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| 1 | +# -*- coding: utf-8 -*- |
| 2 | + |
| 3 | +""" |
| 4 | +*************************************************************************** |
| 5 | + Gridify.py |
| 6 | + --------------------- |
| 7 | + Date : May 2010 |
| 8 | + Copyright : (C) 2010 by Michael Minn |
| 9 | + Email : pyqgis at michaelminn dot com |
| 10 | +*************************************************************************** |
| 11 | +* * |
| 12 | +* This program is free software; you can redistribute it and/or modify * |
| 13 | +* it under the terms of the GNU General Public License as published by * |
| 14 | +* the Free Software Foundation; either version 2 of the License, or * |
| 15 | +* (at your option) any later version. * |
| 16 | +* * |
| 17 | +*************************************************************************** |
| 18 | +""" |
| 19 | + |
| 20 | +__author__ = 'Michael Minn' |
| 21 | +__date__ = 'May 2010' |
| 22 | +__copyright__ = '(C) 2010, Michael Minn' |
| 23 | + |
| 24 | +# This will get replaced with a git SHA1 when you do a git archive |
| 25 | + |
| 26 | +__revision__ = '$Format:%H$' |
| 27 | + |
| 28 | +from PyQt4.QtCore import * |
| 29 | +from qgis.core import * |
| 30 | +from processing.core.GeoAlgorithm import GeoAlgorithm |
| 31 | +from processing.core.GeoAlgorithmExecutionException import \ |
| 32 | + GeoAlgorithmExecutionException |
| 33 | +from processing.core.ProcessingLog import ProcessingLog |
| 34 | +from processing.core.parameters import ParameterVector |
| 35 | +from processing.core.parameters import ParameterNumber |
| 36 | +from processing.core.outputs import OutputVector |
| 37 | + |
| 38 | +from processing.tools import dataobjects, vector |
| 39 | + |
| 40 | +class Gridify(GeoAlgorithm): |
| 41 | + INPUT = 'INPUT' |
| 42 | + HSPACING = 'HSPACING' |
| 43 | + VSPACING = 'VSPACING' |
| 44 | + OUTPUT = 'OUTPUT' |
| 45 | + |
| 46 | + def defineCharacteristics(self): |
| 47 | + self.name = 'Snap points to grid' |
| 48 | + self.group = 'Vector general tools' |
| 49 | + |
| 50 | + self.addParameter(ParameterVector( |
| 51 | + self.INPUT, 'Input Layer', [ParameterVector.VECTOR_TYPE_ANY])) |
| 52 | + self.addParameter(ParameterNumber( |
| 53 | + self.HSPACING, 'Horizontal spacing', default=0.1)) |
| 54 | + self.addParameter(ParameterNumber( |
| 55 | + self.VSPACING, 'Vertical spacing', default=0.1)) |
| 56 | + |
| 57 | + self.addOutput(OutputVector(self.OUTPUT, 'Output')) |
| 58 | + |
| 59 | + def processAlgorithm(self, progress): |
| 60 | + layer = dataobjects.getObjectFromUri( |
| 61 | + self.getParameterValue(self.INPUT)) |
| 62 | + hSpacing = self.getParameterValue(self.HSPACING) |
| 63 | + vSpacing = self.getParameterValue(self.VSPACING) |
| 64 | + |
| 65 | + if hSpacing <= 0 or vSpacing <= 0: |
| 66 | + raise GeoAlgorithmExecutionException( |
| 67 | + 'Invalid grid spacing: %s/%s' % (hSpacing, vSpacing)) |
| 68 | + |
| 69 | + writer = self.getOutputFromName(self.OUTPUT).getVectorWriter( |
| 70 | + layer.pendingFields(), layer.wkbType(), layer.crs()) |
| 71 | + |
| 72 | + features = vector.features(layer) |
| 73 | + |
| 74 | + count = len(features) |
| 75 | + total = 100.0 / float(count) |
| 76 | + |
| 77 | + for count, f in enumerate(features): |
| 78 | + geom = f.geometry() |
| 79 | + geomType = geom.wkbType() |
| 80 | + |
| 81 | + if geomType == QGis.WKBPoint: |
| 82 | + points = self._gridify([geom.asPoint()], hSpacing, vSpacing) |
| 83 | + newGeom = QgsGeometry.fromPoint(points[0]) |
| 84 | + elif geomType == QGis.WKBMultiPoint: |
| 85 | + points = self._gridify(geom.aMultiPoint(), hSpacing, vSpacing) |
