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Java Forum / GUI / June 2009Determining image bounds of image created in code
I have written code which creates an image on a JPanel (inside a JFrame) and saves it as a jpeg. Each image is a different size, so I need to manually resize the JFrame to the bounds of the image before saving (else the whole image isn't saved). I would like to be able to determine the bounds of the image in code, so this manual resizing is not needed. How would I go about acheiving this? Thanks in Advance. > I have written code which creates an image.. > I would like to be able to determine the bounds of the image ... Given you created the Image, I cannot understand how you cannot know its bounds. Can you prepare an SSCCE* that sums up your current code? * <http://pscode.org/sscce.html> -- Andrew T. pscode.org > I have written code which creates an image on a JPanel (inside a > JFrame) and saves it as a jpeg. [quoted text clipped - 5 lines] > How would I go about acheiving this? > Thanks in Advance. I am a bit confused. All images implement getWidth() and getHeight() methods. Is there a reason why you cannot use those?  SignatureRegards, Jarrick ------------------------------------ Jarrick.Chagma@your.mind.gmail.com (Lose your mind before emailing me) > > I have written code which creates an image on a JPanel (inside a > > JFrame) and saves it as a jpeg. [quoted text clipped - 8 lines] > I am a bit confused. All images implement getWidth() and getHeight() > methods. Is there a reason why you cannot use those? The image includes a lot of text. I override the paintComponent method, and use the drawX methods on the Graphics2D object. If I create an image by say creating a BufferedImage, the size is taken in the constructor. Basically in a nutshell I suppose I want to crop the image, or resize the JPanel to fit the image, with no excess... Is that any clearer? >>> I have written code which creates an image on a JPanel (inside a >>> JFrame) and saves it as a jpeg. [quoted text clipped - 15 lines] > the JPanel to fit the image, with no excess... > Is that any clearer? BufferedImage has a method to get a sub-image so assuming you know how big it is, that shouldn't be a problem. If you then want do draw that image onto a JPanel and you want the full JPanel displayed in your JFrame, you need to set the preferred size of the JPanel to the size of your image and call pack() on the JFrame. You also might just be able to call validate() but I'd have to try that. But it still isn't 100% clear that that is what you want. You might try again by explaining it from the beginning. SignatureKnute Johnson email s/nospam/knute2009/ > But it still isn't 100% clear that that is what you want. You might try > again by explaining it from the beginning. I think Andrew got it when he mentioned FontMetrics. The OP has a bunch of stuff to render, and wants to discover how much space in pixels it will take. The OP is hoping that some Java (Swing) class will do this for him. This is kinda similar to the JTextArea question we got earlier, where the poster was hoping the JTextArea could expand and report to it's parent the size of all the text it has. (JTextArea does the opposite: it takes a size from it's parent and fits it's contents into that, with scroll bars if needed.) So yeah, Java could use a "render all this crud for me and tell me how big it was" class. I don't know of one. > > But it still isn't 100% clear that that is what you want. You might try > > again by explaining it from the beginning. [quoted text clipped - 12 lines] > So yeah, Java could use a "render all this crud for me and tell me how > big it was" class. I don't know of one. As suggested, I typically use a Font's getStringBounds() or a Graphics context's getFontMetrics().stringWidth(s) to position a single line of text. I see that LineBreakMeasurer can calculate a series of TextLayouts for lines of styled text. The union of each TextLayout's getBounds() might reasonably approximate the area required, without actually rendering the text. <http://java.sun.com/javase/6/docs/api/java/awt/font/LineBreakMeasurer.html> <http://java.sun.com/javase/6/docs/api/java/awt/font/TextLayout.html> SignatureJohn B. Matthews trashgod at gmail dot com <http://sites.google.com/site/drjohnbmatthews> Please trim replies of text no longer immediately relevant. ... > > > I would like to be able to determine the bounds of the image in code, ... > The image includes a lot of text. See <http://java.sun.com/javase/6/docs/api/java/awt/FontMetrics.html> -- Andrew T. pscode.org Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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