public static void FloodFill(PlatformContext context, Point location, TilePlacement placement)
{
if (!FloodFillValid(context, location, placement))
{
return;
}
var queue = new Queue <Point>();
var set = new HashSet <Point>();
queue.Enqueue(location);
set.Add(location);
while (queue.Any())
{
var point = queue.Dequeue();
placement.Stamp(context, context.TileToWorld(point));
foreach (var test in FloodFillTestPoints)
{
var next = point + test;
if (!set.Contains(next) && FloodFillValid(context, next, placement))
{
queue.Enqueue(next);
set.Add(next);
}
}
}
}
private static bool FloodFillValid(PlatformContext context, Point location, TilePlacement placement)
{
if (!context.IsInBounds(location))
{
return(false);
}
var cell = context.Map[location];
switch (placement.Layer)
{
case TileStencil.Layer.Background:
return(!cell.Background.Any());
case TileStencil.Layer.Foreground:
return(!cell.Foreground.Any());
case TileStencil.Layer.Blocking:
return(cell.Block == null);
}
return(true);
}
