def _export_basemap(self) -> bool:
self.total_progress_updated.emit(0, 1,
self.trUtf8("Creating base map…"))
if not self._export_basemap_requirements_check():
return False
project = QgsProject.instance()
basemap_extent = self.area_of_interest.boundingBox()
if basemap_extent.isNull() or not basemap_extent.isFinite():
self.warning.emit(
self.tr("Failed to create basemap"),
self.tr(
"Cannot create basemap for the given area of interest."),
)
return False
if not self.project_configuration.base_map_layer.strip():
self.warning.emit(
self.tr("Failed to create basemap"),
self.
tr("No basemap layer selected. Please check the project configuration."
).format(self.project_configuration.base_map_layer),
)
return False
extent = basemap_extent
base_map_type = self.project_configuration.base_map_type
if base_map_type == ProjectProperties.BaseMapType.SINGLE_LAYER:
basemap_layer = project.mapLayer(
self.project_configuration.base_map_layer)
if not basemap_layer:
self.warning.emit(
self.tr("Failed to create basemap"),
self.
tr('Cannot find the configured base layer with id "{}". Please check the project configuration.'
).format(self.project_configuration.base_map_layer),
)
return False
# we need to transform the extent to match the one of the selected layer
extent = QgsCoordinateTransform(
QgsCoordinateReferenceSystem(self.area_of_interest_crs),
project.crs(),
project,
).transformBoundingBox(basemap_extent)
elif base_map_type == ProjectProperties.BaseMapType.MAP_THEME:
if not project.mapThemeCollection().hasMapTheme(
self.project_configuration.base_map_theme):
self.warning.emit(
self.tr("Failed to create basemap"),
self.
tr('Cannot find the configured base theme with name "{}". Please check the project configuration.'
).format(self.project_configuration.base_map_theme),
)
return False
extent_string = "{},{},{},{}".format(
extent.xMinimum(),
extent.xMaximum(),
extent.yMinimum(),
extent.yMaximum(),
)
alg = (QgsApplication.instance().processingRegistry().
createAlgorithmById("native:rasterize"))
params = {
"EXTENT": extent_string,
"EXTENT_BUFFER": 0,
"TILE_SIZE": self.project_configuration.base_map_tile_size,
"MAP_UNITS_PER_PIXEL": self.project_configuration.base_map_mupp,
"MAKE_BACKGROUND_TRANSPARENT": False,
"OUTPUT": os.path.join(self.export_folder, "basemap.gpkg"),
}
if base_map_type == ProjectProperties.BaseMapType.SINGLE_LAYER:
params["LAYERS"] = [self.project_configuration.base_map_layer]
elif base_map_type == ProjectProperties.BaseMapType.MAP_THEME:
params["MAP_THEME"] = self.project_configuration.base_map_theme
feedback = QgsProcessingFeedback()
context = QgsProcessingContext()
context.setProject(QgsProject.instance())
results, ok = alg.run(params, context, feedback)
if not ok:
self.warning.emit(self.tr("Failed to create basemap"),
feedback.textLog())
return False
new_layer = QgsRasterLayer(results["OUTPUT"], self.tr("Basemap"))
resample_filter = new_layer.resampleFilter()
resample_filter.setZoomedInResampler(QgsCubicRasterResampler())
resample_filter.setZoomedOutResampler(QgsBilinearRasterResampler())
self.project_configuration.project.addMapLayer(new_layer, False)
layer_tree = QgsProject.instance().layerTreeRoot()
layer_tree.insertLayer(len(layer_tree.children()), new_layer)
return True
