sneak/Jumpy.Shared/Debug.cs

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System.Collections.Generic;

namespace Jumpy {
  // TODO: add a WriteLine sort of functionality.
  static class Debug {
    struct DebugRect {
      public Rectangle rect;
      public Color color;

      public DebugRect(Rectangle rect, Color color) {
        this.rect = rect;
        this.color = color;
      }
    }

    public static bool Enabled;
    static List<DebugRect> rects = new List<DebugRect>();
    static Texture2D whiteTexture;


    public static void Initialize(GraphicsDevice graphics) {
      whiteTexture = new Texture2D(graphics, 1, 1);
      whiteTexture.SetData(new Color[] { Color.White });
    }
    
    public static void Clear() {
      rects.Clear();
    }

    public static void AddRect(Rectangle rect, Color color) {
      rects.Add(new DebugRect(rect, color));
    }

    public static void Draw(SpriteBatch spriteBatch) {
      if (!Enabled) {
        return;
      }
      foreach (var debugRect in rects) {
        var rect = debugRect.rect;
        var color = debugRect.color;
        // top side
        spriteBatch.Draw(
          whiteTexture, new Rectangle(rect.Left, rect.Top, rect.Width, 1), color);
        // bottom side
        spriteBatch.Draw(
          whiteTexture, new Rectangle(rect.Left, rect.Bottom - 1, rect.Width, 1), color);
        // left side
        spriteBatch.Draw(
          whiteTexture, new Rectangle(rect.Left, rect.Top, 1, rect.Height), color);
        // right side
        spriteBatch.Draw(
          whiteTexture, new Rectangle(rect.Right - 1, rect.Top, 1, rect.Height), color);
      }
    }
  }
}