/**\brief Retrieves nearby QuadTrees
* \param c Coordinate
* \param r Radius
* \return std::list of QuadTree pointers.
*/
list<QuadTree*> SpriteManager::GetQuadrantsNear( Coordinate c, float r) {
// The possibleQuadrants are those trees adjacent and within a radius r
// Gather more trees when r is greater than the size of a quadrant
map<Coordinate,QuadTree*>::iterator iter;
list<QuadTree*> nearbyQuadrants;
set<Coordinate> possibleQuadrants;
Coordinate center = GetQuadrantCenter(c);
possibleQuadrants.insert( center );
float R = r;
do{
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(-R,-0)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(-0,+R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(+0,-R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(+R,+0)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(-R,-R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(-R,+R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(+R,-R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(+R,+R)));
R/=2;
} while(R>QUADRANTSIZE);
set<Coordinate>::iterator it;
for(it = possibleQuadrants.begin(); it != possibleQuadrants.end(); ++it) {
//here we're checking to see if this possible quadrant is one of the existing quadrants
// and if it is then we add its QuadTree to the vector we're returning
//how about we try creating the quadrant if it does not already exist
iter = trees.find(*it);
if(iter != trees.end() && iter->second->PossiblyNear(c,r)){
nearbyQuadrants.push_back(iter->second);
}
}
return nearbyQuadrants;
}
/**\brief Retrieves nearby QuadTrees
* \param c Coordinate
* \param r Radius
* \return std::list of QuadTree pointers.
*/
list<QuadTree*> SpriteManager::GetQuadrantsNear( Coordinate c, float r) {
// The possibleQuadrants are those trees adjacent and within a radius r
// Gather more trees when r is greater than the size of a quadrant
map<Coordinate,QuadTree*>::iterator iter;
list<QuadTree*> nearbyQuadrants;
set<Coordinate> possibleQuadrants;
possibleQuadrants.insert( GetQuadrantCenter(c));
float R = r;
do{
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(-R,-0)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(-0,+R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(+0,-R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(+R,+0)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(-R,-R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(-R,+R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(+R,-R)));
possibleQuadrants.insert( GetQuadrantCenter(c + Coordinate(+R,+R)));
R/=2;
} while(R>QUADRANTSIZE);
set<Coordinate>::iterator it;
for(it = possibleQuadrants.begin(); it != possibleQuadrants.end(); ++it) {
iter = trees.find(*it);
if(iter != trees.end() && iter->second->PossiblyNear(c,r)){
nearbyQuadrants.push_back(iter->second);
}
}
return nearbyQuadrants;
}
/**\brief Draws the current sprites
*/
void SpriteManager::Draw() {
if( OPTION(int,"options/development/debug-quadtree") )
GetQuadrant( Camera::Instance()->GetFocusCoordinate() )->Draw( GetQuadrantCenter( Camera::Instance()->GetFocusCoordinate() ) );
list<Sprite *>::iterator i;
list<Sprite*> *onscreen;
float r = (Video::GetHalfHeight() < Video::GetHalfWidth() ? Video::GetHalfWidth() : Video::GetHalfHeight()) *V_SQRT2;
onscreen = GetSpritesNear( Camera::Instance()->GetFocusCoordinate(), r, DRAW_ORDER_ALL);
onscreen->sort(compareSpritePtrs);
for( i = onscreen->begin(); i != onscreen->end(); ++i ) {
(*i)->Draw();
}
delete onscreen;
}
/**\brief Returns QuadTree at Coordinate
* \param point Coordinate
*/
QuadTree* SpriteManager::GetQuadrant( Coordinate point ) {
Coordinate treeCenter = GetQuadrantCenter(point);
// Check in the known Quadrant
map<Coordinate,QuadTree*>::iterator iter;
iter = trees.find( treeCenter );
if( iter != trees.end() ) {
return iter->second;
}
// Create the new Tree and attach it to the universe
QuadTree *newTree = new QuadTree(treeCenter, QUADRANTSIZE);
assert(treeCenter == newTree->GetCenter() );
assert(newTree->Contains(point));
trees.insert(make_pair(treeCenter, newTree));
AdjustBoundaries();
// Debug
//cout<<"A Tree at "<<treeCenter<<" was created to contain "<<point<<". "<<trees.size()<<" Quadrants exist now."<<endl;
return newTree;
}
/**\brief Retrieves nearby QuadTrees in a square band at <bandIndex> quadrants distant from the coordinate
* \param c Coordinate
* \param bandIndex number of quadrants distant from c
* \return std::list of QuadTree pointers.
