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
  21 /** \file bezier_conn.h Allows to construct object consisting of bezier lines */
  22
  23 #ifndef BEZIER_CONN_H
  24 #define BEZIER_CONN_H
  25
  26 #include "diatypes.h"
  27 #include "object.h"
  28 #include "boundingbox.h"
  29
  30 typedef enum {
  31   BEZ_CORNER_SYMMETRIC,
  32   BEZ_CORNER_SMOOTH,
  33   BEZ_CORNER_CUSP
  34 } BezCornerType;
  35
  36 /** This is a subclass of DiaObject used to help implementing objects
  37  * that connect points with polygonal line-segments.
  38  */
  39 struct _BezierConn {
  40   DiaObject object; /**< inheritance */
  41
  42   int numpoints; /**< >= 2 */
  43   BezPoint *points; /**< point data */
  44   BezCornerType *corner_types;
  45   PolyBBExtras extra_spacing;
  46 };
  47
  48 void bezierconn_update_data(BezierConn *bez);
  49 void bezierconn_update_boundingbox(BezierConn *bez);
  50 void bezierconn_simple_draw(BezierConn *bez, DiaRenderer *renderer,
  51                             real width);
  52 void bezierconn_draw_control_lines(BezierConn *bez, DiaRenderer *renderer);
  53 void bezierconn_init(BezierConn *bez, int num_points);
  54 void bezierconn_set_points(BezierConn *poly, int num_points, BezPoint *points);
  55 void bezierconn_destroy(BezierConn *bez);
  56 void bezierconn_copy(BezierConn *from, BezierConn *to);
  57 void bezierconn_save(BezierConn *bez, ObjectNode obj_node);
  58 void bezierconn_load(BezierConn *bez, ObjectNode obj_node);  /* NOTE: Does object_init() */
  59 ObjectChange *bezierconn_add_segment(BezierConn *bez, int segment, Point *point);
  60 ObjectChange *bezierconn_remove_segment(BezierConn *bez, int point);
  61 ObjectChange *bezierconn_set_corner_type(BezierConn *bez,
  62                                          Handle *handle,
  63                                          BezCornerType style);
  64 ObjectChange *bezierconn_move_handle(BezierConn *bez, Handle *id,
  65                                      Point *to, ConnectionPoint *cp,
  66                                      HandleMoveReason reason,
  67                                      ModifierKeys modifiers);
  68 ObjectChange *bezierconn_move(BezierConn *bez, Point *to);
  69 real bezierconn_distance_from(BezierConn *bez, Point *point,
  70                               real line_width);
  71 Handle *bezierconn_closest_handle(BezierConn *bez, Point *point);
  72 Handle *bezierconn_closest_major_handle(BezierConn *bez, Point *point);
  73 int bezierconn_closest_segment(BezierConn *bez, Point *point,
  74                                real line_width);
  75
  76 #define BEZCONN_COMMON_PROPERTIES \
  77   OBJECT_COMMON_PROPERTIES, \
  78   { "bez_points", PROP_TYPE_BEZPOINTARRAY, 0, "bezierconn points", NULL} \
  79
  80 #define BEZCONN_COMMON_PROPERTIES_OFFSETS \
  81   OBJECT_COMMON_PROPERTIES_OFFSETS, \
  82   { "bez_points", PROP_TYPE_BEZPOINTARRAY, \
  83      offsetof(BezierConn,points), offsetof(BezierConn,numpoints)} \
  84
  85 #endif /* BEZIER_CONN_H */