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 "display-forward.h"
  18 #include "gnome-canvas-acetate.h"
  19
  20 static void sp_canvas_acetate_class_init (SPCanvasAcetateClass *klass);
  21 static void sp_canvas_acetate_init (SPCanvasAcetate *acetate);
  22 static void sp_canvas_acetate_destroy (GtkObject *object);
  23
  24 static void sp_canvas_acetate_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags);
  25 static double sp_canvas_acetate_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item);
  26
  27 static SPCanvasItemClass *parent_class;
  28
  29 GtkType
  30 sp_canvas_acetate_get_type (void)
  31 {
  32         static GtkType acetate_type = 0;
  33         if (!acetate_type) {
  34                 GtkTypeInfo acetate_info = {
  35                         (gchar *)"SPCanvasAcetate",
  36                         sizeof (SPCanvasAcetate),
  37                         sizeof (SPCanvasAcetateClass),
  38                         (GtkClassInitFunc) sp_canvas_acetate_class_init,
  39                         (GtkObjectInitFunc) sp_canvas_acetate_init,
  40                         NULL, NULL, NULL
  41                 };
  42                 acetate_type = gtk_type_unique (sp_canvas_item_get_type (), &acetate_info);
  43         }
  44         return acetate_type;
  45 }
  46
  47 static void
  48 sp_canvas_acetate_class_init (SPCanvasAcetateClass *klass)
  49 {
  50         GtkObjectClass *object_class;
  51         SPCanvasItemClass *item_class;
  52
  53         object_class = (GtkObjectClass *) klass;
  54         item_class = (SPCanvasItemClass *) klass;
  55
  56         parent_class = (SPCanvasItemClass*)gtk_type_class (sp_canvas_item_get_type ());
  57
  58         object_class->destroy = sp_canvas_acetate_destroy;
  59
  60         item_class->update = sp_canvas_acetate_update;
  61         item_class->point = sp_canvas_acetate_point;
  62 }
  63
  64 static void
  65 sp_canvas_acetate_init (SPCanvasAcetate */*acetate*/)
  66 {
  67     /* Nothing here */
  68 }
  69
  70 static void
  71 sp_canvas_acetate_destroy (GtkObject *object)
  72 {
  73         SPCanvasAcetate *acetate;
  74
  75         g_return_if_fail (object != NULL);
  76         g_return_if_fail (GNOME_IS_CANVAS_ACETATE (object));
  77
  78         acetate = SP_CANVAS_ACETATE (object);
  79
  80         if (GTK_OBJECT_CLASS (parent_class)->destroy)
  81                 (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
  82 }
  83
  84 static void
  85 sp_canvas_acetate_update( SPCanvasItem *item, Geom::Matrix const &/*affine*/, unsigned int /*flags*/ )
  86 {
  87     item->x1 = -G_MAXINT;
  88     item->y1 = -G_MAXINT;
  89     item->x2 = G_MAXINT;
  90     item->y2 = G_MAXINT;
  91 }
  92
  93 static double
  94 sp_canvas_acetate_point( SPCanvasItem *item, Geom::Point /*p*/, SPCanvasItem **actual_item )
  95 {
  96     *actual_item = item;
  97
  98     return 0.0;
  99 }
 100