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/*
ppedit - A pattern plate editor for Spiro splines.
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 2
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.
*/
#include <x3.h>
#include "zmisc.h"
#include "bezctx.h"
#include "bezctx_x3.h"
typedef struct {
bezctx base;
x3dc *dc;
int is_open;
} bezctx_x3;
static void
bezctx_x3_moveto(bezctx *z, double x, double y, int is_open) {
bezctx_x3 *bc = (bezctx_x3 *)z;
if (!bc->is_open) x3closepath(bc->dc);
x3moveto(bc->dc, x, y);
bc->is_open = is_open;
}
void
bezctx_x3_lineto(bezctx *z, double x, double y) {
bezctx_x3 *bc = (bezctx_x3 *)z;
x3lineto(bc->dc, x, y);
}
void
bezctx_x3_quadto(bezctx *z, double x1, double y1, double x2, double y2)
{
bezctx_x3 *bc = (bezctx_x3 *)z;
double x0, y0;
x3getcurrentpoint(bc->dc, &x0, &y0);
x3curveto(bc->dc,
x1 + (1./3) * (x0 - x1),
y1 + (1./3) * (y0 - y1),
x1 + (1./3) * (x2 - x1),
y1 + (1./3) * (y2 - y1),
x2,
y2);
}
void
bezctx_x3_curveto(bezctx *z, double x1, double y1, double x2, double y2,
double x3, double y3)
{
bezctx_x3 *bc = (bezctx_x3 *)z;
x3curveto(bc->dc, x1, y1, x2, y2, x3, y3);
}
void
bezctx_x3_finish(bezctx *z)
{
bezctx_x3 *bc = (bezctx_x3 *)z;
if (!bc->is_open)
x3closepath(bc->dc);
zfree(bc);
}
bezctx *
new_bezctx_x3(x3dc *dc) {
bezctx_x3 *result = znew(bezctx_x3, 1);
result->base.moveto = bezctx_x3_moveto;
result->base.lineto = bezctx_x3_lineto;
result->base.quadto = bezctx_x3_quadto;
result->base.curveto = bezctx_x3_curveto;
result->base.mark_knot = NULL;
result->dc = dc;
result->is_open = 1;
return &result->base;
}
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