public List <MapCoordinate> FovFrom(IPositionSystem positionSystem, MapCoordinate mapCoordinate, int range, Func <Vector, bool> transparentTest = null)
{
var cachedFov = FovCache.TryGetCachedFov(mapCoordinate, range);
if (cachedFov != null)
{
return(cachedFov);
}
if (mapCoordinate.Key != MapKey)
{
return(new List <MapCoordinate>());
}
if (transparentTest == null)
{
transparentTest = (Vector v) =>
{
var entities = positionSystem.EntitiesAt(mapCoordinate + v);
var physicals = entities.Select(e => e.TryGet <Physical>()).Where(p => p != null);
return(!physicals.Any(p => p.Transparent == false));
};
}
var visibleVectors = ShadowcastingFovCalculator.InFov(range, transparentTest);
var visibleCells = visibleVectors.Select(v => mapCoordinate + v).ToList();
FovCache.Cache(mapCoordinate, range, visibleCells);
return(visibleCells);
}
public void Cache_SavesFov()
{
var coord = new MapCoordinate(MAP_KEY, 0, 0);
var fov = new List <MapCoordinate> {
coord
};
_fovCache.TryGetCachedFov(coord, 1).Should().BeNull();
_fovCache.Cache(coord, 1, fov);
_fovCache.TryGetCachedFov(coord, 1).Should().BeEquivalentTo(fov);
}