On Mon, Mar 22, 2021 at 10:03:09PM +0100, Ralf Hemmecke wrote:
> > Our graphics routines can create Postscript.
>
> I actually thought so, but never looked deeper to find out how this can
> be done.
Click PS button in graphics menu. Draw has options giving output
format. To avoid explicit options in drawing commands we would
have to include Postscript in default output format. Crude
way is to modify .spad file defining default. I am not sure
if there is nicer way. When generationg .pht files HyperDoc
sends some inital setup commands, it would be natural to
change output format there.
> > ATM you need access to X server for this, but you also need access
> > to X server to create .xpm, so this really is not extra requirement.
>
> Hmmm... in fact, I don't know what .xpm is really used for other than
> being converted into .ps. Maybe HyperDoc pics it up, but I never looked
> at what HyperDoc wants.
Well, 'draw' sends data to C side. This is used for display.
When you store image C program save requested data formats
(which in case of viewport includes .data which is essentially
copy of data sent from FRICASsys to C side). However, when
you clik on image in HyperDoc, then viewer uses .xpm (presumably
the idea was to save time needed to render data).
BTW1: 2D Postscript output ATM is black and white. So
you may prefer .xpm due to color. OTOH, .xpm is just pixel
data, so Web-friendly convertion would go to .png
BTW2: Long ago I was thinking about replacing use of .xpm
by .png. However, to my surprize compressed .xpm was
smaller than corresponding .png. So with .png our
compressed tarball would be slightly bigger. So it looked
that .png gave us no advantage and I did not look how
much effort would be needed to generate .png
BTW3: 'scene' framework can generate other formats, but it
is not clear how to connect it to 'draw' so that the
whole thing operate as a whole (ATM you need completely
different commands to get output from 'scene' framework).
--
Waldek Hebisch
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