Question

Is it possible to use LINQ to transform a flat array of doubles containing coordinate tuples (x, y),i.e. [x0,y0, …, xN, yN] to an array of half the length containing the same coordinates wrapped in a Point-class, i.e. [p0, …, pN]?

Preferably .NET 3.5, but also interrested in 4.0.

Answer 1

You can use .Batch from Jon Skeet’s morelinq:

IEnumerable<Point> points = coordinates.Batch(2,pair => new Point(pair.ElementAt(0), pair.ElementAt(1)));

In all honestly, the simplest solution is probably using a method (here with ints):

public IEnumerable<Point> GetPoints(int[] coordinates)
{
    for (int i = 0; i < coordinates.Length; i += 2)
    {
        yield return new Point(coordinates[i], coordinates[i + 1]);
    }
}