Re: Fwd: GtkDrawingArea size request

[Chris Moller <moller mollerware com>]

There's no reason the drawing area code you're showing shouldn't work.  
The most obvious possibility is that the size of your enclosing widget 
(GTK_BOX(gtk_builder_get_object(builder, "box30"))) isn't set right--the 
default is that your drawing area will expand to fill its parent.

On 06/21/17 10:11, Rúben Rodrigues wrote:
> Someone received my question?
>
> Thanks
>
>
> -------- Mensagem reencaminhada --------
> Assunto:        GtkDrawingArea size request
> Data:   Wed, 21 Jun 2017 10:08:15 +0100
> De:     Rúben Rodrigues <ruben_gr live com pt><mailto:ruben_gr live com pt>
> Para:   gtk-app-devel-list gnome org<mailto:gtk-app-devel-list gnome org> <gtk-app-devel-list gnome 
> org><mailto:gtk-app-devel-list gnome org>
>
>
>
> Hi,
>
> I create a drawing area to draw a circular gauge with cairo.
>
> GtkWidget *drawing_area = gtk_drawing_area_new ();
>      gtk_widget_set_size_request (drawing_area, 100, 100);
>      gtk_box_pack_start (GTK_BOX(gtk_builder_get_object(builder,
> "box30")),drawing_area,FALSE,TRUE,0);
>
> The problem is that the drawing area is not 100x100 but the entire of
> screen.
>
> This is the callback function:
>
>
>
> gboolean on_circular_gauge_draw(GtkWidget *widget, cairo_t *cr,
>      gpointer user_data)
> {
>
>        int width, height;
>        gint percentage, linewidth;
>
>        width = gtk_widget_get_allocated_width (widget);
>        height = gtk_widget_get_allocated_height (widget);
>
>
>        linewidth = (MIN (width, height) / 2.0 * 30.0) / 100.0;
>
>        cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
>        cairo_set_line_width (cr, linewidth);
>        cairo_arc(cr, width/2.0, height/2.0,  MIN (width, height) / 2.0 -
> linewidth, angle1, angle2);
>        cairo_stroke (cr);
>
>        cairo_set_source_rgba (cr, 0.0, 0.9, 0.0, 1.0);
>        cairo_set_line_width (cr, linewidth);
>        cairo_arc(cr, width/2.0, height/2.0, MIN (width, height) / 2.0  -
> linewidth, 180.0  * (M_PI/180.0),315.0  * (M_PI/180.0) );
>        cairo_stroke (cr);
>
>
>
>    return FALSE;
> }
>
>
>
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