mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-03 00:02:25 -05:00
287 lines
13 KiB
Python
287 lines
13 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
RasterLayerCalculator.py
|
|
---------------------
|
|
Date : November 2016
|
|
Copyright : (C) 2016 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__ = 'November 2016'
|
|
__copyright__ = '(C) 2016, Victor Olaya'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
import os
|
|
import math
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
from processing.algs.gdal.GdalUtils import GdalUtils
|
|
from qgis.core import (QgsProcessing,
|
|
QgsProcessingException,
|
|
QgsProcessingUtils,
|
|
QgsProcessingParameterCrs,
|
|
QgsProcessingParameterMultipleLayers,
|
|
QgsProcessingParameterNumber,
|
|
QgsProcessingParameterExtent,
|
|
QgsProcessingParameterRasterDestination,
|
|
QgsProcessingParameterRasterLayer,
|
|
QgsProcessingOutputRasterLayer,
|
|
QgsProcessingParameterString,
|
|
QgsCoordinateTransform,
|
|
QgsMapLayer)
|
|
from qgis.PyQt.QtCore import QObject
|
|
from qgis.analysis import QgsRasterCalculator, QgsRasterCalculatorEntry
|
|
|
|
|
|
class RasterCalculator(QgisAlgorithm):
|
|
|
|
LAYERS = 'LAYERS'
|
|
EXTENT = 'EXTENT'
|
|
CELLSIZE = 'CELLSIZE'
|
|
EXPRESSION = 'EXPRESSION'
|
|
CRS = 'CRS'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def group(self):
|
|
return self.tr('Raster analysis')
|
|
|
|
def groupId(self):
|
|
return 'rasteranalysis'
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def initAlgorithm(self, config=None):
|
|
class ParameterRasterCalculatorExpression(QgsProcessingParameterString):
|
|
|
|
def __init__(self, name='', description='', multiLine=False):
|
|
super().__init__(name, description, multiLine=multiLine)
|
|
self.setMetadata({
|
|
'widget_wrapper': 'processing.algs.qgis.ui.RasterCalculatorWidgets.ExpressionWidgetWrapper'
|
|
})
|
|
|
|
def type(self):
|
|
return 'raster_calc_expression'
|
|
|
|
def clone(self):
|
|
return ParameterRasterCalculatorExpression(self.name(), self.description(), self.multiLine())
|
|
|
|
self.addParameter(ParameterRasterCalculatorExpression(self.EXPRESSION, self.tr('Expression'),
|
|
multiLine=True))
|
|
self.addParameter(QgsProcessingParameterMultipleLayers(self.LAYERS,
|
|
self.tr('Reference layer(s) (used for automated extent, cellsize, and CRS)'),
|
|
layerType=QgsProcessing.TypeRaster,
|
|
optional=True))
|
|
self.addParameter(QgsProcessingParameterNumber(self.CELLSIZE,
|
|
self.tr('Cell size (use 0 or empty to set it automatically)'),
|
|
type=QgsProcessingParameterNumber.Double,
|
|
minValue=0.0, defaultValue=0.0, optional=True))
|
|
self.addParameter(QgsProcessingParameterExtent(self.EXTENT,
|
|
self.tr('Output extent'),
|
|
optional=True))
|
|
self.addParameter(QgsProcessingParameterCrs(self.CRS, 'Output CRS', optional=True))
|
|
self.addParameter(QgsProcessingParameterRasterDestination(self.OUTPUT, self.tr('Output')))
|
|
|
|
def name(self):
|
|
return 'rastercalculator'
|
|
|
|
def displayName(self):
|
|
return self.tr('Raster calculator')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
expression = self.parameterAsString(parameters, self.EXPRESSION, context)
|
|
layers = self.parameterAsLayerList(parameters, self.LAYERS, context)
|
|
|
|
layersDict = {}
|
|
if layers:
|
|
layersDict = {lyr.source(): lyr for lyr in layers}
|
|
|
|
crs = self.parameterAsCrs(parameters, self.CRS, context)
|
|
if crs is None or not crs.isValid():
|
|
if not layers:
|
|
raise QgsProcessingException(self.tr("No reference layer selected nor CRS provided"))
|
|
else:
|
|
crs = list(layersDict.values())[0].crs()
|
|
|
|
