lib/bezier_conn.h

   1 /* Dia -- an diagram creation/manipulation program
   2  * Copyright (C) 1999 Alexander Larsson
   3  *
   4  * BezierConn  Copyright (C) 1999 James Henstridge
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20 #ifndef BEZIER_CONN_H
  21 #define BEZIER_CONN_H
  22
  23 #include "diatypes.h"
  24 #include "object.h"
  25 #include "boundingbox.h"
  26
  27 typedef enum {
  28   BEZ_CORNER_SYMMETRIC,
  29   BEZ_CORNER_SMOOTH,
  30   BEZ_CORNER_CUSP
  31 } BezCornerType;
  32
  33 /* This is a subclass of Object used to help implementing objects
  34  * that connect points with polygonal line-segments.
  35  */
  36 struct _BezierConn {
  37   /* Object must be first because this is a 'subclass' of it. */
  38   Object object;
  39
  40   int numpoints; /* >= 2 */
  41   BezPoint *points;
  42   BezCornerType *corner_types;
  43   PolyBBExtras extra_spacing;
  44 };
  45
  46 void bezierconn_update_data(BezierConn *bez);
  47 void bezierconn_update_boundingbox(BezierConn *bez);
  48 void bezierconn_simple_draw(BezierConn *bez, DiaRenderer *renderer,
  49                             real width);
  50 void bezierconn_draw_control_lines(BezierConn *bez, DiaRenderer *renderer);
  51 void bezierconn_init(BezierConn *bez, int num_points);
  52 void bezierconn_set_points(BezierConn *poly, int num_points, BezPoint *points);
  53 void bezierconn_destroy(BezierConn *bez);
  54 void bezierconn_copy(BezierConn *from, BezierConn *to);
  55 void bezierconn_save(BezierConn *bez, ObjectNode obj_node);
  56 void bezierconn_load(BezierConn *bez, ObjectNode obj_node);  /* NOTE: Does object_init() */
  57 ObjectChange *bezierconn_add_segment(BezierConn *bez, int segment, Point *point);
  58 ObjectChange *bezierconn_remove_segment(BezierConn *bez, int point);
  59 ObjectChange *bezierconn_set_corner_type(BezierConn *bez,
  60                                          Handle *handle,
  61                                          BezCornerType style);
  62 void bezierconn_move_handle(BezierConn *bez, Handle *id,
  63                             Point *to, HandleMoveReason reason);
  64 void bezierconn_move(BezierConn *bez, Point *to);
  65 real bezierconn_distance_from(BezierConn *bez, Point *point,
  66                               real line_width);
  67 Handle *bezierconn_closest_handle(BezierConn *bez, Point *point);
  68 Handle *bezierconn_closest_major_handle(BezierConn *bez, Point *point);
  69 int bezierconn_closest_segment(BezierConn *bez, Point *point,
  70                                real line_width);
  71 #endif /* BEZIER_CONN_H */