Transparency applet

In the HTML page, in a <table>, I've inserted an applet.
In the <TABLE> tag, there is a background image.
Is it possible to see this background image ( perhaps by setting a transparency attribute of the applet ) as abckground of the applet ?
Thanks a lot.

This question has been asked over and over again and no real solution has been found (other than having the applet drawing the background image).

Similar Messages

How to make a transparent java applet?

is it possible to make a transparent applet?

No. But consider making the applet paint a background that matches (in colour and texture) the background of the web page in which it's being displayed.

Is there any way?-transparency in an applet

Hi:-)
I want smooth alpha-fading for a Rectangle or
an Image to work in not! JavaPlugin-updated Browsers.
For now the transparency looks bad.(points and crosses)
In the appletviewer it works fine.
Is there any solution to make my applet working in standard VM's?
How can I check my applets (made with Forte3.0) if they're running on VM's used by IE5.5 and Netscape 4.7 or earlier versions of browsers?
I need this for compability-reasons on my homepage.
I tried for about a week, night and day, to find any solution. I want to use Java, because I'm a fan of it.
But still I don't know what graphical effects I can use
in an applet, being sure that everbody can view it,
even without JavaPlugin.
For any hint I fall on my knies and kiss your feeds;-)
edgar

Is there any solution to make my applet working in standard VM's?You call those 1.1-thingys standard VM's?
You could make your own blending routines using the java.awt.image classes PixelGrabber and MemoryImageSource, you know...
How can I check my applets (made with Forte3.0) if
they're running on VM's used by IE5.5 and Netscape
4.7 or earlier versions of browsers?There's a system property called "java.version" - if you find that it compares to less than 1.2 you can be sure that it is being run by an ancient VM.
But still I don't know what graphical effects I can use
in an applet, being sure that everbody can view it,
even without JavaPlugin.Here's something small:
http://www.cfxweb.net/javapage.php?page=applets.shtml
http://www.cfxweb.net/javapage.php?page=demos.shtml
http://www.cfxweb.net/javapage.php?page=contest.shtml

Xfce4-goodies applets and transparency

Certain applets from the xfce4-goodies group (cpufreq, cpugraph, diskperf) don't seem to respect panel transparency:
Is there any solution to this?

The transparency options are only shown if you have some kind of compositing (like compiz or the built-in xfce one) enabled.
[edit] AFAIK the panel doesn't support pseudo-transparency (anymore?).
Quoting one of the xfce devs at http://forum.xfce.org/viewtopic.php?pid=20223#p20223 :
I don't see the point of fake transpaceny, it involves quite a bit of code for IMHO "just not it". You want a transparent panel: enable compositing.
Last edited by Danylo (2012-03-25 16:30:23)

Transparency problem with animated gif within AJAX overlay

Hello all,
I have designed and animated a loading spinner in Photoshop CS3, which needs to sit within an Ajax overlay, with transparency set to 75.
I tried exporting the spinner as an animated gif with a transparent background (using Save for Web), but it gave the animation a pixelated outside edge. Does anybody know how to remedy this?
As the Ajax overlay is semi-transparent, I tried exporting the animated gif with a black background and transparency set to 75%. I ticked the transparency box in the export window, but once it is loading in the Ajax it doesn't seem to be transparent (see here: http://www.chrisgartside.co.uk/flash/Screenshot.jpg)
Any help is very much appreciated.
Best wishes,
ruth.

I forgot to mention that the Ajax pop-up is fired up from a Flash gaming applet.
Thanks very much in advance.
ruth.

How do you close a dragged applet, as Stage.close() doesn't work?

