Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegames@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 857 insertions, 0 deletions

diff --git a/kasteroids/view.cpp b/kasteroids/view.cpp
new file mode 100644
index 00000000..8ca358fd
--- /dev/null
+++ b/kasteroids/view.cpp
@@ -0,0 +1,857 @@
+/*
+ * KAsteroids - Copyright (c) Martin R. Jones 1997
+ *
+ * Part of the KDE project
+ */
+
+#include <stdlib.h>
+#include <math.h>
+#include <kapplication.h>
+#include <kstandarddirs.h>
+#include <kglobalsettings.h>
+
+#include "settings.h"
+#include "view.h"
+#include "view.moc"
+
+#define IMG_BACKGROUND "bg.png"
+#define SPRITES_PREFIX kapp->kde_datadir() + "/kasteroids/"
+
+#define REFRESH_DELAY           33
+#define SHIP_SPEED              0.3
+#define MISSILE_SPEED           10.0
+#define SHIP_STEPS              64
+#define ROTATE_RATE             2
+#define SHIELD_ON_COST          1
+#define SHIELD_HIT_COST         30
+#define BRAKE_ON_COST           4
+
+#define MAX_ROCK_SPEED          2.5
+#define MAX_POWERUP_SPEED       1.5
+#define MAX_SHIP_SPEED		12
+#define MAX_BRAKES              5
+#define MAX_SHIELDS             5
+#define MAX_FIREPOWER		5
+
+#define TEXT_SPEED              4
+
+#define PI_X_2                  6.283185307
+
+static struct
+{
+    int id;
+    const char *path;
+    int frames;
+}
+kas_animations [] =
+{
+    { ID_ROCK_LARGE,       "rock1/rock1%1.png",       32 },
+    { ID_ROCK_MEDIUM,      "rock2/rock2%1.png",       32 },
+    { ID_ROCK_SMALL,       "rock3/rock3%1.png",       32 },
+    { ID_SHIP,             "ship/ship%1.png",         64 },
+    { ID_MISSILE,          "missile/missile.png",      1 },
+    { ID_BIT,              "bits/bits%1.png",         16 },
+    { ID_EXHAUST,          "exhaust/exhaust.png",      1 },
+    { ID_ENERGY_POWERUP,   "powerups/energy.png",      1 },
+//    { ID_TELEPORT_POWERUP, "powerups/teleport%1.png", 12 },
+    { ID_BRAKE_POWERUP,    "powerups/brake.png",       1 },
+    { ID_SHIELD_POWERUP,   "powerups/shield.png",      1 },
+    { ID_SHOOT_POWERUP,    "powerups/shoot.png",       1 },
+    { ID_SHIELD,           "shield/shield%1.png",      6 },
+    { 0,                   0,                          0 }
+};
+
+
+
+KAsteroidsView::KAsteroidsView( QWidget *parent, const char *name )
+    : QWidget( parent, name ),
+      field(640, 440),
+      view(&field,this)
+{
+    view.setVScrollBarMode( QScrollView::AlwaysOff );
+    view.setHScrollBarMode( QScrollView::AlwaysOff );
+    rocks.setAutoDelete( true );
+    missiles.setAutoDelete( true );
+    bits.setAutoDelete( true );
+    powerups.setAutoDelete( true );
+    exhaust.setAutoDelete( true );
+
+    field.setBackgroundColor(black);
+    QPixmap pm( locate("sprite", IMG_BACKGROUND) );
+    field.setBackgroundPixmap( pm );
+
+    textSprite = new QCanvasText( &field );
+    QFont font( KGlobalSettings::generalFont().family(), 18 );
+    textSprite->setFont( font );
+
+    shield = 0;
+    shieldOn = false;
