mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-04 00:30:59 -05:00
f84d703234
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.
100 lines
3.6 KiB
Python
100 lines
3.6 KiB
Python
# -*- 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,
|
|
QgsApplication,
|
|
QgsProcessingUtils)
|
|
|
|
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 icon(self):
|
|
return QgsApplication.getThemeIcon("/providerQgis.svg")
|
|
|
|
def svgIconPath(self):
|
|
return QgsApplication.iconPath("providerQgis.svg")
|
|
|
|
def tags(self):
|
|
return self.tr('add,vertices,points').split(',')
|
|
|
|
def group(self):
|
|
return self.tr('Vector geometry tools')
|
|
|
|
def name(self):
|
|
return 'densifygeometries'
|
|
|
|
def displayName(self):
|
|
return self.tr('Densify geometries')
|
|
|
|
def defineCharacteristics(self):
|
|
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, context, feedback):
|
|
layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
|
|
vertices = self.getParameterValue(self.VERTICES)
|
|
|
|
isPolygon = layer.geometryType() == QgsWkbTypes.PolygonGeometry
|
|
|
|
writer = self.getOutputFromName(
|
|
self.OUTPUT).getVectorWriter(layer.fields().toList(), layer.wkbType(), layer.crs(), context)
|
|
|
|
features = QgsProcessingUtils.getFeatures(layer, context)
|
|
total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
|
|
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
|