t14/cannon.cpp Example File
/****************************************************************
**
** Implementation CannonField class, TQt tutorial 14
**
****************************************************************/
#include "cannon.h"
#include <tqtimer.h>
#include <tqpainter.h>
#include <ntqpixmap.h>
#include <tqdatetime.h>
#include <math.h>
#include <stdlib.h>
CannonField::CannonField( TQWidget *parent, const char *name )
: TQWidget( parent, name )
{
ang = 45;
f = 0;
timerCount = 0;
autoShootTimer = new TQTimer( this, "movement handler" );
connect( autoShootTimer, TQ_SIGNAL(timeout()),
this, TQ_SLOT(moveShot()) );
shoot_ang = 0;
shoot_f = 0;
target = TQPoint( 0, 0 );
gameEnded = FALSE;
barrelPressed = FALSE;
setPalette( TQPalette( TQColor( 250, 250, 200) ) );
newTarget();
}
void CannonField::setAngle( int degrees )
{
if ( degrees < 5 )
degrees = 5;
if ( degrees > 70 )
degrees = 70;
if ( ang == degrees )
return;
ang = degrees;
repaint( cannonRect(), FALSE );
emit angleChanged( ang );
}
void CannonField::setForce( int newton )
{
if ( newton < 0 )
newton = 0;
if ( f == newton )
return;
f = newton;
emit forceChanged( f );
}
void CannonField::shoot()
{
if ( isShooting() )
return;
timerCount = 0;
shoot_ang = ang;
shoot_f = f;
autoShootTimer->start( 50 );
emit canShoot( FALSE );
}
void CannonField::newTarget()
{
static bool first_time = TRUE;
if ( first_time ) {
first_time = FALSE;
TQTime midnight( 0, 0, 0 );
srand( midnight.secsTo(TQTime::currentTime()) );
}
TQRegion r( targetRect() );
target = TQPoint( 200 + rand() % 190,
10 + rand() % 255 );
repaint( r.unite( targetRect() ) );
}
void CannonField::setGameOver()
{
if ( gameEnded )
return;
if ( isShooting() )
autoShootTimer->stop();
gameEnded = TRUE;
repaint();
}
void CannonField::restartGame()
{
if ( isShooting() )
autoShootTimer->stop();
gameEnded = FALSE;
repaint();
emit canShoot( TRUE );
}
void CannonField::moveShot()
{
TQRegion r( shotRect() );
timerCount++;
TQRect shotR = shotRect();
if ( shotR.intersects( targetRect() ) ) {
autoShootTimer->stop();
emit hit();
emit canShoot( TRUE );
} else if ( shotR.x() > width() || shotR.y() > height() ||
shotR.intersects(barrierRect()) ) {
autoShootTimer->stop();
emit missed();
emit canShoot( TRUE );
} else {
r = r.unite( TQRegion( shotR ) );
}
repaint( r );
}
void CannonField::mousePressEvent( TQMouseEvent *e )
{
if ( e->button() != LeftButton )
return;
if ( barrelHit( e->pos() ) )
barrelPressed = TRUE;
}
void CannonField::mouseMoveEvent( TQMouseEvent *e )
{
if ( !barrelPressed )
return;
TQPoint pnt = e->pos();
if ( pnt.x() <= 0 )
pnt.setX( 1 );
if ( pnt.y() >= height() )
pnt.setY( height() - 1 );
double rad = atan(((double)rect().bottom()-pnt.y())/pnt.x());
setAngle( tqRound ( rad*180/3.14159265 ) );
}
void CannonField::mouseReleaseEvent( TQMouseEvent *e )
{
if ( e->button() == LeftButton )
barrelPressed = FALSE;
}
void CannonField::paintEvent( TQPaintEvent *e )
{
TQRect updateR = e->rect();
TQPainter p( this );
if ( gameEnded ) {
p.setPen( black );
p.setFont( TQFont( "Courier", 48, TQFont::Bold ) );
p.drawText( rect(), AlignCenter, "Game Over" );
}
if ( updateR.intersects( cannonRect() ) )
paintCannon( &p );
if ( updateR.intersects( barrierRect() ) )
paintBarrier( &p );
if ( isShooting() && updateR.intersects( shotRect() ) )
paintShot( &p );
if ( !gameEnded && updateR.intersects( targetRect() ) )
paintTarget( &p );
}
void CannonField::paintShot( TQPainter *p )
{
p->setBrush( black );
p->setPen( NoPen );
p->drawRect( shotRect() );
}
void CannonField::paintTarget( TQPainter *p )
{
p->setBrush( red );
p->setPen( black );
p->drawRect( targetRect() );
}
void CannonField::paintBarrier( TQPainter *p )
{
p->setBrush( yellow );
p->setPen( black );
p->drawRect( barrierRect() );
}
const TQRect barrelRect(33, -4, 15, 8);
void CannonField::paintCannon( TQPainter *p )
{
TQRect cr = cannonRect();
TQPixmap pix( cr.size() );
pix.fill( this, cr.topLeft() );
TQPainter tmp( &pix );
tmp.setBrush( blue );
tmp.setPen( NoPen );
tmp.translate( 0, pix.height() - 1 );
tmp.drawPie( TQRect( -35,-35, 70, 70 ), 0, 90*16 );
tmp.rotate( -ang );
tmp.drawRect( barrelRect );
tmp.end();
p->drawPixmap( cr.topLeft(), pix );
}
TQRect CannonField::cannonRect() const
{
TQRect r( 0, 0, 50, 50 );
r.moveBottomLeft( rect().bottomLeft() );
return r;
}
TQRect CannonField::shotRect() const
{
const double gravity = 4;
double time = timerCount / 4.0;
double velocity = shoot_f;
double radians = shoot_ang*3.14159265/180;
double velx = velocity*cos( radians );
double vely = velocity*sin( radians );
double x0 = ( barrelRect.right() + 5 )*cos(radians);
double y0 = ( barrelRect.right() + 5 )*sin(radians);
double x = x0 + velx*time;
double y = y0 + vely*time - 0.5*gravity*time*time;
TQRect r = TQRect( 0, 0, 6, 6 );
r.moveCenter( TQPoint( tqRound(x), height() - 1 - tqRound(y) ) );
return r;
}
TQRect CannonField::targetRect() const
{
TQRect r( 0, 0, 20, 10 );
r.moveCenter( TQPoint(target.x(),height() - 1 - target.y()) );
return r;
}
TQRect CannonField::barrierRect() const
{
return TQRect( 145, height() - 100, 15, 100 );
}
bool CannonField::barrelHit( const TQPoint &p ) const
{
TQWMatrix mtx;
mtx.translate( 0, height() - 1 );
mtx.rotate( -ang );
mtx = mtx.invert();
return barrelRect.contains( mtx.map(p) );
}
bool CannonField::isShooting() const
{
return autoShootTimer->isActive();
}
TQSize CannonField::sizeHint() const
{
return TQSize( 400, 300 );
}
TQSizePolicy CannonField::sizePolicy() const
{
return TQSizePolicy( TQSizePolicy::Expanding, TQSizePolicy::Expanding );
}