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Java Forum / General / July 2007Saving canvas
Hi. I have a problem with saving canvas to file. All over net there are faqs on how to save a NEW canvas to file (after drawing on it). I have a canvas, what should i do in order to save what's currently on it to a file? > Hi. I have a problem with saving canvas to file. All over net there > are faqs on how to save a NEW canvas to file (after drawing on it). I > have a canvas, what should i do in order to save what's currently on > it to a file? Do you want to save a canvas or some sort of image to the file? Canvas is Serializable so you can write it to a file using ObjectOutputStream. That may or may not allow you to recreate what was drawn on the Canvas. If what you want is an image saved to a file, you should draw on a BufferedImage and save that to the file using ImageIO. You can display the BufferedImage on your Canvas.  SignatureKnute Johnson email s/nospam/knute/ On 29 Lip, 19:24, Knute Johnson <nos...@rabbitbrush.frazmtn.com> wrote: > > Hi. I have a problem with saving canvas to file. All over net there > > are faqs on how to save a NEW canvas to file (after drawing on it). I [quoted text clipped - 12 lines] > Knute Johnson > email s/nospam/knute/ I've noticed a lot of examples in the web on how to save bufferedimage to file, which, in answer to Your question, is my goal. I just wanted to find out if there is any way of saving the image directly from canvas. Thank You for Your answer. >I've noticed a lot of examples in the web on how to save bufferedimage >to file, which, in answer to Your question, is my goal. I just wanted >to find out if there is any way of saving the image directly from >canvas. Thank You for Your answer. You could screen scrape to capture the bits on the screen. See http://mindprod.com/jgloss/screenscraping.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > On 29 Lip, 19:24, Knute Johnson <nos...@rabbitbrush.frazmtn.com> > wrote: [quoted text clipped - 18 lines] > to find out if there is any way of saving the image directly from > canvas. Thank You for Your answer. If the only drawing on your Canvas is done in the paint() method you could use that method to draw onto the BufferedImage. The technique would be to get a draw Graphics for the BufferedImage and then call paint() with that Graphics. If your drawing is going to be from user interaction then using the BufferedImage as your drawing surface and displaying that to the user makes more sense. Of course in the first case above, serializing the Canvas would work too. SignatureKnute Johnson email s/nospam/knute/ >Of course in the first >case above, serializing the Canvas would work too. I suspect that a serialised Canvas could not be reconstituted in a different machine. I think it will be specific to the screen hardware. I know Image has this problem. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >> Of course in the first >> case above, serializing the Canvas would work too. > I suspect that a serialised Canvas could not be reconstituted in a > different machine. I think it will be specific to the screen hardware. > I know Image has this problem. In a serialized object all that gets stored are the fields. The data to recreate the drawing would have to be stored in fields in the Canvas. The actual drawing surface would be lost. I need to play with this some but I've got to go to work this week. If I have time I'll post something from the road :-). Interesting possibilities though. SignatureKnute Johnson email s/nospam/knute/ >Hi. I have a problem with saving canvas to file. All over net there >are faqs on how to save a NEW canvas to file (after drawing on it). I >have a canvas, what should i do in order to save what's currently on >it to a file? see http://mindprod.com/jgloss/jpegencoder.html http://mindprod.com/jgloss/pngencoder.html http://mindprod.com/jgloss/gifencoder.html Also just save the data you used to generate the image using a DataOutputStream of ObjectOutputStream. See http://mindprod.com/applet/fileio.html for sample code. For complete sample code that does this see http://mindprod.com/products.html#MASKER You will don't literally save the bits being viewed on a Canvas -- it's bits are in proprietary video-card format in the hardware REGEN buffer. You repaint the Canvas with a different sort of Graphics object that saves the bits in a more standard format to ordinary RAM. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com 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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