/
doMeanCoords.py
executable file
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/
doMeanCoords.py
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# -*- coding: utf-8 -*-
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import ftools_utils
from qgis.core import *
from math import *
from ui_frmMeanCoords import Ui_Dialog
class Dialog(QDialog, Ui_Dialog):
def __init__(self, iface, function):
QDialog.__init__(self)
self.iface = iface
self.function = function
self.setupUi(self)
self.updateUi()
QObject.connect(self.toolOut, SIGNAL("clicked()"), self.outFile)
QObject.connect(self.inShape, SIGNAL("currentIndexChanged(QString)"), self.update)
# populate layer list
self.progressBar.setValue(0)
mapCanvas = self.iface.mapCanvas()
layers = ftools_utils.getLayerNames([QGis.Point, QGis.Line, QGis.Polygon])
self.inShape.addItems(layers)
def updateUi(self):
if self.function == 1:
self.setWindowTitle( self.tr("Mean coordinates") )
self.sizeValue.setVisible(False)
self.label_size.setVisible(False)
elif self.function == 2:
self.setWindowTitle( self.tr("Standard distance") )
self.resize(381, 100)
def update(self, inputLayer):
self.weightField.clear()
self.uniqueField.clear()
self.weightField.addItem( self.tr("(Optional) Weight field") )
self.uniqueField.addItem( self.tr("(Optional) Unique ID field") )
self.changedLayer = ftools_utils.getVectorLayerByName(inputLayer)
changedField = ftools_utils.getFieldList(self.changedLayer)
for i in changedField:
if changedField[i].type() == QVariant.Int or changedField[i].type() == QVariant.Double:
self.weightField.addItem(unicode(changedField[i].name()))
self.uniqueField.addItem(unicode(changedField[i].name()))
def accept(self):
if self.inShape.currentText() == "":
QMessageBox.information(self, self.tr("Coordinate statistics"), self.tr("No input vector layer specified"))
elif self.outShape.text() == "":
QMessageBox.information(self, self.tr("Coordinate statistics"), self.tr("Please specify output shapefile"))
else:
inName = self.inShape.currentText()
outPath = self.outShape.text()
if outPath.contains("\\"):
outName = outPath.right((outPath.length() - outPath.lastIndexOf("\\")) - 1)
else:
outName = outPath.right((outPath.length() - outPath.lastIndexOf("/")) - 1)
if outName.endsWith(".shp"):
outName = outName.left(outName.length() - 4)
self.compute(inName, outPath, self.weightField.currentText(), self.sizeValue.value(), self.uniqueField.currentText())
self.progressBar.setValue(100)
self.outShape.clear()
addToTOC = QMessageBox.question(self, self.tr("Coordinate statistics"), self.tr("Created output point shapefile:\n%1\n\nWould you like to add the new layer to the TOC?").arg( outPath ), QMessageBox.Yes, QMessageBox.No, QMessageBox.NoButton)
if addToTOC == QMessageBox.Yes:
self.vlayer = QgsVectorLayer(outPath, unicode(outName), "ogr")
if self.vlayer.geometryType() == QGis.Point:
render = QgsSingleSymbolRenderer(QGis.Point)
symbol = QgsSymbol(QGis.Point)
symbol.setFillColor(Qt.red)
symbol.setFillStyle(Qt.SolidPattern)
symbol.setColor(Qt.red)
symbol.setPointSize(5)
render.addSymbol(symbol)
self.vlayer.setRenderer(render)
QgsMapLayerRegistry.instance().addMapLayer(self.vlayer)
self.progressBar.setValue(0)
def outFile(self):
self.outShape.clear()
( self.shapefileName, self.encoding ) = ftools_utils.saveDialog( self )
if self.shapefileName is None or self.encoding is None:
return
self.outShape.setText( QString( self.shapefileName ) )
def compute(self, inName, outName, weightField="", times=1, uniqueField=""):
