com.github.brunothg.game.engine.time.FPS Maven / Gradle / Ivy

package com.github.brunothg.game.engine.time;

/**
 * Helper class for monotoring the fps rate
 * 
 * @author Marvin Bruns
 *
 */
public class FPS
{

	private long fpsTime = TimeUtils.NANOSECONDS_PER_SECOND;

	private float fps = 0;
	private int fpsCounter = 0;

	/**
	 * Update the fps. Call this every time a frame is drawn.
	 * 
	 * @param elapsedTime The elapsed time since last drawing cycle in nanoseconds
	 */
	public void update(long elapsedTime)
	{

		fpsTime -= elapsedTime;
		fpsCounter++;

		if (fpsTime <= 0)
		{
			fps = (float) (fpsCounter + (fpsCounter * TimeUtils.Seconds(-fpsTime)));

			reset();
		}
	}

	/**
	 * Resets the fps rate and counter
	 */
	public void reset()
	{

		fpsTime = TimeUtils.NANOSECONDS_PER_SECOND;
		fpsCounter = 0;
	}

	public float getFps()
	{
		return fps;
	}
}