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qgsvectorlayer.cpp
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qgsvectorlayer.cpp
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/***************************************************************************
qgsvectorlayer.cpp
This class implements a generic means to display vector layers. The features
and attributes are read from the data store using a "data provider" plugin.
QgsVectorLayer can be used with any data store for which an appropriate
plugin is available.
-------------------
begin : Oct 29, 2003
copyright : (C) 2003 by Gary E.Sherman
email : sherman at mrcc.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. *
* *
***************************************************************************/
/* $Id$ */
#include <cassert>
#include <cfloat>
#include <cstring>
#include <climits>
#include <cmath>
#include <iosfwd>
#include <limits>
#include <memory>
#include <set>
#include <sstream>
#include <utility>
#include <QImage>
#include <QPainter>
#include <QPainterPath>
#include <QPolygonF>
#include <QSettings>
#include <QString>
#include "qgsvectorlayer.h"
// renderers
#include "qgscontinuouscolorrenderer.h"
#include "qgsgraduatedsymbolrenderer.h"
#include "qgsrenderer.h"
#include "qgssinglesymbolrenderer.h"
#include "qgsuniquevaluerenderer.h"
#include "qgsattributeaction.h"
#include "qgis.h" //for globals
#include "qgsapplication.h"
#include "qgscoordinatetransform.h"
#include "qgsfeature.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include "qgslabel.h"
#include "qgslogger.h"
#include "qgsmaptopixel.h"
#include "qgspoint.h"
#include "qgsproviderregistry.h"
#include "qgsrectangle.h"
#include "qgsrendercontext.h"
#include "qgssinglesymbolrenderer.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsvectordataprovider.h"
#include "qgsvectorlayerundocommand.h"
#include "qgsvectoroverlay.h"
#include "qgslogger.h"
#include "qgsmaplayerregistry.h"
#ifdef Q_WS_X11
#include "qgsclipper.h"
#endif
#ifdef TESTPROVIDERLIB
#include <dlfcn.h>
#endif
static const char * const ident_ = "$Id$";
// typedef for the QgsDataProvider class factory
typedef QgsDataProvider * create_it( const QString* uri );
QgsVectorLayer::QgsVectorLayer( QString vectorLayerPath,
QString baseName,
QString providerKey,
bool loadDefaultStyleFlag )
: QgsMapLayer( VectorLayer, baseName, vectorLayerPath ),
mUpdateThreshold( 0 ), // XXX better default value?
mDataProvider( NULL ),
mProviderKey( providerKey ),
mEditable( false ),
mModified( false ),
mMaxUpdatedIndex( -1 ),
mRenderer( 0 ),
mLabel( 0 ),
mLabelOn( false ),
mVertexMarkerOnlyForSelection( false ),
mFetching( false ),
mActiveCommand( NULL )
{
mActions = new QgsAttributeAction;
// if we're given a provider type, try to create and bind one to this layer
if ( ! mProviderKey.isEmpty() )
{
setDataProvider( mProviderKey );
}
if ( mValid )
{
// Always set crs
setCoordinateSystem();
// check if there is a default style / propertysheet defined
// for this layer and if so apply it
//
if ( loadDefaultStyleFlag )
{
bool defaultLoadedFlag = false;
loadDefaultStyle( defaultLoadedFlag );
if ( !defaultLoadedFlag )
{
// add single symbol renderer as default
QgsSingleSymbolRenderer *renderer = new QgsSingleSymbolRenderer( geometryType() );
setRenderer( renderer );
}
}
else // Otherwise use some very basic defaults
{
