/*
 * Copyright(C) 1998, S.M.M for TECFA
 */

/*
 * No bullshit of anykind: use it as you want it.
 */

import vrml.field.*;
import vrml.node.*;
import vrml.*;

public class TheMovingSands extends Script
{
	private MFFloat height_changed;
	private SFInt32 wave_number;
	private SFFloat constant;
	private SFFloat amplitude;

	public void initialize()
	{

		height_changed = (MFFloat) getEventOut("height_changed");
		wave_number = (SFInt32) getField("wave_number");
		constant = (SFFloat) getField("constant");
		amplitude = (SFFloat) getField("amplitude");

		constant = new SFFloat(new Float(2*Math.PI*wave_number.getValue()).floatValue());

		set_fraction(0);

	}

	public void processEvent(Event TheEvent)
	{

		String TheEventName;

		TheEventName = TheEvent.getName();
		if(TheEventName.equals("set_fraction"))
		{
			set_fraction(((ConstSFFloat)TheEvent.getValue()).getValue());
		}
		else
		{
			System.out.println("Problem accessing EventIn for script\n");
		}

	}

	public void set_fraction(float fraction)
	{

		float otherconstant;

		otherconstant = new Float(Math.sin(2*Math.PI*fraction*amplitude.getValue())).floatValue();
		for (int i = 0; i < 30; i++)
		{
			for (int j = 0; j < 30; j++)
			{
				height_changed.set1Value((i*30+j), otherconstant*(new Float(Math.sin(((new Float(i).floatValue())/29f)*constant.getValue())*Math.sin(((new Float(j).floatValue())/29f)*constant.getValue())).floatValue()));
			}
		}

    }

}