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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
288 lines
12 KiB
Python
288 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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RectanglesOvalsDiamondsVariable.py
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---------------------
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Date : April 2016
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Copyright : (C) 2016 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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from builtins import range
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__author__ = 'Alexander Bruy'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive323
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__revision__ = '$Format:%H$'
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import math
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from qgis.core import (QgsApplication,
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QgsWkbTypes,
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QgsFeature,
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QgsGeometry,
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QgsPoint,
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QgsMessageLog,
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QgsProcessingUtils)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterSelection
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from processing.core.parameters import ParameterTableField
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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 RectanglesOvalsDiamondsVariable(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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SHAPE = 'SHAPE'
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WIDTH = 'WIDTH'
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HEIGHT = 'HEIGHT'
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ROTATION = 'ROTATION'
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SEGMENTS = 'SEGMENTS'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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def icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def group(self):
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return self.tr('Vector geometry tools')
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def name(self):
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return 'rectanglesovalsdiamondsvariable'
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def displayName(self):
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return self.tr('Rectangles, ovals, diamonds (variable)')
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def defineCharacteristics(self):
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self.shapes = [self.tr('Rectangles'), self.tr('Diamonds'), self.tr('Ovals')]
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'),
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[dataobjects.TYPE_VECTOR_POINT]))
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self.addParameter(ParameterSelection(self.SHAPE,
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self.tr('Buffer shape'), self.shapes))
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self.addParameter(ParameterTableField(self.WIDTH,
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self.tr('Width field'),
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self.INPUT_LAYER,
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ParameterTableField.DATA_TYPE_NUMBER))
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self.addParameter(ParameterTableField(self.HEIGHT,
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self.tr('Height field'),
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self.INPUT_LAYER,
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ParameterTableField.DATA_TYPE_NUMBER))
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self.addParameter(ParameterTableField(self.ROTATION,
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self.tr('Rotation field'),
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self.INPUT_LAYER,
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ParameterTableField.DATA_TYPE_NUMBER,
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True))
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self.addParameter(ParameterNumber(self.SEGMENTS,
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self.tr('Number of segments'),
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1,
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999999999,
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36))
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self.addOutput(OutputVector(self.OUTPUT_LAYER,
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self.tr('Output'),
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datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
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def processAlgorithm(self, context, feedback):
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
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shape = self.getParameterValue(self.SHAPE)
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width = self.getParameterValue(self.WIDTH)
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height = self.getParameterValue(self.HEIGHT)
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rotation = self.getParameterValue(self.ROTATION)
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segments = self.getParameterValue(self.SEGMENTS)
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writer = self.getOutputFromName(
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self.OUTPUT_LAYER).getVectorWriter(layer.fields().toList(), QgsWkbTypes.Polygon, layer.crs(), context)
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features = QgsProcessingUtils.getFeatures(layer, context)
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if shape == 0:
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self.rectangles(writer, features, width, height, rotation)
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elif shape == 1:
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self.diamonds(writer, features, width, height, rotation)
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else:
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self.ovals(writer, features, width, height, rotation, segments)
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del writer
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def rectangles(self, writer, features, width, height, rotation):
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ft = QgsFeature()
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if rotation is not None:
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for current, feat in enumerate(features):
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w = feat[width]
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h = feat[height]
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angle = feat[rotation]
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if not w or not h or not angle:
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QgsMessageLog.logMessage(self.tr('Feature {} has empty '
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'width, height or angle. '
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'Skipping...'.format(feat.id())),
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self.tr('Processing'), QgsMessageLog.WARNING)
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continue
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xOffset = w / 2.0
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yOffset = h / 2.0
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phi = angle * math.pi / 180
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point = feat.geometry().asPoint()
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x = point.x()
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y = point.y()
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points = [(-xOffset, -yOffset), (-xOffset, yOffset), (xOffset, yOffset), (xOffset, -yOffset)]
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polygon = [[QgsPoint(i[0] * math.cos(phi) + i[1] * math.sin(phi) + x,
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-i[0] * math.sin(phi) + i[1] * math.cos(phi) + y) for i in points]]
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ft.setGeometry(QgsGeometry.fromPolygon(polygon))
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ft.setAttributes(feat.attributes())
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writer.addFeature(ft)
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else:
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for current, feat in enumerate(features):
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w = feat[width]
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h = feat[height]
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if not w or not h:
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QgsMessageLog.logMessage(self.tr('Feature {} has empty '