*/
list<QuadTree*> SpriteManager::GetQuadrantsInBand ( Coordinate c, int bandIndex) {
// The possibleQuadrants here are the quadrants that are in the square band
// at distance bandIndex from the coordinate
// After we get the possible quadrants we prune them by making sure they exist
// (ie that something is in them)
list<QuadTree*> nearbyQuadrants;
set<Coordinate> possibleQuadrants;
//note that the QUADRANTSIZE define is the
// distance from the middle to the edge of a quadrant
//to get the square band of co-ordinates we have to
// - start at bottom left
// loop over increasing Y (to get 'west' line)
// loop over increasing X (to get 'south' line)
// - start at top right
// loop over decreasing Y (to get 'east' line)
// loop over decreasing X (to get 'north' line)
int edgeDistance = bandIndex * QUADRANTSIZE * 2; //number of pixels from middle to the band
Coordinate bottomLeft (c - Coordinate (edgeDistance, edgeDistance));
Coordinate topLeft (c + Coordinate (-edgeDistance, edgeDistance));
Coordinate topRight (c + Coordinate (edgeDistance, edgeDistance));
Coordinate bottomRight (c + Coordinate (edgeDistance, -edgeDistance));
//the 'full' length of one of the lines is (bandindex * 2) + 1
//we don't need the +1 as we deal with the corners individually, separately
int bandLength = (bandIndex * 2);
//deal with the un-included corners first
//we're using bottomLeft and topRight as the anchors,
// so topLeft and bottomRight are added here
possibleQuadrants.insert (GetQuadrantCenter (topLeft));
possibleQuadrants.insert (GetQuadrantCenter (bottomRight));
for (int i = 0; i < bandLength; i ++) {
int offset = ((QUADRANTSIZE * 2) * i);
Coordinate west, south, north, east;
west = GetQuadrantCenter (bottomLeft + Coordinate (0, offset));
south = GetQuadrantCenter (bottomLeft + Coordinate (offset, 0));
north = GetQuadrantCenter (topRight - Coordinate (offset, 0));
east = GetQuadrantCenter (topRight - Coordinate (0, offset));
possibleQuadrants.insert (west); //west
possibleQuadrants.insert (south); //south
possibleQuadrants.insert (north); //north
possibleQuadrants.insert (east); //east
}
//here we're checking to see if this possible quadrant is one of the existing quadrants
// and if it is then we add its QuadTree to the vector we're returning
// if it's not then there's nothing in it anyway so we don't care about it
set<Coordinate>::iterator it;
map<Coordinate,QuadTree*>::iterator iter;
for(it = possibleQuadrants.begin(); it != possibleQuadrants.end(); ++it) {
iter = trees.find(*it);
if(iter != trees.end()) {
nearbyQuadrants.push_back(iter->second);
}
}
return nearbyQuadrants;
}
/**\brief Draws the current sprites
*/
void SpriteManager::DrawQuadrantMap( Coordinate focus ) {
GetQuadrant( focus )->Draw( GetQuadrantCenter( focus ) );
}
/**\brief Draws the current sprites
*/
void SpriteManager::DrawQuadrantMap() {
GetQuadrant( Camera::Instance()->GetFocusCoordinate() )->Draw( GetQuadrantCenter( Camera::Instance()->GetFocusCoordinate() ) );
}
