001package horstmann.ch06_scene1;
002import java.awt.Graphics;
003import java.awt.Graphics2D;
004import java.awt.Point;
005import java.awt.event.MouseAdapter;
006import java.awt.event.MouseEvent;
007import java.awt.event.MouseMotionAdapter;
008import java.util.ArrayList;
009
010import javax.swing.JComponent;
011
012/**
013   A component that shows a scene composed of shapes.
014 */
015@SuppressWarnings("serial")
016public class SceneComponent extends JComponent
017{
018        public SceneComponent()
019        {
020                shapes = new ArrayList<SceneShape>();
021
022                addMouseListener(new
023                                MouseAdapter()
024                {
025                        public void mousePressed(MouseEvent event)
026                        {
027                                mousePoint = event.getPoint();
028                                for (SceneShape s : shapes)
029                                {
030                                        if (s.contains(mousePoint))
031                                                s.setSelected(!s.isSelected());
032                                }
033                                repaint();
034                        }
035                });
036
037                addMouseMotionListener(new
038                                MouseMotionAdapter()
039                {
040                        public void mouseDragged(MouseEvent event)
041                        {
042                                Point lastMousePoint = mousePoint;
043                                mousePoint = event.getPoint();
044                                for (SceneShape s : shapes)
045                                {
046                                        if (s.isSelected())
047                                        {
048                                                double dx = mousePoint.getX() - lastMousePoint.getX();
049                                                double dy = mousePoint.getY() - lastMousePoint.getY();
050                                                s.translate((int) dx, (int) dy);
051                                        }
052                                }
053                                repaint();
054                        }
055                });
056        }
057
058        /**
059      Adds a shape to the scene.
060      @param s the shape to add
061         */
062        public void add(SceneShape s)
063        {
064                shapes.add(s);
065                repaint();
066        }
067
068        /**
069      Removes all selected shapes from the scene.
070         */
071        public void removeSelected()
072        {
073                for (int i = shapes.size() - 1; i >= 0; i--)
074                {
075                        SceneShape s = shapes.get(i);
076                        if (s.isSelected()) shapes.remove(i);
077                }
078                repaint();
079        }
080
081        public void paintComponent(Graphics g)
082        {
083                super.paintComponent(g);
084                Graphics2D g2 = (Graphics2D) g;
085                for (SceneShape s : shapes)
086                {
087                        s.draw(g2);
088                        if (s.isSelected())
089                                s.drawSelection(g2);
090                }
091        }
092
093        private ArrayList<SceneShape> shapes;
094        private Point mousePoint;
095}