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1e13d733c2
initAlgorithm() method This allows 2 benefits: - algorithms can be subclassed and have subclasses add additional parameters/outputs to the algorithm. With the previous approach of declaring parameters/outputs in the constructor, it's not possible to call virtual methods to add additional parameters/ outputs (since you can't call virtual methods from a constructor). - initAlgorithm takes a variant map argument, allowing the algorithm to dynamically adjust its declared parameters and outputs according to this configuration map. This potentially allows model algorithms which can be configured to have variable numbers of parameters and outputs at run time. E.g. a "router" algorithm which directs features to one of any number of output sinks depending on some user configured criteria.
286 lines
12 KiB
Python
286 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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QgsFeatureSink,
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QgsGeometry,
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QgsPointXY,
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QgsMessageLog,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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
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class RectanglesOvalsDiamondsVariable(QgisAlgorithm):
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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 group(self):
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return self.tr('Vector geometry tools')
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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.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 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 processAlgorithm(self, parameters, context, feedback):
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layer = 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(), 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 = [[QgsPointXY(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, QgsFeatureSink.FastInsert)
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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 = [[QgsPointXY(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, QgsFeatureSink.FastInsert)
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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 = [[QgsPointXY(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, QgsFeatureSink.FastInsert)
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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 = [[QgsPointXY(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, QgsFeatureSink.FastInsert)
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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 = [[QgsPointXY(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, QgsFeatureSink.FastInsert)
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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 = [[QgsPointXY(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, QgsFeatureSink.FastInsert)
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