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 zaliczenieC extends JFrame{

	MyComponent komponent;
	int MAXN=200;
	int n=0;
	int alfa;
	Timer timer;
	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 r=((w<h)?w:h)*9/20;

			double katW = -Math.toRadians(alfa);
			g.drawLine(x0, y0, xKart(x0,r,katW), yKart(y0,r,katW));
			double katE = (Math.PI+Math.PI/2.0)+Math.toRadians(alfa);
			g.drawLine(x0, y0, xKart(x0,r,katE), yKart(y0,-r,katE));
			g.drawArc(x0-r, y0-r, 2*r, 2*r, 270+alfa, 90);
			int obw=2*r+(int)Math.round(Math.PI*r/2.0);
			int nr=MAXN*r/obw;
			int nl=MAXN-2*nr;
			if(n<nr){
				x=x0;
				y=y0+r-r*(n)/nr;
			}
			else if(n< 2*nr){
				x=x0+r*(n-nr)/nr;
				y=y0;
			}
			else {
				double kat=Math.PI/2.0*(n-2*nr)/nl-Math.toRadians(alfa);
				x=(int)Math.round(x0+r*Math.cos(kat));
				y=(int)Math.round(y0+r*Math.sin(kat));
			}

			g.setColor(Color.RED);
			g.fillOval(x-6, y-6, 12, 12);


			g.setColor(Color.BLACK);
			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 zaliczenieC(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++;
				alfa--;
				if(n>=MAXN)
					n-=MAXN;
				komponent.repaint();
			}
		});
		timer.start();
		setVisible(true);
	}

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

			@Override
			public void run() {
				new zaliczenieC("Zaliczenie");
			}
		});
	}

}