adg/adg-canvas.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007-2008, Nicola Fontana <ntd at entidi.it>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20 /**
  21  * SECTION:canvas
  22  * @title: AdgCanvas
  23  * @short_description: The drawing container
  24  *
  25  * This container represents the object where the rendering process draws. All
  26  * the drawing must have a canvas, and only one, as master parent (as all the
  27  * #GtkWidget must have a #GtkWindow).
  28  *
  29  * Internally, the target is mantained as a #cairo_t context pointer.
  30  */
  31
  32 #include "adg-canvas.h"
  33 #include "adg-canvas-private.h"
  34 #include "adg-line-style.h"
  35 #include "adg-font-style.h"
  36 #include "adg-arrow-style.h"
  37 #include "adg-intl.h"
  38
  39 #define PARENT_CLASS ((AdgContainerClass *) adg_canvas_parent_class)
  40
  41
  42 static AdgStyle *       context_filler  (AdgStyleClass  *style_class,
  43                                          gpointer        user_data);
  44
  45
  46 G_DEFINE_TYPE(AdgCanvas, adg_canvas, ADG_TYPE_CONTAINER);
  47
  48
  49 static void
  50 adg_canvas_class_init(AdgCanvasClass *klass)
  51 {
  52     g_type_class_add_private(klass, sizeof(AdgCanvasPrivate));
  53 }
  54
  55 static void
  56 adg_canvas_init(AdgCanvas *canvas)
  57 {
  58     AdgContext *context;
  59     AdgCanvasPrivate *priv =
  60         G_TYPE_INSTANCE_GET_PRIVATE(canvas, ADG_TYPE_CANVAS,
  61                                     AdgCanvasPrivate);
  62
  63     canvas->priv = priv;
  64
  65     context = adg_context_new(context_filler, NULL);
  66     adg_entity_set_context((AdgEntity *) canvas, context);
  67     g_object_unref(context);
  68 }
  69
  70
  71 /**
  72  * adg_canvas_new:
  73  *
  74  * Creates a new empty canvas object.
  75  *
  76  * Return value: the canvas
  77  **/
  78 AdgCanvas *
  79 adg_canvas_new(void)
  80 {
  81     return g_object_new(ADG_TYPE_CANVAS, NULL);
  82 }
  83
  84
  85 static AdgStyle *
  86 context_filler(AdgStyleClass *style_class, gpointer user_data)
  87 {
  88     return adg_style_get_default(style_class);
  89 }