/
qgsgeometryanalyzer.cpp
1529 lines (1373 loc) · 39.2 KB
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qgsgeometryanalyzer.cpp
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/***************************************************************************
qgsgeometryanalyzer.cpp - QGIS Tools for vector geometry analysis
-------------------
begin : 19 March 2009
copyright : (C) Carson Farmer
email : carson.farmer@gmail.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. *
* *
***************************************************************************/
#include "qgsgeometryanalyzer.h"
#include "qgsapplication.h"
#include "qgsfield.h"
#include "qgsfeature.h"
#include "qgslogger.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsvectorfilewriter.h"
#include "qgsvectordataprovider.h"
#include "qgsdistancearea.h"
#include <QProgressDialog>
bool QgsGeometryAnalyzer::simplify( QgsVectorLayer* layer,
const QString& shapefileName,
double tolerance,
bool onlySelectedFeatures,
QProgressDialog *p )
{
if ( !layer )
{
return false;
}
QgsVectorDataProvider* dp = layer->dataProvider();
if ( !dp )
{
return false;
}
QGis::WkbType outputType = dp->geometryType();
const QgsCoordinateReferenceSystem crs = layer->crs();
QgsVectorFileWriter vWriter( shapefileName, dp->encoding(), layer->pendingFields(), outputType, &crs );
QgsFeature currentFeature;
//take only selection
if ( onlySelectedFeatures )
{
//use QgsVectorLayer::featureAtId
const QgsFeatureIds selection = layer->selectedFeaturesIds();
if ( p )
{
p->setMaximum( selection.size() );
}
int processedFeatures = 0;
QgsFeatureIds::const_iterator it = selection.constBegin();
for ( ; it != selection.constEnd(); ++it )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( !layer->featureAtId( *it, currentFeature, true, true ) )
{
continue;
}
simplifyFeature( currentFeature, &vWriter, tolerance );
++processedFeatures;
}
if ( p )
{
p->setValue( selection.size() );
}
}
//take all features
else
{
layer->select( layer->pendingAllAttributesList(), QgsRectangle(), true, false );
int featureCount = layer->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
int processedFeatures = 0;
while ( layer->nextFeature( currentFeature ) )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
break;
}
simplifyFeature( currentFeature, &vWriter, tolerance );
++processedFeatures;
}
if ( p )
{
p->setValue( featureCount );
}
}
return true;
}
void QgsGeometryAnalyzer::simplifyFeature( QgsFeature& f, QgsVectorFileWriter* vfw, double tolerance )
{
QgsGeometry* featureGeometry = f.geometry();
QgsGeometry* tmpGeometry = 0;
if ( !featureGeometry )
{
return;
}
// simplify feature
tmpGeometry = featureGeometry->simplify( tolerance );
QgsFeature newFeature;
newFeature.setGeometry( tmpGeometry );
newFeature.setAttributes( f.attributes() );
//add it to vector file writer
if ( vfw )
{
vfw->addFeature( newFeature );
}
}
bool QgsGeometryAnalyzer::centroids( QgsVectorLayer* layer, const QString& shapefileName,
bool onlySelectedFeatures, QProgressDialog* p )
{
if ( !layer )
{
QgsDebugMsg( "No layer passed to centroids" );
return false;
}
QgsVectorDataProvider* dp = layer->dataProvider();
if ( !dp )
{
QgsDebugMsg( "No data provider for layer passed to centroids" );
return false;
}
QGis::WkbType outputType = QGis::WKBPoint;
const QgsCoordinateReferenceSystem crs = layer->crs();
QgsVectorFileWriter vWriter( shapefileName, dp->encoding(), layer->pendingFields(), outputType, &crs );
QgsFeature currentFeature;
//take only selection
if ( onlySelectedFeatures )
{
//use QgsVectorLayer::featureAtId
const QgsFeatureIds selection = layer->selectedFeaturesIds();
if ( p )
{
p->setMaximum( selection.size() );
}
