I'm developing a very simple QGIS plugin to calculate raster average by using GDAL. It uses a QgsMapLayerComboBox and a filter to select only raster layers. However, it needs to select twice a layer at the Combo Box to produce the expected results. The snipped code is:
...def initGui(self): """Create the menu entries and toolbar icons inside the QGIS GUI.""" icon_path = ':/plugins/AverageRaster/AverageRaster.png' self.add_action( icon_path, text=self.tr(u'To calculate raster average'), callback=self.run, parent=self.iface.mainWindow()) self.wcb = QgsMapLayerComboBox(self.dlg) self.wcb.setFixedWidth(220) self.wcb.move(140,40) self.wcb.setFilters( QgsMapLayerProxyModel.RasterLayer )...def run(self): """Run method that performs all the real work""" #My code starts here layer = self.wcb.currentLayer()... self.dlg.show() # Run the dialog event loop result = self.dlg.exec_() # See if OK was pressed if result: # Do something useful here - delete the line containing pass and # substitute with your code. #My code starts here message = "the raster average of " + filename + " is = " + str(average) QMessageBox.information(None, "Raster Average", message) #My code ends hereAt the next image, my Plugin is determining the average of ndvi.tif raster. If I want the average of utah_demUTM2.tif, the expected value is obtained only at the second chance. How can I get the average at the first selection of a layer at the QgsMapLayerComboBox. Thanks in advance.
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...def initGui(self): """Create the menu entries and toolbar icons inside the QGIS GUI.""" icon_path = ':/plugins/AverageRaster/AverageRaster.png' self.add_action( icon_path, text=self.tr(u'To calculate raster average'), callback=self.run, parent=self.iface.mainWindow()) self.wcb = QgsMapLayerComboBox(self.dlg) self.wcb.setFixedWidth(220) self.wcb.move(140,40) self.wcb.setFilters( QgsMapLayerProxyModel.RasterLayer )...def run(self): """Run method that performs all the real work""" #My code starts here layer = self.wcb.currentLayer()... self.dlg.show() # Run the dialog event loop result = self.dlg.exec_() # See if OK was pressed if result: # Do something useful here - delete the line containing pass and # substitute with your code. #My code starts here message = "the raster average of " + filename + " is = " + str(average) QMessageBox.information(None, "Raster Average", message) #My code ends hereAt the next image, my Plugin is determining the average of ndvi.tif raster. If I want the average of utah_demUTM2.tif, the expected value is obtained only at the second chance. How can I get the average at the first selection of a layer at the QgsMapLayerComboBox. Thanks in advance.
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