// add single symbol renderer as default
QgsSingleSymbolRenderer *renderer = new QgsSingleSymbolRenderer( geometryType() );
setRenderer( renderer );
}
// Get the update threshold from user settings. We
// do this only on construction to avoid the penality of
// fetching this each time the layer is drawn. If the user
// changes the threshold from the preferences dialog, it will
// have no effect on existing layers
// TODO: load this setting somewhere else [MD]
//QSettings settings;
//mUpdateThreshold = settings.readNumEntry("Map/updateThreshold", 1000);
}
} // QgsVectorLayer ctor
QgsVectorLayer::~QgsVectorLayer()
{
QgsDebugMsg( "In QgsVectorLayer destructor" );
emit layerDeleted();
mValid = false;
if ( mRenderer )
{
delete mRenderer;
}
// delete the provider object
delete mDataProvider;
delete mLabel;
// Destroy any cached geometries and clear the references to them
deleteCachedGeometries();
delete mActions;
//delete remaining overlays
QList<QgsVectorOverlay*>::iterator overlayIt = mOverlays.begin();
for ( ; overlayIt != mOverlays.end(); ++overlayIt )
{
delete *overlayIt;
}
}
QString QgsVectorLayer::storageType() const
{
if ( mDataProvider )
{
return mDataProvider->storageType();
}
return 0;
}
QString QgsVectorLayer::capabilitiesString() const
{
if ( mDataProvider )
{
return mDataProvider->capabilitiesString();
}
return 0;
}
QString QgsVectorLayer::dataComment() const
{
if ( mDataProvider )
{
return mDataProvider->dataComment();
}
return QString();
}
QString QgsVectorLayer::providerType() const
{
return mProviderKey;
}
/**
* sets the preferred display field based on some fuzzy logic
*/
void QgsVectorLayer::setDisplayField( QString fldName )
{
// If fldName is provided, use it as the display field, otherwise
// determine the field index for the feature column of the identify
// dialog. We look for fields containing "name" first and second for
// fields containing "id". If neither are found, the first field
// is used as the node.
QString idxName = "";
QString idxId = "";
if ( !fldName.isEmpty() )
{
mDisplayField = fldName;
}
else
{
const QgsFieldMap &fields = pendingFields();
int fieldsSize = fields.size();
for ( QgsFieldMap::const_iterator it = fields.begin(); it != fields.end(); ++it )
{
QString fldName = it.value().name();
QgsDebugMsg( "Checking field " + fldName + " of " + QString::number( fieldsSize ) + " total" );
// Check the fields and keep the first one that matches.
// We assume that the user has organized the data with the
// more "interesting" field names first. As such, name should
// be selected before oldname, othername, etc.
if ( fldName.indexOf( "name", false ) > -1 )
{
if ( idxName.isEmpty() )
{
idxName = fldName;
}
}
if ( fldName.indexOf( "descrip", false ) > -1 )
{
if ( idxName.isEmpty() )
{
idxName = fldName;
}
}
if ( fldName.indexOf( "id", false ) > -1 )
{
if ( idxId.isEmpty() )
{
idxId = fldName;
}
}
}
//if there were no fields in the dbf just return - otherwise qgis segfaults!
if ( fieldsSize == 0 )
return;
if ( idxName.length() > 0 )
{
mDisplayField = idxName;
}
else
{
if ( idxId.length() > 0 )
{
mDisplayField = idxId;
}
else
{
mDisplayField = fields[0].name();
}
}
}
}
// NOTE this is a temporary method added by Tim to prevent label clipping
// which was occurring when labeller was called in the main draw loop
// This method will probably be removed again in the near future!
