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100 lines
2.3 KiB
100 lines
2.3 KiB
/****************************************************************************
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <qtimer.h>
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#include <qpainter.h>
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#include <qapplication.h>
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#include <stdlib.h> // defines rand() function
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#include "forever.h"
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//
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// Forever - a widget that draws rectangles forever.
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//
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//
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// Constructs a Forever widget.
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//
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Forever::Forever( QWidget *parent, const char *name )
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: QWidget( parent, name )
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{
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for (int a=0; a<numColors; a++) {
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colors[a] = QColor( rand()&255,
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rand()&255,
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rand()&255 );
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}
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rectangles = 0;
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startTimer( 0 ); // run continuous timer
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QTimer * counter = new QTimer( this );
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connect( counter, SIGNAL(timeout()),
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this, SLOT(updateCaption()) );
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counter->start( 1000 );
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}
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void Forever::updateCaption()
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{
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QString s;
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s.sprintf( "Qt Example - Forever - %d rectangles/second", rectangles );
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rectangles = 0;
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setCaption( s );
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}
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//
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// Handles paint events for the Forever widget.
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//
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void Forever::paintEvent( QPaintEvent * )
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{
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QPainter paint( this ); // painter object
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int w = width();
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int h = height();
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if(w <= 0 || h <= 0)
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return;
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paint.setPen( NoPen ); // do not draw outline
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paint.setBrush( colors[rand() % numColors]);// set random brush color
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QPoint p1( rand()%w, rand()%h ); // p1 = top left
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QPoint p2( rand()%w, rand()%h ); // p2 = bottom right
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QRect r( p1, p2 );
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paint.drawRect( r ); // draw filled rectangle
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}
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//
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// Handles timer events for the Forever widget.
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//
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void Forever::timerEvent( QTimerEvent * )
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{
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for ( int i=0; i<100; i++ ) {
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repaint( FALSE ); // repaint, don't erase
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rectangles++;
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}
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}
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//
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// Create and display Forever widget.
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//
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int main( int argc, char **argv )
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{
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QApplication a( argc, argv ); // create application object
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Forever always; // create widget
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always.resize( 400, 250 ); // start up with size 400x250
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a.setMainWidget( &always ); // set as main widget
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always.setCaption("Qt Example - Forever");
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always.show(); // show widget
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return a.exec(); // run event loop
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}
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