Re: Clipped image when g.

From:
"Ian Shef" <ian.shef@THRWHITE.remove-dii-this>
Newsgroups:
comp.lang.java.gui
Date:
Wed, 27 Apr 2011 15:37:20 GMT
Message-ID:
<Xns997783D31D5Evaj4088ianshef@138.126.254.210>
  To: comp.lang.java.gui
"A. Farber" <Alexander.Farber@gmail.com> wrote in
news:1184921933.889932.228120@k79g2000hse.googlegroups.com:
<SNIP>

Now I'm struggling with 2 further problems -

1) my Card LW component flickers even though the Deck
    LW Container (represents playing table) to which I add
    it is double-buffered. (Yes I've read few docs about
    flickering LW Components, but still can't fix it)


I don't understand. As far as I know, there is no double-buffering in AWT
except for the BufferStrategy stuff that was added in version 1.4. Is this
what you are doing?
On the other hand, Swing has double buffering. Are you mixing AWT and
Swing?

If it is either of these two cases above, I can't help you. I haven't
worked with BufferStrategy, and I haven't mixed AWT and Swing.
I have performed double buffering in AWT by handling it myself, forcing
paint(...) and update(...) to perform writing on my own buffer, and then
copying the buffer to the screen myself. I would have to really dig to
find the code where I did this.

2) Defining a custom AWT event turned out to be such
    a pain! I wanted my Card to send an event to listeners
    after it has been dragged and released (i.e. the card
   has been played), but have ended up with this hack:

        protected void processMouseEvent(MouseEvent event) {
                if (event.getID() == MouseEvent.MOUSE_PRESSED) {
                        oldX = getLocation().x;
                        oldY = getLocation().y;

                        relX = event.getX();
                        relY = event.getY();

                        dragged = this;
                } else if (event.getID() == MouseEvent.MOUSE_RELEASED)
{
                        // pass the mouse released event to the
listeners,
                        // but only if this card has been dragged
around
                        if (dragged != null) {
                                super.processMouseEvent(event);

                                dragged = null;
                        }
                }
        }


I have never defined custom AWT events, so I can't help. Typically (in
AWT) I have done something along the lines of what you did.

Perhaps it is not too late to switch to Swing?

Regards
Alex

PS: And here is my full source code:

// $Id: Card.java,v 1.5 2007/07/19 15:19:46 afarber Exp $

// Card lightweight component which sends a MouseEvent to the
// listeners when it has been dragged around and released

import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;

class Card extends Component
{
     public static final int WIDTH = 70;
     public static final int HEIGHT = 100;

     // shadow offsets
     public static final int SHDX = 3;
     public static final int SHDY = 4;

     public static final int SPADE = 0;
     public static final int CLUB = 1;
     public static final int DIAMOND = 2;
     public static final int HEART = 3;
     public static final int NOTRUMP = 4;

     // which cards may be moved
     public static int allowedOwner;
     public static int allowedSuit = NOTRUMP;

     private static Card dragged;
     private static Image[][] faces;
     private static Image back;
     private static Image shadow;
     private int oldX, oldY;
     // position of the mouse pointer inside the card, when pressed
     private int relX, relY;

     public byte rank, suit;
     public boolean opened;
     // 0, 1, 2 = card belongs to a player; 3 = is on the table
     public int owner;

     public final static String[] SUIT = {
          " spades",
          " clubs",
          " diamonds",
          " hearts"
     };
     public final static String[] RANK4 = {
          "7",
          "8",
          "9",
          "10",
          "J",
          "Q",
          "K",
          "A"
     };

     protected Card() {
          // make the card bigger or the shadow will be clipped
          setSize(WIDTH + SHDX, HEIGHT + SHDY);

          enableEvents(AWTEvent.MOUSE_EVENT_MASK |
              AWTEvent.MOUSE_MOTION_EVENT_MASK);
     }

     public Card(int rank, int suit) {
          this();

          this.rank = (byte) rank;
          this.suit = (byte) suit;
     }

     public Card(char ch) {
          this();

          rank = (byte) (ch >> 8);
          suit = (byte) ch;
     }

     public boolean equals(Card card) {
          return (rank == card.rank && suit == card.suit);
     }

     public char toChar() {
          return (char) ((rank << 8) | suit);
     }

     public void update(Graphics g) {
     }

     public void paint(Graphics g) {
          if (this == dragged)
               g.drawImage(shadow, SHDX, SHDY, this);
          else
               g.translate(SHDX, SHDY);
          g.drawImage(opened ? faces[rank][suit] : back, 0, 0, this);
     }

     public static void prepImages(Image big) {
          ImageProducer source = big.getSource();

