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efd73a491f
includes better managing of crd and extent parameters in models, not requiring now the use of modeler-only lags
125 lines
4.8 KiB
Python
125 lines
4.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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VectorGridPolygons.py
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---------------------
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Date : September 2014
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Copyright : (C) 2014 by Alexander Bruy
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Email : alexander dot bruy 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__ = 'Alexander Bruy'
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__date__ = 'September 2014'
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__copyright__ = '(C) 2014, Alexander Bruy'
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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 math
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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 Qgis, QgsRectangle, QgsFields, QgsField, QgsFeature, QgsGeometry, QgsPoint, QgsWkbTypes
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from qgis.utils import iface
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterExtent
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from processing.core.parameters import ParameterNumber
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class VectorGridPolygons(GeoAlgorithm):
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EXTENT = 'EXTENT'
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STEP_X = 'STEP_X'
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STEP_Y = 'STEP_Y'
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OUTPUT = 'OUTPUT'
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def getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'vector_grid.png'))
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Vector grid (polygons)')
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self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
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self.addParameter(ParameterExtent(self.EXTENT,
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self.tr('Grid extent'), optional=False))
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self.addParameter(ParameterNumber(self.STEP_X,
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self.tr('X spacing'), 0.0, 1000000000.0, 0.0001))
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self.addParameter(ParameterNumber(self.STEP_Y,
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self.tr('Y spacing'), 0.0, 1000000000.0, 0.0001))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Grid'), datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
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def processAlgorithm(self, progress):
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extent = self.getParameterValue(self.EXTENT).split(',')
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xSpace = self.getParameterValue(self.STEP_X)
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ySpace = self.getParameterValue(self.STEP_Y)
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bbox = QgsRectangle(float(extent[0]), float(extent[2]),
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float(extent[1]), float(extent[3]))
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mapCRS = iface.mapCanvas().mapSettings().destinationCrs()
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fields = QgsFields()
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fields.append(QgsField('id', QVariant.Int, '', 10, 0))
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fields.append(QgsField('xmin', QVariant.Double, '', 24, 15))
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fields.append(QgsField('xmax', QVariant.Double, '', 24, 15))
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fields.append(QgsField('ymin', QVariant.Double, '', 24, 15))
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fields.append(QgsField('ymax', QVariant.Double, '', 24, 15))
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fieldCount = 5
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fields, QgsWkbTypes.Polygon, mapCRS)
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feat = QgsFeature()
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feat.initAttributes(fieldCount)
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feat.setFields(fields)
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geom = QgsGeometry()
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idVar = 0
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# counters for progressbar - update every 5%
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count = 0
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count_max = (bbox.yMaximum() - bbox.yMinimum()) / ySpace
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count_update = count_max * 0.05
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y = bbox.yMaximum()
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while y >= bbox.yMinimum():
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x = bbox.xMinimum()
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while x <= bbox.xMaximum():
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pt1 = QgsPoint(x, y)
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pt2 = QgsPoint(x + xSpace, y)
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pt3 = QgsPoint(x + xSpace, y - ySpace)
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pt4 = QgsPoint(x, y - ySpace)
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pt5 = QgsPoint(x, y)
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polygon = [[pt1, pt2, pt3, pt4, pt5]]
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feat.setGeometry(geom.fromPolygon(polygon))
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feat.setAttribute(0, idVar)
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feat.setAttribute(1, x)
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feat.setAttribute(2, x + xSpace)
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feat.setAttribute(3, y - ySpace)
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feat.setAttribute(4, y)
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writer.addFeature(feat)
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idVar += 1
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x = x + xSpace
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y = y - ySpace
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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progress.setPercentage(int(count / count_max * 100))
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del writer
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