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142 lines
4.6 KiB
Python
142 lines
4.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ExtentFromLayer.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf 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__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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.PyQt.QtGui import QIcon
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from qgis.PyQt.QtCore import QVariant
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from qgis.core import (QgsApplication,
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QgsField,
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QgsFeatureSink,
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QgsGeometry,
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QgsFeature,
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QgsWkbTypes,
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QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterMapLayer,
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QgsProcessingParameterFeatureSink,
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QgsFields)
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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 ExtentFromLayer(QgisAlgorithm):
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INPUT = 'INPUT'
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BY_FEATURE = 'BY_FEATURE'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QgsApplication.getThemeIcon("/algorithms/mAlgorithmExtractLayerExtent.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("/algorithms/mAlgorithmExtractLayerExtent.svg")
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def tags(self):
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return self.tr('polygon,from,vector,raster,extent,envelope,bounds,bounding,boundary,layer').split(',')
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def group(self):
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return self.tr('Layer tools')
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def groupId(self):
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return 'layertools'
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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(QgsProcessingParameterMapLayer(self.INPUT, self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Extent'), type=QgsProcessing.TypeVectorPolygon))
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def name(self):
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return 'polygonfromlayerextent'
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def displayName(self):
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return self.tr('Extract layer extent')
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def processAlgorithm(self, parameters, context, feedback):
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layer = self.parameterAsLayer(parameters, self.INPUT, context)
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fields = QgsFields()
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fields.append(QgsField('MINX', QVariant.Double))
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fields.append(QgsField('MINY', QVariant.Double))
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fields.append(QgsField('MAXX', QVariant.Double))
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fields.append(QgsField('MAXY', QVariant.Double))
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fields.append(QgsField('CNTX', QVariant.Double))
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fields.append(QgsField('CNTY', QVariant.Double))
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fields.append(QgsField('AREA', QVariant.Double))
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fields.append(QgsField('PERIM', QVariant.Double))
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fields.append(QgsField('HEIGHT', QVariant.Double))
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fields.append(QgsField('WIDTH', QVariant.Double))
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, QgsWkbTypes.Polygon, layer.crs())
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if sink is None:
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raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
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try:
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# may not be possible
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layer.updateExtents()
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except:
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pass
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rect = layer.extent()
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geometry = QgsGeometry.fromRect(rect)
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minx = rect.xMinimum()
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miny = rect.yMinimum()
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maxx = rect.xMaximum()
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maxy = rect.yMaximum()
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height = rect.height()
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width = rect.width()
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cntx = minx + width / 2.0
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cnty = miny + height / 2.0
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area = width * height
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perim = 2 * width + 2 * height
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feat = QgsFeature()
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feat.setGeometry(geometry)
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attrs = [
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minx,
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miny,
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maxx,
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maxy,
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cntx,
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cnty,
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area,
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perim,
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height,
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width,
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]
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feat.setAttributes(attrs)
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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return {self.OUTPUT: dest_id}
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