/// <summary>
/// Creates a DefaultFOVVisibilityHandler that will manage visibility of objects for the given map as noted in the class description.
/// </summary>
/// <param name="map">The map this handler will manage visibility for.</param>
/// <param name="unexploredColor">Foreground color to set to all terrain tiles that are outside of FOV but have been explored.</param>
/// <param name="startingState">The starting state to put the handler in.</param>
public MagiRogueFOVVisibilityHandler(Map map, Color unexploredColor, int ghostLayer,
FovState startingState = FovState.Enabled) :
base(map, startingState)
{
ExploredColorTint = unexploredColor;
_ghostLayer = ghostLayer;
}
public static List <Point> TraceFov(Point point, int radius, TraceDelegate cb = null, object ctx = null)
{
FovState state = new FovState();
List <Point> visited = new List <Point>();
state.visited = visited;
state.originalCb = cb;
state.originalContext = ctx;
if (cb != null)
{
int res = cb(point, ctx);
if (res < 0)
{
return(visited);
}
}
visited.Add(point);
int n = radius * 24;
double dtheta = 2.0 * Math.PI / n;
for (int t = 0; t < n; t++)
{
double theta = t * dtheta;
int x = (int)Math.Round((radius * Math.Cos(theta)));
int y = (int)Math.Round((radius * Math.Sin(theta)));
Point end = new Point(point.X + x, point.Y + y);
TraceLine(point, end, FovCallback, state);
}
return(visited);
}
private static int FovCallback(Point point, object ctx)
{
FovState state = (FovState)ctx;
foreach (Point p in state.visited)
{
if (p.X == point.X && p.Y == point.Y)
{
return(0);
}
}
if (state.originalCb != null)
{
int res = state.originalCb(point, state.originalContext);
if (res < 0)
{
return(res);
}
}
state.visited.Add(point);
return(0);
}
