view.cpp

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

//                             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 );
	    }

	    int rockOffs = nrock->boundingRect().width()/4;
	    nrock->move( hit->x()+addx[i]*rockOffs, hit->y()+addy[i]*rockOffs, 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 )
	{
#ifndef QTOPIA_PHONE
	    int maxMissiles = mShootCount + 2;
#else
	    int maxMissiles = mShootCount + 1;
#endif
	    if ( !shootDelay && (int)missiles.count() < maxMissiles )
	    {
	      KMissile *missile = new KMissile( animation[ID_MISSILE], &field );
#ifdef QTOPIA_PHONE
	      missile->setExpiry(12);
#endif
	      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 );
	      emit missileFired();
	      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;
}