/// <summary>
/// An internal function for comparing an object against the contents of a node.
/// </summary>
/// <param name="Iterator">An optional pointer to a linked list entry (for comparing A against itself).</param>
/// <returns>hether or not any overlaps were found.</returns>
protected bool overlapNode(FlxList Iterator)
{
//member list setup
bool c = false;
FlxObject co;
FlxList itr = Iterator;
if (itr == null)
{
if (_oa == A_LIST)
{
itr = _headA;
}
else
{
itr = _headB;
}
}
//Make sure this is a valid list to walk first!
if (itr.@object != null)
{
//Walk the list and check for overlaps
while (itr != null)
{
co = itr.@object;
if ((_o == co) || !co.exists || !_o.exists || !co.solid || !_o.solid ||
(_o.x + _o.width < co.x + FlxU.roundingError) ||
(_o.x + FlxU.roundingError > co.x + co.width) ||
(_o.y + _o.height < co.y + FlxU.roundingError) ||
(_o.y + FlxU.roundingError > co.y + co.height))
{
itr = itr.next;
continue;
}
if (_oc == null)
{
//_o.kill();
//co.kill();
c = true;
//_o.overlapped(co);
//co.overlapped(_o);
}
//else if(_oc(_o,co))
else if (_oc(this, new FlxSpriteCollisionEvent(_o, co)))
{
c = true;
//_o.overlapped(co);
//co.overlapped(_o);
}
itr = itr.next;
}
}
return(c);
}
/**
* Internal function for recursively adding objects to leaf lists.
*/
protected void addToList()
{
FlxList ot;
if (_oa == A_LIST)
{
if (_tailA.@object != null)
{
ot = _tailA;
_tailA = new FlxList();
ot.next = _tailA;
}
_tailA.@object = _o;
}
else
{
if (_tailB.@object != null)
{
ot = _tailB;
_tailB = new FlxList();
ot.next = _tailB;
}
_tailB.@object = _o;
}
if (!_canSubdivide)
{
return;
}
if (_nw != null)
{
_nw.addToList();
}
if (_ne != null)
{
_ne.addToList();
}
if (_se != null)
{
_se.addToList();
}
if (_sw != null)
{
_sw.addToList();
}
}
/// <summary>
/// Creates a new link, and sets object and next to null..
/// </summary>
public FlxList()
{
@object = null;
next = null;
}
/**
* Creates a new link, and sets <code>object</code> and <code>next</code> to <code>null</null>.
*/
public FlxList()
{
@object = null;
next = null;
}
/**
* Instantiate a new Quad Tree node.
*
* @param X The X-coordinate of the point in space.
* @param Y The Y-coordinate of the point in space.
* @param Width Desired width of this node.
* @param Height Desired height of this node.
* @param Parent The parent branch or node. Pass null to create a root.
*/
public FlxQuadTree(float X, float Y, float Width, float Height, FlxQuadTree Parent)
{
x = X;
y = Y;
width = Width;
height = Height;
//x = 0;
//y = 0;
//width = 0;
//height = 0;
_headA = _tailA = new FlxList();
_headB = _tailB = new FlxList();
/*DEBUG: draw a randomly colored rectangle indicating this quadrant (may induce seizures)
* var brush:FlxSprite = new FlxSprite().createGraphic(Width,Height,0xffffffff*FlxU.random());
* FlxState.screen.draw(brush,X+FlxG.scroll.x,Y+FlxG.scroll.y);//*/
//Copy the parent's children (if there are any)
if (Parent != null)
{
FlxList itr;
FlxList ot;
if (Parent._headA.@object != null)
{
itr = Parent._headA;
while (itr != null)
{
if (_tailA.@object != null)
{
ot = _tailA;
_tailA = new FlxList();
ot.next = _tailA;
}
_tailA.@object = itr.@object;
itr = itr.next;
}
}
if (Parent._headB.@object != null)
{
itr = Parent._headB;
while (itr != null)
{
if (_tailB.@object != null)
{
ot = _tailB;
_tailB = new FlxList();
ot.next = _tailB;
}
_tailB.@object = itr.@object;
itr = itr.next;
}
}
}
else
{
_min = (uint)(width + height) / (2 * divisions);
}
_canSubdivide = (width > _min) || (height > _min);
//Set up comparison/sort helpers
_nw = null;
_ne = null;
_se = null;
_sw = null;
_l = x;
_r = x + width;
_hw = width / 2;
_mx = _l + _hw;
_t = y;
_b = y + height;
_hh = height / 2;
_my = _t + _hh;
}
protected bool overlapNode(FlxList Iterator)
{
//member list setup
bool c = false;
FlxObject co;
FlxList itr = Iterator;
if(itr == null)
{
if(_oa == A_LIST)
itr = _headA;
else
itr = _headB;
}
//Make sure this is a valid list to walk first!
