Re: "draw" icon with string

[<c buhtz posteo jp>]

Dear cecashon,

thanks for your code. This works currently.
I need to improve it in the future to support different plattforms
(fonts) and screen resolutions (scale).

kind
Christian


On 2018-09-10 19:32
<cecashon aol com> wrote:
>  
> Give this a try. It creates a surface, draws on it and then returns
> the surface so that it can be put in an image widget. 
>
>
> import gi
> gi.require_version('Gtk', '3.0')
> from gi.repository import Gtk, Gdk
> import cairo
>
> class MainWindow(Gtk.Window):
>     def __init__(self):
>         Gtk.Window.__init__(self)
>         self.set_title("Surface")
>         self.set_default_size(400, 400)
>         self.set_position(Gtk.WindowPosition.CENTER)
>
>         surface = self.get_surface()
>
>         image = Gtk.Image()
>         image.set_from_surface(surface)
>         image.set_vexpand(True)
>         image.set_hexpand(True)
>
>         grid = Gtk.Grid()
>         grid.attach(image, 0, 0, 1, 1)
>         self.add(grid)
>
>     def get_surface(self):
>         surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 200, 200)
>         cr = cairo.Context(surface)
>         
>         cr.set_source_rgb(0.8, 0.8, 0.8)
>         cr.paint()
>
>         cr.set_source_rgb(0.0, 1.0, 0.0)
>         cr.set_line_width(6)
>         cr.rectangle(0, 0, 200.0, 200.0) 
>         cr.stroke()
>         cr.set_source_rgb(0.0, 0.0, 1.0)
>         cr.set_line_width(3)
>         cr.move_to(0.0, 100.0)
>         cr.line_to(200.0, 100.0)
>         cr.stroke()
>         cr.move_to(100.0, 0.0)
>         cr.line_to(100.0, 200.0)
>         cr.stroke()
>
>         cr.set_source_rgb(1.0, 0.0, 1.0)
>         cr.select_font_face("Arial", cairo.FONT_SLANT_NORMAL,
> cairo.FONT_WEIGHT_BOLD) cr.set_font_size(40)
>         (x, y, width, height, dx, dy) = cr.text_extents("Cairo")
>         cr.move_to(200/2 - width/2, 200/2 + height/2)     
>         cr.show_text("Cairo")
>
>         cr.set_source_rgb(0.0, 0.0, 0.0)
>         cr.set_line_width(1)
>         cr.rectangle(200/2-width/2, 200/2 - height/2, width, height)
>         cr.stroke() 
>
>         return surface
>
> win = MainWindow()
> win.connect("delete-event", Gtk.main_quit)
> win.show_all()
> Gtk.main()
>    
>  
>  
> -----Original Message-----
> From: c.buhtz--- via gtk-app-devel-list <gtk-app-devel-list gnome org>
> To: c.buhtz--- via gtk-app-devel-list <gtk-app-devel-list gnome org>
> Cc: c.buhtz <c buhtz posteo jp>
> Sent: Sun, Sep 9, 2018 2:14 pm
> Subject: Re: "draw" icon with string
>
> On 2018-09-09 23:01 "c.buhtz--- via gtk-app-devel-list"
> <gtk-app-devel-list gnome org> wrote:
> > It is unclear to me how to create a cairo.Surface instance.
> > <https://pycairo.readthedocs.io/en/latest/reference/surfaces.html#cairo.Surface>  
>
> And I can not see any text/string drawing methods in the surface
> class. _______________________________________________
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