about contibuting to octave

[Ben Abbott]

On Mar 3, 2009, at 2:52 PM, Michael Goffioul wrote:

> On Tue, Mar 3, 2009 at 6:51 PM, Shai Ayal <shaiay at gmail.com> wrote:
>> I think this is a good idea -- this will decouple the text object  
>> from
>> the backend.
>>
>> We will need to know what fonts gnuplot uses to get freetype to get  
>> us
>> gnuplot's font metrics?
>> I think we can get the standard postscript font metrics from similar
>> type1 fonts which freetype can use (I distributed a set of ps-similar
>> fonts with octplot)
>
> I guess gnuplot backend would use the back-up implementation.
> Or we could still use freetype, hoping that gnuplot will use the same
> metrics...
>
> Michael.

Gnuplot uses the GD library.

	http://en.wikipedia.org/wiki/GD_Graphics_Library

	http://www.libgd.org/Main_Page

After reading some hits via Google, it appears that this library can  
calculate the bounding rectangle text without rendering it, and that  
gdlib handles freetype, PS type 1 fonts, and truetype.

	http://my.php.net/gd

	imageftbbox — Give the bounding box of a text using fonts via freetype2

	imagepsbbox — Give the bounding box of a text rectangle using  
PostScript Type1 fonts

	imagettfbbox — Give the bounding box of a text using TrueType fonts

Ben