import java.lang.Thread;
import java.awt.*;

public class polyAnim extends Thread
{
	boolean liveFlag;
    nCanvas pic;
	Button ssb;
	double a,b;
    double x0,y0,x1,y1;
	double x,y,xnew,ynew;
	
    public void getNumbers(){
        poly.getNumbers();
        this.a=poly.a; this.b=poly.b;
        this.x0=poly.x0; this.y0=poly.y0;
        this.x1=poly.x1; this.y1=poly.y1;
    } 
    
	public polyAnim(){
		this.pic=poly.pic;
		this.ssb=poly.ssButton;
        getNumbers();
        pic.eraseBuff();
		pic.update(pic.getGraphics());
		pic.screen(x0,y0,x1,y1);
        liveFlag=false;
	}
	
	public void myStart(){
        liveFlag=false;
        ssb.setLabel("stop");
        getNumbers();
		pic.eraseBuff();
		pic.update(pic.getGraphics());
        pic.screen(x0,y0,x1,y1);
        prepare();
        liveFlag=true;
        start();
	}
	
	public void myStop(){
		liveFlag=false;
		ssb.setLabel("start");
        while(this.isAlive()){}
	}

    public void prepare(){
        x=0.0; y=0.0;
		
        // pass first 1000 points
		for(int i=0;i<1000;i++){
			xnew=fx(x,y);
			ynew=fy(x,y);
			x=xnew; y=ynew;
        }
    }

	public void run(){
		while(liveFlag){
                pic.drawPoint(x,y);
                xnew=fx(x,y);
                ynew=fy(x,y);
                x=xnew; y=ynew;
        }
	}
    

////// Polynomial map //////
	public double fx (double x, double y){
		return(b*x + a - y*y);
	}
	public double fy(double x,double y){
		return(x);
	}

}