🚀 go-pugleaf

Hi Avi!

Thanks alot for your reply. Well, you�re right, maybe I should start up with
an easier project :-) I have experience in C++ as well as in some other
languages so Java should not be completly new to me. I played around by
myself and I could figure out some things that helped me progressing to my
goal. But there are still some unanswered questions :-) I�ll have a look at
the clock sample and the website you gave me ... so I hope I�ll find some
useful hints.

Regards

Markus


"Avi Abrami" <aabrami@intersystemsww.com> wrote in message
news:3BFB981E.6722C34D@intersystemsww.com...
> Markus Stehle wrote:
>
> > Hi all!
> >
> > I�m new to Java development. I�m trying to write a little applet with a
bar
> > chart where the user can control each bar (currenlty 3 bars, the user
can
> > use his mouse to rise or lower each bar seperatly; rising or lowering
one
> > bar influences the other ones). Each bar is painted in a separate
Canvas. To
> > display the bars I use the fillRect() and clearRect() method of the
Graphics
> > object which is obtained from the different Canvases. My first problem
is
> > about applet initialzitaion: when the applet starts, three unfilled
> > rectangles should be painted so that user can see something in his
browser -
> > not only a gray apllet box. When I call the myCanvas.getGraphics() and
> > myGraphics.fillRect() method in my jbinit() method, I always get null
> > pointer exceptions. I assume the objects are not already created while
the
> > constructor method is executed so I ca�n't access them. So where else
can I
> > call my methods? Is there something like an "applet loaded" event which
I
> > can catch and make my drawings there?
> >
> > My second question is about background images. How can I lay an image
behind
> > my bars? When I call the drawImage() method of the Graphics object and
> > afterwards the drawRect() method, the image is positioned before the
> > rectangle instead of behind.
> >
> > Thanks & Regards
> >
> > Markus
>
> Hi Markus,
> First, I would like to make two observations:
>
> 1. If you are new to java, you seem to be starting off
>    with an awfully complex project!
> 2. From personal experience, java newcomers should
>    really stay away from the JBuilder wizards until they
>    have mastered the basics using first principals -- in
>   other words, best to do everything yourself, without
>    the help of the wizard.
>
> Now to your question. Unfortunately, I can't really
> give you an answer, but I see this is the second time
> you're asking the same question (and you think
> you'll get better luck if you try a different newsgroup)
> so I thought I'd suggest something (a bit simpler than
> what you're trying) with the hope that it will help
> progress you toward your goal.
>
> Anyway, the JDK comes with a sample applet
> that displays an analog clock whose hands move
> in real time (including a seconds hand, I think).
> The source code is also available in the JDK,
> so perhaps it can help you understand the use
> of the Graphics class.
>
> Also, are you familiar with JARS
> (http://www.jars.com)? They may have applets
> similar to what you are trying to do, which may
> help you, also.
>
> Good Luck,
> Avi.
>
>
>