package horstmann.ch06_car;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.swing.JComponent;

/**
   A component that shows a scene composed of items.
 */
@SuppressWarnings("serial")
public class CarComponent extends JComponent
{
	public CarComponent()
	{
		car = new CarShape(20, 20, 50);
		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);
	}

	private CarShape car;
	private Point mousePoint;
}