home *** CD-ROM | disk | FTP | other *** search
Java Source | 1997-07-30 | 12.2 KB | 455 lines |
- // $Header: z:/admin/metro_examples/java/demo/ImageMap/rcs/ImageMap.java 1.1 1997/02/06 00:30:04 IPGIntel-2 Exp $
- /*
- * @(#)ImageMap.java 1.8 96/12/06
- *
- * Copyright (c) 1994-1996 Sun Microsystems, Inc. All Rights Reserved.
- *
- * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
- * modify and redistribute this software in source and binary code form,
- * provided that i) this copyright notice and license appear on all copies of
- * the software; and ii) Licensee does not utilize the software in a manner
- * which is disparaging to Sun.
- *
- * This software is provided "AS IS," without a warranty of any kind. ALL
- * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
- * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
- * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
- * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
- * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
- * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
- * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
- * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
- * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGES.
- *
- * This software is not designed or intended for use in on-line control of
- * aircraft, air traffic, aircraft navigation or aircraft communications; or in
- * the design, construction, operation or maintenance of any nuclear
- * facility. Licensee represents and warrants that it will not use or
- * redistribute the Software for such purposes.
- */
-
- import java.applet.Applet;
- import java.awt.Image;
- import java.awt.Graphics;
- import java.awt.Rectangle;
- import java.awt.MediaTracker;
- import java.util.StringTokenizer;
- import java.util.Vector;
- import java.util.Hashtable;
- import java.net.URL;
- import java.awt.image.ImageProducer;
- import java.awt.image.ImageFilter;
- import java.awt.image.CropImageFilter;
- import java.awt.image.FilteredImageSource;
- import java.net.MalformedURLException;
-
- /**
- * An extensible ImageMap applet class.
- * The active areas on the image are controlled by ImageArea classes
- * that can be dynamically loaded over the net.
- *
- * @author Jim Graham
- * @version 1.8, 12/06/96
- */
- public class ImageMap extends Applet implements Runnable {
- /**
- * The unhighlighted image being mapped.
- */
- Image baseImage;
-
- /**
- * The list of image area handling objects;
- */
- ImageMapArea areas[];
-
- /**
- * The primary highlight mode to be used.
- */
- static final int BRIGHTER = 0;
- static final int DARKER = 1;
-
- int hlmode = BRIGHTER;
-
- /**
- * The percentage of highlight to apply for the primary highlight mode.
- */
- int hlpercent = 50;
-
- /**
- * The MediaTracker for loading and constructing the various images.
- */
- MediaTracker tracker;
-
- /**
- * Get a rectangular region of the baseImage highlighted according to
- * the primary highlight specification.
- */
- Image getHighlight(int x, int y, int w, int h) {
- return getHighlight(x, y, w, h, hlmode, hlpercent);
- }
-
- /**
- * Get a rectangular region of the baseImage with a specific highlight.
- */
- Image getHighlight(int x, int y, int w, int h, int mode, int percent) {
- return getHighlight(x, y, w, h, new HighlightFilter(mode == BRIGHTER,
- percent));
- }
-
- /**
- * Get a rectangular region of the baseImage modified by an image filter.
- */
- Image getHighlight(int x, int y, int w, int h, ImageFilter filter) {
- ImageFilter cropfilter = new CropImageFilter(x, y, w, h);
- ImageProducer prod = new FilteredImageSource(baseImage.getSource(),
- cropfilter);
- return makeImage(prod, filter, 0);
- }
-
- /**
- * Make a filtered image based on another image.
- */
- Image makeImage(Image orig, ImageFilter filter) {
- return makeImage(orig.getSource(), filter);
- }
-
- /**
- * Make a filtered image based on another ImageProducer.
- */
- Image makeImage(ImageProducer prod, ImageFilter filter) {
- return makeImage(prod, filter,
- (prod == baseImage.getSource()) ? 1 : 0);
- }
-
- /**
- * Make a filtered image based on another ImageProducer.
- * Add it to the media tracker using the indicated ID.
