view.cpp Example File
graphicsview/portedasteroids/view.cpp
}
void KAsteroidsView::newGame()
{
if ( !initialized )
return;
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 ( !initialized )
return;
if ( !mPaused && p ) {
if ( mTimerId >= 0 ) {
killTimer( mTimerId );
mTimerId = -1;
}
} else if ( mPaused && !p )
mTimerId = startTimer( REFRESH_DELAY );
mPaused = p;
}
void KAsteroidsView::newShip()
{
if ( !initialized )
return;
ship->setPos( width()/2, height()/2 );
ship->setFrame( 0 );
shield->setPos( width()/2, height()/2 );
shield->setFrame( 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;
shieldTimer->start( 1000, TRUE );
}
void KAsteroidsView::setShield( bool s )
{
if ( !initialized )
return;
if ( shieldTimer->isActive() && !s ) {
shieldTimer->stop();
hideShield();
} else {
shieldOn = s && mShieldCount;
}
}
void KAsteroidsView::brake( bool b )
{
if ( !initialized )
return;
if ( mBrakeCount )
{
if ( brakeShip && !b )
{
rotateL = FALSE;
rotateR = FALSE;
thrustShip = FALSE;
rotateRate = ROTATE_RATE;
}
brakeShip = b;
}
}
bool KAsteroidsView::readSprites()
{
QString sprites_prefix = ":/trolltech/examples/graphicsview/portedasteroids/sprites/";
int i = 0;
while ( kas_animations[i].id )
{
QList<QPixmap> anim;
QString wildcard = sprites_prefix + kas_animations[i].path;
wildcard.replace("%1", "*");
QFileInfo fi(wildcard);
foreach (QString entry, QDir(fi.path(), fi.fileName()).entryList())
anim << QPixmap(fi.path() + "/" + entry);
animation.insert( kas_animations[i].id, anim );
i++;
}
ship = new AnimatedPixmapItem( animation[ID_SHIP], &field );
ship->hide();
shield = new KShield( animation[ID_SHIELD], &field );
shield->hide();
return (!ship->image(0).isNull() && !shield->image(0).isNull());
}
void KAsteroidsView::addRocks( int num )
{
if ( !initialized )
return;
for ( int i = 0; i < num; i++ )
{
KRock *rock = new KRock( animation[ID_ROCK_LARGE], &field,
ID_ROCK_LARGE, 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->setPos( 5, 5 );
else
rock->setPos( 5, field.height() - 25 );
rock->setFrame( 0 );
}
else
{
if ( dy > 0 )
rock->setPos( field.width() - 25, 5 );
else
rock->setPos( field.width() - 25, field.height() - 25 );
rock->setFrame( 0 );
}
rock->show();
rocks.append( rock );
}
}
void KAsteroidsView::showText( const QString &text, const QColor &color, bool scroll )
{
if ( !initialized )
return;
textSprite->setHtml( QString("<font color=#%1%2%3>%4</font>")
.arg(color.red(), 2, 16, QLatin1Char('0'))
.arg(color.green(), 2, 16, QLatin1Char('0'))
.arg(color.blue(), 2, 16, QLatin1Char('0'))
.arg(text) );
Q_UNUSED(color);
if ( scroll ) {
textSprite->setPos( (field.width()-textSprite->boundingRect().width()) / 2,
-textSprite->boundingRect().height() );
textDy = TEXT_SPEED;
} else {
textSprite->setPos( (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.setSceneRect(0, 0, width()-4, height()-4);
view.resize(width(),height());
}
void KAsteroidsView::timerEvent( QTimerEvent * )
{
field.advance();
AnimatedPixmapItem *rock;
for ( rock = rocks.first(); rock; rock = rocks.next() ) {
((KRock *)rock)->nextFrame();
wrapSprite( rock );
}
wrapSprite( ship );
processMissiles();
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 );
processShip();
processPowerups();
if ( textSprite->isVisible() )
{
if ( textDy < 0 &&
textSprite->boundingRect().y() <= -textSprite->boundingRect().height() ) {
textSprite->hide();
} else {
textSprite->moveBy( 0, textDy );
}
if ( textSprite->sceneBoundingRect().y() > (field.height()-textSprite->boundingRect().height())/2 )
textDy = 0;
}
if ( vitalsChanged && !(mFrameNum % 10) ) {
emit updateVitals();
vitalsChanged = FALSE;
}
mFrameNum++;
}
void KAsteroidsView::wrapSprite( QGraphicsItem *s )
{
int x = int(s->x() + s->boundingRect().width() / 2);
int y = int(s->y() + s->boundingRect().height() / 2);
if ( x > field.width() )
s->setPos( s->x() - field.width(), s->y() );
else if ( x < 0 )
s->setPos( field.width() + s->x(), s->y() );
if ( y > field.height() )
s->setPos( s->x(), s->y() - field.height() );
else if ( y < 0 )
s->setPos( s->x(), field.height() + s->y() );
}
void KAsteroidsView::rockHit( AnimatedPixmapItem *hit )
{
KPowerup *nPup = 0;
int rnd = 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:
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->setPos( hit->x(), hit->y() );
nPup->setFrame( 0 );
nPup->setVelocity( hit->xVelocity() + r, hit->yVelocity() + r );
powerups.append( nPup );
}
if ( hit->type() == ID_ROCK_LARGE || hit->type() == ID_ROCK_MEDIUM )
{
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;
AnimatedPixmapItem *nrock;
