Changeset 11562 for trunk/gsdl

Timestamp:

2006-04-03T09:57:56+12:00 (18 years ago)

Author:

shaoqun

Message:

changed code handling threads

File:

• trunk/gsdl/src/java/org/nzdl/gsdl/GsdlCollageApplet/DisplayImages.java (modified) (26 diffs)

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

@@ -61 +61 @@
 
     /** Holds images currently on display in the applet */
+    protected  Vector inuse_ready_    = null;
+
+    /** Holds images currently on display in the applet */
     protected Vector inuse_    = null;
-
+    
     /** Holds previously displayed images for re-use */
     protected Vector notinuse_ = null;
@@ -70 +73 @@
     protected Image    finished_buffer_  = null;
     protected Graphics finished_graphic_ = null;
-
+ 
+    Thread next_frame_ ;
+
+    String dots[] = new String[]{" ",".","..","...","....",".....","......"};
+    int dots_nums=0;
+    boolean start_paint = false;
     /** Used to determine where to place new images on the applet to optimize
      *  whitespace coverage <br>
@@ -95 +103 @@
      *  @param is_java2 whether advanced image processing techniques should be used
      *  @param bgcolor the background colour of the applet screen */
-    public DisplayImages(GsdlCollageApplet app, 
-             DownloadImages download_images, boolean is_java2, Color bgcolor)
+    public DisplayImages(GsdlCollageApplet app, DownloadImages download_images,
+             boolean is_java2, Color bgcolor)
     {
     super("DisplayImages");
@@ -102 +110 @@
     // parameters saved locally
     app_             = app;
-    download_images_ = download_images;
     is_java2_        = is_java2;
     bgcolor_         = bgcolor;
 
     inuse_    = new Vector();
+        inuse_ready_   = new Vector();  
     notinuse_ = new Vector();
-
+    download_images_ = download_images;
     // sets width and height
     if (is_java2_)
@@ -136 +144 @@
         used_space[n][m] = 0;
 
+        next_frame_ =  new Thread(new Runnable(){
+                public void run() {
+            try {
+
+            Thread curr_thread = Thread.currentThread();
+        
+            while (curr_thread == next_frame_) {
+                next_frame();
+                
+                Thread.sleep(app_. refreshDelay_);
+                curr_thread = Thread.currentThread();
+            }
+
+        
+            } catch (Exception e) {
+            e.printStackTrace();
+            }
+        }
+
+
+        });
+
+       next_frame_.start();
+
+
     }
 
@@ -142 +175 @@
      *  @param y the y co-ordinate of the mouse
      *  @return the image that the user has clicked on or null if the user has clicked whitespace */
- 
    public synchronized CollageImage clickedOnImage(int x, int y)
     {
@@ -177 +209 @@
      *  images will be removed once there are greater than 25 images onscreen, to ensure
      *  the applet cannot be overloaded. */
-    public synchronized void display_collage() 
+    public  void display_collage() 
     {
-    // get the number of images currently in the collage
+
+        // get the number of images currently in the collage
     final int no_images = inuse_.size();
+    
 
     // if there is nothing new to add
@@ -187 +221 @@
     
     // otherwise need to re-generate images
-    if (app_.verbosity() > 3)
+    if (app_.verbosity() >= 2)
     {
-        System.err.print("Regenerating images:");
+        System.err.println("Regenerating images: " +no_images);
     }
     
     // get each image currently onscreen inturn
-    for (int i=0; i<no_images; i++)
+    for (int i=0; i<inuse_.size(); i++)
     {
         CollageImage collage_image = (CollageImage)inuse_.elementAt(i);
-
+       
         Image image = collage_image.image_;
         // images x and y dimensions
@@ -202 +236 @@
         int image_y_dim = image.getHeight(app_);
 
-        int status = app_.checkImage(image,app_);
+        //int status = app_.checkImage(image,app_);
 
         if ((image_x_dim>0) && (image_y_dim>0))
@@ -214 +248 @@
             // 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, is_java2_);
             
-            if (is_java2_) {
+             if (is_java2_) {
                 collage_image.image_ 
-                = restoreAlpha(collage_image.image_, 0, 0, 
+                 = restoreAlpha(collage_image.image_, 0, 0, 
                            collage_image.image_x_dim_, collage_image.image_y_dim_); 
+               
             }
             
@@ -230 +265 @@
         if (is_java2_)
         {
+              
+ 
             // conducts fading and colouring of image
             Image img = handlepixels(collage_image.image_, 0, 0, collage_image.image_x_dim_, 
-                         collage_image.image_y_dim_, i, collage_image.fresh ); 
+                        collage_image.image_y_dim_, i, collage_image.fresh ); 
             collage_image.image_ = img;
-           
-        }
+        
+ 
+        }
+
         if (collage_image.fresh) {
             collage_image.fresh = false;
@@ -255 +294 @@
     }
 
