//
// This file is part of the Marble Virtual Globe.
//
// This program is free software licensed under the GNU LGPL. You can
// find a copy of this license in LICENSE.txt in the top directory of
// the source code.
//
// Copyright 2006-2009 Torsten Rahn <tackat@kde.org>


#include "GeoPainter.h"
#include "GeoPainter_p.h"

#include <QtCore/QList>
#include <QtGui/QPainterPath>
#include <QtGui/QRegion>

#include "AbstractProjection.h"
#include "MarbleDebug.h"

#include "GeoDataCoordinates.h"
#include "GeoDataLineString.h"
#include "GeoDataLinearRing.h"
#include "GeoDataPoint.h"
#include "GeoDataPolygon.h"

#include "global.h"
#include "ViewportParams.h"

// #define MARBLE_DEBUG

using namespace Marble;

GeoPainterPrivate::GeoPainterPrivate( ViewportParams *viewport, MapQuality mapQuality )
        : m_viewport( viewport ),
        m_mapQuality( mapQuality ),
        m_x( new qreal[100] )
{
}

GeoPainterPrivate::~GeoPainterPrivate()
{
    delete[] m_x;
}

void GeoPainterPrivate::createPolygonsFromLineString( const GeoDataLineString & lineString,
                                                      QVector<QPolygonF *> &polygons )
{
    AbstractProjection *projection = m_viewport->currentProjection();

    projection->screenCoordinates( lineString, m_viewport, polygons );
}

void GeoPainterPrivate::createPolygonsFromLinearRing( const GeoDataLinearRing & linearRing,
                                                      QVector<QPolygonF *> &polygons )
{
    AbstractProjection *projection = m_viewport->currentProjection();

    projection->screenCoordinates( linearRing, m_viewport, polygons );
}

void GeoPainterPrivate::createAnnotationLayout (  qreal x, qreal y,
                                                  QSizeF bubbleSize,
                                                  qreal bubbleOffsetX, qreal bubbleOffsetY,
                                                  qreal xRnd, qreal yRnd,
                                                  QPainterPath& path, QRectF& rect )
{
    // TODO: MOVE this into an own Annotation class
    qreal arrowPosition = 0.3;
    qreal arrowWidth = 12.0;

    qreal width =  bubbleSize.width();
    qreal height = bubbleSize.height();

    qreal dx =  ( bubbleOffsetX > 0 ) ? 1.0 : -1.0; // x-Mirror
    qreal dy =  ( bubbleOffsetY < 0 ) ? 1.0 : -1.0; // y-Mirror

    qreal x0 =  ( x + bubbleOffsetX ) - dx * ( 1.0 - arrowPosition ) * ( width - 2.0 * xRnd ) - xRnd *dx;
    qreal x1 =  ( x + bubbleOffsetX ) - dx * ( 1.0 - arrowPosition ) * ( width - 2.0 * xRnd );
    qreal x2 =  ( x + bubbleOffsetX ) - dx * ( 1.0 - arrowPosition ) * ( width - 2.0 * xRnd ) + xRnd * dx;
    qreal x3 =  ( x + bubbleOffsetX ) - dx * arrowWidth / 2.0;
    qreal x4 =  ( x + bubbleOffsetX ) + dx * arrowWidth / 2.0;
    qreal x5 =  ( x + bubbleOffsetX ) + dx * arrowPosition * ( width - 2.0 * xRnd )- xRnd * dx;
    qreal x6 =  ( x + bubbleOffsetX ) + dx * arrowPosition * ( width - 2.0 * xRnd );
    qreal x7 =  ( x + bubbleOffsetX ) + dx * arrowPosition * ( width - 2.0 * xRnd ) + xRnd * dx;

    qreal y0 =  ( y + bubbleOffsetY );
    qreal y1 =  ( y + bubbleOffsetY ) - dy * yRnd;
    qreal y2 =  ( y + bubbleOffsetY ) - dy * 2 * yRnd;
    qreal y5 =  ( y + bubbleOffsetY ) - dy * ( height - 2 * yRnd );
    qreal y6 =  ( y + bubbleOffsetY ) - dy * ( height - yRnd );
    qreal y7 =  ( y + bubbleOffsetY ) - dy * height;

