QGIS/python/plugins/processing/algs/qgis/DensifyGeometries.py

# -*- coding: utf-8 -*-

"""
***************************************************************************
    DensifyGeometries.py
    ---------------------
    Date                 : October 2012
    Copyright            : (C) 2012 by Victor Olaya
    Email                : volayaf at gmail dot com
***************************************************************************
*                                                                         *
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU General Public License as published by  *
*   the Free Software Foundation; either version 2 of the License, or     *
*   (at your option) any later version.                                   *
*                                                                         *
***************************************************************************
"""
from builtins import range

__author__ = 'Victor Olaya'
__date__ = 'October 2012'
__copyright__ = '(C) 2012, Victor Olaya'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'

import os

from qgis.core import QgsGeometry, QgsPoint, QgsWkbTypes

from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterNumber
from processing.core.outputs import OutputVector
from processing.tools import dataobjects, vector

pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]


class DensifyGeometries(GeoAlgorithm):

    INPUT = 'INPUT'
    VERTICES = 'VERTICES'
    OUTPUT = 'OUTPUT'

    def defineCharacteristics(self):
        self.name, self.i18n_name = self.trAlgorithm('Densify geometries')
        self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
        self.tags = self.tr('add,vertices,points')

        self.addParameter(ParameterVector(self.INPUT,
                                          self.tr('Input layer'),
                                          [dataobjects.TYPE_VECTOR_POLYGON, dataobjects.TYPE_VECTOR_LINE]))
        self.addParameter(ParameterNumber(self.VERTICES,
                                          self.tr('Vertices to add'), 1, 10000000, 1))

        self.addOutput(OutputVector(self.OUTPUT,
                                    self.tr('Densified')))

    def processAlgorithm(self, feedback):
        layer = dataobjects.getObjectFromUri(
            self.getParameterValue(self.INPUT))
        vertices = self.getParameterValue(self.VERTICES)

        isPolygon = layer.geometryType() == QgsWkbTypes.PolygonGeometry

        writer = self.getOutputFromName(
            self.OUTPUT).getVectorWriter(layer.fields().toList(),
                                         layer.wkbType(), layer.crs())

        features = vector.features(layer)
        total = 100.0 / len(features)
        for current, f in enumerate(features):
            feature = f
            if feature.hasGeometry():
                new_geometry = feature.geometry().densifyByCount(int(vertices))
                feature.setGeometry(new_geometry)
            writer.addFeature(feature)
            feedback.setProgress(int(current * total))

        del writer