001 package breakout;
002
003 import java.awt.*;
004 import java.awt.image.MemoryImageSource;
005 import javax.swing.*;
006 import javax.swing.border.*;
007 import java.util.*;
008
009 /** Defines behavior for a JPanel built to display a Board.
010 * <BR><BR>
011 * A BoardPanel is one of the building blocks that make up the
012 * {@link breakout.BreakoutUI} JFrame.
013 **/
014 public class BoardPanel extends JPanel {
015 /** Default width **/
016 public static final int PREF_WIDTH = 350;
017 /** Default height **/
018 public static final int PREF_HEIGHT = 220;
019
020 private BreakoutUI ui;
021 private Cursor transCursor;
022 private Cursor defCursor;
023 private boolean transified;
024 /** Creates a new BoardPanel in a particular BreakoutUI.
025 * @param bui the BreakoutUI this BoardPanel belongs to.
026 **/
027 public BoardPanel(BreakoutUI bui) {
028 Dimension mySize = new Dimension(BoardPanel.PREF_WIDTH, BoardPanel.PREF_HEIGHT);
029 this.setSize(mySize.width,mySize.height);
030 this.setPreferredSize(mySize);
031 this.setMaximumSize(mySize);
032 this.setMinimumSize(mySize);
033 this.setBorder(new EtchedBorder());
034
035 this.ui = bui;
036
037 /* This is how we build a "hidden" cursor:
038 * - Create an Image with no alpha -- essentially transparent
039 * - Create and store a custom cursor based on that image.
040 */
041 try {
042 Toolkit tk = Toolkit.getDefaultToolkit();
043 Image img = this.createImage(new MemoryImageSource(16, 16, new int[16*16], 0, 16));
044 this.transCursor = tk.createCustomCursor(img, new Point(0,0), "trans");
045 this.defCursor = new Cursor(Cursor.DEFAULT_CURSOR);
046 } catch(IndexOutOfBoundsException ioobe) { System.err.println(ioobe.getMessage());
047 } catch(HeadlessException he) { System.err.println(he.getMessage());
048 }
049 this.transified=false;
050 }
051
052
053 /** Switches the cursor for this BoardPanel between default and "hidden"
054 **/
055 public void transifyCursor() {
056 this.setCursor(this.transCursor);
057 }
058
059 /** Switches the cursor for this BoardPanel between "hidden" and default.
060 **/
061 public void deTransifyCursor() {
062 this.setCursor(this.defCursor);
063 }
064
065 /** Paints the BoardPanel and all the Board components.
066 *
067 * <BR><BR>How it works: A new Graphics is created for each BreakoutComponent,
068 * then translated to the BreakoutComponent's location. The BreakoutComponent's
069 * <code>paint(Graphics)</code> method is then called with the translated Graphics.
070 *
071 * @param g Graphics object for this panel's coordinate frame.
072 **/
073 public void paint(Graphics g) {
074 super.paint(g);
075 g.setColor(Color.white);
076 g.fillRect(0,0,this.getSize().width, this.getSize().height);
077 if(this.ui.getWorld()!=null) {
078 Board board = this.ui.getWorld().getBoard();
079 Iterator it = board.getAllComponents();
080 while(it.hasNext()) {
081 BreakoutComponent bc = (BreakoutComponent)it.next();
082 Graphics gtemp = g.create();
083 gtemp.translate(bc.getLocation().x, bc.getLocation().y);
084 gtemp.setColor(Color.black);
085 bc.paint(gtemp);
086 }
087 }
088 }
089 }