I have an image saved as byte array, which is already rendered and will fit perfectly into my GUI application (no filtering, rotation, resizing or color transformation is needed). What is the fastest way to show the image?
I'm not sure what Swing is doing internally with the image before it actually shows it. But I try to bypass all these steps and directly show it without any additional Swing processing. Can you think of a way to do this?
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I'm showing an Image on a Canvas using JavaFX, but I would like the color of certain parts of the image to vary based on a variable. Ordinarily, I imagine this would be accomplished by creating a color mask and adding that to the image, but as far as I can find JavaFX Image doesn't allow any operations like that, and from the documentation it looks like JavaFX Images can only be loaded from a file. I don't want to modify and then reload the file each time the color changes, because that seems pretty inefficient performance-wise.
My goal is to create an interactive offline app in which a small character is shown, and the user can (for example) use an input to change the characters eye/hair color.
Are there any ways to accomplish this? Essentially doing basic image masking/coloration with JavaFX Images and canvases. (Not ImageView)
Thanks for any advice you can give me!
I'm actually trying to create many images (chat bubbles) with text inside them and obviously on using 9-patch it gets distorted. Is there an alternative way to save the text from distortion and simultaneously enlarging it along with the image(chat bubble)?
The whole idea of 9-patches is to separate text from background. You setup the form of your background bubble and mark the stretchable area and padding. In LibGDX all you have to do is create a Labelstyle that takes that 9-patch bubble as a background and put text in it. The bubble will stretch as your text increases. This however works best for squarish backgrounds but can work for your bubbles with a little tweaking and if you don't stretch them too crazy.
I am a C/C++ programmer trying my hand at Java for the first time. I'm currently working on a program that reads in a bunch of data and builds a map. I want to give the user the option to toggle various features of the map using check boxes.
In the Win32 API, I was able to accomplish this by pre-building the features on transparent bitmaps and then BitBlt()ing them over top one another. Does Java Swing support something similar? I imagine I'm not the only person who has ever wanted to do this. Building the features is relatively slow, so I only want to generate the layers once and then block copy them to the JPanel I'm using as a display.
Thanks in advance!
You could dynamically create BufferedImage objects, with alpha channels, then only paint this on a frame if the checkbox is checked.
You can store images in Swing using the BufferedImage class, and then use that to later draw the final image.
http://docs.oracle.com/javase/6/docs/api/java/awt/image/BufferedImage.html
The final image can later be painted on to the JPanel (probably by overriding the JPanel's paintComponent method) by using the alpha values of the images.
I need Your help in generating offscreen images from graphics class and converting them to binary data without setting them visible on screen.
I want to generate large amounts of labels and send them to a printer as binary data. If i create the image, show it on screen and then send it, everything is ok, but i generate 100 labels in one minute and it is annoying when they flicker on the screen of my java aplication.
I want it to be generated by a seperate thread, without visible efects.
If i don't show them, the labels are send black. I tried to generate them, and then show them off screen, that did not match my expectations.
Is there a way to generate "invisible" images from Graphics2d??
or
Is there another way You could suggest me?
Thank You in advance
Qba
You can use a BufferedImage and use getGraphics() to get hold of a Graphics2D object that paints onto this image.
If you're after painting GUI components (if your "label" refers to JLabel for instance) you could have a look at these questions:
How to get a BufferedImage from a Component in java?
Java/Swing offscreen rendering (Cobra HTMLPanel -> BufferedImage) Problem: Component doesn't finish redrawing first
I'm in the process of writing a custom heatmap generator. I'm wondering what the fastest way is to draw boxes (up to around 1 million) in Java. Most questions I've found have concentrated on dynamic images (like in games), and I'm wondering if there's a better way to go for static images. I've tried using swing (via a GridLayout and adding a colored canvas to each box), drawing directly on the panel with Graphics2D, and also by using the Processing libraries. While Processing is pretty fast and generates a clean image, the window seems to have problems keeping it; it generates different parts of the image whenever you minimize, move the windows, etc.
I've heard of OpenGL, but I've never touched it, and I wanted some feedback as to whether that (or something else) would be a better approach before investing time in it.
For static images, I paint them to a BufferedImage (BI) and then draw that via Graphics2D.
I keep a boolean that tells me whether the BI is up to date. That way I only incur the expensive painting cost once. If you want to get fancy, you can scale the BI to handle minor resizing. For a major resizing you'll probably want to repaint the BI so as not to introduce artifacts. It's also useful for overlaying data (such as cross hairs, the value under the cursor, etc) as you're only painting the BI and the data.