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quakeControl // ------------------------------------------------------------ // A class to control the scale of the earthquake // ------------------------------------------------------------ class quakeControl { private float scale = (float) 0.0; // report the current scale and cause a wait based on scale public synchronized float rock() { if (scale == 0.0) { try { wait(); } catch (InterruptedException e) { } } else { try { wait((long)(500/scale)); } catch (InterruptedException e) { } scale *= 0.985; if (scale < 1) scale = (float) 0.0; } return scale; } // intensify the quake public synchronized void worsen() { scale += 2.5; notify(); } // stop the earthquake public void reset() { scale = (float) 0.0; } } // earthquake // ------------------------------------------------------------ // The earthquake applet class // ------------------------------------------------------------ public class earthquake extends Applet implements Runnable { // tracker -- for synchronous image loading private MediaTracker tracker; // quake -- the earthquake control object private quakeControl quake; // building -- the image of the target building private Image building; // shaker -- the actual thread to shake the building private Thread shaker; // scale -- last reported scale private float scale; // iw -- image width // ih -- image height // xdiff -- width difference between image and viewing area // ydiff -- height difference between image and viewing area // xoff -- current x offset of the image // yoff -- current y offset of the image private int iw, ih, xdiff, ydiff, xoff, yoff; // pieces_x -- x coordinate of small image pieces // pieces_y -- y coordinate of small image pieces // piece_width -- width of each small image piece // piece_height -- height of each small image piece private int pieces_x[], pieces_y[], piece_width, piece_height; // canvas -- drawing canvas // pieces -- small image pieces private Image canvas, pieces[]; // canvasGC -- graphics context of canvas private Graphics canvasGC; // up -- true if the building image is moving upward // collapsed -- true if building has totally collapsed // collapsing -- true if building is collapsing private boolean up, collapsed, collapsing; public void init() { // allocating variables and setting default values tracker = new MediaTracker(this); quake = new quakeControl(); String at = getParameter("img"); String image = (at != null) ? at : "royce.gif"; building = getImage(getCodeBase(), image); tracker.addImage(building, 0); building.getWidth(this); building.getHeight(this); pieces_x = new int[64]; pieces_y = new int[64]; pieces = new Image[64]; collapsed = false; collapsing = false; } public boolean imageUpdate(Image img, int flags, int x, int y, int width, int height) { // update various variables after the image size is known if (img == building) { if ((flags & WIDTH) != 0) iw = width; if ((flags & HEIGHT) != 0) ih = height; if ((((flags & WIDTH) != 0) || ((flags & HEIGHT) != 0)) && (iw > 0) && (ih > 0) && (ih > size().height) && (iw > size().width)) { // calculate width and height for small image piece_width = iw / 8; piece_height = ih / 8; // set starting coordinates for each individual small image for (int i = 0; i < 8; i++) for (int j = 0; j < 8; j++) { pieces_x[i * 8 + j] = iw * j / 8; pieces_y[i * 8 + j] = iw * i / 8; } xdiff = iw - size().width; ydiff = ih - size().height; xoff = - (xdiff / 2); yoff = - (ydiff / 2); up = false; } } return super.imageUpdate(img, flags, x, y, width, height); } public void start() { try { showStatus("earthquake: loading and chopping image ..."); if (canvas == null) { tracker.waitForID(0); canvas = createImage(building.getWidth(this), building.getHeight(this)); tracker.addImage(canvas, 2); canvasGC = canvas.getGraphics(); } canvasGC.drawImage(building, 0, 0, this); if (pieces[0] == null) { tracker.waitForID(0); // chop the building image into pieces for (int i = 0; i < 64; i++) { CropImageFilter cropFilter = new CropImageFilter(pieces_x[i], pieces_y[i], piece_width, piece_height); pieces[i] = createImage(new FilteredImageSource(building.getSource(), cropFilter)); tracker.addImage(pieces[i], 1); } tracker.waitForID(1); showStatus(""); } } catch (InterruptedException e) { } if (shaker == null) { scale = (float) 0.0; shaker = new Thread(this); shaker.start(); } } public void stop() { if (shaker != null) { shaker.stop(); shaker = null; } quake.reset(); } public void run() { while ((iw == -1) || (ih == -1) || ((xdiff > 0) && (ydiff > 0))) { // get the current scale scale = quake.rock(); if (collapsed == true) { canvasGC.drawImage(building, 0, 0, this); collapsed = false; } if (scale < 10) { // when scale is less than 10, keeping rocking if ((xdiff > 0) && (ydiff > 0)) { if (up) yoff = - (ydiff + yoff); else { xoff += -2 + Math.random() * 5.0; if (xoff > 0) xoff = 0; if (xoff < -xdiff) xoff = -xdiff; yoff = (int) ((1.0 - Math.pow(Math.random(), scale)) * (ydiff / 2)) - (ydiff / 2); } up = !up; } repaint(); } else { // otherwise, start the collapsing process collapsing = true; xoff = - (xdiff / 2); yoff = - (ydiff / 2); for (int k = 0; k < 80; k++) { for (int i = 0; i < 64; i++) { pieces_x[i] += -1 + Math.random() * 3; pieces_y[i] += Math.random() * 6 * (ih - pieces_y[i] + 50) / ih; canvasGC.drawImage(pieces[i], pieces_x[i], pieces_y[i], this); } repaint(); try { Thread.sleep(150); } catch (InterruptedException e) { } } for (int i = 0; i < 8; i++) for (int j = 0; j < 8; j++) { pieces_x[i * 8 + j] = iw * j / 8; pieces_y[i * 8 + j] = iw * i / 8; } quake.reset(); collapsed = true; collapsing = false; } } } public void paint(Graphics g) { if (canvas != null) g.drawImage(canvas, xoff, yoff, this); } public void update(Graphics g) { paint(g); } public boolean mouseDown(Event e, int x, int y) { if (!collapsing) quake.worsen(); return true; } }

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