Re: Re: Graphics Question
- To: mathgroup at smc.vnet.net
- Subject: [mg35469] Re: [mg35459] Re: Graphics Question
- From: jmt <jmt at agat.net>
- Date: Sun, 14 Jul 2002 06:19:42 -0400 (EDT)
- References: <firstname.lastname@example.org> <email@example.com> <200207130748.DAA08580@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
I would like to add :
Some interactivity can be achieved using java graphics capabilities,
consequently should be OS independant.
On Saturday 13 July 2002 09:48, AES wrote:
> > > Is there any way to create interactive graphics? It seems all
> > > animation is done by precalculating frames. For some things this is
> > > ok, but it would be nice to be able to dynamically alter a graphic, and
> > > even better make changes based on input of various sorts. Perhaps an
> > > add-on package exists? Or perhaps in an upcoming version?
> I believe this is a fair and significant question to pose -- and
> unfortunately a difficult one for Mathematica to answer.
> What this poster would like, and so would I, is the ability to add a new
> point or object, or a succession of new objects, to an existing
> on-screen plot, without redrawing the whole plot -- for example, to see
> a curve "crawl" across a plot without calculating and storing a whole
> bunch of nearly identical images, or to let a user interactively move an
> object in a plot with the mouse and see other parts of the plot change
> appropriately in a fluid and instantaneous fashion. We'd like this to
> be fast, and also very simple to program (an Mathematica command
> "ShowAdded[Graphics[--]]" that adds a new graphics element to a plot
> that's already on screen, along with an "Erase[Graphics]" command.)
> Unfortunately, as I understand it, Mathematica graphics just aren't set
> up to function in this fashion. These capabilities can be simulated to
> some extent, if the computer is fast enough, but I believe the
> fundamental architecture of Mathematica is based on formulating, then
> displaying one complete PostScript graphic at a time. The idea of
> adding new points to an existing, already on screen plot, without
> redrawing the whole image, is not part of the underlying structure.
> I don't fault Mathematica for this; It may not be possible to do
> otherwise in a multi-platform package. Adding to a display already on
> screen I believe implies having access to system-level or "screen-level"
> aspects of the computer, and these are greatly different from computer
> to computer.
> Comments from more knowledgeable people obviously welcomed . . .
> [Incidentally, is there an "Erase" command in Mathematica now? Can I
> myGraphic =Graphics[bunch-of-graphics-stuff]
> Erase[myGraphic, one-piece-of-this-stuff]
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