Re: [Texmacs-dev] raw-data? How do I use this? Also - what is the best image format?

[Michael Lachmann]

I'm answering myself. Partly.

If I send:

DATA_BEGIN scheme:(image (tuple (raw-data (#
hexdump of file
) "png") "" "" "" "") DATA_END

I still get an error:
<error|bad image|<tuple|<error|compund #EEEEE>|png>>

However, if I save the file and reload it, then the image gets display 
correctly (!!).
I think this just means that I managed to confuse TeXmacs enough that the text 
representation of what I inserted is
correct, but the actual object isn't....

I still don't know what's the right way to do this ....

Thanks for listening!

Michael

On 28 Jul 2011, at 2:57PM, Michael Lachmann wrote:

> Ok, another question, related to the R interface.
> 
> I'm trying to fix image rendering in the interface. Eps works now, as does 
> pdf.
> 
> However, because pdf and eps is sometimes very big and renders amazingly slow 
> in TeXmacs, I'd like to give the user the option to render images in png.
> 
> The way I render eps/pdf now is this:
> 
> I send TeXmacs:
> 
> DATA_BEGIN scheme:(image (tuple (raw-data "
> 
> [at this point I cat the pdf/eps file into the pipe, and then send]
> 
> ") "eps") "" "" "" "") DATA_END
> 
> (or "pdf" for pdf). This is somewhat of a hack, but it works. Better than the 
> DATA_BEGIN ps: DATA_END
> interface. (because that interface seems to have broken some time ago...)
> 
> The problem is this:
> I'm a bit afraid to just cat the file to TeXmacs. I actually don't quite 
> understand why this works. The reason is that TeXmacs needs to identify when 
> the raw data ends. How does TeXmacs do this? I've no idea. I open a quote, 
> and close a quote after I printed the file. I think it works because by 
> default pdf/eps files don't have any quotes in them. Actually I tested this. 
> If, for example, the title of the plot has a quote in it all breaks... :)
> 
> So, I'd prefer to send the data to TeXmacs in hexadecimal. But I can't figure 
> out what the format is.
> I tried
> (raw-data #EEEEEEEE)
> (#EEEEEE)
> #EEEEEE
> EEEEE
> 
> (where EEEEE represents the hexdump of the file)
> 
> What is the right format?
> 
> 
> --------
> As an additional question - is there an optimal image format for TeXmacs. Is 
> there a format that doesn't need any conversion?
> 
> I think eps is converted to png to display it. As far as I can tell, png is 
> converted to eps and then that eps is converted to png to display it on 
> screen. Is there any way so that the image will not be converted (maybe until 
> I try to print the document)
> 
> 
> Thanks a lot!
> 
> Michael
> 
> 
> 
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