src/display/gnome-canvas-acetate.cpp

   1 #define __SP_CANVAS_ACETATE_C__
   2
   3 /*
   4  * Infinite invisible canvas item
   5  *
   6  * Author:
   7  *   Federico Mena <federico@nuclecu.unam.mx>
   8  *   Raph Levien <raph@acm.org>
   9  *   Lauris Kaplinski <lauris@kaplinski.com>
  10  *
  11  * Copyright (C) 1998-1999 The Free Software Foundation
  12  * Copyright (C) 2002 Lauris Kaplinski
  13  *
  14  * Released under GNU GPL, read the file 'COPYING' for more information
  15  */
  16
  17 #include "gnome-canvas-acetate.h"
  18
  19 static void sp_canvas_acetate_class_init (SPCanvasAcetateClass *klass);
  20 static void sp_canvas_acetate_init (SPCanvasAcetate *acetate);
  21 static void sp_canvas_acetate_destroy (GtkObject *object);
  22
  23 static void sp_canvas_acetate_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags);
  24 static double sp_canvas_acetate_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item);
  25
  26 static SPCanvasItemClass *parent_class;
  27
  28 GtkType
  29 sp_canvas_acetate_get_type (void)
  30 {
  31         static GtkType acetate_type = 0;
  32         if (!acetate_type) {
  33                 GtkTypeInfo acetate_info = {
  34                         (gchar *)"SPCanvasAcetate",
  35                         sizeof (SPCanvasAcetate),
  36                         sizeof (SPCanvasAcetateClass),
  37                         (GtkClassInitFunc) sp_canvas_acetate_class_init,
  38                         (GtkObjectInitFunc) sp_canvas_acetate_init,
  39                         NULL, NULL, NULL
  40                 };
  41                 acetate_type = gtk_type_unique (sp_canvas_item_get_type (), &acetate_info);
  42         }
  43         return acetate_type;
  44 }
  45
  46 static void
  47 sp_canvas_acetate_class_init (SPCanvasAcetateClass *klass)
  48 {
  49         GtkObjectClass *object_class;
  50         SPCanvasItemClass *item_class;
  51
  52         object_class = (GtkObjectClass *) klass;
  53         item_class = (SPCanvasItemClass *) klass;
  54
  55         parent_class = (SPCanvasItemClass*)gtk_type_class (sp_canvas_item_get_type ());
  56
  57         object_class->destroy = sp_canvas_acetate_destroy;
  58
  59         item_class->update = sp_canvas_acetate_update;
  60         item_class->point = sp_canvas_acetate_point;
  61 }
  62
  63 static void
  64 sp_canvas_acetate_init (SPCanvasAcetate */*acetate*/)
  65 {
  66     /* Nothing here */
  67 }
  68
  69 static void
  70 sp_canvas_acetate_destroy (GtkObject *object)
  71 {
  72         SPCanvasAcetate *acetate;
  73
  74         g_return_if_fail (object != NULL);
  75         g_return_if_fail (GNOME_IS_CANVAS_ACETATE (object));
  76
  77         acetate = SP_CANVAS_ACETATE (object);
  78
  79         if (GTK_OBJECT_CLASS (parent_class)->destroy)
  80                 (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
  81 }
  82
  83 static void
  84 sp_canvas_acetate_update( SPCanvasItem *item, Geom::Matrix const &/*affine*/, unsigned int /*flags*/ )
  85 {
  86     item->x1 = -G_MAXINT;
  87     item->y1 = -G_MAXINT;
  88     item->x2 = G_MAXINT;
  89     item->y2 = G_MAXINT;
  90 }
  91
  92 static double
  93 sp_canvas_acetate_point( SPCanvasItem *item, Geom::Point /*p*/, SPCanvasItem **actual_item )
  94 {
  95     *actual_item = item;
  96
  97     return 0.0;
  98 }
  99