    QPointF p1 ( x, y ); // pointing point
    QPointF p2 ( x4, y0 );
    QPointF p3 ( x6, y0 );
    QPointF p4 ( x7, y1 );
    QPointF p5 ( x7, y6 );
    QPointF p6 ( x6, y7 );
    QPointF p7 ( x1, y7 );
    QPointF p8 ( x0, y6 );
    QPointF p9 ( x0, y1 );
    QPointF p10( x1, y0 );
    QPointF p11( x3, y0 );

    QRectF bubbleBoundingBox(  QPointF( x0, y7 ), QPointF( x7, y0 ) );

    path.moveTo( p1 );
    path.lineTo( p2 );

    path.lineTo( p3 );
    QRectF bottomRight( QPointF( x5, y2 ), QPointF( x7, y0 ) );
    path.arcTo( bottomRight, 270.0, 90.0 );

    path.lineTo( p5 );
    QRectF topRight( QPointF( x5, y7 ), QPointF( x7, y5 ) );
    path.arcTo( topRight, 0.0, 90.0 );

    path.lineTo( p7 );
    QRectF topLeft( QPointF( x0, y7 ), QPointF( x2, y5 ) );
    path.arcTo( topLeft, 90.0, 90.0 );

    path.lineTo( p9 );
    QRectF bottomLeft( QPointF( x0, y2 ), QPointF( x2, y0 ) );
    path.arcTo( bottomLeft, 180.0, 90.0 );

    path.lineTo( p10 );
    path.lineTo( p11 );
    path.lineTo( p1 );

    qreal left   = ( dx > 0 ) ? x1 : x6;
    qreal right  = ( dx > 0 ) ? x6 : x1;
    qreal top    = ( dy > 0 ) ? y6 : y1;
    qreal bottom = ( dy > 0 ) ? y1 : y6;

    rect.setTopLeft( QPointF( left, top ) );
    rect.setBottomRight( QPointF( right, bottom ) );
}

GeoDataLinearRing GeoPainterPrivate::createLinearRingFromGeoRect( const GeoDataCoordinates & centerCoordinates,
                                                                  qreal width, qreal height )
{
    qreal lon = 0.0;
    qreal lat = 0.0;
    qreal altitude = centerCoordinates.altitude();
    centerCoordinates.geoCoordinates( lon, lat, GeoDataCoordinates::Degree );

    lon = GeoDataCoordinates::normalizeLon( lon, GeoDataCoordinates::Degree );
    lat = GeoDataCoordinates::normalizeLat( lat, GeoDataCoordinates::Degree );

    qreal west = GeoDataCoordinates::normalizeLon( lon - width * 0.5, GeoDataCoordinates::Degree );
    qreal east =  GeoDataCoordinates::normalizeLon( lon + width * 0.5, GeoDataCoordinates::Degree );

    qreal north = GeoDataCoordinates::normalizeLat( lat + height * 0.5, GeoDataCoordinates::Degree );
    qreal south = GeoDataCoordinates::normalizeLat( lat - height * 0.5, GeoDataCoordinates::Degree );

    GeoDataCoordinates southWest( west, south,
                                  altitude, GeoDataCoordinates::Degree );
    GeoDataCoordinates southEast( east, south,
                                  altitude, GeoDataCoordinates::Degree );
    GeoDataCoordinates northEast( east, north,
                                  altitude, GeoDataCoordinates::Degree );
    GeoDataCoordinates northWest( west, north,
                                  altitude, GeoDataCoordinates::Degree );

    GeoDataLinearRing rectangle( Tessellate | RespectLatitudeCircle );

    // If the width of the rect is larger as 180 degree, we have to enforce the long way.
    if ( width >= 180 ) {
        qreal center = lon;
        GeoDataCoordinates southCenter( center, south, altitude, GeoDataCoordinates::Degree );
        GeoDataCoordinates northCenter( center, north, altitude, GeoDataCoordinates::Degree );

        rectangle << southWest << southCenter << southEast << northEast << northCenter << northWest;
    }
    else {
        rectangle << southWest << southEast << northEast << northWest;
    }

    return rectangle;
}

// -------------------------------------------------------------------------------------------------

GeoPainter::GeoPainter( QPaintDevice* pd, ViewportParams *viewport,
			MapQuality mapQuality, bool clip )
    : ClipPainter( pd, clip ),
      d( new GeoPainterPrivate( viewport, mapQuality ) )
{
}


