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reffunctions.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
ReferenceFunctions
A QGIS plugin
Provide field calculator function for Reference to other layers/features
based on Nathan Woodrow work:
http://nathanw.net/2012/11/10/user-defined-expression-functions-for-qgis/
-------------------
begin : 2014-09-20
copyright : (C) 2014 by enrico ferreguti
email : [email protected]
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
"""
# Import the PyQt and QGIS libraries
from qgis.PyQt.QtCore import *
from qgis.PyQt.QtGui import *
from qgis.PyQt.QtSql import *
try:
from qgis.PyQt.QtWidgets import *
except:
pass
#from qgis.core import *
import qgis
from qgis.utils import iface,qgsfunction
from qgis.core import QgsGeometry,QgsExpression,QgsMapLayer,QgsFeatureRequest
# Import the code for the dialog
from .reffunctionsdialog import refFunctionsDialog
import os.path
import sys
def _getLayerSet():
try: #qgis 2
return {layer.name():layer for layer in iface.legendInterface().layers()}
except: #qgis 3
return {layer.name():layer for layer in qgis.core.QgsProject.instance().mapLayers().values()}
@qgsfunction(4, "Reference", register=False)
def dbvalue(values, feature, parent):
"""
Retrieve first targetField value from targetLayer when keyField is equal to conditionValue
<h4>Syntax</h4>
<p>dbvalue(<i>targetLayer,targetField,keyField,conditionValue</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetLayer</i> → a field of targetLayer whom value is needed, for example 'myTargetField'. In case of multiple results only the first is retrieved. If targetLayer = '$geometry' geometry value is retrieved <br></p>
<i> keyField</i> → a field of targetLayer used to search between features, for example 'myKeyField'. <br></p>
<i> conditionValue</i> → value used for comparisons with keyField content. Note thet the value need to be of the same type of keyField<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
dbvalue('myLayer','myTargetField','myKeyField',value) <br>
</p>
<h4>Notes</h4>
<p>
The example function is similar to dbquery('myLayer','myTargetField','myKeyField =value') , but is significantly faster for large database
</p>
"""
dbg = debug()
dbg.out("evaluating dbvalue")
targetLayerName = values[0]
targetFieldName = values[1]
keyFieldName = values[2]
contentCondition = values[3]
#layerSet = {layer.name():layer for layer in iface.legendInterface().layers()}
layerSet = _getLayerSet()
if not (targetLayerName in layerSet.keys()):
parent.setEvalErrorString("Error: invalid targetLayerName")
return
#if not targetLayerName in iface.legendInterface().layers():
# parent.setEvalErrorString("error: targetLayer not present")
#iface = QgsInterface.instance()
res = None
for feat in layerSet[targetLayerName].getFeatures():
if feat.attribute(keyFieldName) == contentCondition:
if targetFieldName == "$geometry":
res = feat.geometry().asWkt()
else:
try:
res = feat.attribute(targetFieldName)
except:
parent.setEvalErrorString("Error: invalid targetFieldName")
return
return res
@qgsfunction(3, "Reference", register=False, usesgeometry=True)
def dbvaluebyid(values, feature, parent):
"""
Retrieve the targetField value from targetLayer using internal feature ID
<h4>Syntax</h4>
<p>dbvaluebyid(<i>'targetLayer','targetField',featureID</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetField</i> → a field of targetLayer whom value is needed, for example 'myTargetField'. In case of multiple results only the first is retrieved. If targetField = '$geometry' geometry value is retrieved <br></p>
<i> featureID</i> → A Integer number reference to internal feature ID. <br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
dbvaluebyid('myLayer','myTargetField',112) <br>
