cannon.cpp

我在我的EP9315上写的两个QT程序

#include "cannon.h"
#include <qpainter.h>
#include <qtimer.h>

#include <math.h>

CannonField::CannonField( QWidget *parent, const char *name )
         :QWidget( parent, name )
{
 ang = 45;
 
 timerCount = 0 ;
 autoShootTimer = new QTimer ( this, "movement handler" );
 connect( autoShootTimer,SIGNAL( timeout() ), this, SLOT( timerTest() ) );

 setPalette( QPalette( QColor( 250, 250, 200) ) );
 
}

void CannonField::setAngle( int degrees )
{
  if ( degrees < 5 )
     degrees = 5;
  if ( degrees > 70 )
     degrees = 70;
  if (ang == degrees )
     return;
  ang =degrees;
  repaint();
  emit angleChanged ( ang );
}

void CannonField::paintEvent( QPaintEvent * )
{
  QString s = "K=" + QString::number( ang );
  QPainter p( this );
  p.drawLine( 0,height()-20,width()-10,height()-20 );
  p.drawLine( width()-10,height()-20,width()-16,height()-16 );
  p.drawLine( width()-10,height()-20,width()-16,height()-24 );
  p.drawLine( 10,height(),10,20);
  p.drawLine( 10,20,6,24);
  p.drawLine( 10,20,14,24);
  p.drawText( 3,height()-10, "O");
  p.drawText( 30,height()-10, "1"); 
  p.drawText( 50,height()-10, "2");
  p.drawText( 70,height()-10, "3");
  p.drawText( width()-30, height()-30, "t/sec");
  p.drawText( 16,height()-50, "100"); 
  p.drawText( 16,height()-80, "200");
  p.drawText( 16,height()-110, "300");
  p.drawText( 5, 10, "p/mpa");
  p.drawText( width()-40, 30, s );
}

void CannonField::paintSet()
{
 QPainter p( this );
 p.drawLine( 10, height()-20, 30, height()-ang-70 );
 p.drawLine( 30, height()-ang-70, 50, height()-ang-70 );
 p.drawLine( 50, height()-ang-70, 70, height()-20 );
}

void CannonField::simulate()
{
 if(autoShootTimer->isActive())
  return;
  timerCount = 0 ;
  autoShootTimer->start(200);
}

void CannonField::timerTest()
{
 timerCount++;
// if ( timerCount >10 ){
  
 // QString s = "K=" + QString::number( sin(ang*3.14/180) );
  QPainter p( this );
  p.setPen( red );
 // p.drawText( width()-40, 10, s );
  if( timerCount <=10 )
  p.drawLine( 10, height()-20,10+timerCount*2, qRound( height()-20-timerCount*20*sin(ang*3.14/180) ) );
  
   else if(  timerCount <= 20 )
  p.drawLine( 30, qRound( height()-20-10*20*sin(ang*3.14/180) ), 10+timerCount*2, qRound( height()-20-10*20*sin   (ang*3.14/180) ) );
  
   else if(  timerCount <= 30 )
  p.drawLine( 50, qRound( height()-20-10*20*sin(ang*3.14/180) ),  10+timerCount*2, qRound( height()-20- 10*20*sin(ang*3.14/180) + (timerCount-20)*20*sin(ang*3.14/180) ) )  ;
 
   else
 // if ( timerCount > 30 )
  autoShootTimer->stop( );
  
 //return;
}

QSizePolicy CannonField::sizePolicy() const
{
  return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );

}