int processedFeatures = 0;
QgsFeatureIds::const_iterator it = selection.constBegin();
for ( ; it != selection.constEnd(); ++it )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( !layer->featureAtId( *it, currentFeature, true, true ) )
{
continue;
}
centroidFeature( currentFeature, &vWriter );
++processedFeatures;
}
if ( p )
{
p->setValue( selection.size() );
}
}
//take all features
else
{
layer->select( layer->pendingAllAttributesList(), QgsRectangle(), true, false );
int featureCount = layer->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
int processedFeatures = 0;
while ( layer->nextFeature( currentFeature ) )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
break;
}
centroidFeature( currentFeature, &vWriter );
++processedFeatures;
}
if ( p )
{
p->setValue( featureCount );
}
}
return true;
}
void QgsGeometryAnalyzer::centroidFeature( QgsFeature& f, QgsVectorFileWriter* vfw )
{
QgsGeometry* featureGeometry = f.geometry();
QgsGeometry* tmpGeometry = 0;
if ( !featureGeometry )
{
return;
}
tmpGeometry = featureGeometry->centroid();
QgsFeature newFeature;
newFeature.setGeometry( tmpGeometry );
newFeature.setAttributes( f.attributes() );
//add it to vector file writer
if ( vfw )
{
vfw->addFeature( newFeature );
}
}
bool QgsGeometryAnalyzer::extent( QgsVectorLayer* layer,
const QString& shapefileName,
bool onlySelectedFeatures,
QProgressDialog * )
{
if ( !layer )
{
return false;
}
QgsVectorDataProvider* dp = layer->dataProvider();
if ( !dp )
{
return false;
}
QGis::WkbType outputType = QGis::WKBPolygon;
const QgsCoordinateReferenceSystem crs = layer->crs();
QgsFields fields;
fields.append( QgsField( QString( "MINX" ), QVariant::Double ) );
fields.append( QgsField( QString( "MINY" ), QVariant::Double ) );
fields.append( QgsField( QString( "MAXX" ), QVariant::Double ) );
fields.append( QgsField( QString( "MAXY" ), QVariant::Double ) );
fields.append( QgsField( QString( "CNTX" ), QVariant::Double ) );
fields.append( QgsField( QString( "CNTY" ), QVariant::Double ) );
fields.append( QgsField( QString( "AREA" ), QVariant::Double ) );
fields.append( QgsField( QString( "PERIM" ), QVariant::Double ) );
fields.append( QgsField( QString( "HEIGHT" ), QVariant::Double ) );
fields.append( QgsField( QString( "WIDTH" ), QVariant::Double ) );
QgsVectorFileWriter vWriter( shapefileName, dp->encoding(), fields, outputType, &crs );
QgsRectangle rect;
if ( onlySelectedFeatures ) // take only selection
{
rect = layer->boundingBoxOfSelected();
}
else
{
rect = layer->extent();
}
double minx = rect.xMinimum();
double miny = rect.yMinimum();
double maxx = rect.xMaximum();
double maxy = rect.yMaximum();
double height = rect.height();
double width = rect.width();
double cntx = minx + ( width / 2.0 );
double cnty = miny + ( height / 2.0 );
double area = width * height;
double perim = ( 2 * width ) + ( 2 * height );
QgsFeature feat;
QgsAttributes attrs( 10 );
attrs[0] = QVariant( minx );
attrs[1] = QVariant( miny );
attrs[2] = QVariant( maxx );
attrs[3] = QVariant( maxy );
attrs[4] = QVariant( cntx );
attrs[5] = QVariant( cnty );
attrs[6] = QVariant( area );
attrs[7] = QVariant( perim );
attrs[8] = QVariant( height );
attrs[9] = QVariant( width );
feat.setAttributes( attrs );
feat.setGeometry( QgsGeometry::fromRect( rect ) );
vWriter.addFeature( feat );
return true;
}
QList<double> QgsGeometryAnalyzer::simpleMeasure( QgsGeometry* mpGeometry )
{
QList<double> list;
double perim;
if ( mpGeometry->wkbType() == QGis::WKBPoint )
{
QgsPoint pt = mpGeometry->asPoint();
list.append( pt.x() );
list.append( pt.y() );
}
else
{
QgsDistanceArea measure;
list.append( measure.measure( mpGeometry ) );
if ( mpGeometry->type() == QGis::Polygon )
{
