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Diffstat (limited to 'tutorial/t12/cannon.cpp')
| -rw-r--r-- | tutorial/t12/cannon.cpp | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/tutorial/t12/cannon.cpp b/tutorial/t12/cannon.cpp new file mode 100644 index 0000000..5303571 --- /dev/null +++ b/tutorial/t12/cannon.cpp @@ -0,0 +1,199 @@ +/**************************************************************** +** +** Implementation CannonField class, Qt tutorial 12 +** +****************************************************************/ + +#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 ); + 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 ( autoShootTimer->isActive() ) + return; + timerCount = 0; + shoot_ang = ang; + shoot_f = f; + autoShootTimer->start( 50 ); +} + + +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::moveShot() +{ + QRegion r( shotRect() ); + timerCount++; + + QRect shotR = shotRect(); + + if ( shotR.intersects( targetRect() ) ) { + autoShootTimer->stop(); + emit hit(); + } else if ( shotR.x() > width() || shotR.y() > height() ) { + autoShootTimer->stop(); + emit missed(); + } else { + r = r.unite( QRegion( shotR ) ); + } + + repaint( r ); +} + + +void CannonField::paintEvent( QPaintEvent *e ) +{ + QRect updateR = e->rect(); + QPainter p( this ); + + if ( updateR.intersects( cannonRect() ) ) + paintCannon( &p ); + if ( autoShootTimer->isActive() && + updateR.intersects( shotRect() ) ) + paintShot( &p ); + if ( 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() ); +} + + +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; +} + + +QSizePolicy CannonField::sizePolicy() const +{ + return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding ); +} |