/**
 * JuliaSet is an implementation of ChaoticFunction.
 * 
 * @author Ben Garrison bdg@cc.gatech.edu
 * @version 1.0
 */
public class JuliaSet extends Fractal {

	private double cx;
	private double cy;
	
	public JuliaSet(double cx, double cy)
	{
		super(1000);
		this.cx = cx;
		this.cy = cy;
	}
	
	public JuliaSet()
	{
		this(-.391, -.587);
	}
	
	
	/**
	 * @see ChaoticFunction#getColor(double, double)
	 */
	public int getColor(double x, double y) {
		double newx;
		double newy;
		
		//System.out.println("x: " + x + "\ty: " + y);
		for(int i=0;i<iterations;i++) {		
			if(modulusSqrd(x,y) > 4) {
				return i;
			}
			
			newx = (x*x-y*y)+cx;
			newy = (2*x*y+cy);
			x = newx;
			y = newy;
		}
		
		return 0;
	}
}