vlayer = ftools_utils.getVectorLayerByName(inName)
provider = vlayer.dataProvider()
weightIndex = provider.fieldNameIndex(weightField)
uniqueIndex = provider.fieldNameIndex(uniqueField)
feat = QgsFeature()
allAttrs = provider.attributeIndexes()
provider.select(allAttrs)
sRs = provider.crs()
check = QFile(self.shapefileName)
if check.exists():
if not QgsVectorFileWriter.deleteShapeFile(self.shapefileName):
return
if uniqueIndex <> -1:
uniqueValues = ftools_utils.getUniqueValues(provider, int( uniqueIndex ) )
single = False
else:
uniqueValues = [QVariant(1)]
single = True
if self.function == 2:
fieldList = { 0 : QgsField("STD_DIST", QVariant.Double), 1 : QgsField("UID", QVariant.String) }
writer = QgsVectorFileWriter(self.shapefileName, self.encoding, fieldList, QGis.WKBPolygon, sRs)
else:
fieldList = { 0 : QgsField("MEAN_X", QVariant.Double), 1 : QgsField("MEAN_Y", QVariant.Double), 2 : QgsField("UID", QVariant.String) }
writer = QgsVectorFileWriter(self.shapefileName, self.encoding, fieldList, QGis.WKBPoint, sRs)
outfeat = QgsFeature()
points = []
weights = []
nFeat = provider.featureCount() * len(uniqueValues)
nElement = 0
self.progressBar.setValue(0)
self.progressBar.setRange(0, nFeat)
for j in uniqueValues:
provider.rewind()
provider.select(allAttrs)
cx = 0.00
cy = 0.00
points = []
weights = []
while provider.nextFeature(feat):
nElement += 1
self.progressBar.setValue(nElement)
if single:
check = j.toString().trimmed()
else:
check = feat.attributeMap()[uniqueIndex].toString().trimmed()
if check == j.toString().trimmed():
cx = 0.00
cy = 0.00
if weightIndex == -1:
weight = 1.00
else:
weight = float(feat.attributeMap()[weightIndex].toDouble()[0])
geom = QgsGeometry(feat.geometry())
geom = self.extract(geom)
for i in geom:
cx += i.x()
cy += i.y()
points.append(QgsPoint((cx / len(geom)), (cy / len(geom))))
weights.append(weight)
sumWeight = sum(weights)
cx = 0.00
cy = 0.00
item = 0
for item, i in enumerate(points):
cx += i.x() * weights[item]
cy += i.y() * weights[item]
cx = cx / sumWeight
cy = cy / sumWeight
meanPoint = QgsPoint(cx, cy)
if self.function == 2:
values = []
md = 0.00
sd = 0.00
dist = QgsDistanceArea()
item = 0
for i in points:
tempDist = dist.measureLine(i, meanPoint)
values.append(tempDist)
item += 1
md += tempDist
md = md / item
for i in values:
sd += (i-md)*(i-md)
sd = sqrt(sd/item)
outfeat.setGeometry(QgsGeometry.fromPoint(meanPoint).buffer(sd * times, 10))
outfeat.addAttribute(0, QVariant(sd))
outfeat.addAttribute(1, QVariant(j))
else:
outfeat.setGeometry(QgsGeometry.fromPoint(meanPoint))
outfeat.addAttribute(0, QVariant(cx))
outfeat.addAttribute(1, QVariant(cy))
outfeat.addAttribute(2, QVariant(j))
writer.addFeature(outfeat)
if single:
break
del writer
def extract(self, geom):
multi_geom = QgsGeometry()
temp_geom = []
if geom.type() == 0: # it's a point
if geom.isMultipart():
temp_geom = geom.asMultiPoint()
else:
temp_geom.append(geom.asPoint())
if geom.type() == 1: # it's a line
if geom.isMultipart():
multi_geom = geom.asMultiPolyline() #multi_geog is a multiline
for i in multi_geom: #i is a line
temp_geom.extend(i)
else:
temp_geom = geom.asPolyline()
elif geom.type() == 2: # it's a polygon
if geom.isMultipart():
multi_geom = geom.asMultiPolygon() #multi_geom is a multipolygon
for i in multi_geom: #i is a polygon
for j in i: #j is a line
temp_geom.extend(j)
else:
multi_geom = geom.asPolygon() #multi_geom is a polygon
for i in multi_geom: #i is a line
temp_geom.extend(i)
return temp_geom