lib/beziershape.h

   1 /* Dia -- an diagram creation/manipulation program
   2  * Copyright (C) 1999 Alexander Larsson
   3  *
   4  * beziershape.h - code to help implement bezier shapes
   5  * Copyright (C) 2000 James Henstridge
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 /** \file beziershape.h Allows to construct closed objects consisting of bezier lines */
  23
  24 #ifndef BEZIERSHAPE_H
  25 #define BEZIERSHAPE_H
  26
  27 #include "diatypes.h"
  28 #include "object.h"
  29 /* for BezCornerType */
  30 #include "bezier_conn.h"
  31
  32 #define HANDLE_CORNER (HANDLE_CUSTOM1)
  33
  34 /* This is a subclass of DiaObject used to help implementing objects
  35  * that form a polygon-like shape of line-segments.
  36  */
  37 struct _BezierShape {
  38   /* DiaObject must be first because this is a 'subclass' of it. */
  39   DiaObject object;
  40
  41   int numpoints; /* >= 2 */
  42   BezPoint *points;
  43   BezCornerType *corner_types;
  44   ElementBBExtras extra_spacing;
  45 };
  46
  47 void beziershape_update_data(BezierShape *bezier);
  48 void beziershape_update_boundingbox(BezierShape *bezier);
  49 void beziershape_simple_draw(BezierShape *bezier, DiaRenderer *renderer,
  50                              real width);
  51 void beziershape_init(BezierShape *bezier, int num_points);
  52 void beziershape_set_points(BezierShape *bezier, int num_points, BezPoint *points);
  53 void beziershape_destroy(BezierShape *bezier);
  54 void beziershape_copy(BezierShape *from, BezierShape *to);
  55 void beziershape_save(BezierShape *bezier, ObjectNode obj_node);
  56 /* NOTE: Does object_init() */
  57 void beziershape_load(BezierShape *bezier, ObjectNode obj_node);
  58 ObjectChange *beziershape_add_segment(BezierShape *bezier, int segment,
  59                                       Point *point);
  60 ObjectChange *beziershape_remove_segment(BezierShape *bezier, int point);
  61 ObjectChange *beziershape_set_corner_type(BezierShape *bez, Handle *handle,
  62                                           BezCornerType corner_type);
  63 ObjectChange *beziershape_move_handle(BezierShape *bezier, Handle *id,
  64                                       Point *to, ConnectionPoint *cp,
  65                                       HandleMoveReason reason,
  66                                       ModifierKeys modifiers);
  67 ObjectChange *beziershape_move(BezierShape *bezier, Point *to);
  68 real beziershape_distance_from(BezierShape *bezier, Point *point,
  69                                real line_width);
  70 Handle *beziershape_closest_handle(BezierShape *bezier, Point *point);
  71 Handle *beziershape_closest_major_handle(BezierShape *bezier, Point *point);
  72 int beziershape_closest_segment(BezierShape *bezier, Point *point,
  73                                 real line_width);
  74 void beziershape_draw_control_lines(BezierShape *bez, DiaRenderer *renderer);
  75
  76 #define BEZSHAPE_COMMON_PROPERTIES \
  77   OBJECT_COMMON_PROPERTIES, \
  78   { "bez_points", PROP_TYPE_BEZPOINTARRAY, 0, "beziershape points", NULL} \
  79
  80 #define BEZSHAPE_COMMON_PROPERTIES_OFFSETS \
  81   OBJECT_COMMON_PROPERTIES_OFFSETS, \
  82   { "bez_points", PROP_TYPE_BEZPOINTARRAY, \
  83      offsetof(BezierShape,points), offsetof(BezierShape,numpoints)} \
  84
  85 #endif /* BEZIER_SHAPE_H */