void QgsVectorLayer::drawLabels( QgsRenderContext& rendererContext )
{
QgsDebugMsg( "Starting draw of labels" );
if ( mRenderer && mLabelOn &&
( !label()->scaleBasedVisibility() ||
( label()->minScale() <= rendererContext.rendererScale() &&
rendererContext.rendererScale() <= label()->maxScale() ) ) )
{
QgsAttributeList attributes = mRenderer->classificationAttributes();
// Add fields required for labels
mLabel->addRequiredFields( attributes );
QgsDebugMsg( "Selecting features based on view extent" );
int featureCount = 0;
try
{
// select the records in the extent. The provider sets a spatial filter
// and sets up the selection set for retrieval
select( attributes, rendererContext.extent() );
QgsFeature fet;
while ( nextFeature( fet ) )
{
if ( mRenderer->willRenderFeature( &fet ) )
{
bool sel = mSelectedFeatureIds.contains( fet.id() );
mLabel->renderLabel( rendererContext, fet, sel, 0 );
}
featureCount++;
}
}
catch ( QgsCsException &e )
{
Q_UNUSED( e );
QgsLogger::critical( "Error projecting label locations, caught in " + QString( __FILE__ ) + ", line " + QString( __LINE__ ) );
}
#ifdef QGISDEBUG
QgsLogger::debug( "Total features processed", featureCount, 1, __FILE__, __FUNCTION__, __LINE__ );
#endif
// XXX Something in our draw event is triggering an additional draw event when resizing [TE 01/26/06]
// XXX Calling this will begin processing the next draw event causing image havoc and recursion crashes.
//qApp->processEvents();
}
}
unsigned char *QgsVectorLayer::drawLineString( unsigned char *feature, QgsRenderContext &renderContext )
{
QPainter *p = renderContext.painter();
unsigned char *ptr = feature + 5;
unsigned int wkbType = *(( int* )( feature + 1 ) );
unsigned int nPoints = *(( int* )ptr );
ptr = feature + 9;
bool hasZValue = ( wkbType == QGis::WKBLineString25D );
std::vector<double> x( nPoints );
std::vector<double> y( nPoints );
std::vector<double> z( nPoints, 0.0 );
// Extract the points from the WKB format into the x and y vectors.
for ( register unsigned int i = 0; i < nPoints; ++i )
{
x[i] = *(( double * ) ptr );
ptr += sizeof( double );
y[i] = *(( double * ) ptr );
ptr += sizeof( double );
if ( hasZValue ) // ignore Z value
ptr += sizeof( double );
}
// Transform the points into map coordinates (and reproject if
// necessary)
transformPoints( x, y, z, renderContext );
#if defined(Q_WS_X11)
// Work around a +/- 32768 limitation on coordinates in X11
// Look through the x and y coordinates and see if there are any
// that need trimming. If one is found, there's no need to look at
// the rest of them so end the loop at that point.
for ( register unsigned int i = 0; i < nPoints; ++i )
{
if ( std::abs( x[i] ) > QgsClipper::MAX_X ||
std::abs( y[i] ) > QgsClipper::MAX_Y )
{
QgsClipper::trimFeature( x, y, true ); // true = polyline
nPoints = x.size(); // trimming may change nPoints.
break;
}
}
#endif
// set up QPolygonF class with transformed points
QPolygonF pa( nPoints );
for ( register unsigned int i = 0; i < nPoints; ++i )
{
pa[i].setX( x[i] );
pa[i].setY( y[i] );
}
#ifdef QGISDEBUGVERBOSE
// this is only used for verbose debug output
for ( int i = 0; i < pa.size(); ++i )
{
QgsDebugMsgLevel( "pa" + QString::number( pa.point( i ).x() ), 2 );
QgsDebugMsgLevel( "pa" + QString::number( pa.point( i ).y() ), 2 );
}
#endif
// The default pen gives bevelled joins between segements of the
// polyline, which is good enough for the moment.
