Are you trying to perpetually keep the path on the screen? So, basically,
your screen will look like a bunch of lines after a while?
-----Original Message-----
From: Jason Kretzer [mailto:jrkretzer@xxxxxxxxx]
Sent: Tuesday, March 15, 2005 9:44 AM
To: users@xxxxxxxxxx
Subject: Re: [cinjug-users] tracing a path
OK, I have this part. How would one go about getting
the points to stay put? After I draw a point and call
repaint on the JComponent toshow that point, the point
that I drew just before that disappears.
To work around that I am keeping a collection of all
points and redrawing all of them every time a new
point needs drawn. This does OK but is terribly
inefficient and little choppy.
Basically, every time I compute a new point, I need it
drawn without erasing any other previous point.
Does that make sense?
Thanks for your help everyone.
-Jason
--- Chris McMahan <cmcmahan@xxxxxxx> wrote:
> The secret is to think of it not as a line, but as a
> series of
> points. The applet you pointed out is merely drawing
> points on the
> canvas at the specified interval.
>
> Just extract the point's position at a certain point
> in your code as
> it moves around, and draw another point at those
> coordinates.
>
> - Chris
>
> Jason Kretzer writes:
> >Hello all:
> >
> >I am trying to draw a line behind a moving point so
> as
> >to draw the path of the point. I have looked
> through
> >the books that I have and I cannot seem to find
> >exactly what I need.
> >
> >Here is a website that has an applet that shows
> what I
> >am trying to do. Notice how the path is left
> behind
> >the moving ball image.
> >
>
>http://www.phys.hawaii.edu/~teb/java/ntnujava/bouncingBall/bouncingBall
>.html
> >
> >Any other resources would be appreciated.
> >
> >Thanks for the help.
> >
> >-Jason
> >
>
> --
> ================================
> Chris McMahan | cmcmahan@xxxxxxx
> ================================
>
>
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