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? <div class="gmail_quote">On Wed, Jul 28, 2010 at 12:27 AM, Behdad Esfahbod <<a href="mailto:behdad.esfahbod@gmail.com">behdad.esfahbod@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div class="im">On 07/28/10 03:20, Kayven Riese wrote: > Is that why I am getting a seg fault? </div>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 <div class="im"> > /********************************** > 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 <<a href="mailto:donn.ingle@gmail.com">donn.ingle@gmail.com</a> </div><div class="im">> <mailto:<a href="mailto:donn.ingle@gmail.com">donn.ingle@gmail.com</a>>> 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 </div>> <a href="mailto:cairo@cairographics.org">cairo@cairographics.org</a> <mailto:<a href="mailto:cairo@cairographics.org">cairo@cairographics.org</a>> <div><div></div><div class="h5">> <a href="http://lists.cairographics.org/mailman/listinfo/cairo" target="_blank">http://lists.cairographics.org/mailman/listinfo/cairo</a> > > > > > -- > > *----------------------------------------------------------* > Kayven Riese, BSCS, > MS (Physiology and Biophysics) > (415) 902 5513 cellular > <a href="http://kayve.net" target="_blank">http://kayve.net</a> > Webmaster <a href="http://ChessYoga.org" target="_blank">http://ChessYoga.org</a> > *----------------------------------------------------------* > > > > > > -- > cairo mailing list > <a href="mailto:cairo@cairographics.org">cairo@cairographics.org</a> > <a href="http://lists.cairographics.org/mailman/listinfo/cairo" target="_blank">http://lists.cairographics.org/mailman/listinfo/cairo</a> </div></div></blockquote></div> -- *----------------------------------------------------------* Kayven Riese, BSCS, MS (Physiology and Biophysics) (415) 902 5513 cellular <a href="http://kayve.net">http://kayve.net</a> Webmaster <a href="http://ChessYoga.org">http://ChessYoga.org</a> *----------------------------------------------------------*