I'm trying to implement a close button in a draggable applet, but Stage.close() doesn't work, and there's an odd little "X" icon which is causing me problems...
My starting point and example is the simple draggable applet from the API documentation. It's the code listed under "User-Specified Close Example":
http://java.sun.com/javafx/1.2/docs/api/javafx.stage/javafx.stage.AppletStageExtension.html
import javafx.scene.*;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.*;
import javafx.scene.shape.*;
import javafx.scene.text.*;
import javafx.stage.*;
var textContent = "Click the box to return to the browser";
var outside: Boolean = false;
var s: Stage = Stage {
    title: "AppDeploy Demo"
    width : 300 height : 200
    style: StageStyle.TRANSPARENT
    opacity: 0.5
    scene : Scene {
            content: [
                Text { content: bind textContent
                       x: 25 y:35 fill: Color.BLACK
                       font: Font{size: 24}
                Rectangle { x: 100 y: 100 width: 100 height: 100 fill: Color.RED
                            onMouseClicked: function(e: MouseEvent): Void {
                                s.close();
    extensions: [
        AppletStageExtension {
            shouldDragStart: function(e: MouseEvent): Boolean {
                return e.shiftDown and e.primaryButtonDown;
            useDefaultClose: false
}However, the Stage.close() function in the user code doesn't seem to close the applet once it's dragged. It seems this can only be achieved by a mysterious little "X" in a box top right, acting as a close button.
Here's a demonstration of the problem once you've compiled that code:
1. Open browser with applet (I'm using IE8 on Windows XP)
2. Shift-drag the applet out of the browser. Notice the little X in a box appears when you drop the applet on the desktop.
3. Click the red rectangle to invoke the Stage.close() function in the user code.
4. Applet disappears from screen and does not reappear in the browser.
5. But minimising all the icons on the desktop shows the little X in a box is still there sitting on your desktop (actually I find the X has gone, but the box is still there). This suggests the applet is still running.
6. Close the browser. The little X's box is still on the desktop.
7. After a short pause a Java dialog box appears: "Desktop integration warning. The application would like to create shortcuts. Do you want to continue? OK/Skip" The applet wasn't closed, it is still running!
8. Click Skip. Dialog box disappears. But the little X's box is still on the desktop. Is the applet still running?
9. Try to recompile app again into a deployable Jar (I'm using Eclipse for this).
10. The compiler stops with "ERROR: Jar file C:\[...].jar could not be deleted. The Jar is probably locked by running application, Web browser, emulator or antivirus. Please check that all windows related to the application have been closed." Yes, the applet Jar is still being used.
11. Minimise all the windows. The little X's box is still on the desktop.
12. Click the little X's box.
13. After a few seconds the box disappears. Does this mean the applet is no longer in use...?
14. Recompile the app again into a deployable Jar. It works!
By the way, you get the same experience with another Sun sample: the DraggableMP3Player at
http://javafx.com/samples/DraggableMP3Player/index.html
That, too, thinks it's implementing it's own close button, and again the same problem occurs.
So it seems Stage.close() doesn't properly close the applet, and only the the little X in a box will do this.
I'd like to be able to really close the applet from my own code. How can I do this?
Many thanks
Nik
Edited by: nik.silver on Aug 6, 2009 12:48 PM

After double tap home button, swipe up on the app card that appears above the icon.

Swing applet looks different in browser than in applet viewer

I'm developing an applet using Net Beans 5.0. When I run the applet in the applet viewer I get a totally different look and feel than when I run the applet in a web broser. The background colors are different, the buttons are a totally different style and color, and some buttons that show up essentially transparent in the applet viewer are totally opaque in the browser.
The applet viewer is the one that looks like the interface that I designed in the Net Beans GUI builder, so can anyone tell me how I make it look the same in a Web Browser?

It looks like you're right, so how do I ensure that
my applet will look the same on different versions of
JVM? There's got to be a way, right??yes. you should look into javas pluggable look and feel system.
the cross-platform (java) look and feel changed dramatically between versions 1.3, 1.4, and 1.5.
however, if you use another look and feel, such as motif, or perhaps your system's look and feel (windows, mac, etc), the program should look pretty much the same (perhaps a little different, but not like the differences in the Java look and feel).
if you want to be COMPLETELY sure that they will always look the same, select a third party look and feel that comes packaged in a jar file that you are free to distribute with your applet.
Some good third party look and feels are JGoodies Plastic, and Incors Alloy. And there are others.
if you use one of those, it should look pretty well the same on all platforms, and in all JVM's.
- Adam