- */
- Image makeImage(ImageProducer prod, ImageFilter filter, int ID) {
- Image filtered = createImage(new FilteredImageSource(prod, filter));
- tracker.addImage(filtered, ID);
- return filtered;
- }
-
- /**
- * Add an image to the list of images to be tracked.
- */
- void addImage(Image img) {
- tracker.addImage(img, 1);
- }
-
- /**
- * Parse a string representing the desired highlight to be applied.
- */
- void parseHighlight(String s) {
- if (s == null) {
- return;
- }
- if (s.startsWith("brighter")) {
- hlmode = BRIGHTER;
- if (s.length() > "brighter".length()) {
- hlpercent = Integer.parseInt(s.substring("brighter".length()));
- }
- } else if (s.startsWith("darker")) {
- hlmode = DARKER;
- if (s.length() > "darker".length()) {
- hlpercent = Integer.parseInt(s.substring("darker".length()));
- }
- }
- }
-
- /**
- * Initialize the applet. Get attributes.
- *
- * Initialize the ImageAreas.
- * Each ImageArea is a subclass of the class ImageArea, and is
- * specified with an attribute of the form:
- * areaN=ImageAreaClassName,arguments...
- * The ImageAreaClassName is parsed off and a new instance of that
- * class is created. The initializer for that class is passed a
- * reference to the applet and the remainder of the attribute
- * string, from which the class should retrieve any information it
- * needs about the area it controls and the actions it needs to
- * take within that area.
- */
- public void init() {
- String s;
-
- tracker = new MediaTracker(this);
- parseHighlight(getParameter("highlight"));
- introTune = getParameter("startsound");
- baseImage = getImage(getDocumentBase(), getParameter("img"));
- Vector areaVec = new Vector();
- int num = 1;
- while (true) {
- ImageMapArea newArea;
- s = getParameter("area"+num);
- if (s == null) {
- // Try rect for backwards compatibility.
- s = getParameter("rect"+num);
- if (s == null) {
- break;
- }
- try {
- newArea = new HighlightArea();
- newArea.init(this, s);
- areaVec.addElement(newArea);
- String url = getParameter("href"+num);
- if (url != null) {
- s += "," + url;
- newArea = new LinkArea();
- newArea.init(this, s);
- areaVec.addElement(newArea);
- }
- } catch (Exception e) {
- System.out.println("error processing: "+s);
- e.printStackTrace();
- break;
- }
- } else {
- try {
- int classend = s.indexOf(",");
- String name = s.substring(0, classend);
- newArea = (ImageMapArea) Class.forName(name).newInstance();
- s = s.substring(classend+1);
- newArea.init(this, s);
- areaVec.addElement(newArea);
- } catch (Exception e) {
- System.out.println("error processing: "+s);
- e.printStackTrace();
- break;
- }
- }
- num++;
- }
- areas = new ImageMapArea[areaVec.size()];
- areaVec.copyInto(areas);
- checkSize();
- }
-
- Thread aniThread = null;
- String introTune = null;
-
- public void start() {
- if (introTune != null)
- try {
- play(new URL(getDocumentBase(), introTune));
- } catch (MalformedURLException e) {}
- if (aniThread == null) {
- aniThread = new Thread(this);
- aniThread.setName("ImageMap Animator");
- aniThread.start();
- }
- }
-
- public void run() {
- Thread me = Thread.currentThread();
- tracker.checkAll(true);
- for (int i = areas.length; --i >= 0; ) {
- areas[i].getMedia();
- }
- me.setPriority(Thread.MIN_PRIORITY);
- while (aniThread == me) {
- boolean animating = false;
- for (int i = areas.length; --i >= 0; ) {
- animating = areas[i].animate() || animating;
- }
- try {
- synchronized(this) {
- wait(animating ? 100 : 0);
- }
- } catch (InterruptedException e) {
- break;
- }
- }
- }
-
- public synchronized void startAnimation() {
- notify();
- }
-
- public synchronized void stop() {
- aniThread = null;
- notify();
- for (int i = 0; i < areas.length; i++) {
- areas[i].exit();
- }
- }
-
- /**
- * Check the size of this applet while the image is being loaded.
