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using System;
using Microsoft.Xna.Framework;
namespace V3.Screens
{
/// <summary>
/// Counts the frames per second based on the elapsed time and the number
/// of frames that have been drawn. Call Update in each Update, and
/// AddFrame in each Draw.
/// </summary>
public sealed class FpsCounter
{
/// <summary>
/// The current frames per second.
/// </summary>
public int Fps { get; private set; }
private int mFrameCount;
private TimeSpan mTimeSpan = TimeSpan.Zero;
/// <summary>
/// Updates the elapsed time and -- once every second -- the fps value.
/// </summary>
/// <param name="gameTime">the elapsed game time</param>
public void Update(GameTime gameTime)
{
mTimeSpan += gameTime.ElapsedGameTime;
if (mTimeSpan > TimeSpan.FromSeconds(1))
{
mTimeSpan -= TimeSpan.FromSeconds(1);
Fps = mFrameCount;
mFrameCount = 0;
}
}
/// <summary>
/// Registers that a frame has been drawn. Should be called once for
/// every Draw.
/// </summary>
public void AddFrame()
{
mFrameCount++;
}
}
}
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