+    refreshRate = REFRESH_DELAY;
+
+    readSprites();
+
+    shieldTimer = new QTimer( this );
+    connect( shieldTimer, SIGNAL(timeout()), this, SLOT(hideShield()) );
+    mTimerId = -1;
+
+    shipPower = MAX_POWER_LEVEL;
+    vitalsChanged = true;
+    mBrakeCount = 0;
+    mShootCount = 0;
+    mShieldCount = 0;
+}
+
+// - - -
+
+KAsteroidsView::~KAsteroidsView()
+{
+}
+
+// - - -
+
+void KAsteroidsView::reset()
+{
+    rocks.clear();
+    missiles.clear();
+    bits.clear();
+    powerups.clear();
+    exhaust.clear();
+
+    shotsFired = 0;
+    shotsHit = 0;
+
+    rockSpeed = 1.0;
+    powerupSpeed = 1.0;
+    mFrameNum = 0;
+    mPaused = false;
+
+    ship->hide();
+    shield->hide();
+
+    if ( mTimerId >= 0 ) {
+	killTimer( mTimerId );
+	mTimerId = -1;
+    }
+}
+
+// - --
+
+void KAsteroidsView::newGame()
+{
+    if ( shieldOn )
+    {
+      shield->hide();
+      shieldOn = false;
+    }
+    reset();
+    if ( mTimerId < 0 )
+        mTimerId = startTimer( REFRESH_DELAY );
+    emit updateVitals();
+}
+
+// - - -
+
+void KAsteroidsView::endGame()
+{
+}
+
+void KAsteroidsView::pause( bool p )
+{
+    if ( !mPaused && p ) {
+	if ( mTimerId >= 0 ) {
+	    killTimer( mTimerId );
+	    mTimerId = -1;
+	}
+    } else if ( mPaused && !p )
+        mTimerId = startTimer( REFRESH_DELAY );
+    mPaused = p;
+}
+
+// - - -
+
+void KAsteroidsView::newShip()
+{
+    ship->move( field.width()/2, field.height()/2, 0 );
+    shield->move( field.width()/2, field.height()/2, 0 );
+    ship->setVelocity( 0.0, 0.0 );
+    shipDx = 0;
+    shipDy = 0;
+    shipAngle = 0;
+    rotateL = false;
+    rotateR = false;
+    thrustShip = false;
+    shootShip = false;
+    brakeShip = false;
+    teleportShip = false;
+    shieldOn = true;
+    shootDelay = 0;
+    shipPower = MAX_POWER_LEVEL;
+    rotateRate = ROTATE_RATE;
+    rotateSlow = 0;
+
+    mBrakeCount = 0;
+    mTeleportCount = 0;
+    mShootCount = 0;
+
+    ship->show();
+    shield->show();
+    mShieldCount = 1;   // just in case the ship appears on a rock.
+    shieldTimer->start( 1000, true );
+}
+
+void KAsteroidsView::setShield( bool s )
+{
+    if ( shieldTimer->isActive() && !s ) {
+        shieldTimer->stop();
+        hideShield();
+    } else {
+        shieldOn = s && mShieldCount;
+    }
+}
+
+void KAsteroidsView::brake( bool b )
+{
+    if ( mBrakeCount )
+    {
+        if ( brakeShip && !b )
+        {
+            rotateL = false;
+            rotateR = false;
+            thrustShip = false;
+            rotateRate = ROTATE_RATE;
+        }
+
+        brakeShip = b;
+    }
+}
+
+// - - -
+
+void KAsteroidsView::readSprites()
+{
+    QString sprites_prefix =
+        KGlobal::dirs()->findResourceDir("sprite", "rock1/rock10000.png");
+
+    int i = 0;
+    while ( kas_animations[i].id )
+    {
+        animation.insert( kas_animations[i].id,
+            new QCanvasPixmapArray( sprites_prefix + kas_animations[i].path,
+                                    kas_animations[i].frames ) );
