//Damian Dyas L1 zad nr 9
package test;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;


public class Kolos extends JFrame{

	MyComponent komponent;
	int MAXN=200;
	int n=0;
	Timer timer;
	int alfa = 0;

	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;


			g.drawArc(x0-R, y0-R, 2*R, 2*R, 90-alfa, 180);

			int x1=xKart(x0,R/2,Math.toRadians(alfa-90));
			int y1=yKart(y0,R/2,Math.toRadians(alfa-90));
			g.drawArc(x1-R/2, y1-R/2, R, R, -90-alfa, 180);

			int x2=xKart(x0,R,Math.toRadians(alfa+90));
			int y2=yKart(y0,R,Math.toRadians(alfa+90));
			g.drawLine(x0, y0, x2, y2);

			int Obw = (int) Math.round(Math.PI*R+Math.PI*R/2+R);
			int na = (int)Math.round(MAXN*Math.PI*R/Obw);
			int nb = (int)Math.round((MAXN*Math.PI*R/2)/Obw);
			int nc = MAXN-na-nb;
			if(n<na) {
				double kat = Math.PI/2+Math.PI*n/na+Math.toRadians(alfa);
				x=(int)Math.round(x0+R*Math.cos(kat));
				y=(int)Math.round(y0+R*Math.sin(kat));
			}else if(n<na+nb) {
				double kat = Math.PI/2+Math.PI*(n-na)/nb+Math.toRadians(alfa);
				x=(int)Math.round(x1-(R/2)*Math.cos(kat));
				y=(int)Math.round(y1-(R/2)*Math.sin(kat));
			}else {
				x=x0+(x2-x0)*(n-na-nb)/nc;
				y=y0+(y2-y0)*(n-na-nb)/nc;
			}

			g.setColor(Color.RED);
			g.fillOval(x-6, y-6, 12, 12);
			g.setColor(Color.BLACK);
			super.paintComponent(g);
		}
		private int xKart(int x0, int r, double kat) {
			return (int)Math.round(x0+r*Math.cos(kat));
		}
		private int yKart(int y0, int r, double kat) {
			return (int)Math.round(y0+r*Math.sin(kat));
		}

	}
	public Kolos(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 Kolos("Kolos");
			}
		});
	}

}