QtCollider/widgets/QcCanvas.cpp

   1 /************************************************************************
   2 *
   3 * Copyright 2010 Jakob Leben (jakob.leben@gmail.com)
   4 *
   5 * This file is part of SuperCollider Qt GUI.
   6 *
   7 * This program is free software: you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation, either version 3 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *
  20 ************************************************************************/
  21
  22 #include "QcCanvas.h"
  23 #include "../painting.h"
  24 #include "../Common.h"
  25
  26 #include <QPainter>
  27
  28 QcCanvas::QcCanvas( QWidget *parent )
  29 : QWidget( parent ),
  30   _paint( false ),
  31   _repaintNeeded( true ),
  32   _clearOnRefresh( true ),
  33   _clearOnce( false ),
  34   _resize( false ),
  35   _fps( 60.f ),
  36   _fpsActual( 0.f ),
  37   _timerId( 0 ),
  38   _animating( false ),
  39   _frameCount( 0 ),
  40   _meterPeriod( 1000 ),
  41   _meterFrames( 0 )
  42 {
  43   //_bkgColor = palette().color( QPalette::Background );
  44 }
  45
  46 float QcCanvas::frameRate() const
  47 {
  48   return _fpsActual;
  49 }
  50
  51 void QcCanvas::setFrameRate( float rate )
  52 {
  53   if( rate != _fps ) {
  54     _fps = rate;
  55     if( _animating && _fps > 0 ) {
  56       // restart animation timer with new frame rate
  57       killTimer( _timerId );
  58       _timerId = startTimer( 1000.f / _fps );
  59     }
  60   }
  61 }
  62
  63 void QcCanvas::refresh()
  64 {
  65   _repaintNeeded = true;
  66   update();
  67 }
  68
  69 void QcCanvas::clear()
  70 {
  71   _clearOnce = true;
  72 }
  73
  74 void QcCanvas::animate( bool on )
  75 {
  76   if( on ) {
  77     if( !_animating && _fps > 0 ) {
  78       _frameCount = 0;
  79       _animating = true;
  80       _meterTime.start();
  81       _timerId = startTimer( 1000.f / _fps );
  82       _fpsTimer.start( _meterPeriod, this );
  83     }
  84   }
  85   else if( _animating ) {
  86       killTimer( _timerId );
  87       _fpsTimer.stop();
  88       _animating = false;
  89   }
  90 }
  91
  92 void QcCanvas::customEvent( QEvent *e )
  93 {
  94   if( e->type() == (QEvent::Type) QtCollider::Event_Refresh ) {
  95     e->accept();
  96     refresh();
  97   }
  98 }
  99
 100 void QcCanvas::resizeEvent( QResizeEvent * )
 101 {
 102   _resize = true;
 103   refresh();
 104 }
 105
 106 void QcCanvas::paintEvent( QPaintEvent * )
 107 {
 108   if( _paint && _repaintNeeded ) {
 109     if( _resize ) {
 110       _pixmap = QPixmap( size() );
 111       _resize = false;
 112       _clearOnce = true;
 113     }
 114
 115     if( _clearOnRefresh || _clearOnce ) {
 116       _pixmap.fill( QColor(0,0,0,0) );
 117       _clearOnce = false;
 118     }
 119
 120     QPainter pixPainter( &_pixmap );
 121     Q_EMIT( painting(&pixPainter) );
 122     _repaintNeeded = false;
 123   }
 124
 125   QPainter p(this);
 126   if( _bkgColor.isValid() ) p.fillRect( rect(), _bkgColor );
 127   if( _paint ) p.drawPixmap( rect(), _pixmap );
 128 }
 129
 130 void QcCanvas::timerEvent( QTimerEvent *e )
 131 {
 132   if( e->timerId() == _timerId ) {
 133     ++_frameCount;
 134     ++_meterFrames;
 135     _repaintNeeded = true;
 136     repaint();
 137   }
 138   else if( e->timerId() == _fpsTimer.timerId() ) {
 139     // recalc actual fps
 140     float dTime = _meterTime.elapsed();
 141     _fpsActual = (dTime > 0) ? (_meterFrames * 1000.f / dTime) : 0.f;
 142     // reset fps meter
 143     _meterTime.restart();
 144     _meterFrames = 0;
 145   }
 146 }