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Diffstat (limited to 'examples/demo/display.cpp')
| -rw-r--r-- | examples/demo/display.cpp | 230 |
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(); +} + |