//preserve a copy of the pen before we start fiddling with it
QPen pen = p->pen(); // to be kept original
//
// experimental alpha transparency
// 255 = opaque
//
QPen myTransparentPen = p->pen(); // store current pen
QColor myColor = myTransparentPen.color();
//only set transparency from layer level if renderer does not provide
//transparency on class level
if ( !mRenderer->usesTransparency() )
{
myColor.setAlpha( mTransparencyLevel );
}
myTransparentPen.setColor( myColor );
p->setPen( myTransparentPen );
p->drawPolyline( pa );
// draw vertex markers if in editing mode, but only to the main canvas
if ( mEditable && renderContext.drawEditingInformation() )
{
std::vector<double>::const_iterator xIt;
std::vector<double>::const_iterator yIt;
for ( xIt = x.begin(), yIt = y.begin(); xIt != x.end(); ++xIt, ++yIt )
{
drawVertexMarker(( int )( *xIt ), ( int )( *yIt ), *p, mCurrentVertexMarkerType );
}
}
//restore the pen
p->setPen( pen );
return ptr;
}
unsigned char *QgsVectorLayer::drawPolygon( unsigned char *feature, QgsRenderContext &renderContext )
{
QPainter *p = renderContext.painter();
typedef std::pair<std::vector<double>, std::vector<double> > ringType;
typedef ringType* ringTypePtr;
typedef std::vector<ringTypePtr> ringsType;
// get number of rings in the polygon
unsigned int numRings = *(( int* )( feature + 1 + sizeof( int ) ) );
if ( numRings == 0 ) // sanity check for zero rings in polygon
return feature + 9;
unsigned int wkbType = *(( int* )( feature + 1 ) );
bool hasZValue = ( wkbType == QGis::WKBPolygon25D );
int total_points = 0;
// A vector containing a pointer to a pair of double vectors.The
// first vector in the pair contains the x coordinates, and the
// second the y coordinates.
ringsType rings;
// Set pointer to the first ring
unsigned char* ptr = feature + 1 + 2 * sizeof( int );
for ( register unsigned int idx = 0; idx < numRings; idx++ )
{
unsigned int nPoints = *(( int* )ptr );
ringTypePtr ring = new ringType( std::vector<double>( nPoints ), std::vector<double>( nPoints ) );
ptr += 4;
// create a dummy vector for the z coordinate
std::vector<double> zVector( nPoints, 0.0 );
// Extract the points from the WKB and store in a pair of
// vectors.
for ( register unsigned int jdx = 0; jdx < nPoints; jdx++ )
{
ring->first[jdx] = *(( double * ) ptr );
ptr += sizeof( double );
ring->second[jdx] = *(( double * ) ptr );
ptr += sizeof( double );
if ( hasZValue )
ptr += sizeof( double );
}
// If ring has fewer than two points, what is it then?
// Anyway, this check prevents a crash
if ( nPoints < 1 )
{
QgsDebugMsg( "Ring has only " + QString::number( nPoints ) + " points! Skipping this ring." );
continue;
}
transformPoints( ring->first, ring->second, zVector, renderContext );
#if defined(Q_WS_X11)
// Work around a +/- 32768 limitation on coordinates in X11
// Look through the x and y coordinates and see if there are any
// that need trimming. If one is found, there's no need to look at
// the rest of them so end the loop at that point.
for ( register unsigned int i = 0; i < nPoints; ++i )
{
if ( std::abs( ring->first[i] ) > QgsClipper::MAX_X ||
std::abs( ring->second[i] ) > QgsClipper::MAX_Y )
{
QgsClipper::trimFeature( ring->first, ring->second, false );
break;
}
}
#endif
// Don't bother keeping the ring if it has been trimmed out of
// existence.
if ( ring->first.size() == 0 )
delete ring;
else
{
rings.push_back( ring );
total_points += ring->first.size();
}
}
// Now we draw the polygons
// use painter paths for drawing polygons with holes
// when adding polygon to the path they invert the area
// this means that adding inner rings to the path creates
// holes in outer ring
QPainterPath path; // OddEven fill rule by default
// Only try to draw polygons if there is something to draw
if ( total_points > 0 )
{
// Store size here and use it in the loop to avoid penalty of
// multiple calls to size()
int numRings = rings.size();
for ( register int i = 0; i < numRings; ++i )
{
// Store the pointer in a variable with a short name so as to make
// the following code easier to type and read.
ringTypePtr r = rings[i];
// only do this once to avoid penalty of additional calls
unsigned ringSize = r->first.size();
// Transfer points to the array of QPointF
QPolygonF pa( ringSize );
for ( register unsigned int j = 0; j != ringSize; ++j )
{
pa[j].setX( r->first[j] );
pa[j].setY( r->second[j] );
}
path.addPolygon( pa );
// Tidy up the pointed to pairs of vectors as we finish with them
delete rings[i];
}
#if 0
// A bit of code to aid in working out what values of
// QgsClipper::minX, etc cause the X11 zoom bug.
