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ede452be85
Algorithms are now passed a QgsProcessingFeedback object instead of the loosely defined progress parameter.
178 lines
7.2 KiB
Python
178 lines
7.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Gridify.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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from qgis.core import Qgis, QgsGeometry, QgsFeature, QgsPoint, QgsWkbTypes
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.ProcessingLog import ProcessingLog
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from processing.core.parameters import ParameterVector
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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, vector
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class Gridify(GeoAlgorithm):
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INPUT = 'INPUT'
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HSPACING = 'HSPACING'
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VSPACING = 'VSPACING'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Snap points to grid')
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self.group, self.i18n_group = self.trAlgorithm('Vector general tools')
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input Layer')))
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self.addParameter(ParameterNumber(self.HSPACING,
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self.tr('Horizontal spacing'), default=0.1))
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self.addParameter(ParameterNumber(self.VSPACING,
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self.tr('Vertical spacing'), default=0.1))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Snapped')))
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def processAlgorithm(self, feedback):
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layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT))
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hSpacing = self.getParameterValue(self.HSPACING)
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vSpacing = self.getParameterValue(self.VSPACING)
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if hSpacing <= 0 or vSpacing <= 0:
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raise GeoAlgorithmExecutionException(
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self.tr('Invalid grid spacing: %s/%s' % (hSpacing, vSpacing)))
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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layer.fields(), layer.wkbType(), layer.crs())
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, f in enumerate(features):
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geom = f.geometry()
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geomType = geom.wkbType()
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if geomType == QgsWkbTypes.Point:
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points = self._gridify([geom.asPoint()], hSpacing, vSpacing)
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newGeom = QgsGeometry.fromPoint(points[0])
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elif geomType == QgsWkbTypes.MultiPoint:
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points = self._gridify(geom.aMultiPoint(), hSpacing, vSpacing)
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newGeom = QgsGeometry.fromMultiPoint(points)
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elif geomType == QgsWkbTypes.LineString:
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points = self._gridify(geom.asPolyline(), hSpacing, vSpacing)
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if len(points) < 2:
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ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
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self.tr('Failed to gridify feature with FID %s' % f.id()))
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newGeom = None
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else:
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newGeom = QgsGeometry.fromPolyline(points)
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elif geomType == QgsWkbTypes.MultiLineString:
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polyline = []
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for line in geom.asMultiPolyline():
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points = self._gridify(line, hSpacing, vSpacing)
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if len(points) > 1:
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polyline.append(points)
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if len(polyline) <= 0:
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ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
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self.tr('Failed to gridify feature with FID %s' % f.id()))
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newGeom = None
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else:
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newGeom = QgsGeometry.fromMultiPolyline(polyline)
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elif geomType == QgsWkbTypes.Polygon:
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polygon = []
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for line in geom.asPolygon():
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points = self._gridify(line, hSpacing, vSpacing)
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if len(points) > 1:
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polygon.append(points)
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if len(polygon) <= 0:
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ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
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self.tr('Failed to gridify feature with FID %s' % f.id()))
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newGeom = None
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else:
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newGeom = QgsGeometry.fromPolygon(polygon)
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elif geomType == QgsWkbTypes.MultiPolygon:
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multipolygon = []
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for polygon in geom.asMultiPolygon():
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newPolygon = []
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for line in polygon:
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points = self._gridify(line, hSpacing, vSpacing)
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if len(points) > 2:
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newPolygon.append(points)
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if len(newPolygon) > 0:
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multipolygon.append(newPolygon)
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if len(multipolygon) <= 0:
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ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
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self.tr('Failed to gridify feature with FID %s' % f.id()))
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newGeom = None
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else:
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newGeom = QgsGeometry.fromMultiPolygon(multipolygon)
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if newGeom is not None:
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feat = QgsFeature()
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feat.setGeometry(newGeom)
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feat.setAttributes(f.attributes())
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writer.addFeature(feat)
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feedback.setProgress(int(current * total))
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del writer
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def _gridify(self, points, hSpacing, vSpacing):
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nPoints = []
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for p in points:
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nPoints.append(QgsPoint(round(p.x() / hSpacing, 0) * hSpacing,
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round(p.y() / vSpacing, 0) * vSpacing))
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i = 0
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# Delete overlapping points
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while i < len(nPoints) - 2:
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if nPoints[i] == nPoints[i + 1]:
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nPoints.pop(i + 1)
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else:
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i += 1
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i = 0
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# Delete line points that go out and return to the same place
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while i < len(nPoints) - 3:
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if nPoints[i] == nPoints[i + 2]:
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nPoints.pop(i + 1)
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nPoints.pop(i + 1)
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# Step back to catch arcs
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if i > 0:
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i -= 1
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else:
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i += 1
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i = 0
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# Delete overlapping start/end points
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while len(nPoints) > 1 and nPoints[0] == nPoints[len(nPoints) - 1]:
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nPoints.pop(len(nPoints) - 1)
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return nPoints
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