FPS Drawable Game Component

A simple game component for rendering the 'frames per second' of the game.

public class FPSDisplay : DrawableGameComponent
{
	private SpriteBatch spriteBatch;
	private SpriteFont videoFont;
	private float elapsedTime;
	private float totalFrames;
	private float fps;
	private string fontName;
	private Color textColor = Color.Red;
 
	public string FontName
	{
		get { return fontName; }
		set
		{
			if (string.IsNullOrEmpty(value))
				return;
 
			fontName = value;
			if (spriteBatch != null)
				videoFont = Game.Content.Load<SpriteFont>(fontName);
		}
	}
 
	public Color Color
	{
		get { return textColor; }
		set { textColor = value; }
	}
 
 
	public FPSDisplay(Game game)
		: base(game)
	{
	}
 
	public FPSDisplay(Game game, bool show)
		: base(game)
	{
		Visible = show;
	}
 
	public FPSDisplay(Game game, string fontName)
		: base(game)
	{
		this.fontName = fontName;
	}
 
	public FPSDisplay(Game game, string fontName, bool show)
		: base(game)
	{
		this.fontName = fontName;
		Visible = show;
	}
 
	protected override void LoadContent()
	{
		// Create a new SpriteBatch, which can be used to draw textures.
		spriteBatch = new SpriteBatch(Game.GraphicsDevice);
 
		// Load the font if fontName has been set.
		if (!string.IsNullOrEmpty(fontName))
			videoFont = Game.Content.Load<SpriteFont>(fontName);
	}
 
	public override void Update(GameTime gameTime)
	{
		elapsedTime += (float)gameTime.ElapsedGameTime.TotalSeconds;
		totalFrames++;
 
		if (elapsedTime >= 1.0f)
		{
			fps = totalFrames;
			totalFrames = 0;
			elapsedTime = 0;
		}
	}
 
	public override void Draw(GameTime gameTime)
	{
		if (fontName.Length > 0)
		{
			spriteBatch.Begin();
			spriteBatch.DrawString(
				videoFont,
				"FPS=" + fps,
				new Vector2(videoFont.LineSpacing),
				textColor,
				0f,
				Vector2.Zero,
				1f,
				SpriteEffects.None,
				0);
			spriteBatch.End();
		}
	}
}

See Also

• Displaying the Framerate