I'm trying to write a silly little app using Java and AWT.
It simply runs and animates some shapes, so as a first step, I created a simple app that clears a canvas with fillRect every 50ms.
The problem is, my app flickers every now and then with the underlying window colour. Google is failing me when it comes to finding simple hello-world type examples of flicker-free animating AWT apps.
What would the skeletal code for something like this look like?
Have a look for double buffering code.
http://www.codeproject.com/KB/graphics/javadoublebuffer.aspx
Related
I've seen the usual way of taking a screenshot in Java where you use a Robot and a BufferedImage to take a screenshot. But is there a way of doing this without using Robot and BufferedImage?
Why?
I am working with JavaFX and I don't like mixing up AWT (Swing) and JavaFX.
Not a big problem, I know, but I would love to keep everything within one library.
I've also heard that Robot is a bit slow, but that's not the main reason.
EDIT: I would like to capture the whole screen and not just an area like a scene.
Thanks in advance :D
I have a paint program written in java with SWT. I am testing with SWTBot. My test case is to draw a picture on the canvas, capture the image of the canvas, and compare to the expected image.
The problem is that I can't find any way to move the mouse using the SWTBot. Apparently it only allows me to click the mouse. I want to
move to an x,y location
mouse down
move to another x,y location
mouse up
Any advice?
I've decided to stop using SWTBot. The functionality is very weak. It is designed for Eclipse apps, so it doesn't really support plain SWT apps very well. Although having direct access to the widgets is somewhat appealing, the requirement of running the test code in the app process is awkward.
I've decided to use Sikuli instead. It has pretty good API for both Java and Python. It seems to have more function and better support than SWTBot.
I wrote a Java application that uses the java.awt.Robot to take screen captures of the screen and was wondering if capturing a program using DirectX/OpenGL would be possible?
Each time I try to do this, I get a black screen
Don't know if this is really a solution but seems there's more possible ways to get the screenshot information using a "FrameGrabber" or some related class from JavaCV possibly: http://code.google.com/p/javacv/
Some of the final output shown on the screen could be calculated on a graphics card that has shaders set to act on the image data before it gets put into a display buffer for what's shown so it's possible some effects would be impossible to capture without an analog loopback (go from video out to video in on a capture card).
Related post How to take screenshots fast in Java?
OpenGL is a drawing API, not an all purpose interface to the graphics system. There were times, when taking screenshots with OpenGL was indeed possible through some dirty hacks. However recently I tried to re-implement this on modern OS to see if it still works, and no, it doesn't anymore.
Yes it is possible. But maybe only in limited circiumstances.
I've successfully captured the contents on OpenGL (jogl) windows on linux and windows using the Robot createScreenCapture.
Some specific information about the implementation that may be different for you:
The call to createScreenCapture was done from within the OpenGL
application.
The application used heavyweight GLCanvas
It used Java 6
Make sure you pass it the correct coordinates. You can get the screen coordinates to use from the GraphicsEnvironment
Uhh... a hard one ;o)
I had a try with some other screenshot utils and got a black screen, too. Looks like DirectX is passing the graphics directly to the monitor output. I am wondering if that could be accessed within a java application.
I want to make a transparent overlay for a foreign project to show live video. Sample of overlay is given in the image link below. In image you can see a overlay at right bottom corner showing face of a person, I also want to achieve same functionality using JMF to show face and then display the face in overlay using swing.
Sample Overley Imahe: http://www.ovostudios.com/images/vidsamsolo.jpg
Can someone help achieving this functionality?
If you're just starting the project and haven't actually got the JMF part up and running yet, then you might want to take a look at some alternatives before committing to it.
If you want to go ahead with Swing, to get the general overlay behaviour you want, you'll need to make use of Frame.setUndecorated() to turn off window borders and buttons, and Window.setAlwaysOnTop() to make sure the window stays on top of other windows. For the transparency, see this tutorial. However, I'm not sure whether transparency and video will work nicely together, so good luck!
You might also want to write a custom focus handler for the window so that it cannot be focused, although it is probably impossible for the overlay to be properly 'phantom' whereby clicks just pass through the overlay to the underlying desktop. That kind of behaviour might only be possible by using low-level graphics techniques i.e. by not creating a window at all, but by drawing directly onto the screen. That might require a native library.
I can't seem to find anybody who has done or posted something like this; Essentially I want to design my own UI in photoshop and then slice down the images to use it in a Java application. Essentially coding in the PSD file as the GUI. Is this possible? If so, can anybody lead me in the right direction?
I'm not sure what editor to use for this sort of stuff. I am using the Eclipse IDE and I know there is a Visual Editor but, I already have the actual design for every component in a PSD file. All I want to do is to start incorporating this into the application. Thanks.
It depends on how far your design goes. If you simply want to have normal Swing components on top of your image this is easy. Convert your PSD into (for example) PNG, create a custom JPanel subclass that loads the image and overwrite the paintComponent() method to draw the image instead of the normal background. All child components can then be set to be transparent with setOpaque(false). This puts your image into the background and puts the components float on top of it.
If you want to change how individual components look, its a lot more work. You basically need to implement a new Look&Feel for Swing. I wouldn't recommend going that route, unless you really have to, we are talking about weeks of work here, and it requires a lot of testing to really make it work properly on all platforms.
Alternately, there are already tons of custom Look&Feels available, I suggest you take a look at some freely available ones (just google "java look and feel"). Many of them can be customized to some degree (how much depends on the actual implementation, so take a close look at the source/documentation for each of them).
You might want to take a look at NetBeans which has a Swing GUI Builder. You would have to redraw your components there, and then write all the code to process the events. It is sometimes good to start with that, though often times it is less frustrating to lay them out with code by hand as it can difficult to make changes in code and have the builder keep up. There is nothing I know that will let you start from a photoshop image and proceed to building a GUI. Sounds like a good project to make someone rich. :-)