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 #ifndef BEZIERSHAPE_H
  22 #define BEZIERSHAPE_H
  23
  24 #include "diatypes.h"
  25 #include "object.h"
  26 /* for BezCornerType */
  27 #include "bezier_conn.h"
  28
  29 #define HANDLE_CORNER (HANDLE_CUSTOM1)
  30
  31 /* This is a subclass of Object used to help implementing objects
  32  * that form a polygon-like shape of line-segments.
  33  */
  34 struct _BezierShape {
  35   /* Object must be first because this is a 'subclass' of it. */
  36   Object object;
  37
  38   int numpoints; /* >= 2 */
  39   BezPoint *points;
  40   BezCornerType *corner_types;
  41   ElementBBExtras extra_spacing;
  42 };
  43
  44 void beziershape_update_data(BezierShape *bezier);
  45 void beziershape_update_boundingbox(BezierShape *bezier);
  46 void beziershape_simple_draw(BezierShape *bezier, DiaRenderer *renderer,
  47                              real width);
  48 void beziershape_init(BezierShape *bezier, int num_points);
  49 void beziershape_set_points(BezierShape *bezier, int num_points, BezPoint *points);
  50 void beziershape_destroy(BezierShape *bezier);
  51 void beziershape_copy(BezierShape *from, BezierShape *to);
  52 void beziershape_save(BezierShape *bezier, ObjectNode obj_node);
  53 /* NOTE: Does object_init() */
  54 void beziershape_load(BezierShape *bezier, ObjectNode obj_node);
  55 ObjectChange *beziershape_add_segment(BezierShape *bezier, int segment,
  56                                       Point *point);
  57 ObjectChange *beziershape_remove_segment(BezierShape *bezier, int point);
  58 ObjectChange *beziershape_set_corner_type(BezierShape *bez, Handle *handle,
  59                                           BezCornerType corner_type);
  60 void beziershape_move_handle(BezierShape *bezier, Handle *id,
  61                              Point *to, HandleMoveReason reason);
  62 void beziershape_move(BezierShape *bezier, Point *to);
  63 real beziershape_distance_from(BezierShape *bezier, Point *point,
  64                                real line_width);
  65 Handle *beziershape_closest_handle(BezierShape *bezier, Point *point);
  66 Handle *beziershape_closest_major_handle(BezierShape *bezier, Point *point);
  67 int beziershape_closest_segment(BezierShape *bezier, Point *point,
  68                                 real line_width);
  69 void beziershape_draw_control_lines(BezierShape *bez, DiaRenderer *renderer);
  70 #endif /* BEZIER_SHAPE_H */