| 86 | + newGeom = QgsGeometry.fromMultiPoint(points) |
| 87 | + elif geomType == QGis.WKBLineString: |
| 88 | + points = self._gridify(geom.asPolyline(), hSpacing, vSpacing) |
| 89 | + if len(points) < 2: |
| 90 | + ProcessingLog.addToLog(Processing.LOG_INFO, |
| 91 | + 'Failed to gridify feature with FID %s' % f.id()) |
| 92 | + newGeom = None |
| 93 | + else: |
| 94 | + newGeom = QgsGeometry.fromPolyline(points) |
| 95 | + elif geomType == QGis.WKBMultiLineString: |
| 96 | + polyline = [] |
| 97 | + for line in geom.asMultiPolyline(): |
| 98 | + points = self._gridify(line, hSpacing, vSpacing) |
| 99 | + if len(points) > 1: |
| 100 | + polyline.append(points) |
| 101 | + if len(polyline) <= 0: |
| 102 | + ProcessingLog.addToLog(Processing.LOG_INFO, |
| 103 | + 'Failed to gridify feature with FID %s' % f.id()) |
| 104 | + newGeom = None |
| 105 | + else: |
| 106 | + newGeom = QgsGeometry.fromMultiPolyline(polyline) |
| 107 | + |
| 108 | + elif geomType == QGis.WKBPolygon: |
| 109 | + polygon = [] |
| 110 | + for line in geom.asPolygon(): |
| 111 | + points = self._gridify(line, hSpacing, vSpacing) |
| 112 | + if len(points) > 1: |
| 113 | + polygon.append(points) |
| 114 | + if len(polygon) <= 0: |
| 115 | + ProcessingLog.addToLog(Processing.LOG_INFO, |
| 116 | + 'Failed to gridify feature with FID %s' % f.id()) |
| 117 | + newGeom = None |
| 118 | + else: |
| 119 | + newGeom = QgsGeometry.fromPolygon(polygon) |
| 120 | + elif geomType == QGis.WKBMultiPolygon: |
| 121 | + multipolygon = [] |
| 122 | + for polygon in geometry.asMultiPolygon(): |
| 123 | + newPolygon = [] |
| 124 | + for line in polygon: |
| 125 | + points = self._gridify(line, hSpacing, vSpacing) |
| 126 | + if len(points) > 2: |
| 127 | + newPolygon.append(points) |
| 128 | + |
| 129 | + if len(newPolygon) > 0: |
| 130 | + multipolygon.append(newPolygon) |
| 131 | + |
| 132 | + if len(multipolygon) <= 0: |
| 133 | + ProcessingLog.addToLog(Processing.LOG_INFO, |
| 134 | + 'Failed to gridify feature with FID %s' % f.id()) |
| 135 | + newGeom = None |
| 136 | + else: |
| 137 | + newGeom = QgsGeometry.fromMultiPolygon(multipolygon) |
| 138 | + |
| 139 | + if newGeom is not None: |
| 140 | + feat = QgsFeature() |
| 141 | + feat.setGeometry(newGeom) |
| 142 | + feat.setAttributes(f.attributes()) |
| 143 | + writer.addFeature(feat) |
| 144 | + |
| 145 | + progress.setPercentage(int(count * total)) |
| 146 | + |
| 147 | + del writer |
| 148 | + |
| 149 | + def _gridify(self, points, hSpacing, vSpacing): |
| 150 | + nPoints = [] |
| 151 | + for p in points: |
| 152 | + nPoints.append(QgsPoint(round(p.x() / hSpacing, 0) * hSpacing, |
| 153 | + round(p.y() / vSpacing, 0) * vSpacing)) |
| 154 | + |
| 155 | + i = 0 |
| 156 | + # Delete overlapping points |
| 157 | + while i < len(nPoints) - 2: |
| 158 | + if nPoints[i] == nPoints[i + 1]: |
| 159 | + nPoints.pop(i + 1) |
| 160 | + else: |
| 161 | + i += 1 |
| 162 | + |
| 163 | + i = 0 |
| 164 | + # Delete line points that go out and return to the same place |
| 165 | + while i < len(nPoints) - 3: |
| 166 | + if nPoints[i] == nPoints[i + 2]: |
| 167 | + nPoints.pop(i + 1) |
| 168 | + nPoints.pop(i + 1) |
| 169 | + |
| 170 | + # Step back to catch arcs |
| 171 | + if i > 0: |
| 172 | + i -= 1 |
| 173 | + else: |
| 174 | + i += 1 |
| 175 | + |
| 176 | + i = 0 |
| 177 | + # Delete overlapping start/end points |
| 178 | + while len(nPoints) > 1 and nPoints[0] == nPoints[len(nPoints) - 1]: |
| 179 | + nPoints.pop(len(nPoints) - 1) |
| 180 | + |
| 181 | + return nPoints |
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