+        i++;
+    }
+
+    ship = new QCanvasSprite( animation[ID_SHIP], &field );
+    ship->hide();
+
+    shield = new KShield( animation[ID_SHIELD], &field );
+    shield->hide();
+}
+
+// - - -
+
+void KAsteroidsView::addRocks( int num )
+{
+    for ( int i = 0; i < num; i++ )
+    {
+        KRock *rock = new KRock( animation[ID_ROCK_LARGE], &field,
+                                 ID_ROCK_LARGE, krandom.getLong(2),
+				 krandom.getLong(2) ? -1 : 1 );
+        double dx = (2.0 - krandom.getDouble()*4.0) * rockSpeed;
+        double dy = (2.0 - krandom.getDouble()*4.0) * rockSpeed;
+        rock->setVelocity( dx, dy );
+	rock->setFrame( krandom.getLong( rock->frameCount() ) );
+        if ( dx > 0 )
+        {
+            if ( dy > 0 )
+                rock->move( 5, 5, 0 );
+            else
+                rock->move( 5, field.height() - 25, 0 );
+        }
+        else
+        {
+            if ( dy > 0 )
+                rock->move( field.width() - 25, 5, 0 );
+            else
+                rock->move( field.width() - 25, field.height() - 25, 0 );
+        }
+        rock->show( );
+        rocks.append( rock );
+    }
+}
+
+// - - -
+
+void KAsteroidsView::showText( const QString &text, const QColor &color, bool scroll )
+{
+//    textSprite->setTextFlags( AlignHCenter | AlignVCenter );
+    textSprite->setText( text );
+    textSprite->setColor( color );
+
+    if ( scroll ) {
+	textSprite->move( (field.width()-textSprite->boundingRect().width()) / 2,
+			    -textSprite->boundingRect().height() );
+	textDy = TEXT_SPEED;
+    } else {
+	textSprite->move( (field.width()-textSprite->boundingRect().width()) / 2,
+			  (field.height()-textSprite->boundingRect().height()) / 2 );
+	textDy = 0;
+    }
+    textSprite->show();
+}
+
+// - - -
+
+void KAsteroidsView::hideText()
+{
+    textDy = -TEXT_SPEED;
+}
+
+// - - -
+
+void KAsteroidsView::resizeEvent(QResizeEvent* event)
+{
+    QWidget::resizeEvent(event);
+    field.resize(width()-4, height()-4);
+    view.resize(width(),height());
+}
+
+// - - -
+
+void KAsteroidsView::timerEvent( QTimerEvent * )
+{
+    field.advance();
+
+    QCanvasSprite *rock;
+
+    // move rocks forward
+    for ( rock = rocks.first(); rock; rock = rocks.next() ) {
+        ((KRock *)rock)->nextFrame();
+        wrapSprite( rock );
+    }
+
+    wrapSprite( ship );
+
+    // check for missile collision with rocks.
+    processMissiles();
+
+    // these are generated when a ship explodes
+    for ( KBit *bit = bits.first(); bit; bit = bits.next() )
+    {
+        if ( bit->expired() )
+        {
+            bits.removeRef( bit );
+        }
+        else
+        {
+            bit->growOlder();
+            bit->setFrame( ( bit->frame()+1 ) % bit->frameCount() );
+        }
+    }
+
+    for ( KExhaust *e = exhaust.first(); e; e = exhaust.next() )
+        exhaust.removeRef( e );
+
+    // move / rotate ship.
+    // check for collision with a rock.
