def loadProject(filename):
# clear the map layer registry
QgsProject.instance().removeAllMapLayers()
assert os.path.exists(filename), "project file does not exist: " + filename
# load the project
QgsProject.instance().read(filename)
assert QgsProject.instance().mapLayers(), "no layers in map layer registry"
doc = QDomDocument()
with open(filename, encoding="utf-8") as f:
doc.setContent(f.read())
# map settings
mapSettings = QgsMapSettings()
mapSettings.readXml(doc.elementsByTagName("mapcanvas").at(0))
# visible layers
layerIds = []
nodes = doc.elementsByTagName("legendlayer")
for i in range(nodes.count()):
elem = nodes.at(i).toElement().elementsByTagName("legendlayerfile").at(
0).toElement()
if elem.attribute("visible") == "1":
layerIds.append(elem.attribute("layerid"))
mapSettings.setLayers(getLayersByLayerIds(layerIds))
# canvas color
red = int(
doc.elementsByTagName("CanvasColorRedPart").at(0).toElement().text())
green = int(
doc.elementsByTagName("CanvasColorGreenPart").at(0).toElement().text())
blue = int(
doc.elementsByTagName("CanvasColorBluePart").at(0).toElement().text())
mapSettings.setBackgroundColor(QColor(red, green, blue))
return mapSettings
