#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 );}