[gameprogrammer] Re: A newbie Java Question - GUI/Animation etc...

From looking at what different people are doing, 
my biggest question is:

If you are using your own paint routines, and 
using the 'Graphics g' to do all of your drawing 
(which would be the fastest), when you start to 
develop 3d games and use BSP trees and files, with 
the accompanying collision checking routines, etc., 
would not this approach increase the complexity 
(and concomitant propensity for bugs) in 
development ?

With simple games it would not be an issue, but for 
games with any complexity, with behaviors that need 
to be triggered when the player POV enters or exits 
a given region, the techniques involved could get 
very difficult;  I'm a big fan of using layers 
to avoid the difficulties inherent in arbitrary 
geometries and behaviors. 

If a developer can use something like Xith3d 
(xith3d.org) to avoid re-inventing the wheel, 
I'm for it.

Tom C

--- richard sabbarton <richard.sabbarton@xxxxxxxxx>
wrote:

> Hi Steve,
> 
> Thanks for sending that through.  It looks exactly
> what I am looking
> for and I will certainly make use of it.
> 
> Regards
> 
> Richard
> 
> On 06/02/2008, Stephen & Kelly
> <gp@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> > Richard,
> >
> > All you need to do in Java to get double-buffering
> is something like:-
> >
> >
> > public class MyClass extends JFrame { // You can
> extend any Component IIRC
> >
> >  private BufferStrategy BS;
> >
> >    public MyClass() {
> >               this.createBufferStrategy(2); //
> Number of buffers
> >              BS = this.getBufferStrategy();
> >
> >    }
> >
> >    private mainGameLoop() {
> >       while (true) {
> >          Graphics g = BS.getDrawGraphics();
> >          // Do all drawing using g
> >          BS.show();
> >       }
> >    }
> >
> > }
> >
> > That's all there is to it, and you don't need to
> download any API's or
> > anything.  Good luck with the Java; I think it's
> great for games.
> >
> > Steve
> >
> >
> >
> > richard sabbarton wrote:
> > > Hi Tom,
> > >
> > > I downloaded the Java3D API from Sun.  It looks
> good but I think it
> > > was a bit much for what I was looking for. 
> Anyway, after a little
> > > further digging I managed to work out how to do
> what I was trying to
> > > do.
> > >
> > > The key to getting rid of the flicker was not
> using the paint()
> > > function but instead, using my own.
> > >
> > > Firstly, I created a new Image and then obtained
> the Graphics
> > > interface for the image.  This gave me my
> offscreen location to
> > > assemble my GUI.  I then use this image and draw
> it to the Graphics
> > > interface of my Applet
> > >
> > > // Variables and members
> > > Image offScreenImage;
> > > Graphics offScreenGraphics;
> > > Graphics onScreenGraphics;
> > >
> > > In the init function I run the following:
> > >
> > >     offScreenImage = createImage( width, height
> );
> > >     offScreenGraphics =
> offScreenImage.getGraphics();
> > >     onScreenGraphics = this.getGraphics();
> > >
> > >
> > > I then setup a timer to keep the screen
> up-to-date every xxx
> > > milliseconds which basically runs the following:
> > >
> > >     // Draw everything I need to my offscreen
> Graphics Interface
> > >     offScreenGraphics.drawImage( etc. etc. etc. 
> );
> > >     offScreenGraphics.drawImage( etc. etc. etc. 
> );
> > >     offScreenGraphics.drawImage( etc. etc. etc. 
> );
> > >
> > >     // Then draw the whole thing to screen with
> the Image Interface
> > >     onScreenGraphics.drawImage(offScreenImage,
> xxx , yyyy , this );
> > >
> > > Seems to work quite well for simple graphics and
> GUI etc.  If I want
> > > anything more complex then I will go down the
> Java3D route but for now
> > > this will do.
> > >
> > > Regards
> > >
> > > Richard
> > >
> > >
> > >
> > > On 04/02/2008, Tom Clifford
> <tjclifford@xxxxxxxxx> wrote:
> > >
> > >> Java has it's own Java3D interface, found at:
> > >>
> > >> http://java.sun.com/products/java-media/3D/
> > >>
> > >> It allows you to do what is called active
> rendering,
> > >> which is similar to the c/c++ WinMain/WndProc
> loops,
> > >> that uses double-buffering,
> > >> or you can create the objects you want and
> allow
> > >> Java3D to do the looping for you, while doing
> > >> animation with their Behavior objects.
> > >>
> > >> There are some good java examples with source
> > >> code, at Killer Game Programming with Java, by
> > >>  Andrew Davison
> > >>  O'Reilly, May 2005
> > >>  ISBN: 0-596-00730-2
> > >>  http://www.oreilly.com/catalog/killergame/
> > >>  Web Site for the book:
> > >>  http://fivedots.coe.psu.ac.th/~ad/jg
> > >>
> > >> code downloads and instructions at:
> > >>
> > >> http://fivedots.coe.psu.ac.th/~ad/jg/code/
> > >>
> > >> Tom C.
> > >>
> > >>
> > >> --- richard sabbarton
> <richard.sabbarton@xxxxxxxxx>
> > >> wrote:
> > >>
> > >>
> > >>> Hi Guys,
> > >>>
> > >>> In C++ on windows I would use animation by
> creating
> > >>> a compatible
> > >>> device context in memory with
> CreateCompatibleDC().
> > >>> I would write my
> > >>> game and all of its elements to the MemoryDC
> and
> > >>> then use something
> > >>> like BitBlt() to push it to my main DC.
> > >>>
> > >>> I have recently started learning Java and I
> want to
> > >>> perform a similar
> > >>> function.  I want to write all of the elements
> to
> > >>> memory and then
> > >>> transfer it to the screen every x
> milliseconds.
> > >>> This is to eliminate
> > >>> flicker etc.
> > >>>
> > >>> I have been looking online through tutorials
> etc.
> > >>> and I can't seem to
> > >>> find a description of how to do this.  Do I
> need to
> > >>> use java.awt or
> > >>> should I use javax.swing.
> > >>>
> > >>> Any thoughts on how to do this or suggestions
> on
> > >>> greating a game
> > >>> display in Java?
> > >>>
> > >>> Initially this is for display in an Applet in
> a web
> > >>> page.
> > >>>
> > >>> Regards
> > >>>
> > >>> Richard
> > >>>
> > >>> ---------------------
> > >>> To unsubscribe go to
> 
=== message truncated ===



      
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