</p>
"""
dbg = debug()
dbg.out("evaluating dbvalue")
targetLayerName = values[0]
targetFieldName = values[1]
targetFeatureId = values[2]
#layerSet = {layer.name():layer for layer in iface.legendInterface().layers()}
layerSet = _getLayerSet()
if not (targetLayerName in layerSet.keys()):
parent.setEvalErrorString("Error: invalid targetLayerName")
return
#if not targetLayerName in iface.legendInterface().layers():
# parent.setEvalErrorString("error: targetLayer not present")
#iface = QgsInterface.instance()
for name,layer in layerSet.items():
if name == targetLayerName:
try:
targetFeatureIter = layer.getFeatures(QgsFeatureRequest(targetFeatureId))
for targetFeature in targetFeatureIter:
pass
except:
parent.setEvalErrorString("Error: invalid targetFeatureIndex")
return
if targetFieldName == "$geometry":
res = targetFeature.geometry().asWkt()
else:
try:
res = targetFeature.attribute(targetFieldName)
except:
parent.setEvalErrorString("Error: invalid targetFieldName")
return
return res
@qgsfunction(3, "Reference", register=False)
def dbquery(values, feature, parent):
"""
Retrieve first targetField value from targetLayer when whereClause is true
<h4>Syntax</h4>
<p>dqquery(<i>targetLayer,targetField,whereClause</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetLayer</i> → a field of targetLayer whom value is needed, for example 'myField'. In case of multiple results only the first is retrieved. If targetLayer = '$geometry' geometry value is retrieved <br></p>
<i> whereClause</i> → a valid expression string without duoble quotes to identify fields, for example 'field1 > 1 and field2 = "foo"' <br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
dbquery('myLayer','myField','field1 > 1 and field2 = "foo"') <br>
dbquery('myLayer','$geometry','field1 > 1 and field2 = "foo"') <br></p>
</p>
"""
targetLayerName = values[0].replace('"','')
targetFieldName = values[1].replace('"','')
whereClause = values[2].replace('"','')
layerSet = _getLayerSet()
if not (targetLayerName in layerSet.keys()):
parent.setEvalErrorString("Error: invalid targetLayerName")
return
dbg=debug()
dbg.out("evaluating dbquery")
for layerName, iterLayer in layerSet.items():
if layerName == targetLayerName:
exp = QgsExpression(whereClause)
exp.prepare(iterLayer.dataProvider().fields())
for feat in iterLayer.getFeatures():
if exp.evaluate(feature):
if targetFieldName == "$geometry":
return feat.geometry().asWkt()
else:
try:
return feat.attribute(targetFieldName)
except:
parent.setEvalErrorString("Error: invalid targetField")
@qgsfunction(2, "Reference", register=False)
def dbsql(values, feature, parent):
"""
Retrieve results from SQL query
<h4>Syntax</h4>
<p>dbsql(<i>connectionName,sqlQuery</i>)</p>
<h4>Arguments</h4>
<p><i> connectionName</i> → the name of a currently registered database connection, for example 'myConnection'.<br>
<i> sqlQuery</i> → a valid sql query string where do, for example 'field1 > 1 and field2 = "foo"' <br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
dbquery('myLayer','myField','field1 > 1 and field2 = "foo"') <br>
dbquery('myLayer','$geometry','field1 > 1 and field2 = "foo"') <br></p>
</p>
"""
dbg=debug()
dbg.out("evaluating dbsql")
connectionName = values[0]
sqlQuery = values[1].replace('""','@#@')
sqlQuery = sqlQuery.replace('"',"'")
sqlQuery = sqlQuery.replace('@#@','"')
conn = SQLconnection(connectionName)
if conn.lastError()=="":
res = conn.submitQuery(sqlQuery)
dbg.out(conn.lastError())
if conn.lastError()=="":
if res!=[]:
if len(res)>1 or len(res[0])>1:
parent.setEvalErrorString("Error: multiple results")
else:
return res[0][0]
else:
parent.setEvalErrorString("Error: null query result")
else:
parent.setEvalErrorString("Error: invalid query\n"+conn.lastError())
