aclock.cpp

linux qte 2.3.7下开发温度计控件

/****************************************************************************
** $Id: qt/examples/aclock/aclock.cpp   2.3.7   edited 2001-01-26 $
**
** Copyright (C) 1992-2000 Trolltech AS.  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 "aclock.h"
#include <qtimer.h>
#include <qpainter.h>
#include <qbitmap.h>
#include <iostream.h>
//
// Constructs an analog clock widget that uses an internal QTimer.
//


AnalogClock::AnalogClock( QWidget *parent, const char *name )
    : QWidget( parent, name, Qt::WStyle_Customize  | Qt::WStyle_NoBorder)
{
    temp=-25;
	step = 1;
	demo = 1;
    setMinimumSize( 121, 286 );
    setMaximumSize( 121, 286 );

    QTimer *internalTimer = new QTimer( this );	// create internal timer
    connect( internalTimer, SIGNAL(timeout()), SLOT(timeout()) );
    internalTimer->start( 50 );		// emit signal every 5 seconds
    
    //QPainter paint(this);
    //QPixmap *pm;
    //pm = new QPixmap("thermometer2.png");
    //paint.drawPixmap(0,0, *pm,0,0, -1, -1);
    //bitBlt( this, 0, 0, *QPixmap("thermometer2.png") );

    setBackgroundPixmap( QPixmap("thermometer2.png") ); //背景有问题
}

//
// The QTimer::timeout() signal is received by this slot.
//

void AnalogClock::timeout()
{
    if(demo){
        if(temp>40 || temp <-30)
           step=-step;
        temp+=step;
    }
    update();
}


void AnalogClock::paintEvent( QPaintEvent * )
{
    QPainter paint( this );
    paint.setBrush( red );
	paint.setPen( red );
    drawClock( &paint );
}

// If the clock is transparent, we use updateMask()
// instead of paintEvent()

void AnalogClock::drawClock( QPainter *paint )
{
    paint->save();
    
    //paint->setWindow( 0,0, 1000,5000 );
    //QPixmap *pm;
    //pm = new QPixmap("thermometer2.png");
    float height=192*((temp+30)/70.0);
    
    paint->save();	
    //paint->drawPixmap(0,0, *pm,0,0, -1, -1);
    paint->drawRect ( 58, 215, 6, (-(int)height) ) ;
    paint->restore();	

///////////////////////////////////////////////////标尺的作用，勿删
	/*int y1=0;
	int y2=0;
	paint->setPen(blue);
	for ( int i=0; i<10; i++ ) {  	
	paint->drawLine( 450,y1, 750,y1) ;
	y1+=500;
  	}

	for ( int i=0; i<50; i++ ) {  	
	paint->drawLine( 450,y2, 550,y2) ;
	y2+=100;
  	}

	paint->setPen( yellow) ;
	paint->drawLine( 450,220, 750,220) ;
	paint->drawLine( 450,4280, 750,4280) ;*/
////////////////////////////////////////////////////
}


//end