void BouncyLogo::advance(int stage)
{
switch ( stage ) {
case 0: {
double vx = xvel;
double vy = yvel;
if ( vx == 0.0 && vy == 0.0 ) {
// stopped last turn
initSpeed();
vx = xvel;
vy = yvel;
}
double nx = x() + vx;
double ny = y() + vy;
if ( nx < 0 || nx >= scene()->width() )
vx = -vx;
if ( ny < 0 || ny >= scene()->height() )
vy = -vy;
for (int bounce=0; bounce<4; bounce++) {
QList<QGraphicsItem *> l=scene()->collidingItems(this);
for (QList<QGraphicsItem *>::Iterator it=l.begin(); it!=l.end(); ++it) {
QGraphicsItem *hit = *it;
QPainterPath advancedShape = QMatrix().translate(xvel, yvel).map(shape());
if ( hit->type()==logo_rtti && hit->collidesWithPath(mapToItem(hit, advancedShape)) ) {
switch ( bounce ) {
case 0:
vx = -vx;
break;
case 1:
vy = -vy;
vx = -vx;
break;
case 2:
vx = -vx;
break;
case 3:
// Stop for this turn
vx = 0;
vy = 0;
break;
}
xvel = vx;
yvel = vy;
break;
}
}
}
if ( x()+vx < 0 || x()+vx >= scene()->width() )
vx = 0;
if ( y()+vy < 0 || y()+vy >= scene()->height() )
vy = 0;
xvel = vx;
yvel = vy;
} break;
case 1:
moveBy(xvel, yvel);
break;
}
}