-    /** loops through removing oldest images and reduces number of images if excessive overlap is occuring */
-    synchronized void remove_old_images() {
-
+
+ /** loops through removing oldest images and reduces number of images if excessive overlap is occuring */
+    void remove_old_images() {
+   
     // loops through removing oldest images that have almost faded completely
     // and restricting the size of a simple collage to 25 images
@@ -272 +312 @@
 
             CollageImage removed_image = (CollageImage)inuse_.elementAt(i);
-            inuse_.removeElementAt(i);
+            inuse_.remove(i);
 
             // restores alpha channel to represent a solid image
@@ -301 +341 @@
 
             CollageImage removed_image = (CollageImage)inuse_.elementAt(i);
-            inuse_.removeElementAt(i);
+            inuse_.remove(i);
 
             // indicates space for this image is no longer used
@@ -321 +361 @@
         }
     }
-
-    }
-
+     
+     
+    }
+
+  
     /** Alters the images currently on display in the applet <br>
      *  Changes are prioritised in the following way:
@@ -334 +376 @@
      *  Then the collage is asked to display and repaint with the new image set. */
 
-    synchronized void next_frame()
+     public  void next_frame()
     {
     double random = Math.random();
-    
-    // if there is a new image in the downloaded vector
-    if (download_images_.size()>0)
-    {
-        int position = (int) ((download_images_.size() - 1) * random);
-
-        // get the image and its associated url (and remove from download area)
-        DownloadImages.ImageUrlTriple iutriple = download_images_.retrieve(position);
-        Image image     = iutriple.image();
-        String from_url = iutriple.url();
-        String img_name = iutriple.name();
-
-        // prepare the image for collaging
-        // app_.prepareImage(image,app_);
-        CollageImage collage_image = new CollageImage(image,from_url,img_name);
-        
-        // add it to the vector of images currently in use
-        inuse_.addElement(collage_image);       
-        
-        if (app_.verbosity()>=1)
+              
+
+    if (inuse_ready_.size() > 0){
+        int pos = (int) ((inuse_ready_.size() - 1) * random);
+        inuse_.addElement(inuse_ready_.remove(pos));
+    }
+        else if (notinuse_.size()>0)
         {
-        System.err.println("Adding in a newly downloaded image");
-        if (app_.verbosity()>=2)
+        int position = (int) ((notinuse_.size() - 1) * random);
+        Image image;
+        
+        CollageImage collage_image = (CollageImage)notinuse_.elementAt(position);
+        notinuse_.remove(position);
+        inuse_.addElement(collage_image);
+        
+        if (app_.verbosity()>3)
             {
-            System.err.println("  name="+img_name+", url="+from_url);
+            System.err.println("Re-using an image not on screen");
             }
-
-        }
-    }
-    // use an image that has already been displayed but is no longer in the collage
-    else if (notinuse_.size()>0)
-    {
-        int position = (int) ((notinuse_.size() - 1) * random);
-        Image image;
-
-        CollageImage collage_image = (CollageImage)notinuse_.elementAt(position);
-        notinuse_.removeElementAt(position);
-        inuse_.addElement(collage_image);
-
-        if (app_.verbosity()>3)
-        {
-        System.err.println("Re-using an image not on screen");
-        }
-    }
+        }
     // otherwise repaint the first image as the last image
     else if (inuse_.size() > 0){
@@ -393 +411 @@
         removed_image.fresh = true;
         
-        if (is_java2_) {
+         if (is_java2_) {
         removed_image.image_ = restoreAlpha(removed_image.image_, 0, 0, 
                             removed_image.image_x_dim_, removed_image.image_y_dim_); 
@@ -399 +417 @@
         
         notinuse_.addElement(removed_image);
-        inuse_.removeElementAt(0);
-        
+        inuse_.remove(0);
         if (app_.verbosity()>=4){
         System.err.println("Removing oldest image");
@@ -409 +426 @@
         System.err.println("No images in download area");
     }
-    
-    display_collage();
+          display_collage();
+    
     }
     
@@ -493 +510 @@
      *  @param fresh whether the image is being processed for the first time */
 
-    public synchronized Image handlepixels(Image img, int x, int y, int w, int h, int p, boolean fresh) {
+    public  Image handlepixels(Image img, int x, int y, int w, int h, int p, boolean fresh) {
     