perim = perimeterMeasure( mpGeometry, measure );
list.append( perim );
}
}
return list;
}
double QgsGeometryAnalyzer::perimeterMeasure( QgsGeometry* geometry, QgsDistanceArea& measure )
{
double value = 0.00;
if ( geometry->isMultipart() )
{
QgsMultiPolygon poly = geometry->asMultiPolygon();
QgsMultiPolygon::iterator it;
QgsPolygon::iterator jt;
for ( it = poly.begin(); it != poly.end(); ++it )
{
for ( jt = it->begin(); jt != it->end(); ++jt )
{
value = value + measure.measure( QgsGeometry::fromPolyline( *jt ) );
}
}
}
else
{
QgsPolygon::iterator jt;
QgsPolygon poly = geometry->asPolygon();
for ( jt = poly.begin(); jt != poly.end(); ++jt )
{
value = value + measure.measure( QgsGeometry::fromPolyline( *jt ) );
}
}
return value;
}
bool QgsGeometryAnalyzer::convexHull( QgsVectorLayer* layer, const QString& shapefileName,
bool onlySelectedFeatures, int uniqueIdField, QProgressDialog* p )
{
if ( !layer )
{
return false;
}
QgsVectorDataProvider* dp = layer->dataProvider();
if ( !dp )
{
return false;
}
bool useField = false;
if ( uniqueIdField == -1 )
{
uniqueIdField = 0;
}
else
{
useField = true;
}
QgsFields fields;
fields.append( QgsField( QString( "UID" ), QVariant::String ) );
fields.append( QgsField( QString( "AREA" ), QVariant::Double ) );
fields.append( QgsField( QString( "PERIM" ), QVariant::Double ) );
QGis::WkbType outputType = QGis::WKBPolygon;
const QgsCoordinateReferenceSystem crs = layer->crs();
QgsVectorFileWriter vWriter( shapefileName, dp->encoding(), fields, outputType, &crs );
QgsFeature currentFeature;
QgsGeometry* dissolveGeometry = 0; //dissolve geometry
QMultiMap<QString, QgsFeatureId> map;
if ( onlySelectedFeatures )
{
//use QgsVectorLayer::featureAtId
const QgsFeatureIds selection = layer->selectedFeaturesIds();
QgsFeatureIds::const_iterator it = selection.constBegin();
for ( ; it != selection.constEnd(); ++it )
{
#if 0
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
// break; // it may be better to do something else here?
return false;
}
#endif
if ( !layer->featureAtId( *it, currentFeature, true, true ) )
{
continue;
}
map.insert( currentFeature.attribute( uniqueIdField ).toString(), currentFeature.id() );
}
}
else
{
layer->select( layer->pendingAllAttributesList(), QgsRectangle(), true, false );
while ( layer->nextFeature( currentFeature ) )
{
#if 0
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
// break; // it may be better to do something else here?
return false;
}
#endif
map.insert( currentFeature.attribute( uniqueIdField ).toString(), currentFeature.id() );
}
}
QMultiMap<QString, QgsFeatureId>::const_iterator jt = map.constBegin();
while ( jt != map.constEnd() )
{
QString currentKey = jt.key();
int processedFeatures = 0;
//take only selection
if ( onlySelectedFeatures )
{
//use QgsVectorLayer::featureAtId
const QgsFeatureIds selection = layer->selectedFeaturesIds();
if ( p )
{
p->setMaximum( selection.size() );
}
processedFeatures = 0;
while ( jt != map.constEnd() && ( jt.key() == currentKey || !useField ) )
{
if ( p && p->wasCanceled() )
{
break;
}
if ( selection.contains( jt.value() ) )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( !layer->featureAtId( jt.value(), currentFeature, true, true ) )
{
continue;
}
convexFeature( currentFeature, processedFeatures, &dissolveGeometry );
++processedFeatures;
}
++jt;
}
QList<double> values;
if ( !dissolveGeometry )
{
QgsDebugMsg( "no dissolved geometry - should not happen" );
return false;
}
dissolveGeometry = dissolveGeometry->convexHull();
values = simpleMeasure( dissolveGeometry );
QgsAttributes attributes( 3 );
attributes[0] = QVariant( currentKey );
attributes[1] = values[ 0 ];
attributes[2] = values[ 1 ];
QgsFeature dissolveFeature;