ImageIO, Timers, Transparency and a Rant

Hi all,
<BEGIN RANT>
After years of writing games and programming next-gen consoles, I foolishly decided to write a few online java games. Like many, I chose Java because it is very similar to c++ and accessible cross-platform on web pages by the masses with no extra downloads required (btw, I'm not using j3d for this reason). Instead I've found it to be nothing but a burden.
Today's gripes are below. If I sound like I'm having a rant, well, adter fighting it all this week, I am!. Any help/suggestions/discussions are most appreciated. I'm currently using j2sdk 1.4.1_02.
1) why can't I enable hardware accleration (currently transparency sucks on the framerate) without requiring permissions? What exactly am I going to do with it to make it a security risk?
2) Why doesn't Java (without j3d or any other extensions) support the high-resolution timer? Such a basic issue that has been plaguing these forums for years. It seems i can't even do a work around as using JNI requires permissions and an external module on the users machine so I can't do this from an APPLET without signing and installing something. Sure, I could just about use 15ms on w2k and make win98 users suffer 20fps with the 50ms res timer. I tried (and succeeded) using my own timers but that means I can't sleep (as sleep>0 will sleep for at least the timer resolution) so my cpu usage is on 99%. And it destroyed my win98 machine :-)
3) Has anyone had problems with ImageIO.read in an applet? I find that occasionally when reading an image from my web server, it reads it twice (I guess it found an error and re-requests it) and corrupts the image. At first I thought it was my php corrupting the image, but it does it on direct accesses as well. Toolkit.createImage does not seem to have this problem (but then I have to wait for it to load (currently i construct a cursor with the image which seems to sort it) and then paste it to BufferedImage rather than the inaccessible image type returned by toolkit). Toolkit does however have the advantage that I can use extensionless image files and prevent caching though which ImageIO.read seems unable to handle (it usually loses the palette of gifs etc without the extension hint). My web server is apache 2.0.45 on Win2K btw.
These issues concern APPLETS. If i wanted to write an application, I would use C++ and OpenGL with very little extra work required for each specific platform (I'd only support PC, Mac and x86 based linux anyway). The point is that i want it embedded on a web page, and I don't want the user to have to install anything other than the Java VM.
What about the rest of you?
What are your experiences with Java? Good? Bad?
Do you guys think there is any future for it?
Does Java 1.5 have anything to offer?
IF it comes down to it, and I NEED to sign my code and INSTALL code then I will just abandon Java altogether and just stick to windoze users (It will take a fraction of the development time and be far less painful for me to use ActiveX or .net).
Oh, and if you're just going to reply and say something like "I think Java's the bestest thing ever, it's so much better and cooler than C++ and all my friends think so too. Cos my teacher says so" then don't waste my time.
If you have games experience and know what you're on about then I'd love to hear your views.
<END RANT>
Cheers
-Simon

Hi Paul,
Thanks for your views.
Badly because it provides the security protections it
says it does?No, I mostly appreciate the security but some things seem a little too secure. For example, I want to use hardware acceleration for my translucencies but Java won't let me....
You can always ask users to change the permissions
your applet runs under, I guess, assuming the browser
support it. But at that point, why not just write
your game in C++ and tell people to download it and
run it normally?
If you're trying to write a Quake clone in java and
distribute it as an applet...don't bother.The point is that I don't want to do this. I want ppl to have to visit the web site to play the game without having to grant permissions or install anything or agree to run signed code (not just for advertising purposes but also as some of the games will be multiplayer). This is why I'm using Java and not activeX or .net.
I am perfectly capable of writing any genre of game to be cross platform in C++ (if I use OpenGL then I only need a thin platform-specific wrapper and I just compile it for my required targets - PC, Mac, x86 Linux), and I really don't see the point in attempting it as a Java application. The games I'm currently doing for my website in Java are simple 2d games suitable as applets. The main problem I'm having is that I need to sleep to free up the cpu, but the low-res timer resolution means that I can only run at 20fps on win98 when sleeping. Yes it runs ok, but by no means as smooth as I'd like.
I think java may be used in action gaming once it's
embedded into an environment that really supports it
(e.g., as a well-supported programming environment for
PlayStation 2) (and somehow I doubt that OpenGL
bindings for java will work as a gaming environment,
although that's just a hunch), and it's fine for
non-action games.Yes it can do the job, but the fact is that Java is and always will be slower than code compiled directly for the target CPU so this means my entire audience need to have higher spec machines to run it than I'd like. I would not write anything that is too CPU intensive in Java as there are also still a lot of low spec machines out there running win98 which I (unlike most ppl on these forums) am still willing to support.
Cheers
-Si