     // declare an array to hold the pixels
@@ -606 +623 @@
      *  @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];
@@ -612 +629 @@
     // get the pixels of the image into the pixels array
     PixelGrabber pg = new PixelGrabber(img, x, y, w, h, pixels, 0, w);
+
     try {
+      
         pg.grabPixels();
-    
+          
     } catch (InterruptedException e) {
         System.err.println("interrupted waiting for pixels!");
         return img;
     }
+
+      
     // check for any failures
     if ((pg.getStatus() & ImageObserver.ABORT) != 0) {
@@ -649 +670 @@
      *  @param h the height of the image */
     public boolean checkFaded (Image img, int x, int y, int w, int h) {
-
      if (w == 0 || h == 0) 
          return false;
@@ -682 +702 @@
 
     /** Paints the applet on the screen */
-    public synchronized void paint(Graphics g)
+    public void paint(Graphics g)
     {
+
     screen_graphic_.setColor(bgcolor_);
     screen_graphic_.fillRect(0,0,app_x_dim_,app_y_dim_);
-    
-    int n = inuse_.size();
-    
+
     // get each image currently onscreen inturn
-    for (int i=0; i < n; i++)
+    
+    for (int i=0; i < inuse_.size(); i++)
         {
-        CollageImage collage_image = (CollageImage)inuse_.elementAt(i);
-        // don't paint new images yet
+          
+            CollageImage collage_image =null;
+           try{
+           collage_image = (CollageImage)inuse_.elementAt(i);
+           start_paint = true;
+        }
+            catch(Exception e){
+          System.out.println("exception in paint");                 
+              break;
+         }
+       // don't paint new images yet
         if (collage_image.fresh) {
-            if (app_.verbosity()>3) {
-            System.err.println("doing nothing... image " + i + " of "+n+ " images in use is fresh.");
-            }
+          if (app_.verbosity()>=1) {
+            System.err.println("doing nothing...  images in use is fresh.");
+           }
         }
 
         // advanced image processing may be used
-        //      else if (is_java2_) {
-        else if (false) {
-            // the alphacomposite controls the blending of these two images.
+        else if (is_java2_) {
+          
+            //the alphacomposite controls the blending of these two images.
             Graphics2D sg2d = (Graphics2D)screen_graphic_;
-            //sg2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
+            sg2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
             sg2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
                           RenderingHints.VALUE_ANTIALIAS_ON); 
             collage_image.expand();
             sg2d.drawImage(collage_image.image_, collage_image.af_, app_);
-            }
+           }
         // simple image collage
         else
             {
             // add the image to the collage
+            
             screen_graphic_.drawImage(collage_image.image_, 
                           collage_image.xl_, collage_image.yt_,
@@ -720 +750 @@
                           0,0,collage_image.image_x_dim_-1,
                           collage_image.image_y_dim_-1,  app_);
-       
-            }
-        
-        
+            }
+    
         }
     
@@ -729 +757 @@
     finished_graphic_.drawImage(screen_buffer_,0,0,app_);
     
+
     if (finished_buffer_ != null)
         {
         g.drawImage(finished_buffer_, 0, 0, app_);
-        }
+        if (!start_paint){
+            g.setColor(Color.white);
+            g.setFont(new Font("font",Font.PLAIN+Font.BOLD,30));
+            g.drawString("Downloading" + dots[(dots_nums++)%dots.length],app_x_dim_/3-20,app_y_dim_/2-2);
+        }
+        }
+    
+
     }
 
     /** Runs display thread by repeatedly calling the next frame,
      *  waiting for a specified delay period between calls */
-    public void run() 
-    {
+    public void run() {
     try {
-
-        System.err.println("Running display thread");
-
+        
         Thread curr_thread = Thread.currentThread();
         
-        //long tm = System.currentTimeMillis();
-    
         while (curr_thread == this) {
-        next_frame();
-        //tm += app_.refreshDelay();
-        //Thread.sleep(Math.max(0, tm - System.currentTimeMillis()));
-        Thread.sleep(app_.refreshDelay());
-        //Thread.sleep(2);
-        curr_thread = Thread.currentThread();
-        }
-
-        System.err.println("Display thread finished");
+        CollageImage collage_image  = download_images_.getCollageImage();
+            if (collage_image !=null){
+                inuse_ready_.addElement(collage_image); 
+            }
+            else{
+                break;
+            }
+           curr_thread = Thread.currentThread();
+        }
+
+       
         
     } catch (Exception e) {
-        e.printStackTrace();
-    }
-    }
+        //e.printStackTrace();
+           System.out.println("Display images thread is interrupted");
+    }
+
+    System.out.println("Display images thread stoped");
+          
+    }
+
 }