dissolveFeature.setAttributes( attributes );
dissolveFeature.setGeometry( dissolveGeometry );
vWriter.addFeature( dissolveFeature );
}
//take all features
else
{
int featureCount = layer->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
processedFeatures = 0;
while ( jt != map.constEnd() && ( jt.key() == currentKey || !useField ) )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( !layer->featureAtId( jt.value(), currentFeature, true, true ) )
{
continue;
}
convexFeature( currentFeature, processedFeatures, &dissolveGeometry );
++processedFeatures;
++jt;
}
QList<double> values;
// QgsGeometry* tmpGeometry = 0;
if ( !dissolveGeometry )
{
QgsDebugMsg( "no dissolved geometry - should not happen" );
return false;
}
dissolveGeometry = dissolveGeometry->convexHull();
// values = simpleMeasure( tmpGeometry );
values = simpleMeasure( dissolveGeometry );
QgsAttributes attributes;
attributes[0] = QVariant( currentKey );
attributes[1] = QVariant( values[ 0 ] );
attributes[2] = QVariant( values[ 1 ] );
QgsFeature dissolveFeature;
dissolveFeature.setAttributes( attributes );
dissolveFeature.setGeometry( dissolveGeometry );
vWriter.addFeature( dissolveFeature );
}
}
return true;
}
void QgsGeometryAnalyzer::convexFeature( QgsFeature& f, int nProcessedFeatures, QgsGeometry** dissolveGeometry )
{
QgsGeometry* featureGeometry = f.geometry();
QgsGeometry* tmpGeometry = 0;
QgsGeometry* convexGeometry = 0;
if ( !featureGeometry )
{
return;
}
convexGeometry = featureGeometry->convexHull();
if ( nProcessedFeatures == 0 )
{
*dissolveGeometry = convexGeometry;
}
else
{
tmpGeometry = *dissolveGeometry;
*dissolveGeometry = ( *dissolveGeometry )->combine( convexGeometry );
delete tmpGeometry;
delete convexGeometry;
}
}
bool QgsGeometryAnalyzer::dissolve( QgsVectorLayer* layer, const QString& shapefileName,
bool onlySelectedFeatures, int uniqueIdField, QProgressDialog* p )
{
if ( !layer )
{
return false;
}
QgsVectorDataProvider* dp = layer->dataProvider();
if ( !dp )
{
return false;
}
bool useField = false;
if ( uniqueIdField == -1 )
{
uniqueIdField = 0;
}
else
{
useField = true;
}
QGis::WkbType outputType = dp->geometryType();
const QgsCoordinateReferenceSystem crs = layer->crs();
QgsVectorFileWriter vWriter( shapefileName, dp->encoding(), layer->pendingFields(), outputType, &crs );
QgsFeature currentFeature;
QMultiMap<QString, QgsFeatureId> map;
if ( onlySelectedFeatures )
{
//use QgsVectorLayer::featureAtId
const QgsFeatureIds selection = layer->selectedFeaturesIds();
QgsFeatureIds::const_iterator it = selection.constBegin();
for ( ; it != selection.constEnd(); ++it )
{
if ( !layer->featureAtId( *it, currentFeature, true, true ) )
{
continue;
}
map.insert( currentFeature.attribute( uniqueIdField ).toString(), currentFeature.id() );
}
}
else
{
layer->select( layer->pendingAllAttributesList(), QgsRectangle(), true, false );
while ( layer->nextFeature( currentFeature ) )
{
map.insert( currentFeature.attribute( uniqueIdField ).toString(), currentFeature.id() );
}
}
QgsGeometry *dissolveGeometry = 0; //dissolve geometry
QMultiMap<QString, QgsFeatureId>::const_iterator jt = map.constBegin();
QgsFeature outputFeature;
while ( jt != map.constEnd() )
{
QString currentKey = jt.key();
int processedFeatures = 0;
bool first = true;
//take only selection
if ( onlySelectedFeatures )
{
//use QgsVectorLayer::featureAtId
const QgsFeatureIds selection = layer->selectedFeaturesIds();
if ( p )
{
p->setMaximum( selection.size() );
}
while ( jt != map.constEnd() && ( jt.key() == currentKey || !useField ) )
{
if ( p && p->wasCanceled() )
{
break;
}
if ( selection.contains( jt.value() ) )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( !layer->featureAtId( jt.value(), currentFeature, true, true ) )
