/**
* Checks wether this tile belongs to a given face.
*/
private static void ComputeFace(int x, int y, ref Graph.Graph graph)
{
// Check wether this tile is a wall, a vertex, or an empty cell.
Vector2 position = new Vector2(x, y);
Tile.Wall cellWall = graph.GetWallAt(position);
Graph.Vertex cellVtx = graph.GetVertexAt(position);
if (cellWall == null && cellVtx == null)
{
// Get the top and left cells.
Vector2 left = position + new Vector2(-1, 0);
Vector2 top = position + new Vector2(0, -1);
// Get the faces of the cells.
Graph.Face leftFace = graph.GetFaceFromPoint(left);
Graph.Face topFace = graph.GetFaceFromPoint(top);
Graph.Face pointFace;
// If both faces are null.
if (leftFace == null && topFace == null)
{
// Create a new face.
pointFace = new Graph.Face();
// Add the face to the graph.
graph.AddFace(pointFace);
// If both faces are different.
}
else if (leftFace != topFace)
{
{
// Merge both faces together.
pointFace = graph.MergeFaces(leftFace, topFace);
// If both faces are the same.
}
}
else
{
// Select it as the point's face.
pointFace = leftFace;
}
// Add the point to the face.
pointFace.AddPoint(position);
}
}