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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
128 lines
4.8 KiB
Python
128 lines
4.8 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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import codecs
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from qgis.core import (QgsApplication,
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QgsGeometry,
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QgsFeatureSink,
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QgsRectangle,
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QgsCoordinateReferenceSystem,
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QgsCoordinateTransform,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterCrs
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from processing.core.parameters import ParameterExtent
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from processing.core.outputs import OutputHTML
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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_LAYER = 'INPUT_LAYER'
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TARGET_AREA = 'TARGET_AREA'
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TARGET_AREA_CRS = 'TARGET_AREA_CRS'
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OUTPUT_HTML_FILE = 'OUTPUT_HTML_FILE'
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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 tools')
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def __init__(self):
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super().__init__()
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer')))
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extent_parameter = ParameterExtent(self.TARGET_AREA,
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self.tr('Target area for layer'),
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self.INPUT_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(ParameterCrs(self.TARGET_AREA_CRS, 'Target area CRS'))
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self.addOutput(OutputHTML(self.OUTPUT_HTML_FILE,
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self.tr('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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layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
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extent = self.getParameterValue(self.TARGET_AREA).split(',')
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if not extent:
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extent = QgsProcessingUtils.combineLayerExtents([layer])
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target_crs = QgsCoordinateReferenceSystem(self.getParameterValue(self.TARGET_AREA_CRS))
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target_geom = QgsGeometry.fromRect(QgsRectangle(float(extent[0]), float(extent[2]),
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float(extent[1]), float(extent[3])))
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output_file = self.getOutputValue(self.OUTPUT_HTML_FILE)
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# make intersection tests nice and fast
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engine = QgsGeometry.createGeometryEngine(target_geom.geometry())
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engine.prepareGeometry()
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layer_bounds = QgsGeometry.fromRect(layer.extent())
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results = []
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for srs_id in QgsCoordinateReferenceSystem.validSrsIds():
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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.geometry()):
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results.append(candidate_crs.authid())
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self.createHTML(output_file, results)
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def createHTML(self, outputFile, candidates):
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with codecs.open(outputFile, 'w', encoding='utf-8') as f:
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f.write('<html><head>\n')
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f.write('<meta http-equiv="Content-Type" content="text/html; \
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charset=utf-8" /></head><body>\n')
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for c in candidates:
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f.write('<p>' + c + '</p>\n')
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f.write('</body></html>\n')
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