else:
parent.setEvalErrorString("Error: invalid connection")
@qgsfunction(1, "Reference", register=False, usesgeometry=True)
def geomRedef(values, feature, parent):
"""
redefine the current feature geometry with a new WKT geometry
<h4>Syntax</h4>
<p>geomRedef(<i>WKTgeometry</i>)</p>
<h4>Arguments</h4>
<p><i> WKTgeometry</i> → a valid WKT geometry provided by expression commands .<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomRedef('myGeometry') <br>
</p>
"""
dbg=debug()
dbg.out("self redefine geometry")
targetGeometry = values[0]
if iface.mapCanvas().currentLayer().isEditable():
try:
iface.mapCanvas().currentLayer().changeGeometry(feature.id(), targetGeometry)
#iface.mapCanvas().currentLayer().updateExtents()
#iface.mapCanvas().currentLayer().setCacheImage(None)
iface.mapCanvas().currentLayer().triggerRepaint()
#feature.setGeometry(targetGeometry)
return 1
except:
parent.setEvalErrorString("Error: geometry is not valid")
return 0
@qgsfunction(1, "Reference", register=False)
def xx(values, feature, parent):
"""
Return the coordinate x of the given point geometry
<h4>Syntax</h4>
<p>dbsql(<i>geometry</i>)</p>
<h4>Arguments</h4>
<p><i> geometry</i> → a valid geometry provided by expression commands 'myGeometry'.<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomRedef('myLayer','myField','field1 > 1 and field2 = "foo"') <br>
dbquery('myLayer','$geometry','field1 > 1 and field2 = "foo"') <br></p>
</p>
"""
dbg=debug()
dbg.out("xx")
pass
@qgsfunction(1, "Transformation", register=False)
def canvaswidth(values, feature, parent):
"""
Return the width of the current canvas width (in pixel or map units)
<h4>Syntax</h4>
<p>CanvasWidth(<i>'units'</i>)</p>
<h4>Arguments</h4>
<p><i> geometry</i> → a valid geometry provided by expression commands 'myGeometry'.<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomRedef('myLayer','myField','field1 > 1 and field2 = "foo"') <br>
dbquery('myLayer','$geometry','field1 > 1 and field2 = "foo"') <br></p>
</p>
"""
dbg=debug()
dbg.out("CanvasWidth")
mapCanvas = iface.mapCanvas()
if values[0]=='pixels':
res = iface.mapCanvas().mapRenderer().width()
elif values[0]=='mapunits':
res = iface.mapCanvas().mapRenderer().width()*iface.mapCanvas().mapRenderer().mapUnitsPerPixel ()
elif values[0]=='mm':
pass
try:
return res
except:
parent.setEvalErrorString("error: argument not valid")
@qgsfunction(1, "Transformation", register=False)
def canvasheight(values, feature, parent):
"""
Return the width of the current canvas width (in pixel or map units)
<h4>Syntax</h4>
<p>CanvasWidth(<i>'units'</i>)</p>
<h4>Arguments</h4>
<p><i> geometry</i> → a valid geometry provided by expression commands 'myGeometry'.<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomRedef('myLayer','myField','field1 > 1 and field2 = "foo"') <br>
dbquery('myLayer','$geometry','field1 > 1 and field2 = "foo"') <br></p>
</p>
"""
dbg=debug()
dbg.out("CanvasWidth")
mapCanvas = iface.mapCanvas()
if values[0]=='pixels':
res = iface.mapCanvas().mapRenderer().height()
elif values[0]=='mapunits':
res = iface.mapCanvas().mapRenderer().height()*iface.mapCanvas().mapRenderer().mapUnitsPerPixel ()
elif values[0]=='mm':
pass
try:
return res
except:
parent.setEvalErrorString("error: argument not valid")
@qgsfunction(0, "Transformation", register=False, usesgeometry=True)
def canvasx(values, feature, parent):
"""
Return the width of the current canvas width (in pixel or map units)
<h4>Syntax</h4>
<p>CanvasWidth(<i>'units'</i>)</p>
<h4>Arguments</h4>
<p><i> geometry</i> → a valid geometry provided by expression commands 'myGeometry'.<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomRedef('myLayer','myField','field1 > 1 and field2 = "foo"') <br>
dbquery('myLayer','$geometry','field1 > 1 and field2 = "foo"') <br></p>
