Re: Text extent implemented (partially)

[Ben Abbott]

On Mar 7, 2010, at 4:05 PM, Michael Goffioul wrote:

> FYI,
> 
> I've pushed the following changeset:
> 
> http://hg.savannah.gnu.org/hgweb/octave/rev/9f2bf537a651
> 
> This implements text extent property, at least the width and
> height parts. The left and bottom are always set to the lower
> left corner of the axes box. It also takes into account the
> rotation of the text, but only multiples of 90 (these are the
> only rotations supported by the renderer anyway).
> 
> It also implements correct updaters for the position and
> extent properties (for text objects), so you can basically
> get the text size in pixels.
> 
> I think this should be ok to start looking at the legend stuff.
> 
> Note that I won't have the time in the coming days to continue
> the implementation, so if anyone want to take over, be my guest.
> 
> Michael.

I played with this today. Looks good to me (works for fltk and gnuplot). 
However, I have some questions.

When you wrote ...

> The left and bottom are always set to the lower
> left corner of the axes box

I assume you meant;  "The left and bottom are always set to the lower left 
corner of the text's bounding box."?

Regarding text rotation, I had thought OpenGL was able to arbitrarily rotate 
outline fonts, but only able to handle increments of 90 degrees for bitmaps. Am 
I confused?

Ben