drawdemo.cpp

gx 公司的2410-ep qt试验源代吗。 还有说明文档。

/****************************************************************************
** $Id: /sample/8/drawdemo.cpp   2.3.2   edited 2004-10-12 $
**
** Copyright (C) 2004-2005 OURSELEC AS.  All rights reserved.
** Http://www.ourselec.com
** This file is part of an example program for Qt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#define PI 3.1415926
	
#include <stdio.h>
#include "drawdemo.h"
	
DrawDemo::DrawDemo( QWidget *parent, const char *name )
			:QWidget( parent, name )
{
		setCaption( "OURS_qt_Example" );
	
		frame = new QFrame( this, "frame" );
		frame->setBackgroundColor( black );
		frame->setGeometry( QRect( 40, 40, 402, 252 ) );	
	
		for( int i=0; i<200; i++ ) {
			buffer[i] = ( int )( sin( (i*PI) /100 ) * 100 );
		}
		
		QTimer *timer = new QTimer( this, "timer" );
		connect( timer, SIGNAL( timeout() ), this, SLOT( flushBuff() ) );
		timer->start( 30 );
}
	
void DrawDemo::flushBuff()
{
		int tmp = buffer[0];
		int i;
		for( i=0; i<200; i++ ) {
			buffer[i] = buffer[i+1];
		}
		buffer[199] = tmp;
		repaint( 0, 0, 480, 320, TRUE );
}

void DrawDemo::paintEvent( QPaintEvent * )
{
		frame->erase( 0, 0, 400, 320 );
		QPainter painter( frame );
		QPoint beginPoint;
		QPoint endPoint;
		painter.setPen( blue );
		for( int i=0; i<199; i++ ) {
			beginPoint.setX( 2*i );
			beginPoint.setY( buffer[i] +125 );
			endPoint.setX( 2*i+1 );
			endPoint.setY( buffer[i+1] +125 );
			painter.drawLine( beginPoint, endPoint );
		}
}