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Groups > comp.lang.java.gui > #2080

Clipped image when g.draw

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  To: comp.lang.java.gui
Hello,

I've created a class (full source code at the bottom)
which extends java.awt.Component and is supposed to
represent a playing card. If the card is being dragged,
I'd like to draw a shadow underneath it. And the card
itself should be drawn a little bit displaced - to make
the impression that it has been lifted:

	public void paint(Graphics g) {
		if (this == dragged) {
			g.drawImage(shadow, 0, 0, this);
			g.drawImage(cardImg, -3, -4, this);
		} else {
			g.drawImage(cardImg, 0, 0, this);
		}
	}

My problem is however that the cardImg is being
clipped. Does anybody please have an idea how
to workaround this?

Thank you
Alex

PS: Here is the full source code:

// $Id: Card.java,v 1.2 2007/07/18 10:10:33 afarber Exp $

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

class Card extends Component implements MouseListener,
MouseMotionListener
{
	public static final int		WIDTH = 70;
	public static final int		HEIGHT = 100;

	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;

	private static Card		dragged;

	private static Image[][]	faces;
	private static Image		back;
	private static Image		shadow;

	public byte			rank, suit;
	public boolean			opened;
	public int			whose;

	public Card(int rank, int suit) {
		setSize(WIDTH, HEIGHT);
		addMouseListener(this);
		addMouseMotionListener(this);

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

	public Card(char ch) {
		setSize(WIDTH, HEIGHT);
		addMouseListener(this);
		addMouseMotionListener(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 paint(Graphics g) {
		if (this == dragged) {
			g.drawImage(shadow, 0, 0, this);

                        // XXX the image below is clipped :-(
			g.drawImage(opened ? faces[rank][suit] : back,
			    -3, -4, this);
		} else {
			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));
	}

	public void mouseExited(MouseEvent event) {
		System.out.println("mouseExited:" + event);
		dragged = null;
		getParent().repaint();
	}

	public void mouseReleased(MouseEvent event) {
		System.out.println("mouseReleased" + event);
		dragged = null;
		getParent().repaint();
	}

	public void mousePressed(MouseEvent event) {
		System.out.println("mousePressed" + event);
		dragged = this;
		getParent().repaint();
	}

	public void mouseEntered(MouseEvent event) {
		System.out.println("mouseEntered" + event);
	}

	public void mouseClicked(MouseEvent event) {
		System.out.println("mouseClicked" + event);
	}

	public void mouseMoved(MouseEvent event) {
		System.out.println("mouseMoved" + event);
	}

	public void mouseDragged(MouseEvent event) {
		System.out.println("mouseDragged" + event);
	}

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

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

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

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

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Clipped image when g.draw "A. Farber" <a..farber@THRWHITE.remove-dii-this> - 2011-04-27 15:37 +0000
  Re: Clipped image when g. "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:37 +0000
    Re: Clipped image when g. "A. Farber" <a..farber@THRWHITE.remove-dii-this> - 2011-04-27 15:37 +0000
  Re: Clipped image when g. "Ian Shef" <ian.shef@THRWHITE.remove-dii-this> - 2011-04-27 15:37 +0000
    Re: Clipped image when g. "A. Farber" <a..farber@THRWHITE.remove-dii-this> - 2011-04-27 15:37 +0000
      Re: Clipped image when g. "Ian Shef" <ian.shef@THRWHITE.remove-dii-this> - 2011-04-27 15:37 +0000

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