GeoPainter::~GeoPainter()
{
    delete d;
}


void GeoPainter::autoMapQuality()
{
    const bool antialiased = d->m_mapQuality == HighQuality || d->m_mapQuality == PrintQuality;
    setRenderHint( QPainter::Antialiasing, antialiased );
}


MapQuality GeoPainter::mapQuality() const
{
    return d->m_mapQuality;
}


void GeoPainter::drawAnnotation( const GeoDataCoordinates & position,
                                 const QString & text, QSizeF bubbleSize,
                                 qreal bubbleOffsetX, qreal bubbleOffsetY,
                                 qreal xRnd, qreal yRnd )
{
    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

    bool visible = projection->screenCoordinates( position, d->m_viewport, d->m_x, y, pointRepeatNum, globeHidesPoint );

    if ( visible ) {
        // Draw all the x-repeat-instances of the point on the screen
        for( int it = 0; it < pointRepeatNum; ++it ) {
            QPainterPath path;
            QRectF rect;
            d->createAnnotationLayout( d->m_x[it], y, bubbleSize, bubbleOffsetX, bubbleOffsetY,  xRnd, yRnd, path, rect );
            QPainter::drawPath( path );
            QPainter::drawText( rect, Qt::TextWordWrap, text, &rect );
        }
    }
}


void GeoPainter::drawPoint (  const GeoDataCoordinates & position )
{
    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

    bool visible = projection->screenCoordinates( position, d->m_viewport, d->m_x, y, pointRepeatNum, globeHidesPoint );

    if ( visible ) {
        // Draw all the x-repeat-instances of the point on the screen
        for( int it = 0; it < pointRepeatNum; ++it ) {
            QPainter::drawPoint( d->m_x[it], y );
        }
    }
}


QRegion GeoPainter::regionFromPoint ( const GeoDataCoordinates & position,
                                      qreal width )
{
    return regionFromRect( position, width, width, false, 3 );
}


void GeoPainter::drawPoint( const GeoDataPoint & point )
{
    drawPoint( GeoDataCoordinates( point ) );
}


QRegion GeoPainter::regionFromPoint ( const GeoDataPoint & point,
                                      qreal width )
{
    return regionFromRect( GeoDataCoordinates( point ), width, width, false, 3 );
}


void GeoPainter::drawPoints (  const GeoDataCoordinates * positions,
                               int pointCount )
{
    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

    const GeoDataCoordinates * itPoint = positions;
    while( itPoint < positions + pointCount ) {
        bool visible = projection->screenCoordinates( *itPoint, d->m_viewport, d->m_x, y, pointRepeatNum, globeHidesPoint );
    
        if ( visible ) {
            // Draw all the x-repeat-instances of the point on the screen
            for( int it = 0; it < pointRepeatNum; ++it ) {
                QPainter::drawPoint( d->m_x[it], y );
            }
        }

        ++itPoint;
    }
}


void GeoPainter::drawText ( const GeoDataCoordinates & position,
                            const QString & text )
{
    // Of course in theory we could have the "isGeoProjected" parameter used
    // for drawText as well. However this would require us to convert all
    // glyphs to PainterPaths / QPolygons. From QPolygons we could create
    // GeoDataPolygons which could get painted on screen. Any patches appreciated ;-)

    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

    QSizeF textSize( fontMetrics().width( text ), fontMetrics().height() );  

    bool visible = projection->screenCoordinates( position, d->m_viewport, d->m_x, y, pointRepeatNum, textSize, globeHidesPoint );

    if ( visible ) {
        // Draw all the x-repeat-instances of the point on the screen
        for( int it = 0; it < pointRepeatNum; ++it ) {
            QPainter::drawText( d->m_x[it], y, text );
        }
    }
}


void GeoPainter::drawEllipse ( const GeoDataCoordinates & centerPosition,
                               qreal width, qreal height,
                               bool isGeoProjected )
{
    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

    if ( !isGeoProjected ) {
        bool visible = projection->screenCoordinates( centerPosition, d->m_viewport, d->m_x, y, pointRepeatNum, QSizeF( width, height ), globeHidesPoint );

        if ( visible ) {
            // Draw all the x-repeat-instances of the point on the screen
            for( int it = 0; it < pointRepeatNum; ++it ) {
                QPainter::drawEllipse(  d->m_x[it] - width / 2.0,
                                        y - height / 2.0, width, height  );
            }
        }
    }
    else {
        // Initialize variables
        qreal centerLon = 0.0;
        qreal centerLat = 0.0;
        qreal altitude = centerPosition.altitude();
        centerPosition.geoCoordinates( centerLon, centerLat,
                                       GeoDataCoordinates::Degree );

