mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-31 00:06:02 -04:00
ede452be85
Algorithms are now passed a QgsProcessingFeedback object instead of the loosely defined progress parameter.
130 lines
5.0 KiB
Python
130 lines
5.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
VectorGridPolygons.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. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
__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
|
|
import math
|
|
|
|
from qgis.PyQt.QtGui import QIcon
|
|
from qgis.PyQt.QtCore import QVariant
|
|
|
|
from qgis.core import Qgis, QgsRectangle, QgsFields, QgsField, QgsFeature, QgsGeometry, QgsPoint, QgsWkbTypes
|
|
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.outputs import OutputVector
|
|
from processing.tools import dataobjects
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class VectorGridPolygons(GeoAlgorithm):
|
|
|
|
EXTENT = 'EXTENT'
|
|
STEP_X = 'STEP_X'
|
|
STEP_Y = 'STEP_Y'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def __init__(self):
|
|
GeoAlgorithm.__init__(self)
|
|
# this algorithm is deprecated - use GridPolygon instead
|
|
self.showInToolbox = False
|
|
|
|
def getIcon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'vector_grid.png'))
|
|
|
|
def defineCharacteristics(self):
|
|
self.name, self.i18n_name = self.trAlgorithm('Vector grid (polygons)')
|
|
self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
|
|
|
|
self.addParameter(ParameterExtent(self.EXTENT,
|
|
self.tr('Grid extent'), optional=False))
|
|
self.addParameter(ParameterNumber(self.STEP_X,
|
|
self.tr('X spacing'), 0.0, 1000000000.0, 0.0001))
|
|
self.addParameter(ParameterNumber(self.STEP_Y,
|
|
self.tr('Y spacing'), 0.0, 1000000000.0, 0.0001))
|
|
|
|
self.addOutput(OutputVector(self.OUTPUT, self.tr('Grid'), datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
|
|
|
|
def processAlgorithm(self, feedback):
|
|
extent = self.getParameterValue(self.EXTENT).split(',')
|
|
xSpace = self.getParameterValue(self.STEP_X)
|
|
ySpace = self.getParameterValue(self.STEP_Y)
|
|
|
|
bbox = QgsRectangle(float(extent[0]), float(extent[2]),
|
|
float(extent[1]), float(extent[3]))
|
|
|
|
mapCRS = iface.mapCanvas().mapSettings().destinationCrs()
|
|
|
|
fields = QgsFields()
|
|
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
|
|
|
|
fields.append(QgsField('xmin', QVariant.Double, '', 24, 15))
|
|
fields.append(QgsField('xmax', QVariant.Double, '', 24, 15))
|
|
fields.append(QgsField('ymin', QVariant.Double, '', 24, 15))
|
|
fields.append(QgsField('ymax', QVariant.Double, '', 24, 15))
|
|
fieldCount = 5
|
|
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
|
|
fields, QgsWkbTypes.Polygon, mapCRS)
|
|
|
|
feat = QgsFeature()
|
|
feat.initAttributes(fieldCount)
|
|
feat.setFields(fields)
|
|
geom = QgsGeometry()
|
|
idVar = 0
|
|
|
|
# counters for progressbar - update every 5%
|
|
count = 0
|
|
count_max = (bbox.yMaximum() - bbox.yMinimum()) / ySpace
|
|
count_update = count_max * 0.05
|
|
y = bbox.yMaximum()
|
|
while y >= bbox.yMinimum():
|
|
x = bbox.xMinimum()
|
|
while x <= bbox.xMaximum():
|
|
pt1 = QgsPoint(x, y)
|
|
pt2 = QgsPoint(x + xSpace, y)
|
|
pt3 = QgsPoint(x + xSpace, y - ySpace)
|
|
pt4 = QgsPoint(x, y - ySpace)
|
|
pt5 = QgsPoint(x, y)
|
|
polygon = [[pt1, pt2, pt3, pt4, pt5]]
|
|
feat.setGeometry(geom.fromPolygon(polygon))
|
|
feat.setAttribute(0, idVar)
|
|
feat.setAttribute(1, x)
|
|
feat.setAttribute(2, x + xSpace)
|
|
feat.setAttribute(3, y - ySpace)
|
|
feat.setAttribute(4, y)
|
|
writer.addFeature(feat)
|
|
idVar += 1
|
|
x = x + xSpace
|
|
y = y - ySpace
|
|
count += 1
|
|
if int(math.fmod(count, count_update)) == 0:
|
|
feedback.setProgress(int(count / count_max * 100))
|
|
|
|
del writer
|