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"""
***************************************************************************
Postprocessing.py
---------------------
Date : August 2012
Copyright : (C) 2012 by Victor Olaya
Email : volayaf at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = "Victor Olaya"
__date__ = "August 2012"
__copyright__ = "(C) 2012, Victor Olaya"
import traceback
from typing import Optional
from qgis.PyQt.QtCore import QCoreApplication
from qgis.core import (
Qgis,
QgsProcessingFeedback,
QgsProcessingUtils,
QgsMapLayer,
QgsWkbTypes,
QgsMessageLog,
QgsProcessingContext,
QgsProcessingAlgorithm,
)
from qgis.gui import QgsProcessingGuiUtils
from qgis.utils import iface
from processing.core.ProcessingConfig import ProcessingConfig
from processing.gui.RenderingStyles import RenderingStyles
def determine_output_name(
dest_id: str,
details: QgsProcessingContext.LayerDetails,
alg: QgsProcessingAlgorithm,
context: QgsProcessingContext,
parameters: dict,
) -> str:
"""
If running a model, the execution will arrive here when an
algorithm that is part of that model is executed. We check if
its output is a final output of the model, and adapt the output
name accordingly
"""
for out in alg.outputDefinitions():
if out.name() not in parameters:
continue
output_value = parameters[out.name()]
if hasattr(output_value, "sink"):
output_value = output_value.sink.valueAsString(context.expressionContext())[
0
]
else:
output_value = str(output_value)
if output_value == dest_id:
return out.name()
return details.outputName
def post_process_layer(
output_name: str, layer: QgsMapLayer, alg: QgsProcessingAlgorithm
):
"""
Applies post-processing steps to a layer
"""
style = None
if output_name:
style = RenderingStyles.getStyle(alg.id(), output_name)
if style is None:
if layer.type() == Qgis.LayerType.Raster:
style = ProcessingConfig.getSetting(ProcessingConfig.RASTER_STYLE)
elif layer.type() == Qgis.LayerType.Vector:
if layer.geometryType() == QgsWkbTypes.GeometryType.PointGeometry:
style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POINT_STYLE)
elif layer.geometryType() == QgsWkbTypes.GeometryType.LineGeometry:
style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_LINE_STYLE)
else:
style = ProcessingConfig.getSetting(
ProcessingConfig.VECTOR_POLYGON_STYLE
)
if style:
layer.loadNamedStyle(style)
if layer.type() == Qgis.LayerType.PointCloud:
try:
from qgis._3d import QgsPointCloudLayer3DRenderer
if layer.renderer3D() is None:
# If the layer has no 3D renderer and syncing 3D to 2D
# renderer is enabled, we create a renderer and set it up
# with the 2D renderer
if layer.sync3DRendererTo2DRenderer():
renderer_3d = QgsPointCloudLayer3DRenderer()
renderer_3d.convertFrom2DRenderer(layer.renderer())
layer.setRenderer3D(renderer_3d)
except ImportError:
QgsMessageLog.logMessage(
QCoreApplication.translate(
"Postprocessing",
"3D library is not available, "
"can't assign a 3d renderer to a layer.",
)
)
def handleAlgorithmResults(
alg: QgsProcessingAlgorithm,
context: QgsProcessingContext,
feedback: Optional[QgsProcessingFeedback] = None,
parameters: Optional[dict] = None,
):
if not parameters:
parameters = {}
if feedback is None:
feedback = QgsProcessingFeedback()
wrong_layers = []
feedback.setProgressText(
QCoreApplication.translate("Postprocessing", "Loading resulting layers")
)
i = 0
added_layers: list[QgsProcessingGuiUtils.ResultLayerDetails] = []
layers_to_post_process: list[
tuple[QgsMapLayer, QgsProcessingContext.LayerDetails]
] = []
for dest_id, details in context.layersToLoadOnCompletion().items():
if feedback.isCanceled():
return False
if len(context.layersToLoadOnCompletion()) > 2:
# only show progress feedback if we're loading a bunch of layers
feedback.setProgress(
100 * i / float(len(context.layersToLoadOnCompletion()))
)
try:
layer = QgsProcessingUtils.mapLayerFromString(
dest_id, context, typeHint=details.layerTypeHint
)
if layer is not None:
details.setOutputLayerName(layer)
output_name = determine_output_name(
dest_id, details, alg, context, parameters
)
post_process_layer(output_name, layer, alg)
# Load layer to layer tree root or to a specific group
results_group = QgsProcessingGuiUtils.layerTreeResultsGroup(
details, context
)
# note here that we may not retrieve an owned layer -- eg if the
# output layer already exists in the destination project
owned_map_layer = context.temporaryLayerStore().takeMapLayer(layer)
if owned_map_layer:
# we don't add the layer to the tree yet -- that's done
# later, after we've sorted all added layers
result_layer_details = QgsProcessingGuiUtils.ResultLayerDetails(
owned_map_layer
)
result_layer_details.targetLayerTreeGroup = results_group
result_layer_details.sortKey = details.layerSortKey or 0
result_layer_details.destinationProject = details.project
added_layers.append(result_layer_details)
if details.postProcessor():
# we defer calling the postProcessor set in the context
# until the layer has been added to the project's layer
# tree, just in case the postProcessor contains logic
# relating to layer tree handling
layers_to_post_process.append((layer, details))
else:
wrong_layers.append(str(dest_id))
except Exception:
QgsMessageLog.logMessage(
QCoreApplication.translate(
"Postprocessing", "Error loading result layer:"
)
+ "\n"
+ traceback.format_exc(),
"Processing",
Qgis.MessageLevel.Critical,
)
wrong_layers.append(str(dest_id))
i += 1
if iface is not None:
iface.layerTreeView().setUpdatesEnabled(False)
QgsProcessingGuiUtils.addResultLayers(
added_layers, context, iface.layerTreeView() if iface else None
)
# all layers have been added to the layer tree, so safe to call
# postProcessors now
for layer, details in layers_to_post_process:
details.postProcessor().postProcessLayer(layer, context, feedback)
if iface is not None:
iface.layerTreeView().setUpdatesEnabled(True)
feedback.setProgress(100)
if wrong_layers:
msg = QCoreApplication.translate(
"Postprocessing", "The following layers were not correctly generated."
)
msg += "\n" + "\n".join([f"• {lay}" for lay in wrong_layers]) + "\n"
msg += QCoreApplication.translate(
"Postprocessing",
"You can check the 'Log Messages Panel' in QGIS main window "
"to find more information about the execution of the algorithm.",
)
feedback.reportError(msg)
return len(wrong_layers) == 0
|