</p>
"""
dbg=debug()
dbg.out("canvasx")
if iface.mapCanvas().mapRenderer().extent().intersects(feature.geometry().boundingBox()):
leftX = iface.mapCanvas().mapRenderer().extent().xMinimum()
featX = feature.geometry().pointOnSurface ().boundingBox().xMinimum()
dbg.out(leftX)
dbg.out(featX)
canvasX = round ((featX-leftX)/iface.mapCanvas().mapRenderer().mapUnitsPerPixel())
return canvasX
else:
return
@qgsfunction(0, "Transformation", register=False, usesgeometry=True)
def canvasy(values, feature, parent):
"""
Return the width of the current canvas width (in pixel or map units)
<h4>Syntax</h4>
<p>CanvasWidth(<i>'units'</i>)</p>
<h4>Arguments</h4>
<p><i> geometry</i> → a valid geometry provided by expression commands 'myGeometry'.<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomRedef('myLayer','myField','field1 > 1 and field2 = "foo"') <br>
dbquery('myLayer','$geometry','field1 > 1 and field2 = "foo"') <br></p>
</p>
"""
dbg=debug()
dbg.out("canvasy")
if iface.mapCanvas().mapRenderer().extent().intersects(feature.geometry().boundingBox()):
bottomY = iface.mapCanvas().mapRenderer().extent().yMinimum()
featY = feature.geometry().pointOnSurface ().boundingBox().yMinimum()
dbg.out(bottomY)
dbg.out(featY)
canvasY = round ((featY-bottomY)/iface.mapCanvas().mapRenderer().mapUnitsPerPixel())
return canvasY
else:
return
@qgsfunction(1, "Reference", register=False)
def WKTcentroid(values, feature, parent):
"""
Return the center of mass of the given geometry
<h4>Syntax</h4>
<p>WKTcentroid(<i>'WKTgeometry'</i>)</p>
<h4>Arguments</h4>
<p><i>WKTgeometry</i> → a valid WKTgeometry<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
WKTcentroid('POLYGON((602793.98 6414014.88,....))') <br>
</p>
"""
dbg=debug()
dbg.out("centroid")
ArgGeometry = QgsGeometry().fromWkt(values[0])
try:
return ArgGeometry.centroid().asWkt()
except:
parent.setEvalErrorString("error: WKT geometry not valid")
return
@qgsfunction(1, "Reference", register=False)
def WKTpointonsurface(values, feature, parent):
"""
Return the point within the given geometry
<h4>Syntax</h4>
<p>WKTpointonsurface(<i>'WKTgeometry'</i>)</p>
<h4>Arguments</h4>
<p><i>WKTgeometry</i> → a valid WKTgeometry<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
WKTpointonsurface('POLYGON((602793.98 6414014.88,....))') <br>
</p>
"""
dbg=debug()
dbg.out("centroid")
ArgGeometry = QgsGeometry().fromWkt(values[0])
try:
return ArgGeometry.pointOnSurface().asWkt()
except:
parent.setEvalErrorString("error: WKT geometry not valid")
return
@qgsfunction(1, "Reference", register=False)
def WKTlenght(values, feature, parent):
"""
Return the length of the given geometry
<h4>Syntax</h4>
<p>WKTlenght<i>'WKTgeometry'</i>)</p>
<h4>Arguments</h4>
<p><i>WKTgeometry</i> → a valid WKTgeometry<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
WKTlenght('POLYGON((602793.98 6414014.88,....))') <br>
</p>
"""
dbg=debug()
dbg.out("lenght")
ArgGeometry = QgsGeometry().fromWkt(values[0])
try:
return ArgGeometry.length()
except:
parent.setEvalErrorString("error: WKT geometry not valid")
return
@qgsfunction(1, "Reference", register=False)
def WKTarea(values, feature, parent):
"""
Return the area of the given geometry
<h4>Syntax</h4>
<p>WKTarea<i>'WKTgeometry'</i>)</p>
<h4>Arguments</h4>
<p><i>WKTgeometry</i> → a valid "Well Known Text" geometry<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
WKTarea('POLYGON((602793.98 6414014.88,....))') <br>
</p>
"""
dbg=debug()
dbg.out("area")
ArgGeometry = QgsGeometry().fromWkt(values[0])
try:
print(ArgGeometry.asWkt() )
return ArgGeometry.area()
except:
#parent.setEvalErrorString("error: WKT geometry not valid")
return None
@qgsfunction(0,"Reference", register=False, usesgeometry=True)