for ( int i = 0; i < 4; i++ )
{
double r = rockSpeed/2 - randDouble()*rockSpeed;
if ( hit->type() == 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->setPos( hit->x(), hit->y() );
nrock->setFrame( 0 );
nrock->setVelocity( dx+addx[i]*rockSpeed+r, dy+addy[i]*rockSpeed+r );
nrock->setFrame( randInt( nrock->frameCount() ) );
rocks.append( nrock );
}
}
else if ( hit->type() == ID_ROCK_SMALL )
emit rockHit( 2 );
rocks.removeRef( 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->setPos( x + 2 - randDouble()*4, y + 2 - randDouble()*4 );
e->setVelocity( dx, dy );
exhaust.append( e );
}
}
void KAsteroidsView::processMissiles()
{
KMissile *missile;
Q3PtrListIterator<KMissile> it(missiles);
for ( ; it.current(); ++it )
{
missile = it.current();
missile->growOlder();
if ( missile->expired() )
{
missiles.removeRef( missile );
continue;
}
wrapSprite( missile );
QList<QGraphicsItem *> hits = missile->collidingItems();
QList<QGraphicsItem *>::Iterator hit;
for ( hit = hits.begin(); hit != hits.end(); ++hit )
{
if ( (*hit)->type() >= ID_ROCK_LARGE &&
(*hit)->type() <= ID_ROCK_SMALL )
{
shotsHit++;
rockHit( static_cast<AnimatedPixmapItem *>(*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->setPos( ship->x() - 9, ship->y() - 9 );
QList<QGraphicsItem *> hits = shield->collidingItems();
QList<QGraphicsItem *>::Iterator it;
for ( it = hits.begin(); it != hits.end(); ++it )
{
if ( (*it)->type() >= ID_ROCK_LARGE &&
(*it)->type() <= ID_ROCK_SMALL )
{
int factor;
switch ( (*it)->type() )
{
case ID_ROCK_LARGE:
factor = 3;
break;
case ID_ROCK_MEDIUM:
factor = 2;
break;
default:
factor = 1;
}
if ( factor > mShieldCount )
{
shieldOn = FALSE;
break;
}
rockHit( static_cast<AnimatedPixmapItem *>(*it) );
reducePower( factor * (SHIELD_HIT_COST - mShieldCount*2) );
}
}
}
if ( !shieldOn )
{
shield->hide();
QList<QGraphicsItem *> hits = ship->collidingItems();
QList<QGraphicsItem *>::Iterator it;
for ( it = hits.begin(); it != hits.end(); ++it )
{
if ( (*it)->type() >= ID_ROCK_LARGE &&
(*it)->type() <= ID_ROCK_SMALL )
{
KBit *bit;
for ( int i = 0; i < 12; i++ )
{
bit = new KBit( animation[ID_BIT], &field );
bit->setPos( ship->x() + 5 - randDouble() * 10,
ship->y() + 5 - randDouble() * 10 );
bit->setFrame( randInt(bit->frameCount()) );
bit->setVelocity( 1-randDouble()*2,
1-randDouble()*2 );
bit->setDeath( 60 + randInt(60) );
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;
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 )
{
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 >> 1 );
if ( shootShip )
{
if ( !shootDelay && (int)missiles.count() < mShootCount + 2 )
{
KMissile *missile = new KMissile( animation[ID_MISSILE], &field );
missile->setPos( 21+ship->x()+cosangle*21,
21+ship->y()+sinangle*21 );
missile->setFrame( 0 );
missile->setVelocity( shipDx + cosangle*MISSILE_SPEED,
shipDy + sinangle*MISSILE_SPEED );
missiles.append( missile );
shotsFired++;
reducePower( 1 );
shootDelay = 5;
}
if ( shootDelay )
shootDelay--;
}
if ( teleportShip )
{
int ra = qrand() % 10;
if( ra == 0 )
ra += qrand() % 20;
int xra = ra * 60 + ( (qrand() % 20) * (qrand() % 20) );
int yra = ra * 50 - ( (qrand() % 20) * (qrand() % 20) );
ship->setPos( xra, yra );
}
vitalsChanged = TRUE;
}
}
void KAsteroidsView::processPowerups()
{
if ( !powerups.isEmpty() )
{
KPowerup *pup;
Q3PtrListIterator<KPowerup> it( powerups );
for( ; it.current(); ++it )
{
pup = it.current();
pup->growOlder();
if( pup->expired() )
{
powerups.removeRef( pup );
continue;
}
wrapSprite( pup );
QList<QGraphicsItem *> hits = pup->collidingItems();
QList<QGraphicsItem *>::Iterator it;
for ( it = hits.begin(); it != hits.end(); ++it )
{
if ( (*it) == ship )
{
switch( pup->type() )
{
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)->type() == ID_MISSILE )
{
if ( can_destroy_powerups )
{
powerups.removeRef( pup );
}
}
}
}
}
}
void KAsteroidsView::hideShield()
{
shield->hide();
mShieldCount = 0;
shieldOn = FALSE;
}
double KAsteroidsView::randDouble()
{
int v = qrand();
return (double)v / (double)RAND_MAX;
}
int KAsteroidsView::randInt( int range )
{
return qrand() % range;
}
void KAsteroidsView::showEvent( QShowEvent *e )
{
#if defined( QT_LICENSE_PROFESSIONAL )
static bool wasThere = FALSE;
if ( !wasThere ) {
wasThere = TRUE;
QMessageBox::information( this, tr("QCanvas demo"),
tr("This game has been implemented using the QCanvas class.\n"
"The QCanvas class is not part of the Professional Edition. Please \n"
"contact Trolltech if you want to upgrade to the Enterprise Edition.") );
}
#endif
QWidget::showEvent( e );
}