pdf2swf/spline.h

   1 /* spline.h
   2    Header file for spline.cc
   3
   4    Part of the swftools package.
   5
   6    Copyright (c) 2001,2002,2003 Matthias Kramm <kramm@quiss.org>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  21
  22 #ifndef __spline_h__
  23 #define __spline_h__
  24
  25 struct plotxy
  26 {
  27     double x,y;
  28 };
  29
  30 struct qspline
  31 {
  32     struct plotxy start;
  33     struct plotxy control;
  34     struct plotxy end;
  35 };
  36
  37 struct cspline
  38 {
  39     struct plotxy start;
  40     struct plotxy control1;
  41     struct plotxy control2;
  42     struct plotxy end;
  43 };
  44
  45 typedef enum {APPROXIMATE_INFLECTION=0, APPROXIMATE_RECURSIVE_BINARY=1} approximate_method;
  46
  47 int approximate(struct plotxy p0, struct plotxy p1, struct plotxy p2, struct plotxy p3, struct qspline*q);
  48
  49 struct plotxy splinepos(struct plotxy p0, struct plotxy p1, struct plotxy p2, struct plotxy p3, double d);
  50 double plotxy_dist(struct plotxy a, struct plotxy b);
  51
  52 plotxy cspline_getpoint(cspline*s, double t);
  53 plotxy cspline_getderivative(cspline*s, double t);
  54 plotxy cspline_getderivative2(cspline*s, double t);
  55 plotxy cspline_getderivative3(cspline*s, double t);
  56 void cspline_getequalspacedpoints(cspline*s, float**p, int*num, double dist);
  57 int cspline_approximate(struct cspline*s, struct qspline*q, double quality, approximate_method method);
  58
  59 plotxy qspline_getpoint(qspline*s, double t);
  60 plotxy qspline_getderivative(qspline*s, double t);
  61 plotxy qspline_getderivative2(qspline*s, double t);
  62 double qspline_getlength(qspline*s);
  63 void qsplines_getequalspacedpoints(qspline**s, int num, float**p, int*pnum, double t);
  64
  65 #endif// __spline_h__