Flash Player linux, grey box issue (youtube vids and some applets do not display)

I posted this question on my distro-specific forum as well as linuxquestions.org, however it appears to be a unique problem, so here it is:
When viewing videos on youtube.com, most other websites, and when trying to run certain flash games, the flash applet will not display (though the audio will play). Instead of displaying the flash applet, there will be a grey box where the flash video or applet would normally be.
This problem occurs on Firefox and Chromium, but not on Opera.
My Specs are as follows:
Distro: PCLinuxOS 2010 (32-bit)
flash-player-plugin: 10.1-2pclos2010
firefox: 3.6.6-1pclos2010
swfdec has never been installed (to my knowledge)
I did a lot of investigating about the problem but have turned up no solutions thus far. Here are my results.
Flash videos and applets which allow access to the settings menu (like youtube played from their website) do not display, however flash videos and applets which do NOT allow access to the settings menu (including youtube videos embedded in other websites) WILL display.
Reinstalling flash-player-plugin and firefox through synaptic does not solve the problem (though note that PCLOS works with rpm files, not deb files. apt4rpm does not support the remove --purge operation, however reinstalls are said to overwrite custom configs with stock ones.)
Creating a new firefox profile and/or starting FFox in safe-mode does not solve the problem
Creating another user and running FFox from that user will properly display flash videos
Comparing default plugins between my main user and new user shows that there is no difference. So this likely rules out a defective extension or plugin binary.
Deleting ~/tmp/plugtmp* folders when FFox is closed does not solve the problem.
Removing the ~/.macromedia and ~/.adobe folders does not solve the problem. (have checked permissions between the new test user and main user, and they are equivalent)
Downloading libflashplayer.so from the Adobe website and copying it to /usr/lib/mozilla/plugins has no effect on the problem.
I'm thinking that there might be somewhere else that flash stores configurations for my user, and that maybe the settings there are corrupted and would need to be purged. However frantic googling has turned up nothing useful so far.
Does anyone have any suggestions for me?

The problem, at least in my case, was QtCurve's opacity. If I have opacity set to less than 100%, flash would not display for sites like Youtube and Vimeo, but worked elsewhere.
The solution for me was to go into qtcurve's settings, and put npviewer.bin in the application exceptions section for window and menu opacity. Doing that, I was able to keep my transparent menus, and also use flash everywhere.
You can find out what the application name is by launching your browser of choice in a terminal with qtcurve debug turned on, like so:
QTCURVE_DEBUG=1 firefox
If you watch through the lines that start with "QtCurve" you'll see "Application name". Look for the one that shows up when you try to load a video. In my case it was npviewer.bin. In yours, it might be nspluginviewer or something else. If you add an exception for that specific application, you'll fix your problem without having to compromise on your theme.

Please HELP !!! Signed Applet & Java Media Framework(JMF)

