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772b769403
Condenses the duplicate grid algorithms into single algorithms (one for line, one for polygon), taking the best bits from both and adding tests
137 lines
5.0 KiB
Python
137 lines
5.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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VectorGridLines.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 VectorGridLines(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 __init__(self):
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GeoAlgorithm.__init__(self)
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# this algorithm is deprecated - use GridLine instead
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self.showInToolbox = False
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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 (lines)')
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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_LINE]))
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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('coord', QVariant.Double, '', 24, 15))
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fieldCount = 2
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fields, QgsWkbTypes.LineString, 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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count = 0
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count_max = (bbox.yMaximum() - bbox.yMinimum()) / ySpace
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count_update = count_max * 0.10
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y = bbox.yMaximum()
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while y >= bbox.yMinimum():
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pt1 = QgsPoint(bbox.xMinimum(), y)
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pt2 = QgsPoint(bbox.xMaximum(), y)
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line = [pt1, pt2]
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feat.setGeometry(geom.fromPolyline(line))
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feat.setAttribute(0, idVar)
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feat.setAttribute(1, y)
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writer.addFeature(feat)
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y = y - ySpace
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idVar += 1
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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 * 50))
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progress.setPercentage(50)
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# counters for progressbar - update every 5%
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count = 0
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count_max = (bbox.xMaximum() - bbox.xMinimum()) / xSpace
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count_update = count_max * 0.10
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x = bbox.xMinimum()
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while x <= bbox.xMaximum():
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pt1 = QgsPoint(x, bbox.yMaximum())
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pt2 = QgsPoint(x, bbox.yMinimum())
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line = [pt1, pt2]
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feat.setGeometry(geom.fromPolyline(line))
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feat.setAttribute(0, idVar)
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feat.setAttribute(1, x)
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writer.addFeature(feat)
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x = x + xSpace
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idVar += 1
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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progress.setPercentage(50 + int(count / count_max * 50))
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del writer
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