TT fixed a bug in QCanvasPixmapArray in 2.3.4 and qasteroids relied on the

buggy behaviour

1 files changed, 6 insertions, 6 deletions

diff --git a/noncore/games/qasteroids/view.cpp b/noncore/games/qasteroids/view.cpp
index ef08343..448a54a 100644
--- a/noncore/games/qasteroids/view.cpp
+++ b/noncore/games/qasteroids/view.cpp
@@ -1,884 +1,884 @@
 /**********************************************************************
 ** Copyright (C) 2000 Trolltech AS.  All rights reserved.
 **
 ** This file is part of Qtopia Environment.
 **
 ** This file may be distributed and/or modified under the terms of the
 ** GNU General Public License version 2 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ** See http://www.trolltech.com/gpl/ for GPL licensing information.
 **
 ** Contact info@trolltech.com if any conditions of this licensing are
 ** not clear to you.
 **
 **********************************************************************//*
  * KAsteroids - Copyright (c) Martin R. Jones 1997
  *
  * Part of the KDE project
  */
 
 #include "view.h"
 
 #include <qpe/resource.h>
 
 #include <qapplication.h>
 #include <qkeycode.h>
 #include <qaccel.h>
 
 #include <stdlib.h>
 #include <math.h>
 
 #define IMG_BACKGROUND "qasteroids/bg.png"
 
 #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  8
 #define MAX_BRAKES              5
 #define MAX_SHIELDS             5
         #define MAX_FIREPOWER   5
 
 #define TEXT_SPEED              4
 
 #define PI_X_2                  6.283185307
 #ifndef M_PI
 #define M_PI 3.141592654
 #endif
 
 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",         32 },
-    { ID_MISSILE,          "missile/missile.png",      1 },
+    { ID_MISSILE,          "missile/missile.png",      0 },
     { ID_BIT,              "bits/bits\%1.png",         16 },
-    { ID_EXHAUST,          "exhaust/exhaust.png",      1 },
-    { ID_ENERGY_POWERUP,   "powerups/energy.png",      1 },
+    { ID_EXHAUST,          "exhaust/exhaust.png",      0 },
+    { ID_ENERGY_POWERUP,   "powerups/energy.png",      0 },
 //    { 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_BRAKE_POWERUP,    "powerups/brake.png",       0 },
+    { ID_SHIELD_POWERUP,   "powerups/shield.png",      0 },
+    { ID_SHOOT_POWERUP,    "powerups/shoot.png",       0 },
     { ID_SHIELD,           "shield/shield\%1.png",      6 },
     { 0,                   0,                          0 }
 };
 
 
 
 KAsteroidsView::KAsteroidsView( QWidget *parent, const char *name )
     : QWidget( parent, name ),
       field(200, 200),
       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 );
 
     QPixmap pm( Resource::loadPixmap(IMG_BACKGROUND) );
     field.setBackgroundPixmap( pm );
 
     textSprite = new QCanvasText( &field );
     QFont font( "helvetica", 14 );
     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;
     can_destroy_powerups = FALSE;
 
     mPaused = TRUE;
 }
 
 // - - -
 
 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 = Resource::findPixmap( IMG_BACKGROUND );
     int sep = sprites_prefix.findRev( "/" );
 
     sprites_prefix.truncate( sep );
 
     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_MEDIUM], &field,
                              ID_ROCK_MEDIUM, randInt(2), randInt(2) ? -1 : 1 );
         double dx = (2.0 - randDouble()*4.0) * rockSpeed;
         double dy = (2.0 - randDouble()*4.0) * rockSpeed;
         rock->setVelocity( dx, dy );
         rock->setFrame( randInt( 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( AlignLeft | 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->visible() )
     {
         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>(randDouble()*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 - randDouble();
         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 - randDouble()*rockSpeed;
             if ( hit->rtti() == ID_ROCK_LARGE )
             {
                 nrock = new KRock( animation[ID_ROCK_MEDIUM], &field,
                                ID_ROCK_MEDIUM, randInt(2), randInt(2) ? -1 : 1 );
                 emit rockHit( 0 );
             }
             else
             {
                 nrock = new KRock( animation[ID_ROCK_SMALL], &field,
                                ID_ROCK_SMALL, randInt(2), randInt(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( randInt( 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 - randDouble()*4, y + 2 - randDouble()*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->visible() )
     {
         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() - 5, ship->y() - 5 );
 
             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 < 8; i++ )
                     {
                       bit = new KBit( animation[ID_BIT], &field );
                       bit->move( ship->x() + 5 - randDouble() * 10,
                                  ship->y() + 5 - randDouble() * 10,
                                  randInt(bit->frameCount()) );
                       bit->setVelocity( 1-randDouble()*2,
                                         1-randDouble()*2 );
                       bit->setDeath( 60 + randInt(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() + 10 - cosangle*11,
                                 ship->y() + 10 - sinangle*11,
                                 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/8;
             double thrusty = sinangle/8;
             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() + 10 - cosangle*10,
                         ship->y() + 10 - sinangle*10,
                         shipDx-cosangle, shipDy-sinangle, 3 );
         }
 
         ship->setFrame( shipAngle >> 1 );
 
         if ( shootShip )
         {
             if ( !shootDelay && (int)missiles.count() < mShootCount + 2 )
             {
               KMissile *missile = new KMissile( animation[ID_MISSILE], &field );
               missile->move( 11+ship->x()+cosangle*11,
                              11+ship->y()+sinangle*11, 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( ; it.current(); ++it )
         {
             pup = it.current();
             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 )
                 {
                     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;
                 }
                 else if ( (*it) == shield )
                 {
                     powerups.removeRef( pup );
                 }
                 else if ( (*it)->rtti() == ID_MISSILE )
                 {
                     if ( can_destroy_powerups )
                     {
                       powerups.removeRef( pup );
                     }
                 }
             }
         }
     }         // -- if( powerups.isEmpty() )
 }
 
 // - - -
 
 void KAsteroidsView::hideShield()
 {
     shield->hide();
     mShieldCount = 0;
     shieldOn = FALSE;
 }
 
 double KAsteroidsView::randDouble()
 {
     int v = rand();
     return (double)v / (double)RAND_MAX;
 }
 
 int KAsteroidsView::randInt( int range )
 {
     return rand() % range;
 }