{
continue;
}
if ( first )
{
outputFeature.setAttributes( currentFeature.attributes() );
first = false;
}
dissolveFeature( currentFeature, processedFeatures, &dissolveGeometry );
++processedFeatures;
}
++jt;
}
}
//take all features
else
{
int featureCount = layer->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
while ( jt != map.constEnd() && ( jt.key() == currentKey || !useField ) )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( !layer->featureAtId( jt.value(), currentFeature, true, true ) )
{
continue;
}
{
outputFeature.setAttributes( currentFeature.attributes() );
first = false;
}
dissolveFeature( currentFeature, processedFeatures, &dissolveGeometry );
++processedFeatures;
++jt;
}
}
outputFeature.setGeometry( dissolveGeometry );
vWriter.addFeature( outputFeature );
}
return true;
}
void QgsGeometryAnalyzer::dissolveFeature( QgsFeature& f, int nProcessedFeatures, QgsGeometry** dissolveGeometry )
{
QgsGeometry* featureGeometry = f.geometry();
if ( !featureGeometry )
{
return;
}
if ( nProcessedFeatures == 0 )
{
int geomSize = featureGeometry->wkbSize();
*dissolveGeometry = new QgsGeometry();
unsigned char* wkb = new unsigned char[geomSize];
memcpy( wkb, featureGeometry->asWkb(), geomSize );
( *dissolveGeometry )->fromWkb( wkb, geomSize );
}
else
{
*dissolveGeometry = ( *dissolveGeometry )->combine( featureGeometry );
}
}
bool QgsGeometryAnalyzer::buffer( QgsVectorLayer* layer, const QString& shapefileName, double bufferDistance,
bool onlySelectedFeatures, bool dissolve, int bufferDistanceField, QProgressDialog* p )
{
if ( !layer )
{
return false;
}
QgsVectorDataProvider* dp = layer->dataProvider();
if ( !dp )
{
return false;
}
QGis::WkbType outputType = QGis::WKBPolygon;
if ( dissolve )
{
outputType = QGis::WKBMultiPolygon;
}
const QgsCoordinateReferenceSystem crs = layer->crs();
QgsVectorFileWriter vWriter( shapefileName, dp->encoding(), layer->pendingFields(), outputType, &crs );
QgsFeature currentFeature;
QgsGeometry *dissolveGeometry = 0; //dissolve geometry (if dissolve enabled)
//take only selection
if ( onlySelectedFeatures )
{
//use QgsVectorLayer::featureAtId
const QgsFeatureIds selection = layer->selectedFeaturesIds();
if ( p )
{
p->setMaximum( selection.size() );
}
int processedFeatures = 0;
QgsFeatureIds::const_iterator it = selection.constBegin();
for ( ; it != selection.constEnd(); ++it )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( !layer->featureAtId( *it, currentFeature, true, true ) )
{
continue;
}
bufferFeature( currentFeature, processedFeatures, &vWriter, dissolve, &dissolveGeometry, bufferDistance, bufferDistanceField );
++processedFeatures;
}
if ( p )
{
p->setValue( selection.size() );
}
}
//take all features
else
{
layer->select( layer->pendingAllAttributesList(), QgsRectangle(), true, false );
int featureCount = layer->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
int processedFeatures = 0;
while ( layer->nextFeature( currentFeature ) )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
break;
}
bufferFeature( currentFeature, processedFeatures, &vWriter, dissolve, &dissolveGeometry, bufferDistance, bufferDistanceField );
++processedFeatures;
}
if ( p )
{
p->setValue( featureCount );
}
}
if ( dissolve )
{
QgsFeature dissolveFeature;
if ( !dissolveGeometry )
{
QgsDebugMsg( "no dissolved geometry - should not happen" );
return false;
}
dissolveFeature.setGeometry( dissolveGeometry );
vWriter.addFeature( dissolveFeature );
}
return true;
}
void QgsGeometryAnalyzer::bufferFeature( QgsFeature& f, int nProcessedFeatures, QgsVectorFileWriter* vfw, bool dissolve,
