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pallabeling.cpp
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pallabeling.cpp
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#include "pallabeling.h"
#include <iostream>
#include <list>
#include <pal/pal.h>
#include <pal/feature.h>
#include <pal/layer.h>
#include <pal/palgeometry.h>
#include <pal/palexception.h>
#include <pal/problem.h>
#include <pal/labelposition.h>
#include <geos_c.h>
#include <cmath>
#include <QByteArray>
#include <QString>
#include <QFontMetrics>
#include <QTime>
#include <QPainter>
#include <qgslogger.h>
#include <qgsvectorlayer.h>
#include <qgsmaplayerregistry.h>
#include <qgsvectordataprovider.h>
#include <qgsgeometry.h>
#include <qgsmaprenderer.h>
using namespace pal;
class MyLabel : public PalGeometry
{
public:
MyLabel( int id, QString text, GEOSGeometry* g ): mG( g ), mText( text ), mId( id ), mInfo( NULL )
{
mStrId = QByteArray::number( id );
}
~MyLabel()
{
if ( mG ) GEOSGeom_destroy( mG );
delete mInfo;
}
// getGeosGeometry + releaseGeosGeometry is called twice: once when adding, second time when labeling
GEOSGeometry* getGeosGeometry()
{
return mG;
}
void releaseGeosGeometry( GEOSGeometry* /*geom*/ )
{
// nothing here - we'll delete the geometry in destructor
}
const char* strId() { return mStrId.data(); }
QString text() { return mText; }
pal::LabelInfo* info( QFontMetrics* fm, const QgsMapToPixel* xform )
{
if ( mInfo ) return mInfo;
// create label info!
QgsPoint ptZero = xform->toMapCoordinates( 0, 0 );
QgsPoint ptSize = xform->toMapCoordinates( 0, -fm->height() );
mInfo = new pal::LabelInfo( mText.count(), ptSize.y() - ptZero.y() );
for ( int i = 0; i < mText.count(); i++ )
{
mInfo->char_info[i].chr = mText[i].unicode();
ptSize = xform->toMapCoordinates( fm->width( mText[i] ), 0 );
mInfo->char_info[i].width = ptSize.x() - ptZero.x();
}
return mInfo;
}
protected:
GEOSGeometry* mG;
QString mText;
QByteArray mStrId;
int mId;
LabelInfo* mInfo;
};
// -------------
LayerSettings::LayerSettings()
: palLayer( NULL ), fontMetrics( NULL ), ct( NULL )
{
placement = AroundPoint;
placementFlags = 0;
//textFont = QFont();
textColor = Qt::black;
enabled = false;
priority = 5;
obstacle = true;
dist = 0;
scaleMin = 0;
scaleMax = 0;
bufferSize = 1;
bufferColor = Qt::white;
labelPerPart = false;
mergeLines = false;
}
LayerSettings::LayerSettings( const LayerSettings& s )
{
// copy only permanent stuff
fieldName = s.fieldName;
placement = s.placement;
placementFlags = s.placementFlags;
textFont = s.textFont;
textColor = s.textColor;
enabled = s.enabled;
priority = s.priority;
obstacle = s.obstacle;
dist = s.dist;
scaleMin = s.scaleMin;
scaleMax = s.scaleMax;
bufferSize = s.bufferSize;
bufferColor = s.bufferColor;
labelPerPart = s.labelPerPart;
mergeLines = s.mergeLines;
fontMetrics = NULL;
ct = NULL;
}
LayerSettings::~LayerSettings()
{
// pal layer is deleted internally in PAL
delete fontMetrics;
delete ct;
}
static QColor _readColor( QgsVectorLayer* layer, QString property )
{
int r = layer->customProperty( property + "R" ).toInt();
int g = layer->customProperty( property + "G" ).toInt();
int b = layer->customProperty( property + "B" ).toInt();
return QColor( r, g, b );
}
static void _writeColor( QgsVectorLayer* layer, QString property, QColor color )
{
layer->setCustomProperty( property + "R", color.red() );
layer->setCustomProperty( property + "G", color.green() );
layer->setCustomProperty( property + "B", color.blue() );
}
void LayerSettings::readFromLayer( QgsVectorLayer* layer )
{