def nearestVertex(values, feature, parent):
"""
Return the nearest vertex as point geometry
<h4>Syntax</h4>
<p>dbsql(<i>geometry</i>)</p>
<h4>Arguments</h4>
<p><i> geometry</i> → a valid geometry provided by expression commands 'myGeometry'.<br></p>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomRedef('myLayer','myField','field1 > 1 and field2 = "foo"') <br>
dbquery('myLayer','$geometry','field1 > 1 and field2 = "foo"') <br></p>
</p>
"""
dbg=debug()
dbg.out("nearestVertex")
pass
@qgsfunction(2, "Reference", register=False, usesgeometry=True)
def geomnearest(values, feature, parent):
"""
Retrieve target field value from the nearest target feature in target layer
<h4>Syntax</h4>
<p>geomnearest(<i>targetLayer,targetField</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetField</i> → a field in target layer we want as result when source feature is within target feature, for example 'myField'. <br/>
If targetField is equal to '$geometry' The WKT geometry of targetFeature willbe retrieved. If otherwise is equal to '$distance' the calculated distance between source and target features will be returned<br></p>
<i> Number of feature tested is limited to 100000 to avoid time wasting loops</i>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomnearest('targetLayer','TargetField') <br>
geomnearest('targetLayer','$geometry') <br>
geomnearest('targetLayer','$distance') <br>
</p>
"""
dbg=debug()
dbg.out("evaluating geomnearest")
targetLayerName = values[0]
targetFieldName = values[1]
dmin = sys.float_info.max
actualGeom = feature.geometry()
layerSet = _getLayerSet()
if not targetLayerName in layerSet.keys():
parent.setEvalErrorString("error: targetLayer not present")
return
count = 0
for name, layer in layerSet.items():
if layer != iface.mapCanvas().currentLayer() and layer.type() == QgsMapLayer.VectorLayer and (targetLayerName == '' or layer.name() == targetLayerName ):
dbg.out(layer.name())
iter = layer.getFeatures()
for feat in iter:
dtest = actualGeom.distance(feat.geometry())
count += 1
if count < 100000:
if dtest<dmin:
dmin = dtest
if targetFieldName=="$geometry":
dminRes = feat.geometry().asWkt()
elif targetFieldName=="$distance":
dminRes = dmin
elif targetFieldName=="$id":
dminRes = feat.id()
else:
try:
dminRes = feat.attribute(targetFieldName)
except:
parent.setEvalErrorString("error: targetFieldName not present")
return
else:
parent.setEvalErrorString("error: too many features to compare")
dbg.out("DMIN")
dbg.out(dmin)
if count > 0:
try:
return dminRes
except:
return -1
else:
parent.setEvalErrorString("error: no features to compare")
@qgsfunction(3, "Reference", register=False, usesgeometry=True)
def geomdistance(values, feature, parent):
"""
Retrieve target field value from target feature in target layer if target feature is in distance
<h4>Syntax</h4>
<p>geomdistance(<i>'targetLayer','targetField',distanceCheck</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetField</i> → a field in target layer we want as result when source feature is within target feature, for example 'myField'. <br/>
<i> distance</i> → maximum distance from feature to be considered. <br/>
If targetField is equal to '$geometry' The WKT geometry of targetFeature willbe retrieved. If otherwise is equal to '$distance' the calculated distance between source and target features will be returned<br></p>
<i> Number of feature tested is limited to 100000 to avoid time wasting loops</i>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomdistance('targetLayer','TargetField',100) <br>
geomdistance('targetLayer','$geometry',100) <br>
geomdistance('targetLayer','$distance',100) <br>
</p>
"""
dbg=debug()
dbg.out("evaluating geomdistance")
targetLayerName = values[0]
targetFieldName = values[1]
distanceCheck = values[2]
