Re.: GtkDrawingArea size request

[Rúben Rodrigues <ruben_gr live com pt>]

Solved.

Someone have a example of how to create a custom widget with cairo in C?
Thanks

-------- Mensagem original --------
Assunto: Fwd: GtkDrawingArea size request
De: Rúben Rodrigues
Para: gtk-app-devel-list gnome org
CC:

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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