adg/adg-canvas.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007,2008,2009 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 /**
  22  * SECTION:adg-canvas
  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 /**
  33  * AdgCanvas:
  34  *
  35  * All fields are private and should not be used directly.
  36  * Use its public methods instead.
  37  **/
  38
  39
  40 #include "adg-canvas.h"
  41 #include "adg-canvas-private.h"
  42 #include "adg-line-style.h"
  43 #include "adg-font-style.h"
  44 #include "adg-arrow-style.h"
  45 #include "adg-intl.h"
  46
  47
  48 static AdgStyle *       context_filler  (AdgStyleClass  *style_class,
  49                                          gpointer        user_data);
  50
  51
  52 G_DEFINE_TYPE(AdgCanvas, adg_canvas, ADG_TYPE_CONTAINER);
  53
  54
  55 static void
  56 adg_canvas_class_init(AdgCanvasClass *klass)
  57 {
  58     g_type_class_add_private(klass, sizeof(AdgCanvasPrivate));
  59 }
  60
  61 static void
  62 adg_canvas_init(AdgCanvas *canvas)
  63 {
  64     AdgContext *context;
  65     AdgCanvasPrivate *data = G_TYPE_INSTANCE_GET_PRIVATE(canvas,
  66                                                          ADG_TYPE_CANVAS,
  67                                                          AdgCanvasPrivate);
  68
  69     canvas->data = data;
  70
  71     context = adg_context_new(context_filler, NULL);
  72     adg_entity_set_context((AdgEntity *) canvas, context);
  73     g_object_unref(context);
  74 }
  75
  76
  77 /**
  78  * adg_canvas_new:
  79  *
  80  * Creates a new empty canvas object.
  81  *
  82  * Returns: the canvas
  83  **/
  84 AdgCanvas *
  85 adg_canvas_new(void)
  86 {
  87     return g_object_new(ADG_TYPE_CANVAS, NULL);
  88 }
  89
  90
  91 static AdgStyle *
  92 context_filler(AdgStyleClass *style_class, gpointer user_data)
  93 {
  94     return adg_style_get_default(style_class);
  95 }