int largestX = -std::numeric_limits<int>::max();
int smallestX = std::numeric_limits<int>::max();
int largestY = -std::numeric_limits<int>::max();
int smallestY = std::numeric_limits<int>::max();
for ( int i = 0; i < pa.size(); ++i )
{
largestX = std::max( largestX, pa.point( i ).x() );
smallestX = std::min( smallestX, pa.point( i ).x() );
largestY = std::max( largestY, pa.point( i ).y() );
smallestY = std::min( smallestY, pa.point( i ).y() );
}
QgsDebugMsg( QString( "Largest X coordinate was %1" ).arg( largestX ) );
QgsDebugMsg( QString( "Smallest X coordinate was %1" ).arg( smallestX ) );
QgsDebugMsg( QString( "Largest Y coordinate was %1" ).arg( largestY ) );
QgsDebugMsg( QString( "Smallest Y coordinate was %1" ).arg( smallestY ) );
#endif
//preserve a copy of the brush and pen before we start fiddling with it
QBrush brush = p->brush(); //to be kept as original
QPen pen = p->pen(); // to be kept original
//
// experimental alpha transparency
// 255 = opaque
//
QBrush myTransparentBrush = p->brush();
QColor myColor = brush.color();
//only set transparency from layer level if renderer does not provide
//transparency on class level
if ( !mRenderer->usesTransparency() )
{
myColor.setAlpha( mTransparencyLevel );
}
myTransparentBrush.setColor( myColor );
QPen myTransparentPen = p->pen(); // store current pen
myColor = myTransparentPen.color();
//only set transparency from layer level if renderer does not provide
//transparency on class level
if ( !mRenderer->usesTransparency() )
{
myColor.setAlpha( mTransparencyLevel );
}
myTransparentPen.setColor( myColor );
p->setBrush( myTransparentBrush );
p->setPen( myTransparentPen );
//
// draw the polygon
//
p->drawPath( path );
// draw vertex markers if in editing mode, but only to the main canvas
if ( mEditable && renderContext.drawEditingInformation() )
{
for ( int i = 0; i < path.elementCount(); ++i )
{
const QPainterPath::Element & e = path.elementAt( i );
drawVertexMarker(( int )e.x, ( int )e.y, *p, mCurrentVertexMarkerType );
}
}
//
//restore brush and pen to original
//
p->setBrush( brush );
p->setPen( pen );
} // totalPoints > 0
return ptr;
}
bool QgsVectorLayer::draw( QgsRenderContext& rendererContext )
{
//set update threshold before each draw to make sure the current setting is picked up
QSettings settings;
mUpdateThreshold = settings.value( "Map/updateThreshold", 0 ).toInt();
//draw ( p, viewExtent, theMapToPixelTransform, ct, drawingToEditingCanvas, 1., 1.);
if ( mRenderer )
{
// painter is active (begin has been called
/* Steps to draw the layer
1. get the features in the view extent by SQL query
2. read WKB for a feature
3. transform
4. draw
*/
QPen pen;
/*Pointer to a marker image*/
QImage marker;
//vertex marker type for selection
QgsVectorLayer::VertexMarkerType vertexMarker = QgsVectorLayer::NoMarker;
if ( mEditable )
{
// Destroy all cached geometries and clear the references to them
deleteCachedGeometries();
mCachedGeometriesRect = rendererContext.extent();
vertexMarker = currentVertexMarkerType();
mVertexMarkerOnlyForSelection = settings.value( "/qgis/digitizing/marker_only_for_selected", false ).toBool();
}
updateFeatureCount();
int totalFeatures = pendingFeatureCount();
int featureCount = 0;
QgsFeature fet;
QgsAttributeList attributes = mRenderer->classificationAttributes();
select( attributes, rendererContext.extent() );
try
{
while ( nextFeature( fet ) )
{
if ( rendererContext.renderingStopped() )
{
break;
}
#ifndef Q_WS_MAC //MH: disable this on Mac for now to avoid problems with resizing
if ( mUpdateThreshold > 0 && 0 == featureCount % mUpdateThreshold )
{
emit screenUpdateRequested();
emit drawingProgress( featureCount, totalFeatures );
qApp->processEvents();
}
else if ( featureCount % 1000 == 0 )
{
emit drawingProgress( featureCount, totalFeatures );
qApp->processEvents();
}
#else
Q_UNUSED( totalFeatures );
#endif //Q_WS_MAC
// check if feature is selected
// only show selections of the current layer
// TODO: create a mechanism to let layer know whether it's current layer or not [MD]
bool sel = mSelectedFeatureIds.contains( fet.id() );
mCurrentVertexMarkerType = QgsVectorLayer::NoMarker;
if ( mEditable )
{
// Cache this for the use of (e.g.) modifying the feature's uncommitted geometry.
