lib/element.h

   1 /* Dia -- an diagram creation/manipulation program
   2  * Copyright (C) 1998 Alexander Larsson
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program 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
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18 #ifndef ELEMENT_H
  19 #define ELEMENT_H
  20
  21 #include "diatypes.h"
  22 #include "object.h"
  23 #include "handle.h"
  24 #include "connectionpoint.h"
  25 #include "boundingbox.h"
  26
  27 /* This is a subclass of Object used to help implementing objects
  28  * of a type with 8 handles around ..... more info here. */
  29 struct _Element {
  30   /* Object must be first because this is a 'subclass' of it. */
  31   Object object;
  32
  33   Handle resize_handles[8];
  34
  35   Point corner;
  36   real width;
  37   real height;
  38
  39   ElementBBExtras extra_spacing;
  40 };
  41
  42 void element_update_handles(Element *elem);
  43 void element_update_boundingbox(Element *elem);
  44 void element_init(Element *elem, int num_handles, int num_connections);
  45 void element_destroy(Element *elem);
  46 void element_copy(Element *from, Element *to);
  47 void element_move_handle(Element *elem, HandleId id,
  48                          Point *to, HandleMoveReason reason);
  49 void element_move_handle_aspect(Element *elem, HandleId id,
  50                                 Point *to, real aspect_ratio);
  51
  52 void element_save(Element *elem, ObjectNode obj_node);
  53 void element_load(Element *elem, ObjectNode obj_node);
  54
  55 /* base property stuff ... */
  56 #define ELEMENT_COMMON_PROPERTIES \
  57   OBJECT_COMMON_PROPERTIES, \
  58   { "elem_corner", PROP_TYPE_POINT, 0, \
  59     "Element corner", "The corner of the element"}, \
  60   { "elem_width", PROP_TYPE_REAL, 0, \
  61     "Element width", "The width of the element"}, \
  62   { "elem_height", PROP_TYPE_REAL, 0, \
  63     "Element height", "The height of the element"}
  64
  65 #define ELEMENT_COMMON_PROPERTIES_OFFSETS \
  66   OBJECT_COMMON_PROPERTIES_OFFSETS, \
  67   { "elem_corner", PROP_TYPE_POINT, offsetof(Element, corner) }, \
  68   { "elem_width", PROP_TYPE_REAL, offsetof(Element, width) }, \
  69   { "elem_height", PROP_TYPE_REAL, offsetof(Element, height) }
  70
  71 #endif /* ELEMENT_H */