sneak/Shared/ExtensionMethods.cs

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using System.IO;

// All extension methods on built-in types (of C# or MonoGame) go in this file.
// Methods are ordered alphabetically by type name.

namespace SemiColinGames {
  public static class ExtensionMethods {
    // ContentManager
    public static string LoadString(this ContentManager content, string path) {
      string fullPath = Path.Combine(content.RootDirectory, path);
      return File.ReadAllText(fullPath);
    }

    // Point
    public static void Deconstruct(this Point point, out int x, out int y) =>
      (x, y) = (point.X, point.Y);

    // Rectangle
    public static Vector2 HalfSize(this Rectangle rect) {
      return new Vector2(rect.Width / 2, rect.Height / 2);
    }

    // SpriteFont
    public static Vector2 CenteredOn(this SpriteFont font, string text, Point position) {
      Vector2 size = font.MeasureString(text);
      return new Vector2(position.X - (int) size.X / 2, position.Y - (int) size.Y / 2);
    }

    // Vector2
    public static Vector2 Rotate(this Vector2 point, float angle) {
      float cos = FMath.Cos(angle);
      float sin = FMath.Sin(angle);
      return new Vector2(
        point.X * cos - point.Y * sin,
        point.Y * cos + point.X * sin);
    }
  }
}