/*********************************************************************************************
Northeastern University
MIME Department

Course: MIM3142, Building Virtual Environments using Java3D
Term:   Spring, 1999

professor: Ronald R. Mourant
Student: Talal Al-Shihabi

taken from the Particles example written by Jeff White at Brown University
*********************************************************************************************/


/*********************************************************************************************
class FPS:

show the frame rate of the program
*********************************************************************************************/

import javax.media.j3d.*;
import javax.vecmath.*;
import java.util.Enumeration;

final class FPS extends Behavior {
	
	protected int nFrames;
	protected long startTime;
	protected final WakeupCondition w;	
	protected static float frameRate;
	public int i=1;
	
	public FPS(int nFrames){
		this.nFrames = nFrames;
		w = new WakeupOnElapsedFrames(nFrames);
	}
	
	public FPS(){
		this(200);
	}
	
	public void initialize(){
		setSchedulingBounds (new BoundingSphere( new Point3d(), 1000));
		startTime = System.currentTimeMillis();
		wakeupOn(w);
	}
	
	public void processStimulus(Enumeration criteria){
		long time = System.currentTimeMillis();
		frameRate=1000 * (float)nFrames/(float)(time-startTime);
		System.out.println("fps:"+ frameRate);
		startTime = time;
	
		wakeupOn(w);
	}
	
	public static float getFrameRate() {
	   return frameRate;
	}
}