Hi,
I have written a self signed applet that is used for Recording voice running in browser:
The tag that I've given is as follows:
<OBJECT
classid = "clsid:CAFEEFAC-0014-0001-0000-ABCDEFFEDCBA"
id="recordApplet"
codebase = "http://java.sun.com/products/plugin/autodl/jinstall-1_4_1-windows-i586.cab#Version=1,4,1,0"
WIDTH = 268 HEIGHT = 27>
<PARAM NAME = CODE VALUE = "RecWindow">
<PARAM NAME = ARCHIVE VALUE = "jmf.jar,sound.jar,SignedRecWindow.jar">
<PARAM NAME = "soundtrack" VALUE="testFile.mp3">
<PARAM NAME = "type" VALUE = "application/x-java-applet;jpi-version=1.4.1">
<PARAM NAME = "scriptable" VALUE = "true">
<PARAM NAME = "MAYSCRIPT" VALUE = "true">
</OBJECT>
I've also signed jmf.jar as well as sound.jar that come in JMF 2.1 and am including it the archive. These jars are downloaded on client machine.
My code works perfectly BUT only when JMF 2.1 is installed on the clients machine else I get a RunTime Exception stating "no permission to capture from applet".
JMF FAQ states that If a user chooses to allow playing back locally stored media files or saving media files locally, he/she can do so by making use of a policy file. http://java.sun.com/products/java-media/jmf/2.1.1/faq-jmf.html#jmf2-applet-run
My requirement is that once the user has agreed to the signed applet to run then there should be no need to install JMF rather use the jmf.jar that is downloaded on client machine.
Also how can I grant the permission (permission javax.sound.sampled.AudioPermission "record";) to my applet in client computers ?
The client should not be asked to add any files (policy) by itself, all must be transparent for him.
Thanks in advance.
Vipin.

I too have been trying to get Java JMF sound recording to work via webstart. No luck so far.
I even tried playing (security.AllPermissions) with .java.policy file in the user's home directory and even modifying java.policy in the JRE/lib/security directory. No luck there too!
I also added security.AllPermissions to the javaws.policy in the JRE/jawas/javaws.policy file. Still no luck!
Any idea, anyone?

Problems running applet in web.

Im trying to publish a game made using applet. The server runs normally, and the client shall be accessed by browser. I've already signed the applet, which was being required. Im running the server under linux ( ubuntu ), and the Jar file have read permissions. BUT, trying to run the applet in a machine out of the server, it shows me the error "java.net.ConnectException: Connection refused: connect", when trying to connect to the game, even being the server running and waiting connections. The server runs below a transparent proxy which i dont have permissions to access directly. Running the applet on the AppletViewer in eclipse, the game runs normally with no problems.. Would the problem be about the proxy blocking net connections to the game? It seems to me that its some Java feature, cause the error comes from Java. Could someone help me? Its driving me nuts..
Thanks guys.

From the API:
ConnectException extends SocketException
Signals that an error occurred while attempting to connect a socket to a remote address and port. Typically, the connection was refused remotely (e.g., no process is listening on the remote address/port).

Png images not shown in applet when opened in internet explorer

hi all,
I am using some transparent PNG images in my applet . Its working properly in appletviewer as well as netscape but images just disappear in internet explorer.
same image appears in internet explorer but not in applet in internet explorer.
can anybody help me ?
thanks

The java version that IE has doesn't have support for PNG, only gif and jpeg.

Strange problem in applet application

Hello Everybody,
I hava an applet whit an image. This image has to changed by color, and text has to be added to the image. The text color is also changable. Here is where it goes wrong.
When I change the background color of the applet, the transparant image will be colored. This is good.
At the start text can be added.
When you change the textcolor, the frame with the JColorChooser will get at the background of the image, like this:
[http://schaftwagen.ncamade.nl/schaftwagenfout.png|http://schaftwagen.ncamade.nl/schaftwagenfout.png] (image)
When you change the text with the "opschrift" button (vertical text) the old text stays under the new text.
When you change the background after this, everything seems to be okay.
At an other forum I've asked this question, and some of that people didn't had this "problem". I am using Windows 7RC with the newest java version. Tested it on an Windows vista and Windows XP all with the same problem.
The source is to big for this forum and can be found at [http://www.dreamincode.net/forums/showtopic117029.htm|http://www.dreamincode.net/forums/showtopic117029.htm]. This is the other forum, where I've asked about his issue. (I hope this link isn't against the rules to post this link to the other forum?)
I hope someone can help me with this problem. The applet can be tested here: [http://schaftwagen.ncamade.nl/colorchooser.asp|http://schaftwagen.ncamade.nl/colorchooser.asp]
Greats,
C.H.F.S.
Edited by: C.H.F.S. on Jul 28, 2009 4:01 AM

I've just tested it on different boxes, and sometimes it does work indeed, but sometimes other problems come up. On one the background color doesn't change but the text color does it right and changing the text work also correctly in that case.
Can anyone help me please solving this strange problem?

