1

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 Test4 extends JFrame{

	MyComponent komponent;
	int MAXN=200;
	int n=0;
	Timer timer;
	int alfa = 0;
	int [] xtab=new int[MAXN];
	int [] ytab=new int[MAXN];

	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;

			int x1=xKart(x0,R,Math.toRadians(alfa));
			int y1=yKart(y0,R,Math.toRadians(alfa));
			g.drawArc(x0-R, y0-R, 2*R, 2*R, 22-alfa, 315);

			int x2=xKart(x0,R,Math.toRadians(alfa-22));
			int y2=yKart(y0,R,Math.toRadians(alfa-22));
			g.drawLine(x0, y0, x2, y2);

			int x3=xKart(x0,R,Math.toRadians(alfa+22));
			int y3=yKart(y0,R,Math.toRadians(alfa+22));
			g.drawLine(x0, y0, x3, y3);







			xtab[n]=x;
			ytab[n]=y;
			g.fillOval(x-6, y-6, 12, 12);
			g.setColor(Color.RED);
			int D=10;
			for(int i=n;i>n-D;i--){
				int q=(i>=0)?i:MAXN+i;
				g.fillOval(xtab[q]-4, ytab[q]-4, 8, 8);
			}
			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 Test4(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 Test4("Test4");
			}
		});
	}

}