mCachedGeometries[fet.id()] = *fet.geometry();
if ( !mVertexMarkerOnlyForSelection || sel )
{
mCurrentVertexMarkerType = vertexMarker;
}
}
//QgsDebugMsg(QString("markerScale before renderFeature(): %1").arg(markerScaleFactor));
// markerScalerFactore reflects the wanted scaling of the marker
double opacity = 1.0;
if ( !mRenderer->usesTransparency() )
{
opacity = ( mTransparencyLevel * 1.0 ) / 255.0;
}
mRenderer->renderFeature( rendererContext, fet, &marker, sel, opacity );
// markerScalerFactore now reflects the actual scaling of the marker that the render performed.
//QgsDebugMsg(QString("markerScale after renderFeature(): %1").arg(markerScaleFactor));
//double scale = rendererContext.scaleFactor() / markerScaleFactor;
drawFeature( rendererContext, fet, &marker );
++featureCount;
}
}
catch ( QgsCsException &cse )
{
QString msg( "Failed to transform a point while drawing a feature of type '"
+ fet.typeName() + "'. Ignoring this feature." );
msg += cse.what();
QgsLogger::warning( msg );
}
}
else
{
QgsLogger::warning( "QgsRenderer is null in QgsVectorLayer::draw()" );
}
if ( mEditable )
{
QgsDebugMsg( QString( "Cached %1 geometries." ).arg( mCachedGeometries.count() ) );
}
return TRUE; // Assume success always
}
void QgsVectorLayer::deleteCachedGeometries()
{
// Destroy any cached geometries
mCachedGeometries.clear();
mCachedGeometriesRect = QgsRectangle();
}
void QgsVectorLayer::drawVertexMarker( int x, int y, QPainter& p, QgsVectorLayer::VertexMarkerType type )
{
if ( type == QgsVectorLayer::SemiTransparentCircle )
{
p.setPen( QColor( 50, 100, 120, 200 ) );
p.setBrush( QColor( 200, 200, 210, 120 ) );
p.drawEllipse( QRectF( x - 7, y - 7, 14, 14 ) );
}
else if ( type == QgsVectorLayer::Cross )
{
int size = 15;
int m = ( size - 1 ) / 2;
p.setPen( QColor( 255, 0, 0 ) );
p.drawLine( x - m, y + m, x + m, y - m );
p.drawLine( x - m, y - m, x + m, y + m );
}
}
void QgsVectorLayer::select( int number, bool emitSignal )
{
mSelectedFeatureIds.insert( number );
if ( emitSignal )
{
emit selectionChanged();
}
}
void QgsVectorLayer::deselect( int number, bool emitSignal )
{
mSelectedFeatureIds.remove( number );
if ( emitSignal )
{
emit selectionChanged();
}
}
void QgsVectorLayer::select( QgsRectangle & rect, bool lock )
{
// normalize the rectangle
rect.normalize();
if ( lock == false )
{
removeSelection( FALSE ); // don't emit signal
}
//select all the elements
select( QgsAttributeList(), rect, false, true );
QgsFeature f;
while ( nextFeature( f ) )
{
select( f.id(), false ); // don't emit signal (not to redraw it everytime)
}
emit selectionChanged(); // now emit signal to redraw layer
}
void QgsVectorLayer::invertSelection()
{
// copy the ids of selected features to tmp
QgsFeatureIds tmp = mSelectedFeatureIds;
removeSelection( FALSE ); // don't emit signal