Making a button transparent

I'm designing a Japplet with JButton but i dont know how to make my buttons background transparent
i read the color class tutorial but i actualy didnt understand it
it gives lots of values like fload arrays or something
can somebody tell me how can i make my buttons background transparent?
Thanks

It's always good to send an example as you finally did.
That helps to find a solution:
package applet;
import javax.swing.*;
import java.awt.*;
public class backgammon extends JApplet{
    public Icon pulicon,bgIcon;
    private Image pul_s,background;
    public JButton b1;
    public void init(){
        //set layout:
        getContentPane().setLayout(null);
        this.setSize(744, 536);
        //set button:
        pul_s = getImage(getCodeBase(),"images/pul_sari.gif");
        pulicon = new ImageIcon(pul_s);
        b1 = new JButton(pulicon);
        b1.setBounds(50,50,42,42);
        b1.setContentAreaFilled(false);
        b1.setBorderPainted(false);
        getContentPane().add(b1);
        //set background:
        background = getImage(getCodeBase(),"images/background.jpg");
        bgIcon = new ImageIcon(background);
        JLabel bg = new JLabel(bgIcon);
        bg.setBounds(0,0,getWidth(),getHeight());
        getContentPane().add(bg);
}

A problem changing applet's background colour

Hi there,
I'm hoping somebody can help me with what I believe to be a problem I have in changing the background colour of an applet, the source code of which is posted below. If super.paint(g); is commented out, the background of the applet will be changed to whatever colour is specified, however if it is not the background will remain grey. As I understand though, super.paint(g); should be part of the program. What am I doing wrong? Should super.paint(g); in this example be part of the program?
Before posting this I searched the forums and looked at some of the Q's & A's about changing an applet's background colour but am non the wiser.
Thank you for your help.
Regards,
THE_TH1NG
import javax.swing.*;
import java.awt.Color;
import java.awt.Graphics;
public class Calculate extends JApplet
public Calculate()
//Variables used in our calculations.
double sum; // Add the two numbers
double product; // Multiply the two numbers
double quotient; // The first number divided by the second number
double difference; // The first number minus the second number - This may result in a negative value being returned
double userInput1; //Stores the first number as a double after being converted from type string
double userInput2; //Stores the second number as a double after being converted from type string
public void init()
String number1; // The first number to be entered by the user
String number2; // The second number to be entered by the user
number1 = JOptionPane.showInputDialog("Please enter the first floating point number"); // The user inputs the first number as a string
number2 = JOptionPane.showInputDialog("Please enter the second floating point number"); // The user inputs the second number as a string
// Convert the user's input from type string to type double
userInput1 = Double.parseDouble( number1 );
userInput2 = Double.parseDouble( number2 );
// Perform the calculations
sum = (userInput1 + userInput2);
product = (userInput1 * userInput2);
difference = (userInput1 - userInput2);
quotient = (userInput1 / userInput2);
public void paint( Graphics g )
//The applets background will be set to the desired colour if super.paint(g) is commented out
//But the background will remain grey if the code is not commented out.
//What am I doing wrong?
//super.paint( g );
setBackground(new Color(50,150,255)); //Light Blue
g.drawRect(10,10,250,100); // Draw a rectangle 250 pixels wide X 100 pixels high to enclose the rest of the program's output
//Dispaly the results of the calculations to the user
g.drawString( "The numbers entered are " + userInput1 + ", " + userInput2, 25, 25);
g.drawString( "The sum is " + sum, 25, 40);
g.drawString( "The product is " + product, 25, 55);
g.drawString( "The difference is " + difference, 25, 70);
g.drawString( "The quotient is " + quotient, 25, 85);

You could try defining
public void update(Graphics g) {
paint(g);
}That's the only difference I see between your code and my applet code. If that isn't it, you could try getContentPane().setBackground(...) but I don't know how that could make much difference (I would think that the content pane is transparent...)
Another possibility is that, if you're using Swing, you probably shouldn't be overriding paint() and should stick to the paintComponent() method or whatever is appropriate.

Transparency applet

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