        // Ensure a valid latitude range: 
        if ( centerLat + 0.5 * height > 90.0 || centerLat - 0.5 * height < -90.0 ) {
            return;
        }

        // Don't show the ellipse if it's too small:
        GeoDataLatLonBox ellipseBox( centerLat + 0.5 * height, centerLat - 0.5 * height,
                                     centerLon + 0.5 * width,  centerLon - 0.5 * width, 
                                     GeoDataCoordinates::Degree );
        if ( !d->m_viewport->viewLatLonAltBox().intersects( ellipseBox ) ||
             !d->m_viewport->resolves( ellipseBox ) ) return;

        GeoDataLinearRing ellipse;
        qreal lon = 0.0;
        qreal lat = 0.0;

        // Optimizing the precision by determining the size which the 
        // ellipse covers on the screen:
        qreal degreeResolution = d->m_viewport->angularResolution() * RAD2DEG;
        // To create a circle shape even for very small precision we require uneven numbers:
        int precision = width / degreeResolution / 8 + 1; 
        if ( precision > 81 ) precision = 81;

        // Calculate the shape of the upper half of the ellipse:
        for ( int i = 0; i <= precision; ++i ) {
            qreal t = 1.0 - 2.0 * (qreal)(i) / (qreal)(precision);
            lat = centerLat + 0.5 * height * sqrt( 1.0 - t * t );
            lon = centerLon + 0.5 * width * t;
            ellipse << GeoDataCoordinates( lon, lat, altitude, GeoDataCoordinates::Degree );
        }
        // Calculate the shape of the lower half of the ellipse:
        for ( int i = 0; i <= precision; ++i ) {
            qreal t = 2.0 * (qreal)(i) / (qreal)(precision) -  1.0;
            lat = centerLat - 0.5 * height * sqrt( 1.0 - t * t );
            lon = centerLon + 0.5 * width * t;
            ellipse << GeoDataCoordinates( lon, lat, altitude, GeoDataCoordinates::Degree );
        }
        
        drawPolygon( ellipse );

    }

}


QRegion GeoPainter::regionFromEllipse ( const GeoDataCoordinates & centerPosition,
                                        qreal width, qreal height,
                                        bool isGeoProjected,
                                        qreal strokeWidth )
{
    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

    if ( !isGeoProjected ) {
        QRegion regions;

        bool visible = projection->screenCoordinates( centerPosition, d->m_viewport, d->m_x, y, pointRepeatNum, QSizeF( width, height ), globeHidesPoint );

        if ( visible ) {
            // Draw all the x-repeat-instances of the point on the screen
            for( int it = 0; it < pointRepeatNum; ++it ) {
                regions += QRegion( d->m_x[it] - width / 2.0,
                                    y - height / 2.0,
                                    width + strokeWidth,
                                    height + strokeWidth,
                                    QRegion::Ellipse );
            }
        }
        return regions;
    }
    else {
        // Initialize variables
        qreal centerLon = 0.0;
        qreal centerLat = 0.0;
        qreal altitude = centerPosition.altitude();
        centerPosition.geoCoordinates( centerLon, centerLat,
                                       GeoDataCoordinates::Degree );

        // Ensure a valid latitude range:
        if ( centerLat + 0.5 * height > 90.0 || centerLat - 0.5 * height < -90.0 ) {
            return QRegion();
        }

        // Don't show the ellipse if it's too small:
        GeoDataLatLonBox ellipseBox( centerLat + 0.5 * height, centerLat - 0.5 * height,
                                     centerLon + 0.5 * width,  centerLon - 0.5 * width,
                                     GeoDataCoordinates::Degree );
        if ( !d->m_viewport->viewLatLonAltBox().intersects( ellipseBox ) ||
             !d->m_viewport->resolves( ellipseBox ) ) return QRegion();

        GeoDataLinearRing ellipse;
        qreal lon = 0.0;
        qreal lat = 0.0;