select( QgsAttributeList(), QgsRectangle(), false );
QgsFeature fet;
while ( nextFeature( fet ) )
{
select( fet.id(), false ); // don't emit signal
}
for ( QgsFeatureIds::iterator iter = tmp.begin(); iter != tmp.end(); ++iter )
{
mSelectedFeatureIds.remove( *iter );
}
emit selectionChanged();
}
void QgsVectorLayer::invertSelectionInRectangle( QgsRectangle & rect )
{
// normalize the rectangle
rect.normalize();
select( QgsAttributeList(), rect, false, true );
QgsFeature fet;
while ( nextFeature( fet ) )
{
if ( mSelectedFeatureIds.contains( fet.id() ) )
{
deselect( fet.id(), false ); // don't emit signal
}
else
{
select( fet.id(), false ); // don't emit signal
}
}
emit selectionChanged();
}
void QgsVectorLayer::removeSelection( bool emitSignal )
{
mSelectedFeatureIds.clear();
if ( emitSignal )
emit selectionChanged();
}
void QgsVectorLayer::triggerRepaint()
{
emit repaintRequested();
}
QgsVectorDataProvider* QgsVectorLayer::dataProvider()
{
return mDataProvider;
}
const QgsVectorDataProvider* QgsVectorLayer::dataProvider() const
{
return mDataProvider;
}
void QgsVectorLayer::setProviderEncoding( const QString& encoding )
{
if ( mDataProvider )
{
mDataProvider->setEncoding( encoding );
}
}
const QgsRenderer* QgsVectorLayer::renderer() const
{
return mRenderer;
}
void QgsVectorLayer::setRenderer( QgsRenderer * r )
{
if ( r != mRenderer )
{
delete mRenderer;
mRenderer = r;
}
}
QGis::GeometryType QgsVectorLayer::geometryType() const
{
if ( mDataProvider )
{
int type = mDataProvider->geometryType();
switch ( type )
{
case QGis::WKBPoint:
case QGis::WKBPoint25D:
return QGis::Point;
case QGis::WKBLineString:
case QGis::WKBLineString25D:
return QGis::Line;
case QGis::WKBPolygon:
case QGis::WKBPolygon25D:
return QGis::Polygon;
case QGis::WKBMultiPoint:
case QGis::WKBMultiPoint25D:
return QGis::Point;
case QGis::WKBMultiLineString:
case QGis::WKBMultiLineString25D:
return QGis::Line;
case QGis::WKBMultiPolygon:
case QGis::WKBMultiPolygon25D:
return QGis::Polygon;
}
QgsDebugMsg( QString( "Data Provider Geometry type is not recognised, is %1" ).arg( type ) );
}
else
{
QgsDebugMsg( "pointer to mDataProvider is null" );
}
// We shouldn't get here, and if we have, other things are likely to
// go wrong. Code that uses the type() return value should be
// rewritten to cope with a value of QGis::Unknown. To make this
// need known, the following message is printed every time we get
// here.
QgsDebugMsg( "WARNING: This code should never be reached. Problems may occur..." );
return QGis::UnknownGeometry;
}
QGis::WkbType QgsVectorLayer::wkbType() const
{
return ( QGis::WkbType )( mWkbType );
}
QgsRectangle QgsVectorLayer::boundingBoxOfSelected()
{
if ( mSelectedFeatureIds.size() == 0 )//no selected features
{
return QgsRectangle( 0, 0, 0, 0 );
}