// ===========================================================================
//	IkedasChaos.java	1996 Yushin Hozumi All rights reserved.
//						Author:Yushin Hozumi
// ===========================================================================

package	StudioRAIN.chaos;

import StudioRAIN.geometry.*;
import StudioRAIN.chaos.*;

public class IkedasChaos implements ChaosGenerator2D
{
	float a, b;
	
	public IkedasChaos( float inA, float inB )
	{
		a = inA;
		b = inB;
	}

	public Vector2D transform( Vector2D inVector )
	{
		float theX = inVector.getX();
		float theY = inVector.getY();
		float theX2 = theX * theX;
		float theY2 = theY * theY;
		float theT = 0.4F - 6.0F / ( 1.0F + theX2 + theY2 );
		float theSinT = ( float )Math.sin( theT );
		float theCosT = ( float )Math.cos( theT );

		return new Vector2D
		(
			a + b * ( theX * theCosT - theY * theSinT ),
			b * ( theX * theSinT + theY * theCosT )
		);
	}

	public String getScript()
	{
		return 
			"t(n) = 0.4 - 6 / ( 1 + x(n) * x(n) + y(n) * y(n) )\n" +
			"x(n+1) =  ( " + Float.toString( a ) + " ) + ( " + Float.toString( b ) + " ) * ( x(n) * cos( t(n) ) - y(n) * sin( t(n) ) )\n" +
			"y(n+1) = ( " + Float.toString( b ) + " ) * ( x(n) * sin( t(n) ) + y(n) * cos( t(n) ) )\n";
	}
}