        // Optimizing the precision by determining the size which the
        // ellipse covers on the screen:
        qreal degreeResolution = d->m_viewport->angularResolution() * RAD2DEG;
        // To create a circle shape even for very small precision we require uneven numbers:
        int precision = width / degreeResolution / 8 + 1;
        if ( precision > 81 ) precision = 81;

        // Calculate the shape of the upper half of the ellipse:
        for ( int i = 0; i <= precision; ++i ) {
            qreal t = 1.0 - 2.0 * (qreal)(i) / (qreal)(precision);
            lat = centerLat + 0.5 * height * sqrt( 1.0 - t * t );
            lon = centerLon + 0.5 * width * t;
            ellipse << GeoDataCoordinates( lon, lat, altitude, GeoDataCoordinates::Degree );
        }
        // Calculate the shape of the lower half of the ellipse:
        for ( int i = 0; i <= precision; ++i ) {
            qreal t = 2.0 * (qreal)(i) / (qreal)(precision) -  1.0;
            lat = centerLat - 0.5 * height * sqrt( 1.0 - t * t );
            lon = centerLon + 0.5 * width * t;
            ellipse << GeoDataCoordinates( lon, lat, altitude, GeoDataCoordinates::Degree );
        }

        return regionFromPolygon( ellipse, Qt::OddEvenFill, strokeWidth );
    }
}
    

void GeoPainter::drawImage ( const GeoDataCoordinates & centerPosition,
                             const QImage & image /*, bool isGeoProjected */ )
{
    // isGeoProjected = true would project the image/pixmap onto the globe. This
    // requires to deal with the TextureMapping classes -> should get
    // implemented later on

    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

//    if ( !isGeoProjected ) {
        bool visible = projection->screenCoordinates( centerPosition, d->m_viewport, d->m_x, y, pointRepeatNum, image.size(), globeHidesPoint );

        if ( visible ) {
            // Draw all the x-repeat-instances of the point on the screen
            for( int it = 0; it < pointRepeatNum; ++it ) {
                QPainter::drawImage( d->m_x[it] - ( image.width() / 2 ), y - ( image.height() / 2 ), image );
            }
        }
//    }
}


void GeoPainter::drawPixmap ( const GeoDataCoordinates & centerPosition,
                              const QPixmap & pixmap /* , bool isGeoProjected */ )
{
    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

//    if ( !isGeoProjected ) {
        // FIXME: Better visibility detection that takes the circle geometry into account
        bool visible = projection->screenCoordinates( centerPosition, d->m_viewport, d->m_x, y, pointRepeatNum, pixmap.size(), globeHidesPoint );

        if ( visible ) {
            // Draw all the x-repeat-instances of the point on the screen
            for( int it = 0; it < pointRepeatNum; ++it ) {
                QPainter::drawPixmap( d->m_x[it] - ( pixmap.width() / 2 ),
                                      y - ( pixmap.height() / 2 ), pixmap );
            }
        }
//    }
}


void GeoPainter::drawLine (  const GeoDataCoordinates & startPoint,
                             const GeoDataCoordinates & endPoint,
                             bool isGeoProjected )
{
    GeoDataLineString line;
    line.setTessellate( isGeoProjected );

    line << startPoint << endPoint;

    drawPolyline( line ); 
}


QRegion GeoPainter::regionFromLine (const GeoDataCoordinates & startPoint,
                                    const GeoDataCoordinates & endPoint,
                                    bool isGeoProjected,
                                    qreal strokeWidth )
{
    GeoDataLineString line;
    line.setTessellate( isGeoProjected );

    line << startPoint << endPoint;

    return regionFromPolyline( line, strokeWidth );
}


void GeoPainter::drawPolyline ( const GeoDataLineString & lineString,
                                const QString& labelText,
                                LabelPositionFlags labelPositionFlags )
{
    // Immediately leave this method now if:
    // - the object is not visible in the viewport or if
    // - the size of the object is below the resolution of the viewport
    if ( ! d->m_viewport->viewLatLonAltBox().intersects( lineString.latLonAltBox() ) ||
         ! d->m_viewport->resolves( lineString.latLonAltBox() )
        )
    {
        // mDebug() << "LineString doesn't get displayed on the viewport";
        return;
    }

