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214 lines
8.2 KiB
Python
214 lines
8.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Grid.py
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---------------------
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Date : May 2010
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Copyright : (C) 2010 by Michael Minn
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Email : pyqgis at michaelminn 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__ = 'Michael Minn'
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__date__ = 'May 2010'
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__copyright__ = '(C) 2010, Michael Minn'
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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 (QgsRectangle,
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QgsCoordinateReferenceSystem,
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QgsField,
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QgsFeatureSink,
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QgsFeature,
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QgsGeometry,
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QgsPoint,
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QgsLineString,
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QgsWkbTypes,
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QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterEnum,
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QgsProcessingParameterExtent,
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QgsProcessingParameterNumber,
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QgsProcessingParameterCrs,
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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 GridLine(QgisAlgorithm):
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EXTENT = 'EXTENT'
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HSPACING = 'HSPACING'
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VSPACING = 'VSPACING'
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HOVERLAY = 'HOVERLAY'
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VOVERLAY = 'VOVERLAY'
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CRS = 'CRS'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'vector_grid.png'))
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def tags(self):
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return self.tr('grid,lines,vector,create,fishnet').split(',')
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def group(self):
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return self.tr('Vector creation')
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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(QgsProcessingParameterExtent(self.EXTENT, self.tr('Grid extent')))
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self.addParameter(QgsProcessingParameterNumber(self.HSPACING,
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self.tr('Horizontal spacing'), QgsProcessingParameterNumber.Double,
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0.0001, False, 0, 1000000000.0))
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self.addParameter(QgsProcessingParameterNumber(self.VSPACING,
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self.tr('Vertical spacing'), QgsProcessingParameterNumber.Double,
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0.0001, False, 0, 1000000000.0))
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self.addParameter(QgsProcessingParameterNumber(self.HOVERLAY,
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self.tr('Horizontal overlay'), QgsProcessingParameterNumber.Double,
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0.0, False, 0, 1000000000.0))
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self.addParameter(QgsProcessingParameterNumber(self.VOVERLAY,
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self.tr('Vertical overlay'), QgsProcessingParameterNumber.Double,
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0.0, False, 0, 1000000000.0))
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self.addParameter(QgsProcessingParameterCrs(self.CRS, 'Grid CRS', 'ProjectCrs'))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Grid'), type=QgsProcessing.TypeVectorLine))
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def name(self):
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return 'creategridlines'
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def displayName(self):
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return self.tr('Create grid (lines)')
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def processAlgorithm(self, parameters, context, feedback):
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hSpacing = self.parameterAsDouble(parameters, self.HSPACING, context)
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vSpacing = self.parameterAsDouble(parameters, self.VSPACING, context)
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hOverlay = self.parameterAsDouble(parameters, self.HOVERLAY, context)
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vOverlay = self.parameterAsDouble(parameters, self.VOVERLAY, context)
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crs = self.parameterAsCrs(parameters, self.CRS, context)
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bbox = self.parameterAsExtent(parameters, self.EXTENT, context, crs)
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width = bbox.width()
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height = bbox.height()
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if hSpacing <= 0 or vSpacing <= 0:
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raise QgsProcessingException(
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self.tr('Invalid grid spacing: {0}/{1}').format(hSpacing, vSpacing))
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if hSpacing <= hOverlay or vSpacing <= vOverlay:
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raise QgsProcessingException(
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self.tr('Invalid overlay: {0}/{1}').format(hOverlay, vOverlay))
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if width < hSpacing:
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raise QgsProcessingException(
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self.tr('Horizontal spacing is too small for the covered area'))
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if height < vSpacing:
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raise QgsProcessingException(
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self.tr('Vertical spacing is too small for the covered area'))
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fields = QgsFields()
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fields.append(QgsField('left', QVariant.Double, '', 24, 16))
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fields.append(QgsField('top', QVariant.Double, '', 24, 16))
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fields.append(QgsField('right', QVariant.Double, '', 24, 16))
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fields.append(QgsField('bottom', QVariant.Double, '', 24, 16))
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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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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, QgsWkbTypes.LineString, crs)
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if hOverlay > 0:
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hSpace = [hSpacing - hOverlay, hOverlay]
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else:
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hSpace = [hSpacing, hSpacing]
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if vOverlay > 0:
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vSpace = [vSpacing - vOverlay, vOverlay]
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else:
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vSpace = [vSpacing, vSpacing]
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feat = QgsFeature()
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feat.initAttributes(len(fields))
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count = 0
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id = 1
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# latitude lines
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count_max = height / vSpacing
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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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if feedback.isCanceled():
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break
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pt1 = QgsPoint(bbox.xMinimum(), y)
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pt2 = QgsPoint(bbox.xMaximum(), y)
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line = QgsLineString()
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line.setPoints([pt1, pt2])
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feat.setGeometry(QgsGeometry(line))
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feat.setAttributes([bbox.xMinimum(),
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y,
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bbox.xMaximum(),
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y,
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id,
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y])
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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y = y - vSpace[count % 2]
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id += 1
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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feedback.setProgress(int(count / count_max * 50))
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feedback.setProgress(50)
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# longitude lines
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# counters for progressbar - update every 5%
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count = 0
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count_max = width / hSpacing
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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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if feedback.isCanceled():
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break
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pt1 = QgsPoint(x, bbox.yMaximum())
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pt2 = QgsPoint(x, bbox.yMinimum())
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line = QgsLineString()
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line.setPoints([pt1, pt2])
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feat.setGeometry(QgsGeometry(line))
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feat.setAttributes([x,
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bbox.yMaximum(),
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x,
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bbox.yMinimum(),
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id,
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x])
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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x = x + hSpace[count % 2]
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id += 1
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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feedback.setProgress(50 + int(count / count_max * 50))
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return {self.OUTPUT: dest_id}
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