mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-28 00:17:30 -05:00
147 lines
5.6 KiB
Python
147 lines
5.6 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
RegularPoints.py
|
|
---------------------
|
|
Date : September 2014
|
|
Copyright : (C) 2014 by Alexander Bruy
|
|
Email : alexander dot bruy 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 str
|
|
|
|
__author__ = 'Alexander Bruy'
|
|
__date__ = 'September 2014'
|
|
__copyright__ = '(C) 2014, Alexander Bruy'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
import os
|
|
from random import seed, uniform
|
|
from math import sqrt
|
|
|
|
from qgis.PyQt.QtGui import QIcon
|
|
from qgis.PyQt.QtCore import QVariant
|
|
from qgis.core import (QgsRectangle, QgsFields, QgsField, QgsFeature, QgsWkbTypes,
|
|
QgsGeometry, QgsPoint, QgsCoordinateReferenceSystem)
|
|
from qgis.utils import iface
|
|
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.parameters import ParameterExtent
|
|
from processing.core.parameters import ParameterNumber
|
|
from processing.core.parameters import ParameterBoolean
|
|
from processing.core.parameters import ParameterCrs
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class RegularPoints(GeoAlgorithm):
|
|
|
|
EXTENT = 'EXTENT'
|
|
SPACING = 'SPACING'
|
|
INSET = 'INSET'
|
|
RANDOMIZE = 'RANDOMIZE'
|
|
IS_SPACING = 'IS_SPACING'
|
|
OUTPUT = 'OUTPUT'
|
|
CRS = 'CRS'
|
|
|
|
def icon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'regular_points.png'))
|
|
|
|
def group(self):
|
|
return self.tr('Vector creation tools')
|
|
|
|
def name(self):
|
|
return 'regularpoints'
|
|
|
|
def displayName(self):
|
|
return self.tr('Regular points')
|
|
|
|
def defineCharacteristics(self):
|
|
self.addParameter(ParameterExtent(self.EXTENT,
|
|
self.tr('Input extent'), optional=False))
|
|
self.addParameter(ParameterNumber(self.SPACING,
|
|
self.tr('Point spacing/count'), 100, 999999999.999999999, 100))
|
|
self.addParameter(ParameterNumber(self.INSET,
|
|
self.tr('Initial inset from corner (LH side)'), 0.0, 9999.9999, 0.0))
|
|
self.addParameter(ParameterBoolean(self.RANDOMIZE,
|
|
self.tr('Apply random offset to point spacing'), False))
|
|
self.addParameter(ParameterBoolean(self.IS_SPACING,
|
|
self.tr('Use point spacing'), True))
|
|
self.addParameter(ParameterCrs(self.CRS,
|
|
self.tr('Output layer CRS'), 'ProjectCrs'))
|
|
self.addOutput(OutputVector(self.OUTPUT, self.tr('Regular points'), datatype=[dataobjects.TYPE_VECTOR_POINT]))
|
|
|
|
def processAlgorithm(self, context, feedback):
|
|
extent = str(self.getParameterValue(self.EXTENT)).split(',')
|
|
|
|
spacing = float(self.getParameterValue(self.SPACING))
|
|
inset = float(self.getParameterValue(self.INSET))
|
|
randomize = self.getParameterValue(self.RANDOMIZE)
|
|
isSpacing = self.getParameterValue(self.IS_SPACING)
|
|
crsId = self.getParameterValue(self.CRS)
|
|
crs = QgsCoordinateReferenceSystem()
|
|
crs.createFromUserInput(crsId)
|
|
|
|
extent = QgsRectangle(float(extent[0]), float(extent[2]),
|
|
float(extent[1]), float(extent[3]))
|
|
|
|
fields = QgsFields()
|
|
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
|
|
|
|
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
|
|
fields, QgsWkbTypes.Point, crs)
|
|
|
|
if randomize:
|
|
seed()
|
|
|
|
area = extent.width() * extent.height()
|
|
if isSpacing:
|
|
pSpacing = spacing
|
|
else:
|
|
pSpacing = sqrt(area / spacing)
|
|
|
|
f = QgsFeature()
|
|
f.initAttributes(1)
|
|
f.setFields(fields)
|
|
|
|
count = 0
|
|
total = 100.0 / (area / pSpacing)
|
|
y = extent.yMaximum() - inset
|
|
|
|
extent_geom = QgsGeometry.fromRect(extent)
|
|
extent_engine = QgsGeometry.createGeometryEngine(extent_geom.geometry())
|
|
extent_engine.prepareGeometry()
|
|
|
|
while y >= extent.yMinimum():
|
|
x = extent.xMinimum() + inset
|
|
while x <= extent.xMaximum():
|
|
if randomize:
|
|
geom = QgsGeometry().fromPoint(QgsPoint(
|
|
uniform(x - (pSpacing / 2.0), x + (pSpacing / 2.0)),
|
|
uniform(y - (pSpacing / 2.0), y + (pSpacing / 2.0))))
|
|
else:
|
|
geom = QgsGeometry().fromPoint(QgsPoint(x, y))
|
|
|
|
if extent_engine.intersects(geom.geometry()):
|
|
f.setAttribute('id', count)
|
|
f.setGeometry(geom)
|
|
writer.addFeature(f)
|
|
x += pSpacing
|
|
count += 1
|
|
feedback.setProgress(int(count * total))
|
|
y = y - pSpacing
|
|
del writer
|