mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-28 00:17:30 -05:00
128 lines
4.5 KiB
Python
128 lines
4.5 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
MeanCoords.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__ = '$Format:%H$'
|
|
|
|
from PyQt4.QtCore import *
|
|
from qgis.core import *
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.parameters import ParameterTableField
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects, vector
|
|
|
|
|
|
class MeanCoords(GeoAlgorithm):
|
|
|
|
POINTS = 'POINTS'
|
|
WEIGHT = 'WEIGHT'
|
|
OUTPUT = 'OUTPUT'
|
|
UID = 'UID'
|
|
WEIGHT = 'WEIGHT'
|
|
|
|
def defineCharacteristics(self):
|
|
self.name = 'Mean coordinate(s)'
|
|
self.group = 'Vector analysis tools'
|
|
|
|
self.addParameter(ParameterVector(self.POINTS, 'Input layer',
|
|
[ParameterVector.VECTOR_TYPE_ANY]))
|
|
self.addParameter(ParameterTableField(self.WEIGHT, 'Weight field',
|
|
MeanCoords.POINTS,
|
|
ParameterTableField.DATA_TYPE_NUMBER,
|
|
optional = True))
|
|
self.addParameter(ParameterTableField(self.UID, 'Unique ID field',
|
|
MeanCoords.POINTS,
|
|
ParameterTableField.DATA_TYPE_NUMBER,
|
|
optional = True))
|
|
|
|
self.addOutput(OutputVector(MeanCoords.OUTPUT, 'Result'))
|
|
|
|
def processAlgorithm(self, progress):
|
|
layer = dataobjects.getObjectFromUri(
|
|
self.getParameterValue(self.POINTS))
|
|
weightField = self.getParameterValue(self.WEIGHT)
|
|
uniqueField = self.getParameterValue(self.UID)
|
|
|
|
if weightField is None:
|
|
weightIndex = -1
|
|
else:
|
|
weightIndex = layer.fieldNameIndex(weightField)
|
|
|
|
if uniqueField is None:
|
|
uniqueIndex = -1
|
|
else:
|
|
uniqueIndex = layer.fieldNameIndex(uniqueField)
|
|
|
|
fieldList = [QgsField('MEAN_X', QVariant.Double, '', 24, 15),
|
|
QgsField('MEAN_Y', QVariant.Double, '', 24, 15),
|
|
QgsField('UID', QVariant.String, '', 255)]
|
|
|
|
writer = self.getOutputFromName(
|
|
self.OUTPUT).getVectorWriter(fieldList,
|
|
QGis.WKBPoint, layer.crs())
|
|
|
|
current = 0
|
|
features = vector.features(layer)
|
|
total = 100.0 / float(len(features))
|
|
|
|
means = {}
|
|
for feat in features:
|
|
current += 1
|
|
progress.setPercentage(current * total)
|
|
if uniqueIndex == -1:
|
|
clazz = "Single class"
|
|
else:
|
|
clazz = str(feat.attributes()[uniqueIndex]).strip()
|
|
if weightIndex == -1:
|
|
weight = 1.00
|
|
else:
|
|
try:
|
|
weight = float(feat.attributes()[weightIndex])
|
|
except:
|
|
weight = 1.00
|
|
if clazz not in means:
|
|
means[clazz] = (0, 0, 0)
|
|
|
|
(cx, cy, totalweight) = means[clazz]
|
|
geom = QgsGeometry(feat.geometry())
|
|
geom = vector.extractPoints(geom)
|
|
for i in geom:
|
|
cx += i.x() * weight
|
|
cy += i.y() * weight
|
|
totalweight += weight
|
|
means[clazz] = (cx, cy, totalweight)
|
|
|
|
for (clazz, values) in means.iteritems():
|
|
outFeat = QgsFeature()
|
|
cx = values[0] / values[2]
|
|
cy = values[1] / values[2]
|
|
meanPoint = QgsPoint(cx, cy)
|
|
|
|
outFeat.setGeometry(QgsGeometry.fromPoint(meanPoint))
|
|
outFeat.setAttributes([cx, cy, clazz])
|
|
writer.addFeature(outFeat)
|
|
|
|
del writer
|