import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import java.util.*;

/**
 * A component that shows a scene composed of items.
 */
public class CarComponent extends JComponent 
{
    private CarShape car = new CarShape(20, 20, 50);
    private Point mousePoint;

    public CarComponent() 
    {
        addMouseListener(new 
            MouseAdapter() 
            {
                public void mousePressed(MouseEvent event) 
                {
                    mousePoint = event.getPoint();
                    if (!car.contains(mousePoint)) {
                        mousePoint = null;
                    }
                }
            }
        );

        addMouseMotionListener(new 
            MouseMotionAdapter() 
            {
                public void mouseDragged(MouseEvent event) 
                {
                    if (mousePoint == null) return;
                    
                    Point lastMousePoint = mousePoint;
                    mousePoint = event.getPoint();

                    double dx = mousePoint.getX() - lastMousePoint.getX();
                    double dy = mousePoint.getY() - lastMousePoint.getY();
                    car.translate((int) dx, (int) dy);
                    repaint();
                }
            }
        );
    }

    public void paintComponent(Graphics g) 
    {
        Graphics2D g2 = (Graphics2D) g;
        car.draw(g2);
    }
}