if ( layer->customProperty( "labeling" ).toString() != QString( "pal" ) )
return; // there's no information available
fieldName = layer->customProperty( "labeling/fieldName" ).toString();
placement = ( Placement ) layer->customProperty( "labeling/placement" ).toInt();
placementFlags = layer->customProperty( "labeling/placementFlags" ).toUInt();
QString fontFamily = layer->customProperty( "labeling/fontFamily" ).toString();
int fontSize = layer->customProperty( "labeling/fontSize" ).toInt();
int fontWeight = layer->customProperty( "labeling/fontWeight" ).toInt();
bool fontItalic = layer->customProperty( "labeling/fontItalic" ).toBool();
textFont = QFont( fontFamily, fontSize, fontWeight, fontItalic );
textColor = _readColor( layer, "labeling/textColor" );
enabled = layer->customProperty( "labeling/enabled" ).toBool();
priority = layer->customProperty( "labeling/priority" ).toInt();
obstacle = layer->customProperty( "labeling/obstacle" ).toBool();
dist = layer->customProperty( "labeling/dist" ).toDouble();
scaleMin = layer->customProperty( "labeling/scaleMin" ).toInt();
scaleMax = layer->customProperty( "labeling/scaleMax" ).toInt();
bufferSize = layer->customProperty( "labeling/bufferSize" ).toInt();
bufferColor = _readColor( layer, "labeling/bufferColor" );
labelPerPart = layer->customProperty( "labeling/labelPerPart" ).toBool();
mergeLines = layer->customProperty( "labeling/mergeLines" ).toBool();
}
void LayerSettings::writeToLayer( QgsVectorLayer* layer )
{
// this is a mark that labeling information is present
layer->setCustomProperty( "labeling", "pal" );
layer->setCustomProperty( "labeling/fieldName", fieldName );
layer->setCustomProperty( "labeling/placement", placement );
layer->setCustomProperty( "labeling/placementFlags", ( unsigned int )placementFlags );
layer->setCustomProperty( "labeling/fontFamily", textFont.family() );
layer->setCustomProperty( "labeling/fontSize", textFont.pointSize() );
layer->setCustomProperty( "labeling/fontWeight", textFont.weight() );
layer->setCustomProperty( "labeling/fontItalic", textFont.italic() );
_writeColor( layer, "labeling/textColor", textColor );
layer->setCustomProperty( "labeling/enabled", enabled );
layer->setCustomProperty( "labeling/priority", priority );
layer->setCustomProperty( "labeling/obstacle", obstacle );
layer->setCustomProperty( "labeling/dist", dist );
layer->setCustomProperty( "labeling/scaleMin", scaleMin );
layer->setCustomProperty( "labeling/scaleMax", scaleMax );
layer->setCustomProperty( "labeling/bufferSize", bufferSize );
_writeColor( layer, "labeling/bufferColor", bufferColor );
layer->setCustomProperty( "labeling/labelPerPart", labelPerPart );
layer->setCustomProperty( "labeling/mergeLines", mergeLines );
}
void LayerSettings::calculateLabelSize( QString text, double& labelX, double& labelY )
{
//QFontMetrics fontMetrics(textFont);
QRect labelRect = /*QRect(0,0,20,20);*/ fontMetrics->boundingRect( text );
// 2px border...
QgsPoint ptSize = xform->toMapCoordinates( labelRect.width() + 2, labelRect.height() + 2 );
labelX = fabs( ptSize.x() - ptZero.x() );
labelY = fabs( ptSize.y() - ptZero.y() );
}
void LayerSettings::registerFeature( QgsFeature& f )
{
QString labelText = f.attributeMap()[fieldIndex].toString();
double labelX, labelY; // will receive label size
calculateLabelSize( labelText, labelX, labelY );
QgsGeometry* geom = f.geometry();
if ( ct != NULL ) // reproject the geometry if necessary
geom->transform( *ct );
MyLabel* lbl = new MyLabel( f.id(), labelText, GEOSGeom_clone( geom->asGeos() ) );
// record the created geometry - it will be deleted at the end.
