public static IEnumerable <Location> Inside
(this IEnumerable <Location> source, MapSize size)
{
return(source
.Where(location => location.IsInside(size)));
}
public Location AboveDiagonal(MapSize size)
{
return(IsAboveDiagonal(size) ? this : DiagonalMirror(size));
}
/// <summary>
/// Yields only indices that are lying inside of a triangle with
/// sides produced by lines: X = 0; Y = 0; X / size.X + Y / size.Y = 1
/// </summary>
public static IEnumerable <Location> InsideAndAboveDiagonal
(this IEnumerable <Location> source, MapSize size)
{
return(source
.Where(location => location.IsInside(size) && location.IsAboveDiagonal(size)));
}
public bool IsBelowDiagonal(MapSize size)
{
return(Y > size.Y - (float)X / size.X * size.Y - 1);
}
public bool IsOnDiagonal(MapSize size)
{
return(!IsAboveDiagonal(size) && !IsBelowDiagonal(size));
}
public bool IsAboveDiagonal(MapSize size)
{
return(Y < size.Y - (float)X / size.X * size.Y - 1);
}
public bool IsInside(MapSize size)
{
return(X >= 0 && X < size.X && Y >= 0 && Y < size.Y);
}
public Location DiagonalMirror(MapSize size)
{
return(IsOnDiagonal(size)
? X < size.X / 2 ? this : new Location(size.Y - Y - 1, size.X - X - 1)
: new Location(size.Y - Y - 1, size.X - X - 1));
}
public static Location Max(MapSize size)
{
return(new Location(size.Y - 1, size.X - 1));
}
/// <summary>
/// Yields only indices that are lying inside of a triangle with
/// sides produced by lines: X = 0; Y = 0; X / size.X + Y / size.Y = 1
/// </summary>
public static IEnumerable <SigmaIndex> Clamp(this IEnumerable <SigmaIndex> source, MapSize size)
{
return(source
.Where(index => index.IsInside(size) && index.IsAboveDiagonal(size)));
}
