Changeset 11693

Timestamp:

2006-04-26T09:17:30+12:00 (18 years ago)

Author:

shaoqun

Message:

add code to check status of downing image

File:

• trunk/gsdl/src/java/org/nzdl/gsdl/GsdlCollageApplet/DownloadImages.java (modified) (7 diffs)

trunk/gsdl/src/java/org/nzdl/gsdl/GsdlCollageApplet/DownloadImages.java

@@ -65 +65 @@
     GsdlCollageApplet app_ = null;
     boolean isJava2_;
-    int num_of_downloads;
+    int num_of_downloads = 1;
     boolean stopDownload;
 
-  
+    MediaTracker tracker_;
 
     /** Initialises an empty vector to store downloaded images in and sets
@@ -79 +79 @@
     }
 
-
     /** Push a new image into the vector of downloaded images
      *  @param image the graphical image to add
@@ -86 +85 @@
     public  synchronized int downloadImage(MediaTracker tracker, URL url, String urlString, String name)
     {
+    
+    tracker_= tracker;
 
     while (downloaded_image != null ){
@@ -97 +98 @@
 
     }
+      
+    Image image = Toolkit.getDefaultToolkit().getImage(url);
+    tracker_.addImage(image,num_of_downloads);
 
-        Image image = Toolkit.getDefaultToolkit().getImage(url);
+    try{
+        tracker_.waitForID(num_of_downloads);
+    }
+    catch (InterruptedException e){
+        notify();
+        return num_of_downloads;
+    }
+    
 
-        tracker.addImage(image,num_of_downloads);
+    downloaded_image  = new ImageUrlTriple(image,url,urlString,name);
 
-        try{
-           System.out.println( "   downloading ..."); 
-           tracker.waitForID(num_of_downloads);
-                System.out.println(Thread.currentThread().getName() + " get!!!"); 
-           }
-           catch (InterruptedException e){
-            return 0;
-         }
-     
-    downloaded_image  = new ImageUrlTriple(image,url,urlString,name);
-    num_of_downloads++;
-
-    if (num_of_downloads == app_.maxDownloads()){
-        stopDownload = true;
-            System.out.println("num_of_downloads "+num_of_downloads);
-
-    }   
-    //System.out.println("num_of_downloads "+num_of_downloads +" ");
     notify();
        
     return num_of_downloads ;
     }
-
+ 
+ 
     /** Remove the image from the specified position in the array of downloaded images
      *  @return an ImageUrlTriple containing the image, url and image name */
@@ -131 +125 @@
     if (stopDownload)  return null;   
 
-    while (downloaded_image == null && !stopDownload){
+    while (downloaded_image == null){
         System.out.println(Thread.currentThread().getName() + " wait to get Collage image...");
         try{
@@ -137 +131 @@
         }
         catch(InterruptedException e){
-        //e.printStackTrace();  
+        //e.printStackTrace();
+        downloaded_image = null;
+        notify();
         return null;
         }
     }
-
-    collage_image = process(downloaded_image);
-    downloaded_image = null;
-       
-        notify();
-    System.out.println(Thread.currentThread().getName() + " get Collage image!!!");
-        return collage_image;
+         
+        if (tracker_.statusID(num_of_downloads, false) == MediaTracker.COMPLETE){
+        collage_image = new CollageImage(app_,isJava2_,downloaded_image);
+        downloaded_image = null; 
+        num_of_downloads++;
+        notify();
+        return collage_image;
+    }
+    else{
+        if ((tracker_.statusAll(false) & MediaTracker.ERRORED) != 0){
+        //System.out.println(downloaded_image.name_);
+        downloaded_image = null;
+        num_of_downloads++;
+        notify();
+        return null;
+        }
+    }
+    
+    return null;
 
     }
@@ -155 +163 @@
     }
 
-    private CollageImage process(ImageUrlTriple iutriple){
-            Image image     = iutriple.image();
-        String from_url = iutriple.urlString();
-        String img_name = iutriple.name();
-        URL url =  iutriple.url();
-        
-        CollageImage collage_image = new CollageImage(image,url,from_url,img_name);
-
-        image = collage_image.image_;
-        // images x and y dimensions
-        int image_x_dim = image.getWidth(app_);
-        int image_y_dim = image.getHeight(app_);
-
-        if ((image_x_dim>0) && (image_y_dim>0))
-        {
-        collage_image.setDimensions(image_x_dim,image_y_dim);
-        
-        // places and sizes the image
-        MyAffineTransform af = new MyAffineTransform(image_x_dim,image_y_dim);
-        
-        // sets location & size of collage image
-        collage_image.setAffineTransform(af, isJava2_);
-        
-         if (isJava2_ ) {
-            collage_image.image_ 
-            = restoreAlpha(collage_image.image_, 0, 0, 
-                       collage_image.image_x_dim_, collage_image.image_y_dim_); 
-            
-        }
-            
-            
-        }
-     
-        collage_image.fresh = false;
-        return collage_image;
-    }
-
-  /** Resets the alpha channel of an image so that it appears solid
-     *
-     *  @param img the image to restore
-     *  @param x the x co-ordinate of the image
-     *  @param y the y co-ordinate of the image
-     *  @param w the width of the image
-     *  @param h the height of the image */
-    public Image restoreAlpha(Image img, int x, int y, int w, int h) {
-      
-    // declare an array to hold the pixels
-    int[] pixels = new int[w * h];
-    
-    // get the pixels of the image into the pixels array
-    PixelGrabber pg = new PixelGrabber(img, x, y, w, h, pixels, 0, w);
-       
-    try {
-        System.err.println("  grab pixels....");
-        pg.grabPixels();
-        System.err.println("  got pixels");
-    } catch (InterruptedException e) {
-        System.err.println("interrupted waiting for pixels!");
-        return img;
-    }
-
-      
-    // check for any failures
-    if ((pg.getStatus() & ImageObserver.ABORT) != 0) {
-        System.err.println(" image fetch aborted or errored");
-        return img;
-    }
-
-    // loop through every pixel in the picture and handle it
-       for (int j = 0; j < h; j++) {
-           for (int i = 0; i < w; i++) {
-           pixels[j * w + i] |= (255 << 24) & 0xff000000;
-           }
-       }
-       
-       // set the pixels of the whole picture to the pixels array
-       pg.setPixels(0, 0, w, h, pg.getColorModel(), pixels, 0, w);
-       // create the new image and return it
-       return( app_.createImage(new MemoryImageSource(w, h, pixels, 0, w)) );
-      
-    
-       
-       
-    }
-
-
+ 
 }