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162 lines
6.3 KiB
Python
162 lines
6.3 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 sextante.core.GeoAlgorithm import GeoAlgorithm
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from sextante.core.QGisLayers import QGisLayers
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from sextante.parameters.ParameterVector import ParameterVector
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from sextante.parameters.ParameterBoolean import ParameterBoolean
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from sextante.outputs.OutputVector import OutputVector
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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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#===========================================================================
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# def getIcon(self):
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# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/layer_extent.png")
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#===========================================================================
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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, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
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self.addParameter(ParameterBoolean(self.BY_FEATURE, "Calculate extent for each feature separately", False))
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self.addOutput(OutputVector(self.OUTPUT, "Output layer"))
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def processAlgorithm(self, progress):
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layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER))
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byFeature = self.getParameterValue(self.BY_FEATURE)
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fields = {0 : QgsField("MINX", QVariant.Double),
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1 : QgsField("MINY", QVariant.Double),
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2 : QgsField("MAXX", QVariant.Double),
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3 : QgsField("MAXY", QVariant.Double),
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4 : QgsField("CNTX", QVariant.Double),
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5 : QgsField("CNTY", QVariant.Double),
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6 : QgsField("AREA", QVariant.Double),
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7 : QgsField("PERIM", QVariant.Double),
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8 : QgsField("HEIGHT", QVariant.Double),
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9 : 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),
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QgsPoint(minx, maxy),
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QgsPoint(maxx, maxy),
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QgsPoint(maxx, miny),
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QgsPoint(minx, miny)
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]
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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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feat.setAttributeMap({0 : QVariant(minx),
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1 : QVariant(miny),
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2 : QVariant(maxx),
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3 : QVariant(maxy),
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4 : QVariant(cntx),
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5 : QVariant(cnty),
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6 : QVariant(area),
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7 : QVariant(perim),
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8 : QVariant(height),
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9 : QVariant(width)
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})
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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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outFeat = QgsFeature()
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provider = layer.dataProvider()
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provider.select()
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features = QGisLayers.features(layer)
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total = 100.0 / float(len(features))
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for inFeat in features:
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rect = inFeat.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),
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QgsPoint(minx, maxy),
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QgsPoint(maxx, maxy),
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QgsPoint(maxx, miny),
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QgsPoint(minx, miny)
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]
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geometry = QgsGeometry().fromPolygon([rect])
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outFeat.setGeometry(geometry)
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outFeat.setAttributeMap({0 : QVariant(minx),
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1 : QVariant(miny),
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2 : QVariant(maxx),
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3 : QVariant(maxy),
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4 : QVariant(cntx),
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5 : QVariant(cnty),
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6 : QVariant(area),
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7 : QVariant(perim),
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8 : QVariant(height),
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9 : QVariant(width)
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})
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writer.addFeature(outFeat)
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current += 1
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progress.setPercentage(int(current * total))
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