Question

in my program I have following code:

 private void SetCorners<T>(T position, int width, int height)
    {
        float halfWidth = width / 2 + position.X;
        float halfHeight = height / 2 + position.Y;

        UpperLeft = new Vector2(-halfWidth, -halfHeight);
        UpperRight = new Vector2(halfWidth, -halfHeight);
        LowerLeft = new Vector2(-halfWidth, halfHeight);
        LowerRight = new Vector2(halfWidth, halfHeight);
    }

In which T is either Vector2 or Vector3 from Microsoft.Xna.Framework. This code does not build because T does not contains definition of them.How to make this method works?

Answer 1

You could also create a wrapper class for the two structs:

private void SetCorners<T>(T position, int width, int height)
    where T : MyVectorWrapper
{
    float halfWidth = width / 2 + position.X;
    float halfHeight = height / 2 + position.Y;

    UpperLeft = new Vector2(-halfWidth, -halfHeight);
    UpperRight = new Vector2(halfWidth, -halfHeight);
    LowerLeft = new Vector2(-halfWidth, halfHeight);
    LowerRight = new Vector2(halfWidth, halfHeight);
}

class MyVectorWrapper
{
    public float X { get; set; }
    public float Y { get; set; }

    public MyVectorWrapper(dynamic vector2)
    {
        X = vector2.X;
        Y = vector2.Y;
    }
}

Sample usage:

var v2 = new Vector2(1, 2);
var v3 = new Vector3(v2, 3);
SetCorners<MyVectorWrapper>(new MyVectorWrapper(v2), width, height);
SetCorners<MyVectorWrapper>(new MyVectorWrapper(v3), width, height);