lib/poly_conn.h

   1 /* Dia -- an diagram creation/manipulation program
   2  * Copyright (C) 1999 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 POLY_CONN_H
  19 #define POLY_CONN_H
  20
  21 #include "object.h"
  22 #include "boundingbox.h"
  23
  24 #define HANDLE_CORNER (HANDLE_CUSTOM1)
  25
  26 typedef struct _PolyConn PolyConn;
  27
  28 /* This is a subclass of Object used to help implementing objects
  29  * that connect points with polygonal line-segments.
  30  */
  31 struct _PolyConn {
  32   /* Object must be first because this is a 'subclass' of it. */
  33   Object object;
  34
  35   int numpoints; /* >= 2 */
  36   Point *points;
  37
  38   PolyBBExtras extra_spacing;
  39 };
  40
  41
  42 void polyconn_update_data(PolyConn *poly);
  43 void polyconn_update_boundingbox(PolyConn *poly);
  44 void polyconn_simple_draw(PolyConn *poly, Renderer *renderer, real width);
  45 void polyconn_init(PolyConn *poly, int num_points);
  46 void polyconn_set_points(PolyConn *poly, int num_points, Point *points);
  47 void polyconn_destroy(PolyConn *poly);
  48 void polyconn_copy(PolyConn *from, PolyConn *to);
  49 void polyconn_save(PolyConn *poly, ObjectNode obj_node);
  50 void polyconn_load(PolyConn *poly, ObjectNode obj_node);  /* NOTE: Does object_init() */
  51 ObjectChange *polyconn_add_point(PolyConn *poly, int segment, Point *point);
  52 ObjectChange *polyconn_remove_point(PolyConn *poly, int point);
  53 void polyconn_move_handle(PolyConn *poly, Handle *id,
  54                           Point *to, HandleMoveReason reason);
  55 void polyconn_move(PolyConn *poly, Point *to);
  56 real polyconn_distance_from(PolyConn *poly, Point *point,
  57                             real line_width);
  58 Handle *polyconn_closest_handle(PolyConn *poly, Point *point);
  59 int polyconn_closest_segment(PolyConn *poly, Point *point,
  60                              real line_width);
  61 #endif /* POLY_CONN_H */