geometries.append( lbl );
// register feature to the layer
try
{
if ( !palLayer->registerFeature( lbl->strId(), lbl, labelX, labelY, labelText.toUtf8().constData() ) )
return;
}
catch ( std::exception* e )
{
QgsDebugMsg( QString( "Ignoring feature %1 due PAL exception: " ).arg( f.id() ) + QString::fromLatin1( e->what() ) );
return;
}
// TODO: only for placement which needs character info
pal::Feature* feat = palLayer->getFeature( lbl->strId() );
feat->setLabelInfo( lbl->info( fontMetrics, xform ) );
// TODO: allow layer-wide feature dist in PAL...?
if ( dist != 0 )
feat->setDistLabel( fabs( ptOne.x() - ptZero.x() )* dist );
}
// -------------
PalLabeling::PalLabeling()
: mMapRenderer( NULL ), mPal( NULL )
{
// find out engine defaults
Pal p;
mCandPoint = p.getPointP();
mCandLine = p.getLineP();
mCandPolygon = p.getPolyP();
switch ( p.getSearch() )
{
case CHAIN: mSearch = Chain; break;
case POPMUSIC_TABU: mSearch = Popmusic_Tabu; break;
case POPMUSIC_CHAIN: mSearch = Popmusic_Chain; break;
case POPMUSIC_TABU_CHAIN: mSearch = Popmusic_Tabu_Chain; break;
case FALP: mSearch = Falp; break;
}
mShowingCandidates = FALSE;
mShowingAllLabels = FALSE;
}
PalLabeling::~PalLabeling()
{
// make sure we've freed everything
exit();
}
bool PalLabeling::willUseLayer( QgsVectorLayer* layer )
{
LayerSettings lyrTmp;
lyrTmp.readFromLayer( layer );
return lyrTmp.enabled;
}
int PalLabeling::prepareLayer( QgsVectorLayer* layer, int& attrIndex, QgsRenderContext& ctx )
{
Q_ASSERT( mMapRenderer != NULL );
// start with a temporary settings class, find out labeling info
LayerSettings lyrTmp;
lyrTmp.readFromLayer( layer );
if ( !lyrTmp.enabled )
return 0;
// find out which field will be needed
int fldIndex = layer->fieldNameIndex( lyrTmp.fieldName );
if ( fldIndex == -1 )
return 0;
attrIndex = fldIndex;
// add layer settings to the pallabeling hashtable: <QgsVectorLayer*, LayerSettings>
mActiveLayers.insert( layer, lyrTmp );
// start using the reference to the layer in hashtable instead of local instance
LayerSettings& lyr = mActiveLayers[layer];
// how to place the labels
Arrangement arrangement;
switch ( lyr.placement )
{
case LayerSettings::AroundPoint: arrangement = P_POINT; break;
case LayerSettings::OverPoint: arrangement = P_POINT_OVER; break;
case LayerSettings::Line: arrangement = P_LINE; break;
case LayerSettings::Curved: arrangement = P_CURVED; break;
case LayerSettings::Horizontal: arrangement = P_HORIZ; break;
case LayerSettings::Free: arrangement = P_FREE; break;
default: Q_ASSERT( "unsupported placement" && 0 ); return 0; break;
}
// create the pal layer
double priority = 1 - lyr.priority / 10.0; // convert 0..10 --> 1..0
double min_scale = -1, max_scale = -1;
if ( lyr.scaleMin != 0 && lyr.scaleMax != 0 )
{
min_scale = lyr.scaleMin;
max_scale = lyr.scaleMax;
}
Layer* l = mPal->addLayer( layer->getLayerID().toLocal8Bit().data(),
min_scale, max_scale, arrangement,
METER, priority, lyr.obstacle, true, true );
if ( lyr.placementFlags )
l->setArrangementFlags( lyr.placementFlags );
// set label mode (label per feature is the default)
l->setLabelMode( lyr.labelPerPart ? Layer::LabelPerFeaturePart : Layer::LabelPerFeature );
// set whether adjacent lines should be merged
l->setMergeConnectedLines( lyr.mergeLines );
// set font size from points to output size
double size = 0.3527 * lyr.textFont.pointSizeF() * ctx.scaleFactor(); //* ctx.rasterScaleFactor();
lyr.textFont.setPixelSize((int)size);
// save the pal layer to our layer context (with some additional info)