dmin = sys.float_info.max
actualGeom = feature.geometry()
layerSet = _getLayerSet()
if not targetLayerName in layerSet.keys():
parent.setEvalErrorString("error: targetLayer not present")
return
count = 0
for name,layer in layerSet.items():
if layer != iface.mapCanvas().currentLayer() and layer.type() == QgsMapLayer.VectorLayer and (targetLayerName == '' or layer.name() == targetLayerName ):
dbg.out(layer.name())
iter = layer.getFeatures()
for feat in iter:
dtest = actualGeom.distance(feat.geometry())
count += 1
if count < 100000:
if dtest<dmin and dtest<=distanceCheck:
dmin = dtest
if targetFieldName=="$geometry":
dminRes = feat.geometry().asWkt()
elif targetFieldName=="$distance":
dminRes = dmin
elif targetFieldName=="$id":
dminRes = feat.id()
else:
try:
dminRes = feat.attribute(targetFieldName)
except:
parent.setEvalErrorString("error: targetFieldName not present")
return
else:
parent.setEvalErrorString("error: too many features to compare")
dbg.out("DMIN")
dbg.out(dmin)
if count > 0:
try:
return dminRes
except:
return -1
else:
parent.setEvalErrorString("error: no features to compare")
@qgsfunction(2, "Reference", register=False,usesgeometry=True)
def geomwithin(values, feature, parent):
"""
Retrieve target field value when source feature is within target feature in target layer
<h4>Syntax</h4>
<p>geomwithin(<i>targetLayer,targetField</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetField</i> → a field in target layer we want as result when source feature is within target feature, for example 'myField'. If targetField is equal to '$geometry' The WKT geometry of targetFeature willbe retrieved <br></p>
<i> Number of feature tested is limited to 100000 to avoid time wasting loops</i>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomwithin('targetLayer','TargetField') <br>
geomwithin('targetLayer','$geometry') <br>
</p>
"""
dbg=debug()
dbg.out("evaluating geomwithin")
targetLayerName = values[0]
targetFieldName = values[1]
#layerSet = {layer.name():layer for layer in iface.legendInterface().layers()}
layerSet = _getLayerSet()
if not (targetLayerName in layerSet.keys()):
parent.setEvalErrorString("error: targetLayer not present")
return
dbg.out(layerSet[targetLayerName].id())
if layerSet[targetLayerName].type() != QgsMapLayer.VectorLayer:
parent.setEvalErrorString("error: targetLayer is not a vector layer")
return
#fieldSet = [field.name() for field in layerSet[targetLayerName].pendingFields()]
#if not(targetFieldName in fieldSet):
# parent.setEvalErrorString("error: targetFieldName not present")
# return None
count = 0
for feat in layerSet[targetLayerName].getFeatures():
count += 1
if count < 100000:
if feature.geometry().within(feat.geometry()):
dbg.out('OK:'+str(feat.id()))
if targetFieldName=="$geometry":
dminRes = feat.geometry().asWkt()
elif targetFieldName=="$id":
dminRes = feat.id()
else:
try:
dminRes = feat.attribute(targetFieldName)
except:
parent.setEvalErrorString("error: targetFieldName = '%s' not present" % targetFieldName)
return None
else:
parent.setEvalErrorString("error: too many features to compare")
return None
if count > 0:
try:
return dminRes
except:
return None
else:
parent.setEvalErrorString("error: no features to compare")
@qgsfunction(2, "Reference", register=False,usesgeometry=True)
def geomtouches(values, feature, parent):
"""
Retrieve target field value when source feature touches target feature in target layer
<h4>Syntax</h4>
<p>geomtouches(<i>targetLayer,targetField</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetField</i> → a field in target layer we want as result when source feature is within target feature, for example 'myField'. If targetField is equal to '$geometry' The WKT geometry of targetFeature willbe retrieved <br></p>