+    processShip();
+
+    // move powerups and check for collision with player and missiles
+    processPowerups();
+
+    if ( textSprite->isVisible() )
+    {
+        if ( textDy < 0 &&
+	     textSprite->boundingRect().y() <= -textSprite->boundingRect().height() )
+            textSprite->hide();
+        else
+        {
+            textSprite->moveBy( 0, textDy );
+        }
+        if ( textSprite->boundingRect().y() > (field.height()-textSprite->boundingRect().height())/2 )
+            textDy = 0;
+    }
+
+    if ( vitalsChanged && !(mFrameNum % 10) ) {
+        emit updateVitals();
+        vitalsChanged = false;
+    }
+
+    mFrameNum++;
+}
+
+void KAsteroidsView::wrapSprite( QCanvasItem *s )
+{
+    int x = int(s->x() + s->boundingRect().width() / 2);
+    int y = int(s->y() + s->boundingRect().height() / 2);
+
+    if ( x > field.width() )
+        s->move( s->x() - field.width(), s->y() );
+    else if ( x < 0 )
+        s->move( field.width() + s->x(), s->y() );
+
+    if ( y > field.height() )
+        s->move( s->x(), s->y() - field.height() );
+    else if ( y < 0 )
+        s->move( s->x(), field.height() + s->y() );
+}
+
+// - - -
+
+void KAsteroidsView::rockHit( QCanvasItem *hit )
+{
+    KPowerup *nPup = 0;
+    int rnd = static_cast<int>(krandom.getDouble()*30.0) % 30;
+    switch( rnd )
+    {
+      case 4:
+      case 5:
+        nPup = new KPowerup( animation[ID_ENERGY_POWERUP], &field,
+                             ID_ENERGY_POWERUP );
+        break;
+      case 10:
+//        nPup = new KPowerup( animation[ID_TELEPORT_POWERUP], &field,
+//                             ID_TELEPORT_POWERUP );
+        break;
+      case 15:
+        nPup = new KPowerup( animation[ID_BRAKE_POWERUP], &field,
+                                  ID_BRAKE_POWERUP );
+        break;
+      case 20:
+        nPup = new KPowerup( animation[ID_SHIELD_POWERUP], &field,
+                                  ID_SHIELD_POWERUP );
+        break;
+      case 24:
+      case 25:
+        nPup = new KPowerup( animation[ID_SHOOT_POWERUP], &field,
+                                  ID_SHOOT_POWERUP );
+        break;
+    }
+    if ( nPup )
+    {
+        double r = 0.5 - krandom.getDouble();
+        nPup->move( hit->x(), hit->y(), 0 );
+        nPup->setVelocity( hit->xVelocity() + r, hit->yVelocity() + r );
+        nPup->show( );
+        powerups.append( nPup );
+    }
+
+    if ( hit->rtti() == ID_ROCK_LARGE || hit->rtti() == ID_ROCK_MEDIUM )
+    {
+        // break into smaller rocks
+        double addx[4] = { 1.0, 1.0, -1.0, -1.0 };
+        double addy[4] = { -1.0, 1.0, -1.0, 1.0 };
+
+        double dx = hit->xVelocity();
+        double dy = hit->yVelocity();
+
+	double maxRockSpeed = MAX_ROCK_SPEED * rockSpeed;
+        if ( dx > maxRockSpeed )
+            dx = maxRockSpeed;
+        else if ( dx < -maxRockSpeed )
+            dx = -maxRockSpeed;
+        if ( dy > maxRockSpeed )
+            dy = maxRockSpeed;
+        else if ( dy < -maxRockSpeed )
+            dy = -maxRockSpeed;
+
+        QCanvasSprite *nrock;
+
+        for ( int i = 0; i < 4; i++ )
+        {
+            double r = rockSpeed/2 - krandom.getDouble()*rockSpeed;
+            if ( hit->rtti() == ID_ROCK_LARGE )
+            {
+                nrock = new KRock( animation[ID_ROCK_MEDIUM], &field,
+                                   ID_ROCK_MEDIUM, krandom.getLong(2),
+				   krandom.getLong(2) ? -1 : 1 );
+                emit rockHit( 0 );
+            }
+            else
+            {
+                nrock = new KRock( animation[ID_ROCK_SMALL], &field,
+                                   ID_ROCK_SMALL, krandom.getLong(2),
+				   krandom.getLong(2) ? -1 : 1 );
+                emit rockHit( 1 );
+            }
+
+            nrock->move( hit->x(), hit->y(), 0 );
+            nrock->setVelocity( dx+addx[i]*rockSpeed+r, dy+addy[i]*rockSpeed+r );
