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- /****************************************************************
- **
- ** Implementation CannonField class, Qt tutorial 14
- **
- ****************************************************************/
-
- #include "cannon.h"
- #include <qtimer.h>
- #include <qpainter.h>
- #include <qpixmap.h>
- #include <qdatetime.h>
-
- #include <math.h>
- #include <stdlib.h>
-
-
- CannonField::CannonField( QWidget *parent, const char *name )
- : QWidget( parent, name )
- {
- ang = 45;
- f = 0;
- timerCount = 0;
- autoShootTimer = new QTimer( this, "movement handler" );
- connect( autoShootTimer, SIGNAL(timeout()),
- this, SLOT(moveShot()) );
- shoot_ang = 0;
- shoot_f = 0;
- target = QPoint( 0, 0 );
- gameEnded = FALSE;
- barrelPressed = FALSE;
- setPalette( QPalette( QColor( 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;
- QTime midnight( 0, 0, 0 );
- srand( midnight.secsTo(QTime::currentTime()) );
- }
- QRegion r( targetRect() );
- target = QPoint( 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()
- {
- QRegion r( shotRect() );
- timerCount++;
-
- QRect 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( QRegion( shotR ) );
- }
-
- repaint( r );
- }
-
-
- void CannonField::mousePressEvent( QMouseEvent *e )
- {
- if ( e->button() != LeftButton )
- return;
- if ( barrelHit( e->pos() ) )
- barrelPressed = TRUE;
- }
-
-
- void CannonField::mouseMoveEvent( QMouseEvent *e )
- {
- if ( !barrelPressed )
- return;
- QPoint 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( qRound ( rad*180/3.14159265 ) );
- }
-
-
- void CannonField::mouseReleaseEvent( QMouseEvent *e )
- {
- if ( e->button() == LeftButton )
- barrelPressed = FALSE;
- }
-
-
- void CannonField::paintEvent( QPaintEvent *e )
- {
- QRect updateR = e->rect();
- QPainter p( this );
-
- if ( gameEnded ) {
- p.setPen( black );
- p.setFont( QFont( "Courier", 48, QFont::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( QPainter *p )
- {
- p->setBrush( black );
- p->setPen( NoPen );
- p->drawRect( shotRect() );
- }
-
-
- void CannonField::paintTarget( QPainter *p )
- {
- p->setBrush( red );
- p->setPen( black );
- p->drawRect( targetRect() );
- }
-
- void CannonField::paintBarrier( QPainter *p )
- {
- p->setBrush( yellow );
- p->setPen( black );
- p->drawRect( barrierRect() );
- }
-
- const QRect barrelRect(33, -4, 15, 8);
-
- void CannonField::paintCannon( QPainter *p )
- {
- QRect cr = cannonRect();
- QPixmap pix( cr.size() );
- pix.fill( this, cr.topLeft() );
-
- QPainter tmp( &pix );
- tmp.setBrush( blue );
- tmp.setPen( NoPen );
-
- tmp.translate( 0, pix.height() - 1 );
- tmp.drawPie( QRect( -35,-35, 70, 70 ), 0, 90*16 );
- tmp.rotate( -ang );
- tmp.drawRect( barrelRect );
- tmp.end();
-
- p->drawPixmap( cr.topLeft(), pix );
- }
-
-
- QRect CannonField::cannonRect() const
- {
- QRect r( 0, 0, 50, 50 );
- r.moveBottomLeft( rect().bottomLeft() );
- return r;
- }
-
-
- QRect 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;
-
- QRect r = QRect( 0, 0, 6, 6 );
- r.moveCenter( QPoint( qRound(x), height() - 1 - qRound(y) ) );
- return r;
- }
-
-
- QRect CannonField::targetRect() const
- {
- QRect r( 0, 0, 20, 10 );
- r.moveCenter( QPoint(target.x(),height() - 1 - target.y()) );
- return r;
- }
-
-
- QRect CannonField::barrierRect() const
- {
- return QRect( 145, height() - 100, 15, 100 );
- }
-
-
- bool CannonField::barrelHit( const QPoint &p ) const
- {
- QWMatrix 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();
- }
-
-
- QSize CannonField::sizeHint() const
- {
- return QSize( 400, 300 );
- }
-
-
- QSizePolicy CannonField::sizePolicy() const
- {
- return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
- }
-