/*
libspiro - conversion between spiro control points and bezier's
Copyright (C) 2007 Raph Levien
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
/* Interface routines to Raph's spiro package. */
#include "spiroentrypoints.h"
/* These two functions are kept for backwards compatibility */
void SpiroCPsToBezier(spiro_cp *spiros,int n,int isclosed,bezctx *bc) {
SpiroCPsToBezier0(spiros,n,isclosed,bc);
}
void TaggedSpiroCPsToBezier(spiro_cp *spiros,bezctx *bc) {
TaggedSpiroCPsToBezier0(spiros,bc);
}
int
SpiroCPsToBezier0(spiro_cp *spiros,int n,int isclosed,bezctx *bc)
{
spiro_seg *s;
if ( n<=0 )
return 0;
if ( isclosed )
s = run_spiro(spiros,n);
else {
char oldty_start = spiros[0].ty;
char oldty_end = spiros[n-1].ty;
spiros[0].ty = '{';
spiros[n-1].ty = '}';
s = run_spiro(spiros,n);
spiros[n-1].ty = oldty_end;
spiros[0].ty = oldty_start;
}
if (s) {
spiro_to_bpath(s,n,bc);
free_spiro(s);
return 1; // success
}
return 0 ; // spiro did not converge or encountered non-finite values
}
int
TaggedSpiroCPsToBezier0(spiro_cp *spiros,bezctx *bc)
{
spiro_seg *s;
int n;
for ( n=0; spiros[n].ty!='z' && spiros[n].ty!='}'; ++n );
if ( spiros[n].ty == '}' ) ++n;
if ( n<=0 ) return 0; // invalid input
s = run_spiro(spiros,n);
if (s) {
spiro_to_bpath(s,n,bc);
free_spiro(s);
return 1; // success
}
return 0 ; // spiro did not converge or encountered non-finite values
}
void SpiroCPsToBezier1(spiro_cp *spiros,int n,int isclosed,bezctx *bc,int *done) {
*done = SpiroCPsToBezier0(spiros,n,isclosed,bc);
}
void TaggedSpiroCPsToBezier1(spiro_cp *spiros,bezctx *bc,int *done) {
*done = TaggedSpiroCPsToBezier0(spiros,bc);
}