<i> Number of feature tested is limited to 100000 to avoid time wasting loops</i>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomtouches('targetLayer','TargetField') <br>
geomtouches('targetLayer','$geometry') <br>
</p>
"""
dbg=debug()
dbg.out("evaluating geomtouches")
targetLayerName = values[0]
targetFieldName = values[1]
#layerSet = {layer.name():layer for layer in iface.legendInterface().layers()}
layerSet = _getLayerSet()
if not (targetLayerName in layerSet.keys()):
parent.setEvalErrorString("error: targetLayer not present")
return
if layerSet[targetLayerName].type() != QgsMapLayer.VectorLayer:
parent.setEvalErrorString("error: targetLayer is not a vector layer")
return
count = 0
for feat in layerSet[targetLayerName].getFeatures():
count += 1
if count < 100000:
if feature.geometry().touches(feat.geometry()):
if targetFieldName=="$geometry":
dminRes = feat.geometry().asWkt()
elif targetFieldName=="$id":
dminRes = feat.id()
else:
try:
dminRes = feat.attribute(targetFieldName)
except:
parent.setEvalErrorString("error: targetFieldName not present")
return None
else:
parent.setEvalErrorString("error: too many features to compare")
if count > 0:
try:
return dminRes
except:
return None
else:
parent.setEvalErrorString("error: no features to compare")
@qgsfunction(2, "Reference", register=False,usesgeometry=True)
def geomintersects(values, feature, parent):
"""
Retrieve target field value when source feature intersects target feature in target layer
<h4>Syntax</h4>
<p>geomintersects(<i>targetLayer,targetField</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetField</i> → a field in target layer we want as result when source feature is within target feature, for example 'myField'. If targetField is equal to '$geometry' The WKT geometry of targetFeature willbe retrieved <br></p>
<i> Number of feature tested is limited to 100000 to avoid time wasting loops</i>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomintersects('targetLayer','TargetField') <br>
geomintersects('targetLayer','$geometry') <br>
</p>
"""
dbg=debug()
dbg.out("evaluating geomtouches")
targetLayerName = values[0]
targetFieldName = values[1]
#layerSet = {layer.name():layer for layer in iface.legendInterface().layers()}
layerSet = _getLayerSet()
if not (targetLayerName in layerSet.keys()):
parent.setEvalErrorString("error: targetLayer not present")
return
dbg.out(layerSet)
dbg.out(layerSet[targetLayerName].id())
if layerSet[targetLayerName].type() != QgsMapLayer.VectorLayer:
parent.setEvalErrorString("error: targetLayer is not a vector layer")
return
count = 0
for feat in layerSet[targetLayerName].getFeatures():
count += 1
if count < 100000:
if feature.geometry().intersects(feat.geometry()):
if targetFieldName=="$geometry":
dminRes = feat.geometry().asWkt()
elif targetFieldName=="$id":
dminRes = feat.id()
else:
try:
dminRes = feat.attribute(targetFieldName)
except:
parent.setEvalErrorString("error: targetFieldName not present")
return None
else:
parent.setEvalErrorString("error: too many features to compare")
if count > 0:
try:
return dminRes
except:
return None
else:
parent.setEvalErrorString("error: no features to compare")
@qgsfunction(2, "Reference", register=False, usesgeometry=True)
def geomcontains(values, feature, parent):
"""
Retrieve target field value when source feature contains target feature in target layer
<h4>Syntax</h4>
<p>geomcontains(<i>targetLayer,targetField</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetField</i> → a field in target layer we want as result when source feature is within target feature, for example 'myField'. If targetField is equal to '$geometry' The WKT geometry of targetFeature willbe retrieved <br></p>