+	    nrock->setFrame( krandom.getLong( nrock->frameCount() ) );
+            nrock->show( );
+            rocks.append( nrock );
+        }
+    }
+    else if ( hit->rtti() == ID_ROCK_SMALL )
+        emit rockHit( 2 );
+    rocks.removeRef( (QCanvasSprite *)hit );
+    if ( rocks.count() == 0 )
+        emit rocksRemoved();
+}
+
+void KAsteroidsView::reducePower( int val )
+{
+    shipPower -= val;
+    if ( shipPower <= 0 )
+    {
+        shipPower = 0;
+        thrustShip = false;
+        if ( shieldOn )
+        {
+            shieldOn = false;
+            shield->hide();
+        }
+    }
+    vitalsChanged = true;
+}
+
+void KAsteroidsView::addExhaust( double x, double y, double dx,
+                                 double dy, int count )
+{
+    for ( int i = 0; i < count; i++ )
+    {
+        KExhaust *e = new KExhaust( animation[ID_EXHAUST], &field );
+        e->move( x + 2 - krandom.getDouble()*4, y + 2 - krandom.getDouble()*4 );
+        e->setVelocity( dx, dy );
+        e->show( );
+        exhaust.append( e );
+    }
+}
+
+void KAsteroidsView::processMissiles()
+{
+    KMissile *missile;
+
+    // if a missile has hit a rock, remove missile and break rock into smaller
+    // rocks or remove completely.
+    QPtrListIterator<KMissile> it(missiles);
+
+    for ( ; it.current(); ++it )
+    {
+        missile = it.current();
+        missile->growOlder();
+
+        if ( missile->expired() )
+        {
+            missiles.removeRef( missile );
+            continue;
+        }
+
+        wrapSprite( missile );
+
+        QCanvasItemList hits = missile->collisions( true );
+        QCanvasItemList::Iterator hit;
+        for ( hit = hits.begin(); hit != hits.end(); ++hit )
+        {
+            if ( (*hit)->rtti() >= ID_ROCK_LARGE &&
+                 (*hit)->rtti() <= ID_ROCK_SMALL )
+            {
+                shotsHit++;
+                rockHit( *hit );
+                missiles.removeRef( missile );
+                break;
+            }
+        }
+    }
+}
+
+// - - -
+
+void KAsteroidsView::processShip()
+{
+    if ( ship->isVisible() )
+    {
+        if ( shieldOn )
+        {
+            shield->show();
+            reducePower( SHIELD_ON_COST );
+            static int sf = 0;
+            sf++;
+
+            if ( sf % 2 )
+                shield->setFrame( (shield->frame()+1) % shield->frameCount() );
+            shield->move( ship->x() - 9, ship->y() - 9 );
+
+            QCanvasItemList hits = shield->collisions( true );
+            QCanvasItemList::Iterator it;
+            for ( it = hits.begin(); it != hits.end(); ++it )
+            {
+                if ( (*it)->rtti() >= ID_ROCK_LARGE &&
+                     (*it)->rtti() <= ID_ROCK_SMALL )
+                {
+                    int factor;
+                    switch ( (*it)->rtti() )
+                    {
+                        case ID_ROCK_LARGE:
+                            factor = 3;
+                            break;
+
+                        case ID_ROCK_MEDIUM:
+                            factor = 2;
+                            break;
+
+                        default:
+                            factor = 1;
+                    }
+
+                    if ( factor > mShieldCount )
+                    {
+                        // shield not strong enough
+                        shieldOn = false;
+                        break;
+                    }
+                    rockHit( *it );
+                    // the more shields we have the less costly
+                    reducePower( factor * (SHIELD_HIT_COST - mShieldCount*2) );
+                }
+            }
+        }
+
+        if ( !shieldOn )
+        {
+            shield->hide();
+            QCanvasItemList hits = ship->collisions( true );
+            QCanvasItemList::Iterator it;
+            for ( it = hits.begin(); it != hits.end(); ++it )
