1 files changed, 117 insertions, 0 deletions

diff --git a/user/classes/ImageTape.java b/user/classes/ImageTape.java
new file mode 100644
index 0000000..dce6a04
--- /dev/null
+++ b/user/classes/ImageTape.java
@@ -0,0 +1,117 @@
+
+import java.awt.*;
+
+public class ImageTape extends java.applet.Applet implements Runnable {
+    Image imgs[];
+    int nimgs;
+    int imgwidth;
+    int x, newx;
+    int dist = 5;
+    int timeout = 200;
+    Thread scroller;
+    String dir;
+
+    public void init() {
+        String at = getParameter("img");
+        dir = (at != null) ? at : "doc:/demo/images/duke";
+        at = getParameter("speed");
+        timeout = 1000 / ((at == null) ? 4 : Integer.valueOf(at).intValue());
+        at = getParameter("dir");
+        dist = (at == null) ? 5 : Integer.valueOf(at).intValue();
+        at = getParameter("nimgs");
+        nimgs = (at == null) ? 16 : Integer.valueOf(at).intValue();
+        newx = x = size().width;
+
+        imgs = new Image[nimgs];
+        for (int i = 0 ; i < nimgs ; i++) {
+            imgs[i] = getImage(getDocumentBase(), dir + "/T" + (i+1) + ".gif");
+        }
+    }
+
+    public void start() {
+        if (scroller == null) {
+            scroller = new Thread(this);
+            scroller.start();
+        }
+    }
+    public void stop() {
+        if (scroller != null) {
+            scroller.stop();
+            scroller = null;
+        }
+    }
+
+    public void run() {
+        while (true) {
+        try {Thread.currentThread().sleep(timeout);} catch (InterruptedException e){}
+            scroll(dist);
+        }
+    }
+
+    synchronized void scroll(int dist) {
+        newx += dist;
+        repaint();
+    }
+
+    public void update(Graphics g) {
+        g.setColor(Color.lightGray);
+
+        if (newx != x) {
+            //g.clipRect(1, 1, size().width-2, size().height-2);
+            int dist = newx - x;
+            if (dist > 0) {
+                g.copyArea(1, 1, (size().width-2) - dist, size().height-2, dist, 0);
+                for (x = newx ; x > size().width ; x -= Math.max(size().width - 2, imgwidth));
+                paint(g, 1, dist + 1);
+            } else {
+                g.copyArea(1 - dist, 1, (size().width-2) + dist, size().height-2, dist, 0);
+                for (x = newx ; x < 0 ; x += Math.max(size().width - 2, imgwidth));
+                paint(g, (size().width-1) + dist, size().width-1);
+            }
+        } else {
+            paint(g);
+        }
+    }
+
+    public boolean imageUpdate(Image img, int flags, int x, int y, int w, int h) {
+        if ((flags & WIDTH) != 0) {
+            imgwidth += img.getWidth(this);
+        }
+        return super.imageUpdate(img, flags, x, y, w, h);
+    }
+
+    public void paint(Graphics g, int fromx, int tox) {
+        int x = this.x;
+        newx = x;
+
+        g.setColor(Color.lightGray);
+        g.fillRect(fromx, 1, tox - fromx, size().height-2);
+        g.clipRect(fromx, 1, tox - fromx, size().height-2);
+        g.setColor(Color.black);
+
+        for (int i = 0 ; i < nimgs ; i++) {
+            if (imgs[i] == null) {
+                continue;
+            }
+
+            int w = imgs[i].getWidth(this);
+            int h = imgs[i].getHeight(this);
+            if ((w > 0) && (h > 0)) {
+                if ((x + w > fromx) && (x < tox)) {
+                    g.drawImage(imgs[i], x, size().height - (h+1), this);
+                }
+                if ((x + w) > size().width) {
+                    x -= Math.max(size().width - 2, imgwidth);
+                    if ((x + w > fromx) && (x < tox)) {
+                        g.drawImage(imgs[i], x, size().height - (h + 1), this);
+                    }
+                }
+                x += w;
+            }
+        }
+    }
+    public void paint(Graphics g) {
+        g.draw3DRect(0, 0, size().width, size().height, true);
+        paint(g, 1, size().width-1);
+    }
+}