[cairo] Want to stretch my fonts

[Kayven Riese]

OK.. but now I am confused about how this is supposed to work.

         cairo_get_font_matrix(cr,&fatrix);
 86         //cairo_matrix_init_scale(&fatrix,0.8,1);
 87         cairo_set_font_matrix(cr,&fatrix);

The attached pngs are cellgram.png with line 86 commented out.. and the
other file with the cairo_matrix_init_scale active.. I am seeing a
translation instead of a vertical shear .. or.. umm.. I wanted to squish the
word so it would fit in the cell.  I just wanted to do some numerical
experiments (hence just plugged in 0.8 and 1).. what am I missing?


On Wed, Jul 28, 2010 at 12:27 AM, Behdad Esfahbod <behdad.esfahbod at gmail.com
> wrote:

> On 07/28/10 03:20, Kayven Riese wrote:
> > Is that why I am getting a seg fault?
>
> No.  The reason is that you defined fatrix as a pointer.  A pointer
> pointing
> nowhere.  Instead you should define it as a cairo_matrix_t, then in your
> code,
> replace all "fatrix" occurrences with "&fatrix", and also use
> cairo_matrix_scale(&fatrix,0.8,1) instead of that cairo_matrix_init_scale()
> line of yours.
>
> behdad
>
> >      /**********************************
> >  80          * Nuclear Proteins
> >  81          **********************************/
> >  82         cairo_set_font_size (cr, (1400.0*nuclear)/total);
> >  83         cairo_set_source_rgb (cr, 0.4, 0.2, 0.6);
> >  84         cairo_move_to (cr, BORDER+CELL_DIAM/2-3600*nuclear/total,
> > TOP_BORDER+1000*nuclear    /total);
> >  85         cairo_get_font_matrix(cr,fatrix);
> >  86         cairo_matrix_init_scale(fatrix,0.8,0);
> >  87         cairo_set_font_matrix(cr,fatrix);
> >  88         cairo_show_text (cr, "N");
> >  89         cairo_set_font_size (cr, (1040.0*nuclear)/total);
> >  90         cairo_show_text (cr, "ucLea");/**/
> >  91         cairo_set_font_size (cr, (1400.0*nuclear)/total);
> >  92         cairo_show_text (cr, "R");/**/
> >  93
> >
> > Do the scale factors multiply or add?  I am supply sy = 0.. maybe I want
> > sy = 1
> >
> >
> > On Wed, Jul 28, 2010 at 12:16 AM, donn <donn.ingle at gmail.com
> > <mailto:donn.ingle at gmail.com>> wrote:
> >
> >     On 28/07/2010 08:56, Kayven Riese wrote:
> >
> >         I need to learn to make my letters on a different
> >         canvas and combine the two canvases or something, don't I?
> >
> >     Have a look at context.save() and context.restore() -- you can have
> >     a different matrix within those two and not affect the one outside.
> >
> >
> >     \d
> >
> >
> >     --
> >     cairo mailing list
> >     cairo at cairographics.org <mailto:cairo at cairographics.org>
> >     http://lists.cairographics.org/mailman/listinfo/cairo
> >
> >
> >
> >
> > --
> >
> > *----------------------------------------------------------*
> >   Kayven Riese, BSCS,
> >                       MS  (Physiology and Biophysics)
> >   (415) 902 5513 cellular
> >   http://kayve.net
> >   Webmaster http://ChessYoga.org
> > *----------------------------------------------------------*
> >
> >
> >
> >
> >
> > --
> > cairo mailing list
> > cairo at cairographics.org
> > http://lists.cairographics.org/mailman/listinfo/cairo
>



-- 

*----------------------------------------------------------*
  Kayven Riese, BSCS,
                      MS  (Physiology and Biophysics)
  (415) 902 5513 cellular
  http://kayve.net
  Webmaster http://ChessYoga.org
*----------------------------------------------------------*
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