    QVector<QPolygonF*> polygons;
    d->createPolygonsFromLineString( lineString, polygons );

    if ( labelText.isEmpty() ) {
        foreach( QPolygonF* itPolygon, polygons ) {
            ClipPainter::drawPolyline( *itPolygon );
        }
    }
    else {
        int labelWidth = fontMetrics().width( labelText );
        int labelAscent = fontMetrics().ascent();

        QVector<QPointF> labelNodes;
        foreach( QPolygonF* itPolygon, polygons ) {
            labelNodes.clear();
            ClipPainter::drawPolyline( *itPolygon, labelNodes, labelPositionFlags );
            if ( !labelNodes.isEmpty() ) {
                foreach ( const QPointF& labelNode, labelNodes ) {
                    QPointF labelPosition = labelNode + QPointF( 3.0, -2.0 );

                    // FIXME: This is a Q&D fix.
                    qreal xmax = viewport().width() - 10.0 - labelWidth;
                    if ( labelPosition.x() > xmax ) labelPosition.setX( xmax ); 
                    qreal ymin = 10.0 + labelAscent;
                    if ( labelPosition.y() < ymin ) labelPosition.setY( ymin );
                    qreal ymax = viewport().height() - 10.0 - labelAscent;
                    if ( labelPosition.y() > ymax ) labelPosition.setY( ymax );
 
                    drawText( labelPosition, labelText );
                }
            }
        }
    }
    qDeleteAll( polygons );
}


QRegion GeoPainter::regionFromPolyline ( const GeoDataLineString & lineString,
                                         qreal strokeWidth )
{
    // Immediately leave this method now if:
    // - the object is not visible in the viewport or if
    // - the size of the object is below the resolution of the viewport
    if ( ! d->m_viewport->viewLatLonAltBox().intersects( lineString.latLonAltBox() ) ||
         ! d->m_viewport->resolves( lineString.latLonAltBox() )
        )
    {
        // mDebug() << "LineString doesn't get displayed on the viewport";
        return QRegion();
    }

    QList<QRegion> regions;
    QPainterPath painterPath;

    QVector<QPolygonF*> polygons;
    d->createPolygonsFromLineString( lineString, polygons );

    foreach( QPolygonF* itPolygon, polygons ) {
        painterPath.addPolygon( *itPolygon );
    }

    qDeleteAll( polygons );

    QPainterPathStroker stroker;
    stroker.setWidth( strokeWidth );
    QPainterPath strokePath = stroker.createStroke( painterPath );

    return QRegion( strokePath.toFillPolygon().toPolygon(), Qt::WindingFill );
}


void GeoPainter::drawPolygon ( const GeoDataLinearRing & linearRing,
                               Qt::FillRule fillRule )
{
    // Immediately leave this method now if:
    // - the object is not visible in the viewport or if
    // - the size of the object is below the resolution of the viewport
    if ( ! d->m_viewport->viewLatLonAltBox().intersects( linearRing.latLonAltBox() ) ||
         ! d->m_viewport->resolves( linearRing.latLonAltBox() )
        )
    {
        // mDebug() << "Polygon doesn't get displayed on the viewport";
        return;
    }

    if ( !linearRing.latLonAltBox().crossesDateLine() ) {
        QVector<QPolygonF*> polygons;
        d->createPolygonsFromLinearRing( linearRing, polygons );

        foreach( QPolygonF* itPolygon, polygons ) {
            ClipPainter::drawPolygon( *itPolygon, fillRule );
        }

        qDeleteAll( polygons );
    }
    else {
        QPen polygonPen = pen();
        setPen( Qt::NoPen );

        QVector<QPolygonF*> polygons;
        d->createPolygonsFromLinearRing( linearRing, polygons );

        foreach( QPolygonF* itPolygon, polygons ) {
            ClipPainter::drawPolygon( *itPolygon, fillRule );
        }

        qDeleteAll( polygons );

        setPen( polygonPen );
        GeoDataLineString lineString( linearRing );

        lineString << lineString.first();

        QVector<QPolygonF*> polylines;
        d->createPolygonsFromLineString( lineString, polylines );

        foreach( QPolygonF* itPolygon, polylines ) {
            ClipPainter::drawPolyline( *itPolygon );
        }

        qDeleteAll( polylines );        
    }
}


QRegion GeoPainter::regionFromPolygon ( const GeoDataLinearRing & linearRing,
                                        Qt::FillRule fillRule, qreal strokeWidth )
{
    // Immediately leave this method now if:
    // - the object is not visible in the viewport or if
    // - the size of the object is below the resolution of the viewport
    if ( ! d->m_viewport->viewLatLonAltBox().intersects( linearRing.latLonAltBox() ) ||
         ! d->m_viewport->resolves( linearRing.latLonAltBox() )
        )
    {
        return QRegion();
    }