QgsGeometry** dissolveGeometry, double bufferDistance, int bufferDistanceField )
{
double currentBufferDistance;
QgsGeometry* featureGeometry = f.geometry();
QgsGeometry* tmpGeometry = 0;
QgsGeometry* bufferGeometry = 0;
if ( !featureGeometry )
{
return;
}
//create buffer
if ( bufferDistanceField == -1 )
{
currentBufferDistance = bufferDistance;
}
else
{
currentBufferDistance = f.attribute( bufferDistanceField ).toDouble();
}
bufferGeometry = featureGeometry->buffer( currentBufferDistance, 5 );
if ( dissolve )
{
if ( nProcessedFeatures == 0 )
{
*dissolveGeometry = bufferGeometry;
}
else
{
tmpGeometry = *dissolveGeometry;
*dissolveGeometry = ( *dissolveGeometry )->combine( bufferGeometry );
delete tmpGeometry;
delete bufferGeometry;
}
}
else //dissolve
{
QgsFeature newFeature;
newFeature.setGeometry( bufferGeometry );
newFeature.setAttributes( f.attributes() );
//add it to vector file writer
if ( vfw )
{
vfw->addFeature( newFeature );
}
}
}
bool QgsGeometryAnalyzer::eventLayer( QgsVectorLayer* lineLayer, QgsVectorLayer* eventLayer, int lineField, int eventField, QList<int>& unlocatedFeatureIds, const QString& outputLayer,
const QString& outputFormat, int locationField1, int locationField2, int offsetField, double offsetScale,
bool forceSingleGeometry, QgsVectorDataProvider* memoryProvider, QProgressDialog* p )
{
if ( !lineLayer || !eventLayer || !lineLayer->isValid() || !eventLayer->isValid() )
{
return false;
}
//create line field / id map for line layer
QMultiHash< QString, QgsFeatureId > lineLayerIdMap; //1:n possible (e.g. several linear reference geometries for one feature in the event layer)
lineLayer->select( QgsAttributeList() << lineField,
QgsRectangle(), false, false );
QgsFeature fet;
while ( lineLayer->nextFeature( fet ) )
{
lineLayerIdMap.insert( fet.attribute( lineField ).toString(), fet.id() );
}
//create output datasource or attributes in memory provider
QgsVectorFileWriter* fileWriter = 0;
QgsFeatureList memoryProviderFeatures;
if ( !memoryProvider )
{
QGis::WkbType memoryProviderType = QGis::WKBMultiLineString;
if ( locationField2 == -1 )
{
memoryProviderType = forceSingleGeometry ? QGis::WKBPoint : QGis::WKBMultiPoint;
}
else
{
memoryProviderType = forceSingleGeometry ? QGis::WKBLineString : QGis::WKBMultiLineString;
}
fileWriter = new QgsVectorFileWriter( outputLayer,
eventLayer->dataProvider()->encoding(),
eventLayer->pendingFields(),
memoryProviderType,
&( lineLayer->crs() ),
outputFormat );
}
else
{
memoryProvider->addAttributes( eventLayer->pendingFields().toList() );
}
//iterate over eventLayer and write new features to output file or layer
eventLayer->select( eventLayer->pendingAllAttributesList(), QgsRectangle(), false, false );
QgsGeometry* lrsGeom = 0;
QgsFeature lineFeature;
double measure1, measure2 = 0.0;
int nEventFeatures = eventLayer->pendingFeatureCount();
int featureCounter = 0;
int nOutputFeatures = 0; //number of output features for the current event feature
if ( p )
{
p->setWindowModality( Qt::WindowModal );
p->setMinimum( 0 );
p->setMaximum( nEventFeatures );
p->show();
}
while ( eventLayer->nextFeature( fet ) )
{
nOutputFeatures = 0;
//update progress dialog
if ( p )
{
if ( p->wasCanceled() )
{
break;
}
p->setValue( featureCounter );
++featureCounter;
}
measure1 = fet.attribute( locationField1 ).toDouble();
if ( locationField2 != -1 )
{
measure2 = fet.attribute( locationField2 ).toDouble();
}
QList<QgsFeatureId> featureIdList = lineLayerIdMap.values( fet.attribute( eventField ).toString() );
QList<QgsFeatureId>::const_iterator featureIdIt = featureIdList.constBegin();
for ( ; featureIdIt != featureIdList.constEnd(); ++featureIdIt )
{
if ( !lineLayer->featureAtId( *featureIdIt, lineFeature, true, false ) )
{