lyr.palLayer = l;
lyr.fieldIndex = fldIndex;
lyr.fontMetrics = new QFontMetrics( lyr.textFont );
lyr.fontBaseline = lyr.fontMetrics->boundingRect( "X" ).bottom(); // dummy text to find out how many pixels of the text are below the baseline
lyr.xform = mMapRenderer->coordinateTransform();
if ( mMapRenderer->hasCrsTransformEnabled() )
lyr.ct = new QgsCoordinateTransform( layer->srs(), mMapRenderer->destinationSrs() );
else
lyr.ct = NULL;
lyr.ptZero = lyr.xform->toMapCoordinates( 0, 0 );
lyr.ptOne = lyr.xform->toMapCoordinates( 1, 0 );
return 1; // init successful
}
void PalLabeling::registerFeature( QgsVectorLayer* layer, QgsFeature& f )
{
mActiveLayers[layer].registerFeature( f );
}
void PalLabeling::init( QgsMapRenderer* mr )
{
mMapRenderer = mr;
// delete if exists already
if ( mPal )
delete mPal;
mPal = new Pal;
SearchMethod s;
switch ( mSearch )
{
default:
case Chain: s = CHAIN; break;
case Popmusic_Tabu: s = POPMUSIC_TABU; break;
case Popmusic_Chain: s = POPMUSIC_CHAIN; break;
case Popmusic_Tabu_Chain: s = POPMUSIC_TABU_CHAIN; break;
case Falp: s = FALP; break;
}
mPal->setSearch( s );
// set number of candidates generated per feature
mPal->setPointP( mCandPoint );
mPal->setLineP( mCandLine );
mPal->setPolyP( mCandPolygon );
}
void PalLabeling::exit()
{
delete mPal;
mPal = NULL;
mMapRenderer = NULL;
}
LayerSettings& PalLabeling::layer( const char* layerName )
{
QHash<QgsVectorLayer*, LayerSettings>::iterator lit;
for ( lit = mActiveLayers.begin(); lit != mActiveLayers.end(); ++lit )
{
LayerSettings& lyr = lit.value();
if ( lyr.palLayer->getName() == layerName )
return lyr;
}
return mInvalidLayerSettings;
}
void PalLabeling::drawLabeling( QgsRenderContext& context )
{
Q_ASSERT( mMapRenderer != NULL );
QPainter* painter = context.painter();
QgsRectangle extent = context.extent();
QTime t;
t.start();
// do the labeling itself
double scale = mMapRenderer->scale(); // scale denominator
QgsRectangle r = extent;
double bbox[] = { r.xMinimum(), r.yMinimum(), r.xMaximum(), r.yMaximum() };
std::list<LabelPosition*>* labels;
pal::Problem* problem;
try
{
problem = mPal->extractProblem( scale, bbox );
}
catch ( std::exception& e )
{
QgsDebugMsg( "PAL EXCEPTION :-( " + QString::fromLatin1( e.what() ) );
mActiveLayers.clear(); // clean up
return;
}
const QgsMapToPixel* xform = mMapRenderer->coordinateTransform();
// draw rectangles with all candidates
// this is done before actual solution of the problem
// before number of candidates gets reduced
mCandidates.clear();
if ( mShowingCandidates && problem )
{
painter->setPen( QColor( 0, 0, 0, 64 ) );
painter->setBrush( Qt::NoBrush );
for ( int i = 0; i < problem->getNumFeatures(); i++ )
{
for ( int j = 0; j < problem->getFeatureCandidateCount( i ); j++ )
{
pal::LabelPosition* lp = problem->getFeatureCandidate( i, j );
drawLabelCandidateRect( lp, painter, xform );
}
}
}
// find the solution
labels = mPal->solveProblem( problem, mShowingAllLabels );
QgsDebugMsg( QString( "LABELING work: %1 ms ... labels# %2" ).arg( t.elapsed() ).arg( labels->size() ) );
t.restart();
painter->setRenderHint( QPainter::Antialiasing );
// draw the labels
std::list<LabelPosition*>::iterator it = labels->begin();
for ( ; it != labels->end(); ++it )
{
const LayerSettings& lyr = layer(( *it )->getLayerName() );
if ( lyr.bufferSize != 0 )
drawLabel( *it, painter, xform, true );
drawLabel( *it, painter, xform );
}
QgsDebugMsg( QString( "LABELING draw: %1 ms" ).arg( t.elapsed() ) );
delete problem;
delete labels;
// delete all allocated geometries for features