    QRegion regions;

    QVector<QPolygonF*> polygons;
    d->createPolygonsFromLinearRing( linearRing, polygons );

    if ( strokeWidth == 0 ) {
        // This is the faster way
        foreach( QPolygonF* itPolygon, polygons ) {
            regions += QRegion ( (*itPolygon).toPolygon(), fillRule );
        }
    }
    else {
        QPainterPath painterPath;
        foreach( QPolygonF* itPolygon, polygons ) {
            painterPath.addPolygon( *itPolygon );
        }

        QPainterPathStroker stroker;
        stroker.setWidth( strokeWidth );
        QPainterPath strokePath = stroker.createStroke( painterPath );
        painterPath = painterPath.united( strokePath );
        regions = QRegion( painterPath.toFillPolygon().toPolygon() );
    }

    qDeleteAll( polygons );

    return regions;
}


void GeoPainter::drawPolygon ( const GeoDataPolygon & polygon,
                               Qt::FillRule fillRule )
{
    // If the object is not visible in the viewport return 
    if ( ! d->m_viewport->viewLatLonAltBox().intersects( polygon.outerBoundary().latLonAltBox() ) ||
    // If the size of the object is below the resolution of the viewport then return
         ! d->m_viewport->resolves( polygon.outerBoundary().latLonAltBox() )
        )
    {
        // mDebug() << "Polygon doesn't get displayed on the viewport";
        return;
    }
    // mDebug() << "Drawing Polygon";

    // Creating the outer screen polygons first
    QVector<QPolygonF*> outerPolygons;
    d->createPolygonsFromLinearRing( polygon.outerBoundary(), outerPolygons );

    // Now creating the "holes" by cutting away the inner boundaries:

    // In QPathClipper We Trust ...
    // ... and in the speed of a threesome of nested foreachs!

    QVector<GeoDataLinearRing> innerBoundaries = polygon.innerBoundaries(); 
    foreach( const GeoDataLinearRing& itInnerBoundary, innerBoundaries ) {
        QVector<QPolygonF*> innerPolygons;
        d->createPolygonsFromLinearRing( itInnerBoundary, innerPolygons );
        
        foreach( QPolygonF* itOuterPolygon, outerPolygons ) {
            foreach( QPolygonF* itInnerPolygon, innerPolygons ) {
                *itOuterPolygon = itOuterPolygon->subtracted( *itInnerPolygon );
            }
        }
        qDeleteAll( innerPolygons );    
    }

    foreach( QPolygonF* itOuterPolygon, outerPolygons ) {
        ClipPainter::drawPolygon( *itOuterPolygon, fillRule );
    }

    qDeleteAll( outerPolygons );    
}


void GeoPainter::drawRect ( const GeoDataCoordinates & centerCoordinates,
                            qreal width, qreal height,
                            bool isGeoProjected )
{
    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

    if ( !isGeoProjected ) {
        bool visible = projection->screenCoordinates( centerCoordinates, 
                       d->m_viewport, d->m_x, y, pointRepeatNum, QSizeF( width, height ), globeHidesPoint );

        if ( visible ) {
            // Draw all the x-repeat-instances of the point on the screen
            for( int it = 0; it < pointRepeatNum; ++it ) {
                QPainter::drawRect( d->m_x[it] - ( width / 2.0 ), y - ( height / 2.0 ), width, height );
            }
        }
    }
    else {
        drawPolygon( d->createLinearRingFromGeoRect( centerCoordinates, width, height ),
                     Qt::OddEvenFill );
    }
}


