import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;



public class A12 extends JFrame{

	MyComponent komponent;
	int MAXN=400;
	int n=0;
	int alfa=0;
	Timer timer;
	int [] xtab=new int[MAXN];
	int [] ytab=new int[MAXN];
	int D=20;
	class MyComponent extends JComponent{

		@Override
		protected void paintComponent(Graphics g) {
			int w=getWidth();
			int h=getHeight();
			int x=0,y=0;
			int x0=w/2;
			int y0=h/2;
			int r1=w/4;//promien duzy
			int r2=r1/2;//promien maly
			double katN=-Math.PI/2.0+Math.toRadians(alfa);
			double katS=Math.PI/2.0+Math.toRadians(alfa);
			double katE=Math.toRadians(-alfa);
			double katW=Math.PI+Math.toRadians(-alfa);

			g.drawArc(x0-r1, y0-r1, r1*2, r1*2, 0+alfa, 180);
			g.drawLine(xKart(x0, r1, katW), yKart(y0, r1, katW), x0, y0);
			g.drawArc(xKart(x0, r2, katE)-r2, yKart(y0, r2, katE)-r2, r2*2, r2*2, 180+alfa, 180);
			g.setColor(Color.RED);


			int b=(int)(Math.PI*r2); //maly luk
			int a = (int)(Math.PI*r1);  //duzy łuk  2 pi r -bo na polowe
			int c = r1; //prosta

			int obw = a+c+b;
			int nc=MAXN*c/obw; // liczba skoków dla duzego luku
			int nb=MAXN*b/obw ; // liczba skoków dla małego  luku
			int na=MAXN-nc-nb; // liczba skoków dla prostej


		if(n<nb) {
			double kat=Math.PI+Math.PI*(n)/nb-Math.toRadians(alfa);
			x=(int)Math.round((xKart(x0, r2, katE)-r2*Math.cos(kat)));
			y=(int)Math.round((yKart(y0, r2, katE)-r2*Math.sin(kat)));

			}
		else if(n<nb+nc) {
			int xx=xKart(x0,r1,katW);
			int yy=yKart(y0,r1,katW);
			x=xx+(xx-x0)*(n-nb-nc)/nc;
			y=yy+(yy-y0)*(n-nb-nc)/nc;
			}
		else {
			double kat=Math.PI/2-Math.PI*(n-nb-na-nc)/na+Math.toRadians(alfa);
			x=(int)Math.round(x0+r1*Math.sin(kat));
			y=(int)Math.round(y0+r1*Math.cos(kat));

		}

		xtab[n]=x;
		ytab[n]=y;
		g.setColor(Color.GREEN);
		g.fillOval(x-6, y-6, 12, 12);

			super.paintComponent(g);

		}
		private int yKart(int y0, int r, double kat) {
			return (int)Math.round(y0+r*Math.sin(kat));
		}

		private int xKart(int x0, int r, double kat) {
			return (int)Math.round(x0+r*Math.cos(kat));
		}
	}
	public A12(String string) {
		super(string);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		Toolkit kit=Toolkit.getDefaultToolkit();
		Dimension d=kit.getScreenSize();
		setBounds(d.width/4, d.height/4, d.width/2, d.height/2);
		add(komponent=new MyComponent());
		timer=new Timer(20,new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				n++;
				if(n>=MAXN)
					n-=MAXN;
				alfa++;
				komponent.repaint();
			}
		});
		timer.start();
		setVisible(true);
	}

	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {

			@Override
			public void run() {
				new A12("Animek 12");
			}
		});
	}

}