bbox = self.parameterAsExtent(parameters, self.EXTENT, context)
|
|
if bbox.isNull() and not layers:
|
|
raise QgsProcessingException(self.tr("No reference layer selected nor extent box provided"))
|
|
|
|
if not bbox.isNull():
|
|
bboxCrs = self.parameterAsExtentCrs(parameters, self.EXTENT, context)
|
|
if bboxCrs != crs:
|
|
transform = QgsCoordinateTransform(bboxCrs, crs, context.project())
|
|
bbox = transform.transformBoundingBox(bbox)
|
|
|
|
if bbox.isNull() and layers:
|
|
bbox = QgsProcessingUtils.combineLayerExtents(layers, crs)
|
|
|
|
cellsize = self.parameterAsDouble(parameters, self.CELLSIZE, context)
|
|
if cellsize == 0 and not layers:
|
|
raise QgsProcessingException(self.tr("No reference layer selected nor cellsize value provided"))
|
|
|
|
def _cellsize(layer):
|
|
ext = layer.extent()
|
|
if layer.crs() != crs:
|
|
transform = QgsCoordinateTransform(layer.crs(), crs, context.project())
|
|
ext = transform.transformBoundingBox(ext)
|
|
return (ext.xMaximum() - ext.xMinimum()) / layer.width()
|
|
if cellsize == 0:
|
|
cellsize = min([_cellsize(lyr) for lyr in layersDict.values()])
|
|
|
|
# check for layers available in the model
|
|
layersDictCopy = layersDict.copy() # need a shallow copy because next calls invalidate iterator
|
|
for lyr in layersDictCopy.values():
|
|
expression = self.mappedNameToLayer(lyr, expression, layersDict, context)
|
|
|
|
# check for layers available in the project
|
|
for lyr in QgsProcessingUtils.compatibleRasterLayers(context.project()):
|
|
expression = self.mappedNameToLayer(lyr, expression, layersDict, context)
|
|
|
|
# create the list of layers to be passed as inputs to RasterCalculaltor
|
|
# at this phase expression has been modified to match available layers
|
|
# in the current scope
|
|
entries = []
|
|
for name, lyr in layersDict.items():
|
|
for n in range(lyr.bandCount()):
|
|
ref = '{:s}@{:d}'.format(name, n + 1)
|
|
|
|
if ref in expression:
|
|
entry = QgsRasterCalculatorEntry()
|
|
entry.ref = ref
|
|
entry.raster = lyr
|
|
entry.bandNumber = n + 1
|
|
entries.append(entry)
|
|
|
|
output = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
|
|
|
|
width = math.floor((bbox.xMaximum() - bbox.xMinimum()) / cellsize)
|
|
height = math.floor((bbox.yMaximum() - bbox.yMinimum()) / cellsize)
|
|
driverName = GdalUtils.getFormatShortNameFromFilename(output)
|
|
|
|
calc = QgsRasterCalculator(expression,
|
|
output,
|
|
driverName,
|
|
bbox,
|
|
crs,
|
|
width,
|
|
height,
|
|
entries)
|
|
|
|
res = calc.processCalculation(feedback)
|
|
if res == QgsRasterCalculator.ParserError:
|
|
raise QgsProcessingException(self.tr("Error parsing formula"))
|
|
|
|
return {self.OUTPUT: output}
|
|
|
|
def processBeforeAddingToModeler(self, algorithm, model):
|
|
values = []
|
|
expression = algorithm.params[self.EXPRESSION]
|
|
for i in list(model.inputs.values()):
|
|
param = i.param
|
|
if isinstance(param, QgsProcessingParameterRasterLayer) and "{}@".format(param.name) in expression:
|
|
values.append(ValueFromInput(param.name()))
|
|
|
|
if algorithm.name:
|
|
dependent = model.getDependentAlgorithms(algorithm.name)
|
|
else:
|
|
dependent = []
|
|
for alg in list(model.algs.values()):
|
|
if alg.modeler_name not in dependent:
|
|
for out in alg.algorithm.outputs:
|
|
if (isinstance(out, QgsProcessingOutputRasterLayer) and
|
|
"{}:{}@".format(alg.modeler_name, out.name) in expression):
|
|
values.append(ValueFromOutput(alg.modeler_name, out.name))
|
|
|
|
algorithm.params[self.LAYERS] = values
|
|
|
|
def mappedNameToLayer(self, lyr, expression, layersDict, context):
|
|
'''Try to identify if a real layer is mapped in the expression with a symbolic name.'''