<i> Number of feature tested is limited to 100000 to avoid time wasting loops</i>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomcontains('targetLayer','TargetField') <br>
geomcontains('targetLayer','$geometry') <br>
</p>
"""
dbg=debug()
dbg.out("evaluating geomcontains")
targetLayerName = values[0]
targetFieldName = values[1]
#layerSet = {layer.name():layer for layer in iface.legendInterface().layers()}
layerSet = _getLayerSet()
if not (targetLayerName in layerSet.keys()):
parent.setEvalErrorString("error: targetLayer not present")
return
dbg.out(layerSet)
dbg.out(layerSet[targetLayerName].id())
if layerSet[targetLayerName].type() != QgsMapLayer.VectorLayer:
parent.setEvalErrorString("error: targetLayer is not a vector layer")
return
count = 0
for feat in layerSet[targetLayerName].getFeatures():
count += 1
if count < 100000:
if feature.geometry().contains(feat.geometry()):
if targetFieldName=="$geometry":
dminRes = feat.geometry().asWkt()
elif targetFieldName=="$id":
dminRes = feat.id()
else:
try:
dminRes = feat.attribute(targetFieldName)
except:
parent.setEvalErrorString("error: targetFieldName not present")
return None
else:
parent.setEvalErrorString("error: too many features to compare")
if count > 0:
try:
return dminRes
except:
return None
else:
parent.setEvalErrorString("error: no features to compare")
@qgsfunction(2, "Reference", register=False,usesgeometry=True)
def geomdisjoint(values, feature, parent):
"""
Retrieve target field value when source feature is disjoint from target feature in target layer
<h4>Syntax</h4>
<p>geomcontains(<i>targetLayer,targetField</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetField</i> → a field in target layer we want as result when source feature is within target feature, for example 'myField'. If targetField is equal to '$geometry' The WKT geometry of targetFeature willbe retrieved <br></p>
<i> Number of feature tested is limited to 100000 to avoid time wasting loops</i>
<h4>Example</h4>
<p><!-- Show examples of function.-->
geomdisjoint('targetLayer','TargetField') <br>
geomdisjoint('targetLayer','$geometry') <br>
</p>
"""
dbg=debug()
dbg.out("evaluating geomdisjoint")
targetLayerName = values[0]
targetFieldName = values[1]
#layerSet = {layer.name():layer for layer in iface.legendInterface().layers()}
layerSet = _getLayerSet()
if not (targetLayerName in layerSet.keys()):
parent.setEvalErrorString("error: targetLayer not present")
return
if layerSet[targetLayerName].type() != QgsMapLayer.VectorLayer:
parent.setEvalErrorString("error: targetLayer is not a vector layer")
return
count = 0
for feat in layerSet[targetLayerName].getFeatures():
count += 1
if count < 100000:
if feature.geometry().disjoint(feat.geometry()):
if targetFieldName=="$geometry":
dminRes = feat.geometry().asWkt()
elif targetFieldName=="$id":
dminRes = feat.id()
else:
try:
dminRes = feat.attribute(targetFieldName)
except:
parent.setEvalErrorString("error: targetFieldName not present")
return None
else:
parent.setEvalErrorString("error: too many features to compare")
if count > 0:
try:
return dminRes
except:
return None
else:
parent.setEvalErrorString("error: no features to compare")
@qgsfunction(2, "Reference", register=False,usesgeometry=True)
def geomequals(values, feature, parent):
"""
Retrieve target field value when source feature is equal to target feature in target layer
<h4>Syntax</h4>
<p>geomequals(<i>targetLayer,targetField</i>)</p>
<h4>Arguments</h4>
<p><i> targetLayer</i> → the name of a currently loaded layer, for example 'myLayer'.<br>
<i> targetField</i> → a field in target layer we want as result when source feature is within target feature, for example 'myField'. If targetField is equal to '$geometry' The WKT geometry of targetFeature willbe retrieved <br></p>