/// <summary>Expand the specified region with an additional cordon. This may expand the region outside the map borders.</summary>
public static CellRegion Expand(CellRegion region, int cordon)
{
var offset = new CVec(cordon, cordon);
var tl = Map.MapToCell(region.shape, Map.CellToMap(region.shape, region.TopLeft) - offset);
var br = Map.MapToCell(region.shape, Map.CellToMap(region.shape, region.BottomRight) + offset);
return(new CellRegion(region.shape, tl, br));
}
public CellRegion(TileShape shape, CPos topLeft, CPos bottomRight)
{
this.shape = shape;
TopLeft = topLeft;
BottomRight = bottomRight;
mapTopLeft = Map.CellToMap(shape, TopLeft);
mapBottomRight = Map.CellToMap(shape, BottomRight);
}
// Resolve an array index from cell coordinates
int Index(CPos cell)
{
var uv = Map.CellToMap(Shape, cell);
return(Index(uv.X, uv.Y));
}
public bool Contains(CPos cell)
{
var uv = Map.CellToMap(shape, cell);
return(uv.X >= mapTopLeft.X && uv.X <= mapBottomRight.X && uv.Y >= mapTopLeft.Y && uv.Y <= mapBottomRight.Y);
}
// Resolve an array index from cell coordinates
int Index(CPos cell)
{
var uv = Map.CellToMap(Shape, cell);
return(uv.Y * Size.Width + uv.X);
}