QHash<QgsVectorLayer*, LayerSettings>::iterator lit;
for ( lit = mActiveLayers.begin(); lit != mActiveLayers.end(); ++lit )
{
LayerSettings& lyr = lit.value();
for ( QList<MyLabel*>::iterator git = lyr.geometries.begin(); git != lyr.geometries.end(); ++git )
delete *git;
lyr.geometries.clear();
}
// labeling is done: clear the active layers hashtable
mActiveLayers.clear();
}
void PalLabeling::numCandidatePositions( int& candPoint, int& candLine, int& candPolygon )
{
candPoint = mCandPoint;
candLine = mCandLine;
candPolygon = mCandPolygon;
}
void PalLabeling::setNumCandidatePositions( int candPoint, int candLine, int candPolygon )
{
mCandPoint = candPoint;
mCandLine = candLine;
mCandPolygon = candPolygon;
}
void PalLabeling::setSearchMethod( PalLabeling::Search s )
{
mSearch = s;
}
PalLabeling::Search PalLabeling::searchMethod() const
{
return mSearch;
}
void PalLabeling::drawLabelCandidateRect( pal::LabelPosition* lp, QPainter* painter, const QgsMapToPixel* xform )
{
QgsPoint outPt = xform->transform( lp->getX(), lp->getY() );
QgsPoint outPt2 = xform->transform( lp->getX() + lp->getWidth(), lp->getY() + lp->getHeight() );
painter->save();
painter->translate( QPointF( outPt.x(), outPt.y() ) );
painter->rotate( -lp->getAlpha() * 180 / M_PI );
QRectF rect( 0, 0, outPt2.x() - outPt.x(), outPt2.y() - outPt.y() );
painter->drawRect( rect );
painter->restore();
// save the rect
rect.moveTo( outPt.x(), outPt.y() );
mCandidates.append( LabelCandidate( rect, lp->getCost() * 1000 ) );
// show all parts of the multipart label
if ( lp->getNextPart() )
drawLabelCandidateRect( lp->getNextPart(), painter, xform );
}
#include "qgslogger.h"
void PalLabeling::drawLabel( pal::LabelPosition* label, QPainter* painter, const QgsMapToPixel* xform, bool drawBuffer )
{
QgsPoint outPt = xform->transform( label->getX(), label->getY() );
// TODO: optimize access :)
const LayerSettings& lyr = layer( label->getLayerName() );
QString text = (( MyLabel* )label->getFeaturePart()->getUserGeometry() )->text();
QString txt = ( label->getPartId() == -1 ? text : QString( text[label->getPartId()] ) );
//QgsDebugMsg( "drawLabel " + QString::number( drawBuffer ) + " " + txt );
// shift by one as we have 2px border
painter->save();
painter->translate( QPointF( outPt.x(), outPt.y() ) );
painter->rotate( -label->getAlpha() * 180 / M_PI );
painter->translate( QPointF( 1, -1 - lyr.fontBaseline ) );
if ( drawBuffer )
{
// we're drawing buffer
drawLabelBuffer( painter, txt, lyr.textFont, lyr.bufferSize, lyr.bufferColor );
}
else
{
// we're drawing real label
/*painter->setFont( lyr.textFont );
painter->setPen( lyr.textColor );
painter->drawText((0,0, txt);*/
QPainterPath path;
path.addText( 0, 0, lyr.textFont, txt );
painter->setPen( Qt::NoPen );
painter->setBrush( lyr.textColor );
painter->drawPath( path );
}
painter->restore();
if ( label->getNextPart() )
drawLabel( label->getNextPart(), painter, xform, drawBuffer );
}
void PalLabeling::drawLabelBuffer( QPainter* p, QString text, const QFont& font, int size, QColor color )
{
/*
p->setFont( font );
p->setPen( color );
for (int x = -size; x <= size; x++)
for (int y = -size; y <= size; y++)
p->drawText(x,y, text);
*/
QPainterPath path;
path.addText( 0, 0, font, text );
p->setPen( QPen( color, size ) );
p->setBrush( color );
p->drawPath( path );
}
QgsLabelingEngineInterface* PalLabeling::clone()
{
PalLabeling* lbl = new PalLabeling();
lbl->mShowingAllLabels = mShowingAllLabels;
lbl->mShowingCandidates = mShowingCandidates;
return lbl;
}