public bool HasConnectionTo(GridAtom atom)
{
if (atom == null)
{
throw new ArgumentNullException(nameof(atom));
}
return
(LeftConnection == atom ||
RightConnection == atom ||
TopConnection == atom ||
BottomConnection == atom);
}
private void ConnectAtoms(GridAtom source, GridAtom target)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
if (source == target || source.Electrons <= 0 || target.Electrons <= 0)
{
return;
}
if (source.RightAtom == target && source.RightConnection == null)
{
source.Electrons--;
source.RightConnection = target;
target.Electrons--;
target.LeftConnection = source;
}
else if (source.LeftAtom == target && source.LeftConnection == null)
{
source.Electrons--;
source.LeftConnection = target;
target.Electrons--;
target.RightConnection = source;
}
else if (source.TopAtom == target && source.TopConnection == null)
{
source.Electrons--;
source.TopConnection = target;
target.Electrons--;
target.BottomConnection = source;
}
else if (source.BottomAtom == target && source.BottomConnection == null)
{
source.Electrons--;
source.BottomConnection = target;
target.Electrons--;
target.TopConnection = source;
}
}
/// <summary>
/// Tries to set the given atom to the given grid position.
/// </summary>
public bool SetAtom(int gridX, int gridY, Atom atom)
{
if (atom == null)
{
throw new ArgumentNullException(nameof(atom));
}
if (CanSet(gridX, gridY, atom))
{
_atoms[gridX, gridY] = new GridAtom(this, gridX, gridY, atom.Electrons);
AtomAdded(_atoms[gridX, gridY]);
return(true);
}
return(false);
}
/// <summary>
/// Checks if a molecule is complete (has no more electrons) and can be removed.
/// </summary>
private bool CheckMolecule(GridAtom startAtom)
{
if (startAtom.Electrons > 0)
{
return(false);
}
var moleculeAtoms = new HashSet <Point>();
var openList = new Stack <Point>();
var closedList = new HashSet <Point>();
openList.Push(startAtom.GridPos);
while (openList.Count > 0)
{
var currentPos = openList.Pop();
var currentAtom = GetAtom(currentPos.X, currentPos.Y);
if (currentAtom.Electrons > 0)
{
return(false);
}
closedList.Add(currentPos);
moleculeAtoms.Add(currentPos);
if (currentAtom.LeftConnection != null && !closedList.Contains(currentAtom.LeftConnection.GridPos))
{
openList.Push(currentAtom.LeftConnection.GridPos);
}
if (currentAtom.RightConnection != null && !closedList.Contains(currentAtom.RightConnection.GridPos))
{
openList.Push(currentAtom.RightConnection.GridPos);
}
if (currentAtom.TopConnection != null && !closedList.Contains(currentAtom.TopConnection.GridPos))
{
openList.Push(currentAtom.TopConnection.GridPos);
}
if (currentAtom.BottomConnection != null && !closedList.Contains(currentAtom.BottomConnection.GridPos))
{
openList.Push(currentAtom.BottomConnection.GridPos);
}
}
RemoveMoleculeAtoms(moleculeAtoms);
return(true);
}
private bool CanConnectTo(GridAtom target)
{
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
if (Electrons <= 0)
{
return(false);
}
if (target.Electrons <= 0)
{
return(false);
}
var differenceX = target.GridX - GridX;
var differenceY = target.GridY - GridY;
if (MathI.Abs(differenceX) + MathI.Abs(differenceY) != 1)
{
return(false);
}
if (differenceX == -1)
{
return(LeftConnection == null);
}
else if (differenceX == 1)
{
return(RightConnection == null);
}
else if (differenceY == -1)
{
return(TopConnection == null);
}
else if (differenceY == 1)
{
return(BottomConnection == null);
}
return(false);
}
private void RenderConnections(SpriteBatch batch, Vector2 pos, GridAtom atom, float layerDepth)
{
if (atom.LeftConnection != null)
{
batch.DrawTextureAtlasRegion(_grid.Contents.HConnection,
pos: new Vector2(
pos.X + atom.GridX * _grid.TileSize,
pos.Y + atom.GridY * _grid.TileSize + _grid.TileSize / 2),
layerDepth: layerDepth);
}
if (atom.TopConnection != null)
{
batch.DrawTextureAtlasRegion(_grid.Contents.VConnection,
pos: new Vector2(
pos.X + atom.GridX * _grid.TileSize + _grid.TileSize / 2,
pos.Y + atom.GridY * _grid.TileSize),
layerDepth: layerDepth);
}
}
private void AtomAdded(GridAtom addedAtom)
{
if (addedAtom == null)
{
throw new ArgumentNullException(nameof(addedAtom));
}
addedAtom.ConnectToNeighbours();
for (int gridX = addedAtom.GridX - 1; gridX < addedAtom.GridX + 1; gridX++)
{
for (int gridY = addedAtom.GridY - 1; gridY < addedAtom.GridY + 1; gridY++)
{
var atom = GetAtom(gridX, gridY);
if (atom != null && atom != addedAtom)
{
atom.ConnectToNeighbours();
}
}
}
CheckMolecule(addedAtom);
}
public void FromSaveGame(SaveGameGridData[,] gridData)
{
if (gridData == null)
{
throw new ArgumentNullException(nameof(gridData));
}
var width = gridData.GetLength(0);
var height = gridData.GetLength(1);
if (width != _width || height != _height)
{
throw new ArgumentException("Given grid data array has invalid dimensions.");
}
Clear();
for (int gridX = 0; gridX < width; gridX++)
{
for (int gridY = 0; gridY < height; gridY++)
{
var data = gridData[gridX, gridY];
if (data != null)
{
_atoms[gridX, gridY] = new GridAtom(this, gridX, gridY, data.Electrons);
}
}
}
for (int gridX = 0; gridX < width; gridX++)
{
for (int gridY = 0; gridY < height; gridY++)
{
var data = gridData[gridX, gridY];
if (data != null)
{
var atom = _atoms[gridX, gridY];
if (data.ConnectedLeft)
{
atom.LeftConnection = atom.LeftAtom;
atom.LeftAtom.RightConnection = atom;
}
if (data.ConnectedTop)
{
atom.TopConnection = atom.TopAtom;
atom.TopAtom.BottomConnection = atom;
}
if (data.ConnectedRight)
{
atom.RightConnection = atom.RightAtom;
atom.RightAtom.LeftConnection = atom;
}
if (data.ConnectedBottom)
{
atom.BottomConnection = atom.BottomAtom;
atom.BottomAtom.TopConnection = atom;
}
}
}
}
}