/* -------------------------------------------------------------
This applet does a crude test of floating-point speed.

Custom classes: DumbFlops

Steve Witham <sw@tiac.net>

1999.02.19: This was soon after I wrote it.  Some wierd hacks for Windows Ms. IE.
1999.07.19: Made each call to paint() do one test then call repaint(),
            instead of running repeated tests in a single call to paint().
1999.08.03: Added a sync() call.  Don't yet know whether it tames Ms. WinIE.

------------------------------------------------------------- */

import java.applet.Applet;
import java.util.*;
import java.awt.*;

public class DumbFlops extends Applet {

	private int reps;
	private boolean done;
	private double flops;
   
	public void init() {
		this.done = false;
		this.reps = 10000;
		this.flops = 0.0;
		this.repaint();  /* Ask someone to call my update--Does this help at all? */
						/* update = clear (paint background) then call my paint. */
		}
   
	private void drawsub( Graphics g ) {
		g.setColor( Color.yellow );
		g.fillRect( 0, 0, 300, 80 );
		g.setColor( Color.black );
		g.drawString( " Starting " + this.reps + " reps...", 20, 20 );
		if( this.done ) {
			g.drawString( " " + this.flops + " 'flop'/sec", 20, 40 );
			g.drawString( " Done.", 20, 60 );
			}
		else if( this.flops > 0.0 ) {
			g.drawString( " (guess: " + this.flops + " 'flop'/sec)", 20, 40);
			}
		Toolkit.getDefaultToolkit().sync();		     
		}
      
	public void paint(Graphics g) {   
		int	i, reps;
		long t0, t1;
		double x, y, dur;

		this.drawsub( g );
		if( !this.done ) {
			reps = this.reps;           
			t0 = System.currentTimeMillis();                                                   
			y = 0.0;								
			for( i = 0;  i < reps;  i++ ) {        
				x = i;								
				y += x * x;							
				}									
			t1 = System.currentTimeMillis();
			dur = ( t1 - t0 ) / 1000.0;
			if( dur > 0.5 ) {
		    	this.flops = 2.0 * reps / dur;
		    	}
			if( dur < 10 ) {
				this.reps = (int) ( this.reps * 15.0 / (dur + 1.0) );
				}
			else {
				this.done = true;
				}
			this.repaint();	/* Remind me to paint again! */
			}
		}														
	}