[JAVA2D] line2D length problem
Hi All, Hoping someone can help me with this one ...? I need to draw lines with a width greater than 1 and the lengths may be a real value so I am using Line2D.Float. I need to draw exact (calculated)lengths so I am using CAP_BUTT so the line does not have any additional apparent length (the other CAP options have the effect of adding the line width to the line) The problem I am having is that once the line width is set to greater than 1, the lines are actually drawn 1 pixel short. I am sure I am missing soething simple here but have spent a lot of time on it! I know that I can work around it but do I need to, I shouldn't have to + 1 to my line lengths depending on there width? The following demonstrates the problem. I am drawing on a JPanel within a JFrame, JDK/JRE 6, Windows g2.setStroke(new BasicStroke(1,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)); g2.setColor(Color.BLACK); g2.draw(new Line2D.Float(20,40,20,75)); // vertical line as marker only // draw 2 lines with line width of 1 g2.setColor(Color.RED); g2.draw(new Line2D.Float(20,60,21,60)); // draws 2 pixel line as expected g2.draw(new Line2D.Float(22,60,23,60)); // draws 2 pixel line as expected ... total of 4 pixels // draw 2 lines with line width of 10 g2.setStroke(new BasicStroke(10,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)); g2.setColor(Color.GREEN); g2.draw(new Line2D.Float(20,70,21,70)); // draws 1 pixel only at 20,70 g2.setColor(Color.YELLOW); g2.draw(new Line2D.Float(22,70,23,70)); // draws 1 pixel only at 22,70... so, each line is shortened by 1 pixel // this applies to any line width > 1 Thanks Lew [Message sent by forum member 'aussielew' (aussielew)] http://forums.java.net/jive/thread.jspa?messageID=291753 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
Re: [JAVA2D] VolatileImage.validate() does not (always) work
Okay, when I decide to use "active rendering" in windowed mode, do I get hardware acceleration as well? I just surfed a little bit through the net regarding this topic and read here http://www.gamedev.net/reference/programming/features/javarender/page2.asp , that this attempt uses blitting in windowed mode. That is exactly what I wanted to avoid because in the beginning of my coding, I used BufferedImages and got 100% CPU usage because the transfering of the image from main memory to the graphics card (-> the blitting) was so cost expensive. Maybe i didn't get this issue right here, because after all that what I already tried and all the different possibilities, I am very confused . .. . If I would be in fullscreen mode and could use page flipping, that would be an alternative if not my accelerated memory on my graphics card would be so limited (-> 64MB). Page flipping would mean, that I have to allocate twice the size of my image in memory, right? You have to remember, that there are some more backbuffers for our old images that have to be stored in that memory, too. After exprimentationing and testing the whole day, today, I got to the point that my biggest problem is exactly this limited VRAM memory . . . . . Especially because it is very frustrating, that the memory is lockked a long time after an image had been disposed (I hoped that VolatileImage.flush() would have helped that problem, but it does not really . . .). [Message sent by forum member 'kiamur' (kiamur)] http://forums.java.net/jive/thread.jspa?messageID=291707 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
Re: [JAVA2D] VolatileImage.validate() does not (always) work
That's the way I do things. I do active rendering using BufferStrategy. I turn off repaint() setIgnoreRepaint(true) while I'm active rendering and then when I'm not active rendering and the applet is just sitting there, I turn on repaint() with setIgnoreRepaint(false) so that if the applet gets covered and then re-exposed, it repaints on the screen properly. My paint() method looks a lot like my active rendering method with slight differences in the implementation. I think that way of drawing on the screen is great especially if you need a high frame rate. Depending on the size of the screen area rendered to, I can get a frame in less than 100 milliseconds on my old, slow computer. The tricky part is trying to get the "look and feel" of the applet to be constant on computers with much faster graphics and processors. I try to adjust the amount of drawing by calculating the average number of frames per second and then adjusting the "movement" of the image. Lot's of fussy details... Dmitri Trembovetski wrote: You can certainly use repaint() with VolatileImages as back buffers. The