QRegion GeoPainter::regionFromRect ( const GeoDataCoordinates & centerCoordinates,
                                     qreal width, qreal height,
                                     bool isGeoProjected,
                                     qreal strokeWidth )
{
    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();


    if ( !isGeoProjected ) {

        QRegion regions;

        bool visible = projection->screenCoordinates( centerCoordinates,
                       d->m_viewport, d->m_x, y, pointRepeatNum, QSizeF( width, height ), globeHidesPoint );

        if ( visible ) {
            // Draw all the x-repeat-instances of the point on the screen
            for( int it = 0; it < pointRepeatNum; ++it ) {
                regions += QRegion( d->m_x[it] - ( ( width + strokeWidth ) / 2.0 ),
                                    y - ( ( height + strokeWidth ) / 2.0 ),
                                    width + strokeWidth,
                                    height + strokeWidth );
            }
        }
        return regions;
    }
    else {
        return regionFromPolygon( d->createLinearRingFromGeoRect( centerCoordinates, width, height ),
                                  Qt::OddEvenFill, strokeWidth );
    }
}


void GeoPainter::drawRoundRect ( const GeoDataCoordinates &centerPosition,
                                 int width, int height,
                                 int xRnd, int yRnd,
                                 bool isGeoProjected )
{
    int pointRepeatNum;
    qreal y;
    bool globeHidesPoint;
    AbstractProjection *projection = d->m_viewport->currentProjection();

    if ( !isGeoProjected ) {
        // FIXME: Better visibility detection that takes the circle geometry into account
        bool visible = projection->screenCoordinates( centerPosition, d->m_viewport, d->m_x, y, pointRepeatNum, QSizeF( width, height ), globeHidesPoint );

        if ( visible ) {
            // Draw all the x-repeat-instances of the point on the screen
            for( int it = 0; it < pointRepeatNum; ++it ) {
                QPainter::drawRoundRect( d->m_x[it] - ( width / 2 ), y - ( height / 2 ), width, height, xRnd, yRnd );
            }
        }
    }
}



// Reenabling QPainter methods.

void GeoPainter::drawLine ( int x1, int y1, int x2, int y2 )
{
    QPainter::drawLine( x1, y1, x2, y2 );
}

void GeoPainter::drawText ( int x, int y, const QString &text )
{
    QPainter::drawText( x, y, text );
}

void GeoPainter::drawText(  const QRect & rectangle, int flags, const QString & text, QRect * boundingRect )
{
    QPainter::drawText( rectangle, flags, text, boundingRect );
}

void GeoPainter::drawEllipse ( int x, int y, int width, int height )
{
    QPainter::drawEllipse( x, y, width, height);
}

void GeoPainter::drawEllipse ( const QRectF & rectangle )
{
    QPainter::drawEllipse( rectangle );
}

void GeoPainter::drawImage ( const QRect &target,
                             const QImage &image,
                             const QRect &source,
                             Qt::ImageConversionFlags flags )
{
    QPainter::drawImage( target, image, source, flags );
}

void GeoPainter::drawImage( const QRect& rect,
                            const QImage& image )
{
    QPainter::drawImage( rect, image );
}

void GeoPainter::drawImage( const QRectF& rect,
                            const QImage& image )
{
    QPainter::drawImage( rect, image );
}

void GeoPainter::drawPixmap( int x, int y, const QPixmap &pixmap )
{
    QPainter::drawPixmap( x, y, pixmap );
}

void GeoPainter::drawPixmap( const QPointF &point, const QPixmap & pixmap )
{
    QPainter::drawPixmap( point, pixmap );
}

void GeoPainter::drawPixmap( const QPoint &point, const QPixmap & pixmap )
{
    QPainter::drawPixmap( point, pixmap );
}

void GeoPainter::drawPoint ( int x, int y )
{
    QPainter::drawPoint( x, y );
}

void GeoPainter::drawPolyline( const QPolygonF &polyline )
{
    ClipPainter::drawPolyline( polyline );
}

void GeoPainter::drawPolygon( const QPolygonF &polygon )
{
    ClipPainter::drawPolygon( polygon );
}

void GeoPainter::drawRect ( const QRectF &rectangle )
{
    QPainter::drawRect( rectangle );
}

void GeoPainter::drawRect ( const QRect &rectangle )
{
    QPainter::drawRect( rectangle );
}

void GeoPainter::drawRect ( int x, int y, int width, int height )
{
    QPainter::drawRect( x, y, width, height);
}

void GeoPainter::drawText ( const QPointF & position, const QString & text )
{
    QPainter::drawText( position, text );
}

void GeoPainter::drawText ( const QPoint & position, const QString & text )
{
    QPainter::drawText( position, text );
}
