Add Qt3 development HEAD version

1 files changed, 230 insertions, 0 deletions

diff --git a/examples/demo/display.cpp b/examples/demo/display.cpp
new file mode 100644
index 0000000..eceef05
--- /dev/null
+++ b/examples/demo/display.cpp
@@ -0,0 +1,230 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include "display.h"
+
+#include <qpainter.h>
+#include <qlayout.h>
+#include <qtimer.h>
+#include <qpushbutton.h>
+#include <qframe.h>
+#include <qdial.h>
+#include <qlcdnumber.h>
+#include <qprogressbar.h>
+#include <qspinbox.h>
+
+#include <math.h>
+
+Screen::Screen(  QWidget *parent, const char *name )
+    : QFrame( parent, name )
+{
+    setLineWidth( FrameWidth );
+    setFrameStyle( Panel | Sunken );
+    setBackgroundMode( PaletteBase );
+    setSizePolicy( QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding );
+    setPaletteBackgroundColor( black );
+    setPaletteForegroundColor( blue );
+
+    yval = new int[width()];
+    memset( yval, 0, sizeof(int)*width() );
+    pos0 = 0;
+    t0 = 0;
+    step = 0;
+}
+
+Screen::~Screen()
+{
+    delete yval;
+}
+
+void Screen::resizeEvent( QResizeEvent *e )
+{
+    delete yval;
+    int w = e->size().width();
+    yval = new int[w];
+    memset( yval, 0, sizeof(int)*w);
+}
+
+void Screen::animate()
+{
+    if ( step == 0 )
+	return;
+
+    int t = t0;
+    int p = pos0;
+    if ( step < 0 ) {
+	t += width() + step;
+    } else {
+	t -= step;
+	p -= step;
+	if ( p < 0 )
+	    p += width();
+   }
+
+    for ( int i = 0; i < QABS( step ); i++ ) {
+	int y = (int)((height()-FrameWidth)/2 * sin( 3.1415*(double)t/180.0 ));
+	yval[ p ] = y;
+	++t;
+	t %= 360;
+	++p;
+	p %= width();
+    }
+    t0 -= step;
+    if ( t0 < 0 )
+	t0 += 360;
+    pos0 = (pos0 - step) % width();
+    if ( pos0 < 0 )
+	pos0 += width();
+
+    scroll( step, 0, QRect( FrameWidth, FrameWidth, width()-2*FrameWidth, height()-2*FrameWidth ));
+}
+
+void Screen::setStep( int s )
+{
+    step = s;
+}
+
+void Screen::drawContents( QPainter *p )
+{
+    QRect r = p->hasClipping() ?
+	      p->clipRegion().boundingRect() : contentsRect();
+
+    int vp = ( r.left() - FrameWidth + pos0 ) % width();
+    int y0 = FrameWidth + height()/2;
+    
+    for ( int x = r.left(); x <= r.right(); x++ ) {
+	p->drawLine( x, y0 + yval[ vp ], x, r.bottom());
+	++vp;
+	vp %= width();
+    }
+}
+
+/***********************************************************************/
+
+Curve::Curve( QWidget *parent, const char *name )
+    : QFrame( parent, name )
+{
+    setLineWidth( FrameWidth );
+    setFrameStyle( Panel | Sunken );
+    setBackgroundMode( PaletteBase );
+    setPaletteBackgroundColor(black);
+    setPaletteForegroundColor(red);
+    setSizePolicy( QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding );
+
+    shift = 0;
+    n = 1;
+}
+
+void Curve::drawContents( QPainter *p )
+{
+    p->moveTo( width()/2, height()/2 + (int)(90.0*sin( double(shift)*3.1415/180.0)));
+
+    for ( double a = 0.0; a < 360.0; a += 1.0 ) {
+	double rad = 3.1415 / 180.0 * a;
+	double x = width()/2 + 90.0 * sin(rad);
+	double y = height()/2 + 90.0 * sin(n * rad + double(shift)*3.1415/180.0);
+	p->lineTo( int(x), int(y) );
+    }
+}
+
+void Curve::animate()
+{
+    shift = (shift + 1) % 360;
+    update( FrameWidth, FrameWidth, width() - 2*FrameWidth, height() - 2*FrameWidth );
+}
+
+void Curve::setFactor( int f )
+{
+    n = f;
+}
+
+/***********************************************************************/
+
+DisplayWidget::DisplayWidget( QWidget *parent, const char *name )
+    : QWidget( parent, name )
+{
+    timer = 0;
+
+    QVBoxLayout *vbox = new QVBoxLayout( this, 10 );
+
+    QHBoxLayout *hbox = new QHBoxLayout( vbox );
+    screen = new Screen( this );
+    dial = new QDial( this );
+    dial->setNotchesVisible( TRUE );
+    dial->setRange( -10, 10 );
+    dial->setValue( 1 );
+    screen->setStep( dial->value() );
+    connect( dial, SIGNAL( valueChanged( int )),
+	     screen, SLOT( setStep( int )));
+    lcd = new QLCDNumber( 2, this );
+    lcd->setSizePolicy( QSizePolicy::MinimumExpanding, QSizePolicy::Preferred );
+    lcdval = 0;
+    
+    hbox->addWidget( screen );
+
+    QVBoxLayout *vb2 = new QVBoxLayout( hbox );
+
+    curve = new Curve( this );
+    spin = new QSpinBox( 1, 10, 1, this );
+    connect( spin, SIGNAL( valueChanged( int )), curve, SLOT( setFactor( int )));
+    spin->setValue( 2 );
+    vb2->addWidget( curve );
+    vb2->addWidget( spin );
+    
+    QHBoxLayout *hbox2 = new QHBoxLayout( vb2 );
+    
+    hbox2->addWidget( dial );
+    hbox2->addWidget( lcd );
+    
+    bar = new QProgressBar( 10, this );
+    tbar = 0;
+
+    vbox->addWidget( bar );
+}
+
+void DisplayWidget::run()
+{
+    if ( !timer ) {
+	timer = new QTimer( this );
+	connect( timer, SIGNAL( timeout() ), SLOT( tick() ) );
+    }
+
+    timer->start( 5 );
+}
+
+void DisplayWidget::stop()
+{
+    timer->stop();
+}
+
+void DisplayWidget::tick()
+{
+    // sine
+    screen->animate();
+    // Lissajous
+    curve->animate();
+    // lcd display
+    lcd->display( ++lcdval % 100 );
+    // progress bar
+    bar->setProgress( 5 + (int)(5*sin( 3.1415 * (double)tbar / 180.0 )));
+    ++tbar;
+    tbar %= 360;
+}
+
+void DisplayWidget::showEvent( QShowEvent * )
+{
+    run();
+    screen->repaint();
+}
+
+void DisplayWidget::hideEvent( QHideEvent * )
+{
+    stop();
+}
+