mirror of
https://github.com/qgis/QGIS.git
synced 2025-04-15 00:04:00 -04:00
44e7f3371e
Allows creation of a new vector layer with a single feature containing a raster layer's extent. Previously this was only possible for vector layers.
128 lines
4.3 KiB
Python
Executable File
128 lines
4.3 KiB
Python
Executable File
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
ExtentFromRasterLayer.py
|
|
---------------------
|
|
Date : August 2017
|
|
Copyright : (C) 2017 by Nyall Dawson
|
|
Email : nyall dot dawson 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__ = 'Nyall Dawson'
|
|
__date__ = 'August 2017'
|
|
__copyright__ = '(C) 2017, Nyall Dawson'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
import os
|
|
|
|
from qgis.PyQt.QtGui import QIcon
|
|
from qgis.PyQt.QtCore import QVariant
|
|
|
|
from qgis.core import (QgsField,
|
|
QgsFeatureSink,
|
|
QgsPointXY,
|
|
QgsGeometry,
|
|
QgsFeature,
|
|
QgsWkbTypes,
|
|
QgsProcessing,
|
|
QgsProcessingParameterRasterLayer,
|
|
QgsProcessingParameterFeatureSink,
|
|
QgsFields)
|
|
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class ExtentFromRasterLayer(QgisAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def icon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'layer_extent.png'))
|
|
|
|
def tags(self):
|
|
return self.tr('extent,envelope,bounds,bounding,boundary,layer').split(',')
|
|
|
|
def group(self):
|
|
return self.tr('Raster tools')
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def initAlgorithm(self, config=None):
|
|
self.addParameter(QgsProcessingParameterRasterLayer(self.INPUT, self.tr('Input layer')))
|
|
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Extent'), type=QgsProcessing.TypeVectorPolygon))
|
|
|
|
def name(self):
|
|
return 'polygonfromrasterextent'
|
|
|
|
def displayName(self):
|
|
return self.tr('Polygon from raster extent')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
raster = self.parameterAsRasterLayer(parameters, self.INPUT, 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, raster.crs())
|
|
|
|
self.layerExtent(raster, sink, feedback)
|
|
|
|
return {self.OUTPUT: dest_id}
|
|
|
|
def layerExtent(self, raster, sink, feedback):
|
|
rect = raster.extent()
|
|
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)
|