+            {
+                if ( (*it)->rtti() >= ID_ROCK_LARGE &&
+                     (*it)->rtti() <= ID_ROCK_SMALL )
+                {
+                    KBit *bit;
+                    for ( int i = 0; i < 12; i++ )
+                    {
+                      bit = new KBit( animation[ID_BIT], &field );
+                      bit->move( ship->x() + 5 - krandom.getDouble() * 10,
+                                 ship->y() + 5 - krandom.getDouble() * 10,
+                                 krandom.getLong(bit->frameCount()) );
+                      bit->setVelocity( 1-krandom.getDouble()*2,
+                                        1-krandom.getDouble()*2 );
+                      bit->setDeath( 60 + krandom.getLong(60) );
+                      bit->show( );
+                      bits.append( bit );
+                    }
+                    ship->hide();
+                    shield->hide();
+                    emit shipKilled();
+                    break;
+                }
+            }
+        }
+
+
+        if ( rotateSlow )
+            rotateSlow--;
+
+        if ( rotateL )
+        {
+            shipAngle -= rotateSlow ? 1 : rotateRate;
+            if ( shipAngle < 0 )
+                shipAngle += SHIP_STEPS;
+        }
+
+        if ( rotateR )
+        {
+            shipAngle += rotateSlow ? 1 : rotateRate;
+            if ( shipAngle >= SHIP_STEPS )
+                shipAngle -= SHIP_STEPS;
+        }
+
+        double angle = shipAngle * PI_X_2 / SHIP_STEPS;
+        double cosangle = cos( angle );
+        double sinangle = sin( angle );
+
+        if ( brakeShip )
+        {
+            thrustShip = false;
+            rotateL = false;
+            rotateR = false;
+            rotateRate = ROTATE_RATE;
+            if ( fabs(shipDx) < 2.5 && fabs(shipDy) < 2.5 )
+            {
+                shipDx = 0.0;
+                shipDy = 0.0;
+                ship->setVelocity( shipDx, shipDy );
+                brakeShip = false;
+            }
+            else
+            {
+                double motionAngle = atan2( -shipDy, -shipDx );
+                if ( angle > M_PI )
+                    angle -= PI_X_2;
+                double angleDiff = angle - motionAngle;
+                if ( angleDiff > M_PI )
+                    angleDiff = PI_X_2 - angleDiff;
+                else if ( angleDiff < -M_PI )
+                    angleDiff = PI_X_2 + angleDiff;
+                double fdiff = fabs( angleDiff );
+                if ( fdiff > 0.08 )
+                {
+                    if ( angleDiff > 0 )
+                        rotateL = true;
+                    else if ( angleDiff < 0 )
+                        rotateR = true;
+                    if ( fdiff > 0.6 )
+                        rotateRate = mBrakeCount + 1;
+                    else if ( fdiff > 0.4 )
+                        rotateRate = 2;
+                    else
+                        rotateRate = 1;
+
+                    if ( rotateRate > 5 )
+                        rotateRate = 5;
+                }
+                else if ( fabs(shipDx) > 1 || fabs(shipDy) > 1 )
+                {
+                    thrustShip = true;
+                    // we'll make braking a bit faster
+                    shipDx += cosangle/6 * (mBrakeCount - 1);
+                    shipDy += sinangle/6 * (mBrakeCount - 1);
+                    reducePower( BRAKE_ON_COST );
+                    addExhaust( ship->x() + 20 - cosangle*22,
+                                ship->y() + 20 - sinangle*22,
+                                shipDx-cosangle, shipDy-sinangle,
+                                mBrakeCount+1 );
+                }
+            }
+        }
+
+        if ( thrustShip )
+        {
+	    // The ship has a terminal velocity, but trying to go faster
+	    // still uses fuel (can go faster diagonally - don't care).