alternative approach is called "active rendering", where you control when stuff gets rendered. Take a look at this: http://java.sun.com/docs/books/tutorial/extra/fullscreen/rendering.html While this is a "full screen" tutorial, the same applies for rendering in windowed mode. Also, I reiterate, it is better to use active rendering and BufferStrategy for double buffering, especially if your application is 'game-like'. Thanks, Dmitri [EMAIL PROTECTED] wrote: Hi Ken, With VolitileImages, you should render directly from your program by calling your own render method directly. Don't call repaint(). I do use my own render method, but that method only renders on my background volatile image. After that is finished I somehow have to get my image onto the screen (or to be more precise on my panel). Then, I assume, I have to call repaint() (of the panel) out of my own render method, don't I? Maik [Message sent by forum member 'kiamur' (kiamur)] http://forums.java.net/jive/thread.jspa?messageID=291577 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
Re: [JAVA2D] VolatileImage.validate() does not (always) work
You can certainly use repaint() with VolatileImages as back buffers. The alternative approach is called "active rendering", where you control when stuff gets rendered. Take a look at this: http://java.sun.com/docs/books/tutorial/extra/fullscreen/rendering.html While this is a "full screen" tutorial, the same applies for rendering in windowed mode. Also, I reiterate, it is better to use active rendering and BufferStrategy for double buffering, especially if your application is 'game-like'. Thanks, Dmitri [EMAIL PROTECTED] wrote: Hi Ken, With VolitileImages, you should render directly from your program by calling your own render method directly. Don't call repaint(). I do use my own render method, but that method only renders on my background volatile image. After that is finished I somehow have to get my image onto the screen (or to be more precise on my panel). Then, I assume, I have to call repaint() (of the panel) out of my own render method, don't I? Maik [Message sent by forum member 'kiamur' (kiamur)] http://forums.java.net/jive/thread.jspa?messageID=291577 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
Re: [JAVA2D] VolatileImage.validate() does not (always) work
Hi Ken, >With VolitileImages, you should render directly from >your program by calling your own render method directly. >Don't call repaint(). I do use my own render method, but that method only renders on my background volatile image. After that is finished I somehow have to get my image onto the screen (or to be more precise on my panel). Then, I assume, I have to call repaint() (of the panel) out of my own render method, don't I? Maik [Message sent by forum member 'kiamur' (kiamur)] http://forums.java.net/jive/thread.jspa?messageID=291577 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
Re: [JAVA2D] VolatileImage.validate() does not (always) work
If you call repaint() you invoke the AWT thread and paint() is called by the AWT thread. update() and paint() should not be called directly by your program they are generally called from the AWT thread in response to some sort of system event like Expose or Move etc. With VolitileImages, you should render directly from your program by calling your own render method directly. Don't call repaint(). Dmitri, did I get that right? [EMAIL PROTECTED] wrote: Hi Ken, I'm just at work and see that I call it indirectly through repaint(). To be honest, it confuses me a bit that there are the methods repaint(), paint(Grphics g) and even update(Graphics g). I'm sure that I read about the differences and when I have to use one or the other at the time I was first creating my panel, but now, I just don't know anymore the differences and meanings of them . . . . Maik [Message sent by forum member 'kiamur' (kiamur)] http://forums.java.net/jive/thread.jspa?messageID=291504 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
Re: [JAVA2D] VolatileImage.validate() does not (always) work
Hi Ken, I'm just at work and see that I call it indirectly through repaint(). To be honest, it confuses me a bit that there are the methods repaint(), paint(Grphics g) and even update(Graphics g). I'm sure that I read about the differences and when I have to use one or the other at the time I was first creating my panel, but now, I just don't know anymore the differences and meanings of them . . . . Maik [Message sent by forum member 'kiamur' (kiamur)] http://forums.java.net/jive/thread.jspa?messageID=291504 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
