/
ExtentFromLayer.py
159 lines (126 loc) · 5.54 KB
/
ExtentFromLayer.py
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# -*- coding: utf-8 -*-
"""
***************************************************************************
ExtentFromLayer.py
---------------------
Date : August 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. *
* *
***************************************************************************
"""
__author__ = 'Victor Olaya'
__date__ = 'August 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 math import floor, ceil
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtCore import QVariant
from qgis.core import (QgsApplication,
QgsField,
QgsFeatureSink,
QgsGeometry,
QgsFeature,
QgsWkbTypes,
QgsProcessing,
QgsProcessingException,
QgsProcessingParameterMapLayer,
QgsProcessingParameterNumber,
QgsProcessingParameterFeatureSink,
QgsFields)
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class ExtentFromLayer(QgisAlgorithm):
INPUT = 'INPUT'
BY_FEATURE = 'BY_FEATURE'
ROUND_TO = 'ROUND_TO'
OUTPUT = 'OUTPUT'
def icon(self):
return QgsApplication.getThemeIcon("/algorithms/mAlgorithmExtractLayerExtent.svg")
def svgIconPath(self):
return QgsApplication.iconPath("/algorithms/mAlgorithmExtractLayerExtent.svg")
def tags(self):
return self.tr('polygon,vector,raster,extent,envelope,bounds,bounding,boundary,layer,round,rounded').split(',')
def group(self):
return self.tr('Layer tools')
def groupId(self):
return 'layertools'
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.addParameter(QgsProcessingParameterMapLayer(self.INPUT, self.tr('Input layer')))
self.addParameter(QgsProcessingParameterNumber(self.ROUND_TO,
self.tr('Round values to'),
minValue=0,
defaultValue=0,
type=QgsProcessingParameterNumber.Double))
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Extent'), type=QgsProcessing.TypeVectorPolygon))
def name(self):
return 'polygonfromlayerextent'
def displayName(self):
return self.tr('Extract layer extent')
def processAlgorithm(self, parameters, context, feedback):
layer = self.parameterAsLayer(parameters, self.INPUT, context)
round_to = self.parameterAsDouble(parameters, self.ROUND_TO, context)
fields = QgsFields()
fields.append(QgsField('MINX', QVariant.Double))
fields.append(QgsField('MINY', QVariant.Double))
fields.append(QgsField('MAXX', QVariant.Double))
fields.append(QgsField('MAXY', QVariant.Double))
fields.append(QgsField('CNTX', QVariant.Double))
fields.append(QgsField('CNTY', QVariant.Double))
fields.append(QgsField('AREA', QVariant.Double))
fields.append(QgsField('PERIM', QVariant.Double))
fields.append(QgsField('HEIGHT', QVariant.Double))
fields.append(QgsField('WIDTH', QVariant.Double))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, QgsWkbTypes.Polygon, layer.crs())
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
try:
# may not be possible
layer.updateExtents()
except:
pass
rect = layer.extent()
if round_to > 0:
rect.setXMinimum(floor(rect.xMinimum() / round_to) * round_to)
rect.setYMinimum(floor(rect.yMinimum() / round_to) * round_to)
rect.setXMaximum(ceil(rect.xMaximum() / round_to) * round_to)
rect.setYMaximum(ceil(rect.yMaximum() / round_to) * round_to)
geometry = QgsGeometry.fromRect(rect)
minx = rect.xMinimum()
miny = rect.yMinimum()
maxx = rect.xMaximum()
maxy = rect.yMaximum()
height = rect.height()
width = rect.width()
cntx = minx + width / 2.0
cnty = miny + height / 2.0
area = width * height
perim = 2 * width + 2 * height
feat = QgsFeature()
feat.setGeometry(geometry)
attrs = [
minx,
miny,
maxx,
maxy,
cntx,
cnty,
area,
perim,
height,
width,
]
feat.setAttributes(attrs)
sink.addFeature(feat, QgsFeatureSink.FastInsert)
return {self.OUTPUT: dest_id}