if(itr.@object != null)
{
//Walk the list and check for overlaps
while(itr != null)
{
co = itr.@object;
if( (_o == co) || !co.exists || !_o.exists || !co.solid || !_o.solid ||
(_o.x + _o.width < co.x + FlxU.roundingError) ||
(_o.x + FlxU.roundingError > co.x + co.width) ||
(_o.y + _o.height < co.y + FlxU.roundingError) ||
(_o.y + FlxU.roundingError > co.y + co.height) )
{
itr = itr.next;
continue;
}
if(_oc == null)
{
_o.kill();
co.kill();
c = true;
}
//else if(_oc(_o,co))
else if (_oc(this, new FlxSpriteCollisionEvent(_o, co)))
{
c = true;
}
itr = itr.next;
}
}
return c;
}
/**
* Internal function for recursively adding objects to leaf lists.
*/
protected void addToList()
{
FlxList ot;
if(_oa == A_LIST)
{
if(_tailA.@object != null)
{
ot = _tailA;
_tailA = new FlxList();
ot.next = _tailA;
}
_tailA.@object = _o;
}
else
{
if(_tailB.@object != null)
{
ot = _tailB;
_tailB = new FlxList();
ot.next = _tailB;
}
_tailB.@object = _o;
}
if(!_canSubdivide)
return;
if(_nw != null)
_nw.addToList();
if(_ne != null)
_ne.addToList();
if(_se != null)
_se.addToList();
if(_sw != null)
_sw.addToList();
}
/**
* Instantiate a new Quad Tree node.
*
* @param X The X-coordinate of the point in space.
* @param Y The Y-coordinate of the point in space.
* @param Width Desired width of this node.
* @param Height Desired height of this node.
* @param Parent The parent branch or node. Pass null to create a root.
*/
public FlxQuadTree(float X, float Y, float Width, float Height, FlxQuadTree Parent)
{
x = X;
y = Y;
width = Width;
height = Height;
//x = 0;
//y = 0;
//width = 0;
//height = 0;
_headA = _tailA = new FlxList();
_headB = _tailB = new FlxList();
/*DEBUG: draw a randomly colored rectangle indicating this quadrant (may induce seizures)
var brush:FlxSprite = new FlxSprite().createGraphic(Width,Height,0xffffffff*FlxU.random());
FlxState.screen.draw(brush,X+FlxG.scroll.x,Y+FlxG.scroll.y);//*/
//Copy the parent's children (if there are any)
if (Parent != null)
{
FlxList itr;
FlxList ot;
if (Parent._headA.@object != null)
{
itr = Parent._headA;
while (itr != null)
{
if (_tailA.@object != null)
{
ot = _tailA;
_tailA = new FlxList();
ot.next = _tailA;
}
_tailA.@object = itr.@object;
itr = itr.next;
}
}
if (Parent._headB.@object != null)
{
itr = Parent._headB;
while (itr != null)
{
if (_tailB.@object != null)
{
ot = _tailB;
_tailB = new FlxList();
ot.next = _tailB;
}
_tailB.@object = itr.@object;
itr = itr.next;
}
}
}
else
_min = (uint)(width + height) / (2 * divisions);
_canSubdivide = (width > _min) || (height > _min);
//Set up comparison/sort helpers
_nw = null;
_ne = null;
_se = null;
_sw = null;
_l = x;
_r = x + width;
_hw = width / 2;
_mx = _l + _hw;
_t = y;
_b = y + height;
_hh = height / 2;
_my = _t + _hh;
}