          // create 32 card images
          faces = new Image[8][4];
          for (int rank = 0; rank < 8; rank++)
               for (int suit = SPADE; suit <= HEART; suit++) {
                    ImageFilter filter =
                        new CropImageFilter(rank * WIDTH,
                        suit * HEIGHT, WIDTH, HEIGHT);
                    ImageProducer producer = new
                        FilteredImageSource(source, filter);
                    faces[rank][suit] = Toolkit.getDefaultToolkit()
                        .createImage(producer);
               }
          // create the image of a card's back
          ImageFilter filter =
              new CropImageFilter(560, 0, WIDTH, HEIGHT);
          ImageProducer producer =
              new FilteredImageSource(source, filter);
          back = Toolkit.getDefaultToolkit().createImage(producer);
          // use a card shape to create shadow
          int[] pixels = new int[WIDTH * HEIGHT];
          PixelGrabber grabber = new PixelGrabber(big, 0, 0,
              WIDTH, HEIGHT, pixels, 0, WIDTH);
          try {
               grabber.grabPixels();
          } catch (InterruptedException ex) {
               ex.printStackTrace();
          }
          // turn non-transparent pixels to shadow
          for (int i = 0; i < pixels.length; i++)
               if (0 != (pixels[i] & 0xFF000000))
                    pixels[i] = 0x60000000;
          shadow = Toolkit.getDefaultToolkit().createImage(
              new MemoryImageSource(WIDTH, HEIGHT, pixels, 0, WIDTH));
     }

     protected void processMouseEvent(MouseEvent event) {
          if (event.getID() == MouseEvent.MOUSE_PRESSED) {
               oldX = getLocation().x;
               oldY = getLocation().y;

               relX = event.getX();
               relY = event.getY();

               dragged = this;
          } else if (event.getID() == MouseEvent.MOUSE_RELEASED) {
               // pass the mouse released event to the listeners,
               // but only if this card has been dragged around
               if (dragged != null) {
                    super.processMouseEvent(event);

                    dragged = null;
               }
          }
     }

     protected void processMouseMotionEvent(MouseEvent event) {
          if (event.getID() == MouseEvent.MOUSE_DRAGGED) {
               // XXX check allowedOwner + allowedSuit
               // XXX here and display a red glow

               Point loc = getLocation();
               event.translatePoint(loc.x, loc.y);
               setLocation(event.getX() - relX, event.getY() - relY);
          }
     }

     public void putBack() {
          setLocation(oldX, oldY);
     }

     public static int randomRank() {
          return (int) Math.floor(8.0 * Math.random());
     }

     public static int randomSuit() {
          return (int) Math.floor(4.0 * Math.random());
     }

     // FOR TESTING: gmake build/Card.class && java -cp build/ Card
     public static void main(String args[]) {
          Frame frame = new Frame("Card Test");
          frame.setForeground(Color.white);
          frame.setBackground(Color.gray);
          frame.setLayout(null);

          final String PATH = "media/cards.gif";
          Image big = Toolkit.getDefaultToolkit().getImage(PATH);
          MediaTracker tracker = new MediaTracker(frame);
          tracker.addImage(big, 0);
          try {
               tracker.waitForAll();
          } catch (Exception ex) {
               ex.printStackTrace();
          }
          if (tracker.isErrorAny()) {
               System.err.println("Image " + PATH + " not found");
               return;
          }

          Card.prepImages(big);
          Card card = new Card(randomRank(), randomSuit());
          card.opened = true;

          card.addMouseListener(new MouseAdapter() {
               public void mouseReleased(MouseEvent event) {
                    //System.out.println("mouseReleased" + event);

                    Card card = (Card) event.getSource();

                    System.out.println("The card (" +
                         RANK4[card.rank] + ", " +
                         SUIT[card.suit] + ") has been played!");

                    card.putBack();
               }
          });

          frame.add(card);
          frame.validate();
          card.setLocation(200, 100);

          frame.setSize(400, 300);
          frame.setVisible(true);
     }
}


--
Ian Shef 805/F6 * These are my personal opinions
Raytheon Company * and not those of my employer.
PO Box 11337 *
Tucson, AZ 85734-1337 *

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