Re: Canvas basics

[Roger Leigh <rleigh whinlatter ukfsn org>]

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Jody Goldberg <jody gnome org> writes:

> On Thu, Dec 23, 2004 at 01:45:53PM +0000, Roger Leigh wrote:
> > One other problem I've run into is text scaling.  I can use
> > gnome_canvas_set_pixels_per_unit to set the canvas scaling factor
> > (cse-mainwindow.c, line 73).  If I change this, the text does not
> > scale with the other canvas items.  How can I get this to work
> > correctly?  At a scaling factor of 1.0, I get an unreadable mess.
>
> For custom canvas item's you are doing the drawing, and hence need
> to handle the scaling of text yourself.  Have a look at gnumeric's
> src/item-bar.c for an example.

Thanks, that was really helpful!

I was able to keep things fairly simple (a bit simpler than
item-bar.c).  Since I derived from GnomeCanvasGroup, I was able to
simply mess with PangoFontDescriptions, and then just use
gnome_canvas_item_set to do the changes, which avoids me messing with
PangoFonts directly (presumably at the expense of performance).


Regards,
Roger

- -- 
Roger Leigh
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