//A space to be divided futher
public Space(int _topLeftX, int _topLeftY, int _width, int _height)
{
spaceState = State.Empty;
sprite = null;
size = new Rect(_topLeftX, _topLeftY, _width, _height);
subSpaces = new List<Space>();
}
//A space that is being used for a sprite.
private Space(int _topLeftX, int _topLeftY, int _width, int _height, Sprite _sprite)
{
spaceState = State.Sprite;
sprite = _sprite;
size = new Rect(_topLeftX, _topLeftY, _width, _height);
subSpaces = new List<Space>();
}
//Add a sprite to the space.
//If the space isn't split then it is split and a space is made for the sprite.
//If the space is split then we check if the sprite will fit into one of the child spaces
public bool Add( Sprite _sprite )
{
switch (spaceState)
{
//if the space is not already split then try to split it up.
case State.Empty:
return Split(_sprite);
//If the space is already split then see if they is any room in the children spaces
case State.Split:
return subSpaces.OrderByDescending(space => space.size.Area)
.Any(s => s.Add(_sprite));
default:
return false;
}
}
private bool Split(Sprite _sprite)
{
//Can the sprite fit in the remaining space?
if (size.w >= _sprite.PaddedWidth() && size.h >= _sprite.PaddedHeight())
{
//Make a space for the sprite and insert it.
subSpaces.Add(new Space(size.x,
size.y,
_sprite.PaddedWidth(),
_sprite.PaddedHeight(),
_sprite));
//Carve up the remaining space so they can be used.
if ((size.w - _sprite.Width) > 0)
{
subSpaces.Add(new Space(size.x + _sprite.PaddedWidth(),
size.y ,
size.w - _sprite.PaddedWidth(),
size.h));
}
if ((size.h - _sprite.Height) > 0)
{
subSpaces.Add(new Space(size.x ,
size.y + _sprite.PaddedHeight(),
_sprite.PaddedWidth(),
size.h - _sprite.PaddedHeight()));
}
//We have successfully fitted the sprite and the space is split
spaceState = State.Split;
return true;
}
//Space was too small to be split.
spaceState = State.Empty;
return false;
}