- */
- void checkSize() {
- int w = baseImage.getWidth(this);
- int h = baseImage.getHeight(this);
- if (w > 0 && h > 0) {
- resize(w, h);
- synchronized(this) {
- fullrepaint = true;
- }
- repaint(0, 0, w, h);
- }
- }
-
- private boolean fullrepaint = false;
- private final static long UPDATERATE = 100;
-
- /**
- * Handle updates from images being loaded.
- */
- public boolean imageUpdate(Image img, int infoflags,
- int x, int y, int width, int height) {
- if ((infoflags & (WIDTH | HEIGHT)) != 0) {
- checkSize();
- }
- if ((infoflags & (SOMEBITS | FRAMEBITS | ALLBITS)) != 0) {
- synchronized(this) {
- fullrepaint = true;
- }
- repaint(((infoflags & (FRAMEBITS | ALLBITS)) != 0)
- ? 0 : UPDATERATE,
- x, y, width, height);
- }
- return (infoflags & (ALLBITS | ERROR)) == 0;
- }
-
- /**
- * Paint the image and all active highlights.
- */
- public void paint(Graphics g) {
- synchronized(this) {
- fullrepaint = false;
- }
- if (baseImage == null) {
- return;
- }
- g.drawImage(baseImage, 0, 0, this);
- if (areas != null) {
- for (int i = areas.length; --i >= 0; ) {
- areas[i].highlight(g);
- }
- }
- }
-
- /**
- * Update the active highlights on the image.
- */
- public void update(Graphics g) {
- boolean full;
- synchronized(this) {
- full = fullrepaint;
- }
- if (full) {
- paint(g);
- return;
- }
- if (baseImage == null) {
- return;
- }
- g.drawImage(baseImage, 0, 0, this);
- if (areas == null) {
- return;
- }
- // First unhighlight all of the deactivated areas
- for (int i = areas.length; --i >= 0; ) {
- areas[i].highlight(g);
- }
- }
-
- /**
- * Make sure that no ImageAreas are highlighted.
- */
- public boolean mouseExit(java.awt.Event evt, int x, int y) {
- for (int i = 0; i < areas.length; i++) {
- areas[i].checkExit();
- }
-
- return true;
- }
-
- /**
- * Find the ImageAreas that the mouse is in.
- */
- public boolean mouseMove(java.awt.Event evt, int x, int y) {
- boolean eaten = false;
-
- for (int i = 0; i < areas.length; i++) {
- if (!eaten && areas[i].inside(x, y)) {
- eaten = areas[i].checkEnter(x, y);
- } else {
- areas[i].checkExit();
- }
- }
-
- return true;
- }
-
- int pressX;
- int pressY;
-
- /**
- * Inform all active ImageAreas of a mouse press.
- */
- public boolean mouseDown(java.awt.Event evt, int x, int y) {
- pressX = x;
- pressY = y;
-
- for (int i = 0; i < areas.length; i++) {
- if (areas[i].inside(x, y)) {
- if (areas[i].press(x, y)) {
- break;
- }
- }
- }
-
- return true;
- }
-
- /**
- * Inform all active ImageAreas of a mouse release.
- * Only those areas that were inside the original mouseDown()
- * are informed of the mouseUp.
- */
- public boolean mouseUp(java.awt.Event evt, int x, int y) {
- for (int i = 0; i < areas.length; i++) {
- if (areas[i].inside(pressX, pressY)) {
- if (areas[i].lift(x, y)) {
- break;
- }
- }
- }
-
- return true;
- }
-
- /**
- * Inform all active ImageAreas of a mouse drag.
- * Only those areas that were inside the original mouseDown()
- * are informed of the mouseUp.
- */
- public boolean mouseDrag(java.awt.Event evt, int x, int y) {
- mouseMove(evt, x, y);
- for (int i = 0; i < areas.length; i++) {
- if (areas[i].inside(pressX, pressY)) {
- if (areas[i].drag(x, y)) {
- break;
- }
- }
- }
-
- return true;
- }
-
- /**
- * Scan all areas looking for the topmost status string.
- */
- public void newStatus() {
- String msg = null;
- for (int i = 0; i < areas.length; i++) {
- msg = areas[i].getStatus(msg);
- }
- showStatus(msg);
- }
- }
-