|
|
|
|
nameToMap = lyr.source()
|
|
|
|
# check if nameToMap is a file
|
|
# TODO: what about URI eg for a COG?
|
|
if os.path.isfile(nameToMap):
|
|
# get only the name without extension and path of the file
|
|
nameToMap = os.path.splitext(os.path.basename(nameToMap))[0]
|
|
|
|
# check for layers directly added in the expression
|
|
if (nameToMap + "@") in expression:
|
|
layersDict[nameToMap] = lyr
|
|
|
|
# get "algorithm_inputs" scope of the expressionContext related
|
|
# with mapped variables
|
|
indexOfScope = context.expressionContext().indexOfScope("algorithm_inputs")
|
|
if indexOfScope >= 0:
|
|
expContextAlgInputsScope = context.expressionContext().scope(indexOfScope)
|
|
|
|
# check for the layers that are mapped as input in a model
|
|
# to do this check in the latest scope all passed variables
|
|
# to look for a variable that is a layer or a string filename ç
|
|
# to a layer
|
|
varDescription = None
|
|
for varName in expContextAlgInputsScope.variableNames():
|
|
|
|
layerInContext = expContextAlgInputsScope.variable(varName)
|
|
|
|
if not isinstance(layerInContext, str) and not isinstance(layerInContext, QgsMapLayer):
|
|
continue
|
|
|
|
if isinstance(layerInContext, QgsMapLayer) and nameToMap not in layerInContext.source():
|
|
continue
|
|
|
|
varDescription = expContextAlgInputsScope.description(varName)
|
|
|
|
# because there can be variable with None or "" description
|
|
# then skip them
|
|
if not varDescription:
|
|
continue
|
|
|
|
# check if it's description starts with Output as in:
|
|
# Output 'Output' from algorithm 'calc1'
|
|
# as set in https://github.com/qgis/QGIS/blob/master/src/core/processing/models/qgsprocessingmodelalgorithm.cpp#L516
|
|
# but var in expression is called simply
|
|
# 'Output' from algorithm 'calc1'
|
|
|
|
# get the translatin string to use to parse the description
|
|
# HAVE to use the same translated string as in
|
|
# https://github.com/qgis/QGIS/blob/master/src/core/processing/models/qgsprocessingmodelalgorithm.cpp#L516
|
|
translatedDesc = self.tr("Output '%1' from algorithm '%2'")
|
|
elementZero = translatedDesc.split(" ")[0] # For english the string result should be "Output"
|
|
|
|
elements = varDescription.split(" ")
|
|
if len(elements) > 1 and elements[0] == elementZero:
|
|
# remove heading QObject.tr"Output ") string. Note adding a space at the end of elementZero!
|
|
varDescription = varDescription[len(elementZero) + 1:]
|
|
|
|
# check if cleaned varDescription is present in the expression
|
|
# if not skip it
|
|
if (varDescription + "@") not in expression:
|
|
continue
|
|
|
|
# !!!found!!! => substitute in expression
|
|
# and add in the list of layers that will be passed to raster calculator
|
|
nameToMap = varName
|
|
new = "{}@".format(nameToMap)
|
|
old = "{}@".format(varDescription)
|
|
expression = expression.replace(old, new)
|
|
|
|
layersDict[nameToMap] = lyr
|
|
|
|
# need return the modified expression because it's not a reference
|
|
return expression
|