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137 lines
5.1 KiB
Python
137 lines
5.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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FindProjection.py
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-----------------
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Date : February 2017
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Copyright : (C) 2017 by Nyall Dawson
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Email : nyall dot dawson at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Nyall Dawson'
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__date__ = 'February 2017'
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__copyright__ = '(C) 2017, Nyall Dawson'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import os
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from qgis.core import (QgsGeometry,
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QgsFeature,
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QgsFeatureSink,
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QgsField,
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QgsFields,
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QgsCoordinateReferenceSystem,
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QgsCoordinateTransform,
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QgsWkbTypes,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterExtent,
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QgsProcessingParameterCrs,
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QgsProcessingParameterFeatureSink)
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from qgis.PyQt.QtCore import QVariant
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class FindProjection(QgisAlgorithm):
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INPUT = 'INPUT'
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TARGET_AREA = 'TARGET_AREA'
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TARGET_AREA_CRS = 'TARGET_AREA_CRS'
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OUTPUT = 'OUTPUT'
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def tags(self):
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return self.tr('crs,srs,coordinate,reference,system,guess,estimate,finder,determine').split(',')
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def group(self):
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return self.tr('Vector general')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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extent_parameter = QgsProcessingParameterExtent(self.TARGET_AREA,
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self.tr('Target area for layer'))
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#extent_parameter.skip_crs_check = True
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self.addParameter(extent_parameter)
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self.addParameter(QgsProcessingParameterCrs(self.TARGET_AREA_CRS, 'Target area CRS'))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT,
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self.tr('CRS candidates')))
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def name(self):
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return 'findprojection'
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def displayName(self):
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return self.tr('Find projection')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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extent = self.parameterAsExtent(parameters, self.TARGET_AREA, context)
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target_crs = self.parameterAsCrs(parameters, self.TARGET_AREA_CRS, context)
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target_geom = QgsGeometry.fromRect(extent)
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fields = QgsFields()
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fields.append(QgsField('auth_id', QVariant.String, '', 20))
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, QgsWkbTypes.NoGeometry, QgsCoordinateReferenceSystem())
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# make intersection tests nice and fast
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engine = QgsGeometry.createGeometryEngine(target_geom.constGet())
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engine.prepareGeometry()
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layer_bounds = QgsGeometry.fromRect(source.sourceExtent())
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crses_to_check = QgsCoordinateReferenceSystem.validSrsIds()
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total = 100.0 / len(crses_to_check)
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found_results = 0
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for current, srs_id in enumerate(crses_to_check):
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if feedback.isCanceled():
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break
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candidate_crs = QgsCoordinateReferenceSystem.fromSrsId(srs_id)
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if not candidate_crs.isValid():
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continue
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transform_candidate = QgsCoordinateTransform(candidate_crs, target_crs)
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transformed_bounds = QgsGeometry(layer_bounds)
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try:
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if not transformed_bounds.transform(transform_candidate) == 0:
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continue
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except:
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continue
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if engine.intersects(transformed_bounds.constGet()):
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feedback.pushInfo(self.tr('Found candidate CRS: {}').format(candidate_crs.authid()))
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f = QgsFeature(fields)
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f.setAttributes([candidate_crs.authid()])
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sink.addFeature(f, QgsFeatureSink.FastInsert)
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found_results += 1
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feedback.setProgress(int(current * total))
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if found_results == 0:
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feedback.reportError(self.tr('No matching projections found'))
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return {self.OUTPUT: dest_id}
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