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/****************************************************************************
**
** 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();
}
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