tinh = QgsMapCanvasLayer(self.layer) #------------------------------------------------------------- self.layerfilename = os.path.join(self.cur_dir,dataLayer_Kinhvi[8]) self.layer = QgsVectorLayer(self.layerfilename, dataLayer_Kinhvi[1], "ogr") self.layer.setCrs(self.crs) QgsMapLayerRegistry.instance().addMapLayer(self.layer) self.layer_Kinhvi = QgsMapCanvasLayer(self.layer) self.canvas.setLayerSet(self.layers) self.canvas.setExtent(self.layer.extent()) def scaletitle(self): print self.canvas.scale() self.label_44.setText(str(self.canvas.scale())) And result scale: 3.25806053965e+13 2.63002028251e+13 1.63293972509e+13 6.74310162649e+12 2.53595988062e+12 4.48356555003e+12
Thanks for helping me
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