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155 lines
5.1 KiB
Python
155 lines
5.1 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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from PyQt4.QtCore import *
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from qgis.core import *
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterBoolean
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class ExtentFromLayer(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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BY_FEATURE = 'BY_FEATURE'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name = 'Polygon from layer extent'
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self.group = 'Vector general tools'
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterBoolean(self.BY_FEATURE,
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self.tr('Calculate extent for each feature separately'), False))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Output layer')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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byFeature = self.getParameterValue(self.BY_FEATURE)
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fields = [
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QgsField('MINX', QVariant.Double),
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QgsField('MINY', QVariant.Double),
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QgsField('MAXX', QVariant.Double),
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QgsField('MAXY', QVariant.Double),
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QgsField('CNTX', QVariant.Double),
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QgsField('CNTY', QVariant.Double),
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QgsField('AREA', QVariant.Double),
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QgsField('PERIM', QVariant.Double),
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QgsField('HEIGHT', QVariant.Double),
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QgsField('WIDTH', QVariant.Double),
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]
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
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QGis.WKBPolygon, layer.crs())
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if byFeature:
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self.featureExtent(layer, writer, progress)
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else:
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self.layerExtent(layer, writer, progress)
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del writer
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def layerExtent(self, layer, writer, progress):
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rect = layer.extent()
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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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rect = [QgsPoint(minx, miny), QgsPoint(minx, maxy), QgsPoint(maxx,
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maxy), QgsPoint(maxx, miny), QgsPoint(minx, miny)]
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geometry = QgsGeometry().fromPolygon([rect])
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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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writer.addFeature(feat)
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def featureExtent(self, layer, writer, progress):
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current = 0
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features = vector.features(layer)
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total = 100.0 / float(len(features))
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feat = QgsFeature()
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for f in features:
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rect = f.geometry().boundingBox()
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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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rect = [QgsPoint(minx, miny), QgsPoint(minx, maxy), QgsPoint(maxx,
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maxy), QgsPoint(maxx, miny), QgsPoint(minx, miny)]
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geometry = QgsGeometry().fromPolygon([rect])
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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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writer.addFeature(feat)
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current += 1
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progress.setPercentage(int(current * total))
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