skymapqdraw.cpp

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/***************************************************************************
                  skymapqdraw.cpp  -  K Desktop Planetarium
                             -------------------
    begin                : Tue Dec 21 2010 08:36 AM UTC-6
    copyright            : (C) 2010 Akarsh Simha
    email                : akarsh.simha@kdemail.net
 ***************************************************************************/
/***************************************************************************
 *                                                                         *
 *   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 "skymapqdraw.h"
#include "skymapcomposite.h"
#include "skyqpainter.h"
#include "skymap.h"
#include "printing/legend.h"

SkyMapQDraw::SkyMapQDraw( SkyMap *sm ) : QWidget( sm ), SkyMapDrawAbstract( sm ) {
    m_SkyPixmap = new QPixmap( width(), height() );
}

SkyMapQDraw::~SkyMapQDraw() {
    delete m_SkyPixmap;
}

void SkyMapQDraw::paintEvent( QPaintEvent *event ) {
    Q_UNUSED(event);
    // This is machinery to prevent multiple concurrent paint events / recursive paint events
    if( m_DrawLock ) {
        kDebug() << "I just prevented a recursive / concurrent draw!";
        return;
    }
    setDrawLock( true );

    calculateFPS();


    //If computeSkymap is false, then we just refresh the window using the stored sky pixmap
    //and draw the "overlays" on top.  This lets us update the overlay information rapidly
    //without needing to recompute the entire skymap.
    //use update() to trigger this "short" paint event; to force a full "recompute"
    //of the skymap, use forceUpdate().

    if (!m_SkyMap->computeSkymap)
        {
            QPainter p;
            p.begin( this );
            p.drawLine(0,0,1,1); // Dummy operation to circumvent bug. TODO: Add details
            p.drawPixmap( 0, 0, *m_SkyPixmap ); 
            drawOverlays(p);
            p.end();

            setDrawLock( false );
            return ; // exit because the pixmap is repainted and that's all what we want
        }

    // FIXME: used to to notify infobox about possible change of object coordinates
    // Not elegant at all. Should find better option
    m_SkyMap->showFocusCoords();
    m_SkyMap->setupProjector();
    
    SkyQPainter psky(this, m_SkyPixmap); 
    //FIXME: we may want to move this into the components.
    psky.begin();
    
    //Draw all sky elements
    psky.drawSkyBackground();
    m_KStarsData->skyComposite()->draw( &psky );
    //Finish up
    psky.end();
    
    QPainter psky2;
    psky2.begin( this );
    psky2.drawLine(0,0,1,1); // Dummy op.
    psky2.drawPixmap( 0, 0, *m_SkyPixmap );
    drawOverlays(psky2);
    psky2.end();

    if(m_SkyMap->m_previewLegend)
    {
        m_SkyMap->m_legend.paintLegend(m_SkyPixmap);
    }

    m_SkyMap->computeSkymap = false;    // use forceUpdate() to compute new skymap else old pixmap will be shown

    setDrawLock( false );

}

void SkyMapQDraw::resizeEvent( QResizeEvent *e ) {
    Q_UNUSED(e);
    delete m_SkyPixmap;
    m_SkyPixmap = new QPixmap( width(), height() );
}