/* Copyright (C) 1989, 1990 Aladdin Enterprises.  All rights reserved.
   Distributed by Free Software Foundation, Inc.

This file is part of Ghostscript.

Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.  Refer
to the Ghostscript General Public License for full details.

Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License.  A copy of this license is supposed to have been
given to you along with Ghostscript so you can know your rights and
responsibilities.  It should be in a file named COPYING.  Among other
things, the copyright notice and this notice must be preserved on all
copies.  */

/* zpath.c */
/* Path operators for GhostScript */
#include "math_.h"
#include "ghost.h"
#include "errors.h"
#include "oper.h"
#include "gsmatrix.h"
#include "gspath.h"
#include "state.h"
#include "store.h"

/* Forward references */
private int common_to(P2(ref *,
  int (*)(P3(gs_state *, floatp, floatp))));
private int common_arc(P2(ref *,
  int (*)(P6(gs_state *, floatp, floatp, floatp, floatp, floatp))));
private int common_arct(P2(ref *, float *));
private int common_curve(P2(ref *,
  int (*)(P7(gs_state *, floatp, floatp, floatp, floatp, floatp, floatp))));

/* Imported from util.c */
extern int num_params(P3(ref *, int, float *));

/* Imported from zmath.c */
extern double degrees_to_radians, radians_to_degrees;

/* newpath */
int
znewpath(register ref *op)
{	return gs_newpath(igs);
}

/* currentpoint */
int
zcurrentpoint(register ref *op)
{	gs_point pt;
	int code = gs_currentpoint(igs, &pt);
	if ( code < 0 ) return code;
	push(2);
	make_real(op - 1, pt.x);
	make_real(op, pt.y);
	return 0;
}

/* moveto */
int
zmoveto(register ref *op)
{	return common_to(op, gs_moveto);
}

/* rmoveto */
int
zrmoveto(register ref *op)
{	return common_to(op, gs_rmoveto);
}

/* lineto */
int
zlineto(register ref *op)
{	return common_to(op, gs_lineto);
}

/* rlineto */
int
zrlineto(register ref *op)
{	return common_to(op, gs_rlineto);
}

/* Common code for [r](move/line)to */
private int
common_to(ref *op, int (*add_proc)(P3(gs_state *, floatp, floatp)))
{	float opxy[2];
	int code;
	if (	(code = num_params(op, 2, opxy)) < 0 ||
		(code = (*add_proc)(igs, opxy[0], opxy[1])) < 0
	   ) return code;
	pop(2);
	return 0;
}

/* arc */
int
zarc(register ref *op)
{	return common_arc(op, gs_arc);
}

/* arcn */
int
zarcn(register ref *op)
{	return common_arc(op, gs_arcn);
}

/* Common code for arc[n] */
private int
common_arc(ref *op,
  int (*aproc)(P6(gs_state *, floatp, floatp, floatp, floatp, floatp)))
{	float xyra[5];			/* x, y, r, ang1, ang2 */
	int code;
	if ( (code = num_params(op, 5, xyra)) < 0 ) return code;
	code = (*aproc)(igs, xyra[0], xyra[1], xyra[2], xyra[3], xyra[4]);
	if ( code >= 0 ) pop(5);
	return code;
}

/* arct */
int
zarct(register ref *op)
{	int code = common_arct(op, (float *)0);
	if ( code < 0 ) return code;
	pop(5);
	return 0;
}

/* arcto */
int
zarcto(register ref *op)
{	float tanxy[4];			/* xt1, yt1, xt2, yt2 */
	int code = common_arct(op, tanxy);
	if ( code < 0 ) return code;
	make_real(op - 4, tanxy[0]);
	make_real(op - 3, tanxy[1]);
	make_real(op - 2, tanxy[2]);
	make_real(op - 1, tanxy[3]);
	pop(1);
	return 0;
}

/* Common code for arct[o] */
private int
common_arct(ref *op, float *tanxy)
{	float args[5];			/* x1, y1, x2, y2, r */
	int code;
	if ( (code = num_params(op, 5, args)) < 0 ) return code;
	return gs_arcto(igs, args[0], args[1], args[2], args[3], args[4], tanxy);
}

/* curveto */
int
zcurveto(register ref *op)
{	return common_curve(op, gs_curveto);
}

/* rcurveto */
int
zrcurveto(register ref *op)
{	return common_curve(op, gs_rcurveto);
}

/* Common code for [r]curveto */
private int
common_curve(ref *op,
  int (*add_proc)(P7(gs_state *, floatp, floatp, floatp, floatp, floatp, floatp)))
{	float opxy[6];
	int code;
	if ( (code = num_params(op, 6, opxy)) < 0 ) return code;
	code = (*add_proc)(igs, opxy[0], opxy[1], opxy[2], opxy[3], opxy[4], opxy[5]);
	if ( code >= 0 ) pop(6);
	return code;
}

/* closepath */
int
zclosepath(register ref *op)
{	return gs_closepath(igs);
}

/* ------ Initialization procedure ------ */

void
zpath_op_init()
{	static op_def my_defs[] = {
		{"5arc", zarc},
		{"5arcn", zarcn},
		{"5arct", zarct},
		{"5arcto", zarcto},
		{"0closepath", zclosepath},
		{"0currentpoint", zcurrentpoint},
		{"6curveto", zcurveto},
		{"2lineto", zlineto},
		{"2moveto", zmoveto},
		{"0newpath", znewpath},
		{"6rcurveto", zrcurveto},
		{"2rlineto", zrlineto},
		{"2rmoveto", zrmoveto},
		op_def_end
	};
	z_op_init(my_defs);
}