+	    double thrustx = cosangle/4;
+	    double thrusty = sinangle/4;
+	    if ( fabs(shipDx + thrustx) < MAX_SHIP_SPEED )
+		shipDx += thrustx;
+	    if ( fabs(shipDy + thrusty) < MAX_SHIP_SPEED )
+		shipDy += thrusty;
+	    ship->setVelocity( shipDx, shipDy );
+            reducePower( 1 );
+            addExhaust( ship->x() + 20 - cosangle*20,
+                        ship->y() + 20 - sinangle*20,
+                        shipDx-cosangle, shipDy-sinangle, 3 );
+        }
+
+        ship->setFrame( shipAngle );
+
+        if ( shootShip )
+        {
+            if ( !shootDelay && (int)missiles.count() < mShootCount + 2 )
+            {
+              KMissile *missile = new KMissile( animation[ID_MISSILE], &field );
+              missile->move( 21+ship->x()+cosangle*10,
+                             21+ship->y()+sinangle*10, 0 );
+              missile->setVelocity( shipDx + cosangle*MISSILE_SPEED,
+                                    shipDy + sinangle*MISSILE_SPEED );
+              missile->show( );
+              missiles.append( missile );
+              shotsFired++;
+              reducePower( 1 );
+
+              shootDelay = 5;
+            }
+
+            if ( shootDelay )
+              shootDelay--;
+        }
+
+        if ( teleportShip )
+        {
+            int ra = rand() % 10;
+            if( ra == 0 )
+            ra += rand() % 20;
+            int xra = ra * 60 + ( (rand() % 20) * (rand() % 20) );
+            int yra = ra * 50 - ( (rand() % 20) * (rand() % 20) );
+            ship->move( xra, yra );
+        }
+
+        vitalsChanged = true;
+    }
+}
+
+// - - -
+
+void KAsteroidsView::processPowerups()
+{
+    if ( !powerups.isEmpty() )
+    {
+        // if player gets the powerup remove it from the screen, if option
+        // "Can destroy powerups" is enabled and a missile hits the powerup
+        // destroy it
+
+        KPowerup *pup;
+        QPtrListIterator<KPowerup> it( powerups );
+
+        for( ; (pup = it.current()); )
+        {
+            ++it; // We have to increase here, because pup may get deleted.
+            pup->growOlder();
+
+            if( pup->expired() )
+            {
+                powerups.removeRef( pup );
+                continue;
+            }
+
+            wrapSprite( pup );
+
+            QCanvasItemList hits = pup->collisions( true );
+            QCanvasItemList::Iterator it;
+            for ( it = hits.begin(); it != hits.end(); ++it )
+            {
+                if ( (*it) == ship || (*it) == shield )
+                {
+                    switch( pup->rtti() )
+                    {
+                      case ID_ENERGY_POWERUP:
+                        shipPower += 150;
+                        if ( shipPower > MAX_POWER_LEVEL )
+                            shipPower = MAX_POWER_LEVEL;
+                        break;
+                      case ID_TELEPORT_POWERUP:
+                        mTeleportCount++;
+                        break;
+                      case ID_BRAKE_POWERUP:
+                        if ( mBrakeCount < MAX_BRAKES )
+                            mBrakeCount++;
+                        break;
+                      case ID_SHIELD_POWERUP:
+                        if ( mShieldCount < MAX_SHIELDS )
+                            mShieldCount++;
+                        break;
+                      case ID_SHOOT_POWERUP:
+                        if ( mShootCount < MAX_FIREPOWER )
+                            mShootCount++;
+                        break;
+                    }
+
+                    powerups.removeRef( pup );
+                    vitalsChanged = true;
+                    break;
+                }
+
+                if ( (*it)->rtti() == ID_MISSILE )
+                {
+                    if ( Settings::canDestroyPowerups() )
+                    {
+                      powerups.removeRef( pup );
+                      break;
+                    }
+                }
+            }
+        }
+    }         // -- if( powerups.isEmpty() )
+}
+
+// - - -
+
+void KAsteroidsView::hideShield()
+{
+    shield->hide();
+    mShieldCount = 0;
+    shieldOn = false;
+}
+
+
+// - - -
+