/**\brief SpriteManager update function.
*/
void SpriteManager::Update() {
// Update the sprites inside each quadrant
// TODO: Update only the sprites that are in nearby Quadrants
list<Sprite *> all_oob;
list<QuadTree*> nearby = GetQuadrantsNear( Camera::Instance()->GetFocusCoordinate(), QUADRANTSIZE*4 );
list<QuadTree*>::iterator iter;
for ( iter = nearby.begin(); iter != nearby.end(); ++iter ) {
(*iter)->Update();
list<Sprite *>* oob = (*iter)->FixOutOfBounds();
all_oob.splice(all_oob.end(), *oob );
delete oob;
}
// Move sprites to adjacent Quadrants as they cross boundaries
list<Sprite *>::iterator i;
for( i = all_oob.begin(); i != all_oob.end(); ++i ) {
GetQuadrant( (*i)->GetWorldPosition() )->Insert( *i );
}
//Delete all sprites queued to be deleted
if (!spritesToDelete.empty()) {
spritesToDelete.unique();
for( i = spritesToDelete.begin(); i != spritesToDelete.end(); ++i ) {
DeleteSprite(*i);
}
spritesToDelete.clear();
}
for ( iter = nearby.begin(); iter != nearby.end(); ++iter ) {
(*iter)->ReBallance();
}
DeleteEmptyQuadrants();
}
/**\brief Returns a list of sprites that are near coordinate.
* \param c Coordinate
* \param r Radius
* \return std::list of Sprite pointers.
*/
list<Sprite*> *SpriteManager::GetSpritesNear(Coordinate c, float r, int type) {
list<Sprite*> *sprites = new list<Sprite*>();
// Search the possible quadrants
list<QuadTree*> nearbyQuadrants = GetQuadrantsNear(c,r);
list<QuadTree*>::iterator it;
for(it = nearbyQuadrants.begin(); it != nearbyQuadrants.end(); ++it) {
list<Sprite *>* nearby = new list<Sprite*>;
(*it)->GetSpritesNear(c,r,nearby,type);
sprites->splice(sprites->end(), *nearby);
delete nearby;
}
// Sort sprites by their distance from the coordinate c
sprites->sort(compareSpriteDistFromPoint(c));
return( sprites );
}
/**\brief Get a Sprite nearest to another Sprite.
* \details Rather than just accept a Coordinate, this requires another Sprite
* because the common usage is to look for a nearby enemy or
* collision. Since a Sprite is by definition the closest thing to
* its own position, this function needs to know what sprite to ignore.
*
* The Usual use for this is to find the nearest sprite of a certain type.
\verbatim
Sprite* found = GetNearestSprite(mySprite, 1000, DRAW_ORDER_SHIP);
\endverbatim
*
* Rather than re-implement this code for when the caller truely
* doesn't care about a Sprite, the caller can supply a dummy Sprite like:
\verbatim
Sprite* found = GetNearestSprite(Effect( Coordinate(0,0),"",0), 1000);
\endverbatim
*
* \todo Build the Dummy example above into the SpriteManager.
*
*/
Sprite* SpriteManager::GetNearestSprite(Sprite* obj, float r, int type) {
float tmpdist;
Sprite* closest=NULL;
Sprite* possible=NULL;
if(obj==NULL)
return (Sprite*)NULL;
list<QuadTree*> nearbyQuadrants = GetQuadrantsNear(obj->GetWorldPosition(),r);
list<QuadTree*>::iterator it;
for(it = nearbyQuadrants.begin(); it != nearbyQuadrants.end(); ++it) {
possible = (*it)->GetNearestSprite(obj,r, type);
if(possible!=NULL) {
tmpdist = (obj->GetWorldPosition()-possible->GetWorldPosition()).GetMagnitude();
if(tmpdist<r) {
r = tmpdist;
closest = possible;
}
}
}
return closest;
}
