On 26.07.2011 19:31, W Wlourf wrote: > Hi, > > > Thanks for your answer. > > I think I have a wrong version of awesome (awesome debian/3.4.6-1 (Hooch)) > because I didn't manage to install oopango and the textbox.lua is not the > same as in your message.
Uhm, 3.4.6 doesn't use oocairo, only the git/master branch does so. > Anyway, I will use the function cr:show_text(), thank for the tip. It's for > writing vertical text from bottom to top. It's quite easy with : > cr:translate(w/2,h/2) > cr:rotate(-math.pi/2) How does this work with awesome 3.4.6? Oo > Browing the oocairo lib, I found theses functions : > scaled_font_create, font_options_create, toy_font_face_create > Do you know where I can find > documentation on theses functions. I think I can change the font with > them but didn't find how to do ! > Forget that, I just found "man lua-oocairo" if someone has the same question > ! I will read that now! Most functions are straight-forward wrappers of the cairo C api. http://cairographics.org/manual/ > I don't know if the text API is > buggy but I had fun with it when I used it with Conky > (http://wlourf.deviantart.com/gallery/28062900#/d36njc0 it's an > example, not a conky). > I've just had problems with "cairo_text_extents" method which is difficult > too understand (for me). In the C API, this just returns the extents of said text. Sounds easy to me. oocairo wraps this as 'local result = cr:text_extents("foo")'. result will be a table with the relevant fields ("x_bearing", "y_bearing", "width", "height", "x_advance", "y_advance"). Cheers, Uli > ----- Mail original ----- >> De : Uli Schlachter <psyc...@znc.in> >> À : awesome@naquadah.org >> Cc : >> Envoyé le : Samedi 23 Juillet 2011 9h20 >> Objet : Re: text with oocairo >> >> On 23.07.2011 00:24, W Wlourf wrote: >>> I'm looking for an example for drawing a text with oocairo. Is it >> possible ? >> >> Let's look at what awesome is doing (wibox/widget/textbox.lua): >> >> The "magic" starts in the function draw(). I'll inline all the >> various functions >> here, in the code there is more than one function, because similar code is >> needed for getting the text extents: >> >> local l = oopango.cairo.layout_create(cr) -- We are drawing to this context >> l:set_alignment("left") -- Align left (not right or center) >> l:set_ellipsize("end") -- Shorten the text at the end if too long >> l:set_wrap("word_char") -- Try wrapping at words, but use chars if >> necessary >> l;set_width(width) -- Available width for the text >> l:set_height(height) -- Available height >> l:set_font_description(beautiful.get_font("font name here, leave empty for >> default") >> if markup then >> l:set_markup(text) >> else >> l:set_text(text) >> end >> >> [Here comes some magic to align text vertically, can be found at the end of >> setup_layout() if you really care] >> >> oopango.cairo.update_layout(cr, layout) >> oopango.cairo.show_layout(cr, layout) >> >> And the text is drawn. :-) >> >> All the various set_foo() calls can be skipped to use the defaults. So if you >> just want to say "Hi": >> >> local l = oopango.cairo.layout_create(cr) >> l:set_text("Hi") >> oopango.cairo.update_layout(cr, layout) >> oopango.cairo.show_layout(cr, layout) >> >> >> The difference between set_markup and set_text is that set_text doesn't >> interpret pango markup. This means that <b>Hi</b> would be drawn >> as-is by >> set_text() while set_markup() would show "Hi" in bold. >> >> For the other set_foo() calls, check out the pango documentation: >> >> http://developer.gnome.org/pango/stable/pango-Layout-Objects.html >> >> This is what beautiful.get_font() basically does: >> >> return oopango.font_description_from_string(name) >> >> This is pango_font_description_from_string() in the C API: >> >> http://developer.gnome.org/pango/stable/pango-Fonts.html#pango-font-description-from-string >> >> >> I hope this helps you with drawing text with oopango. May I ask what you are >> trying to do? >> >> Uli >> >> P.S.: There was an API change in oopango. Your version might use >> oopango.cairo_update_layout and oopango.cairo_show_layout instead of the >> above >> version with an extra dot. >> >> P.P.S.: You asked about drawing text with oocairo. The cairo devs say their >> text >> API is only a toy and shouldn't be used, because it got lots of >> shortcomings. If >> you *really* want to draw text with oocairo, use: >> cr:show_text("Hi") >> >> P.P.P.S: All the text drawing uses the current point for the text position. >> So >> use cr:move_to(x, y) for positioning the text. >> >> -- >> - Buck, when, exactly, did you lose your mind? >> - Three months ago. I woke up one morning married to a pineapple. >> An ugly pineapple... But I loved her. >> >> -- >> To unsubscribe, send mail to awesome-unsubscr...@naquadah.org. >> > -- - Buck, when, exactly, did you lose your mind? - Three months ago. I woke up one morning married to a pineapple. An ugly pineapple... But I loved her. -- To unsubscribe, send mail to awesome-unsubscr...@naquadah.org.