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'width or height. '
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'Skipping...'.format(feat.id())),
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self.tr('Processing'), QgsMessageLog.WARNING)
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continue
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xOffset = w / 2.0
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yOffset = h / 2.0
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point = feat.geometry().asPoint()
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x = point.x()
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y = point.y()
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points = [(-xOffset, -yOffset), (-xOffset, yOffset), (xOffset, yOffset), (xOffset, -yOffset)]
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polygon = [[QgsPoint(i[0] + x, i[1] + y) for i in points]]
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ft.setGeometry(QgsGeometry.fromPolygon(polygon))
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ft.setAttributes(feat.attributes())
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writer.addFeature(ft)
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def diamonds(self, writer, features, width, height, rotation):
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ft = QgsFeature()
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if rotation is not None:
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for current, feat in enumerate(features):
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w = feat[width]
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h = feat[height]
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angle = feat[rotation]
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if not w or not h or not angle:
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QgsMessageLog.logMessage(self.tr('Feature {} has empty '
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'width, height or angle. '
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'Skipping...'.format(feat.id())),
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self.tr('Processing'), QgsMessageLog.WARNING)
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continue
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xOffset = w / 2.0
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yOffset = h / 2.0
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phi = angle * math.pi / 180
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point = feat.geometry().asPoint()
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x = point.x()
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y = point.y()
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points = [(0.0, -yOffset), (-xOffset, 0.0), (0.0, yOffset), (xOffset, 0.0)]
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polygon = [[QgsPoint(i[0] * math.cos(phi) + i[1] * math.sin(phi) + x,
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-i[0] * math.sin(phi) + i[1] * math.cos(phi) + y) for i in points]]
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ft.setGeometry(QgsGeometry.fromPolygon(polygon))
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ft.setAttributes(feat.attributes())
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writer.addFeature(ft)
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else:
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for current, feat in enumerate(features):
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w = feat[width]
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h = feat[height]
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if not w or not h:
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QgsMessageLog.logMessage(self.tr('Feature {} has empty '
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'width or height. '
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'Skipping...'.format(feat.id())),
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self.tr('Processing'), QgsMessageLog.WARNING)
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continue
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xOffset = w / 2.0
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yOffset = h / 2.0
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point = feat.geometry().asPoint()
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x = point.x()
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y = point.y()
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points = [(0.0, -yOffset), (-xOffset, 0.0), (0.0, yOffset), (xOffset, 0.0)]
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polygon = [[QgsPoint(i[0] + x, i[1] + y) for i in points]]
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ft.setGeometry(QgsGeometry.fromPolygon(polygon))
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ft.setAttributes(feat.attributes())
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writer.addFeature(ft)
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def ovals(self, writer, features, width, height, rotation, segments):
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ft = QgsFeature()
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if rotation is not None:
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for current, feat in enumerate(features):
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w = feat[width]
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h = feat[height]
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angle = feat[rotation]
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if not w or not h or not angle:
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QgsMessageLog.logMessage(self.tr('Feature {} has empty '
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'width, height or angle. '
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'Skipping...'.format(feat.id())),
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self.tr('Processing'), QgsMessageLog.WARNING)
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continue
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xOffset = w / 2.0
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yOffset = h / 2.0
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phi = angle * math.pi / 180
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point = feat.geometry().asPoint()
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x = point.x()
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y = point.y()
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points = []
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for t in [(2 * math.pi) / segments * i for i in range(segments)]:
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points.append((xOffset * math.cos(t), yOffset * math.sin(t)))
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polygon = [[QgsPoint(i[0] * math.cos(phi) + i[1] * math.sin(phi) + x,
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-i[0] * math.sin(phi) + i[1] * math.cos(phi) + y) for i in points]]
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ft.setGeometry(QgsGeometry.fromPolygon(polygon))
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ft.setAttributes(feat.attributes())
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writer.addFeature(ft)
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else:
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for current, feat in enumerate(features):
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w = feat[width]
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h = feat[height]
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if not w or not h:
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QgsMessageLog.logMessage(self.tr('Feature {} has empty '
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'width or height. '
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'Skipping...'.format(feat.id())),
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self.tr('Processing'), QgsMessageLog.WARNING)
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continue
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xOffset = w / 2.0
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yOffset = h / 2.0
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point = feat.geometry().asPoint()
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x = point.x()
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y = point.y()
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points = []
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for t in [(2 * math.pi) / segments * i for i in range(segments)]:
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points.append((xOffset * math.cos(t), yOffset * math.sin(t)))
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polygon = [[QgsPoint(i[0] + x, i[1] + y) for i in points]]
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ft.setGeometry(QgsGeometry.fromPolygon(polygon))
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ft.setAttributes(feat.attributes())
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writer.addFeature(ft)
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