package horstmann.ch06_scene1;
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 java.util.ArrayList;

import javax.swing.JComponent;

/**
   A component that shows a scene composed of shapes.
 */
@SuppressWarnings("serial")
public class SceneComponent extends JComponent
{
	public SceneComponent()
	{
		shapes = new ArrayList<SceneShape>();

		addMouseListener(new
				MouseAdapter()
		{
			public void mousePressed(MouseEvent event)
			{
				mousePoint = event.getPoint();
				for (SceneShape s : shapes)
				{
					if (s.contains(mousePoint))
						s.setSelected(!s.isSelected());
				}
				repaint();
			}
		});

		addMouseMotionListener(new
				MouseMotionAdapter()
		{
			public void mouseDragged(MouseEvent event)
			{
				Point lastMousePoint = mousePoint;
				mousePoint = event.getPoint();
				for (SceneShape s : shapes)
				{
					if (s.isSelected())
					{
						double dx = mousePoint.getX() - lastMousePoint.getX();
						double dy = mousePoint.getY() - lastMousePoint.getY();
						s.translate((int) dx, (int) dy);
					}
				}
				repaint();
			}
		});
	}

	/**
      Adds a shape to the scene.
      @param s the shape to add
	 */
	public void add(SceneShape s)
	{
		shapes.add(s);
		repaint();
	}

	/**
      Removes all selected shapes from the scene.
	 */
	public void removeSelected()
	{
		for (int i = shapes.size() - 1; i >= 0; i--)
		{
			SceneShape s = shapes.get(i);
			if (s.isSelected()) shapes.remove(i);
		}
		repaint();
	}

	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		Graphics2D g2 = (Graphics2D) g;
		for (SceneShape s : shapes)
		{
			s.draw(g2);
			if (s.isSelected())
				s.drawSelection(g2);
		}
	}

	private ArrayList<SceneShape> shapes;
	private Point mousePoint;
}