path: root/generic/Geo.h

/*
 * Geo.h -- Header for common geometric routines.
 *
 * Authors		: Patrick Lecoanet.
 * Creation date	:
 *
 * $Id$
 */

/*
 *  Copyright (c) 1993 - 1999 CENA, Patrick Lecoanet --
 *
 * This code is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This code 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this code; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */


#ifndef _Geo_h
#define _Geo_h


#include "Attrs.h"
#include "List.h"

#include <math.h>
#include <limits.h>


#ifndef MIN
#define MIN(a, b) 	((a) <= (b) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a, b) 	((a) >= (b) ? (a) : (b))
#endif
#ifndef ABS
#define ABS(a) 		((a) < 0 ? -(a) : (a))
#endif
#ifndef M_PI
#define M_PI		3.14159265358979323846264338327
#endif
#ifndef M_PI_2
#define M_PI_2		1.57079632679489661923
#endif
#ifndef M_PI_4
#define M_PI_4		0.78539816339744830962
#endif

#define PRECISION_LIMIT	1.0e-10
#define X_PRECISION_LIMIT	5.0e-2
#define LINE_END_POINTS	6

#define DegreesToRadian(angle) \
  (M_PI * (double) (angle) / 180.0)
#define RadianToDegrees(angle) \
  (fmod((angle) * 180.0 / M_PI, 360.0))
#define RadianToDegrees360(angle) \
  (fmod(RadianToDegrees(angle)+360.0,360.0))

#define REAL_TO_INT(d) \
  (((int) ((d) + (((d) > 0) ? 0.5 : -0.5))))

void
POLY_INIT(ZnPoly	*poly);
void
POLY_CONTOUR1(ZnPoly	*poly,
	      ZnPoint	*pts,
	      int	num_pts);
void
POLY_SET(ZnPoly	*poly1,
	 ZnPoly	*poly2);
void
POLY_FREE(ZnPoly	*poly);
void
TRI_STRIP1(ZnTriStrip	*tristrip,
	   ZnPoint	*pts,
	   int		num_pts);
void
TRI_FREE(ZnTriStrip	*tristrip);

void
Anchor2Origin(ZnPoint	*position,
	      ZnDim	width,
	      ZnDim	height,
	      ZnAnchor	anchor,
	      ZnPoint	*origin);
void
Origin2Anchor(ZnPoint	*origin,
	      ZnDim	width,
	      ZnDim	height,
	      ZnAnchor	anchor,
	      ZnPoint	*position);
void
BBox2XRect(ZnBBox	*bbox,
	   XRectangle	*rect);
void
GetStringBBox(char	*str,
	      ZnFont	font,
	      ZnPos	x,
	      ZnPos	y,
	      ZnBBox	*str_bbox);
void
ResetBBox(ZnBBox *bbox);
void
CopyBBox(ZnBBox *bbox_from,
	 ZnBBox *bbox_to);
void
IntersectBBox(ZnBBox *bbox1,
	      ZnBBox *bbox2,
	      ZnBBox *bbox_inter);
ZnBool
IsEmptyBBox(ZnBBox *bbox);
void
AddBBoxToBBox(ZnBBox *bbox,
	      ZnBBox *bbox2);
void
AddPointToBBox(ZnBBox	*bbox,
	       ZnPos	px,
	       ZnPos	py);
void
AddPointsToBBox(ZnBBox	*bbox,
		ZnPoint	*points,
		int	num_points);
void
AddStringToBBox(ZnBBox	*bbox,
		char	*str,
		ZnFont	font,
		ZnPos	cx,
		ZnPos	cy);
ZnBool
PointInBBox(ZnBBox	*bbox,
	    ZnPos	x,
	    ZnPos	y);

int
LineInBBox(ZnPoint	*p1,
	   ZnPoint	*p2,
	   ZnBBox	*bbox);

int
BBoxInBBox(ZnBBox	*bbox1,
	   ZnBBox	*bbox2);

int
PolylineInBBox(ZnPoint	*points,
	       int	num_points,
	       int	width,
	       int	cap_style,
	       int	join_style,
	       ZnBBox	*bbox);

int
PolygonInBBox(ZnPoint	*points,
	      int	num_points,
	      ZnBBox	*bbox,
	      ZnBool	*area_enclosed);

int
OvalInBBox(ZnPoint	*center,
	   int		width,
	   int		height,
	   ZnBBox	*bbox);

ZnBool
HorizLineToArc(ZnReal	x1,
	       ZnReal	x2,
	       ZnReal	y,
	       ZnReal	rx,
	       ZnReal	ry,
	       ZnReal	start_angle,
	       ZnReal	angle_extent);

ZnBool
VertLineToArc(ZnReal	x,
	      ZnReal	y1,
	      ZnReal	y2,
	      ZnReal	rx,
	      ZnReal	ry,
	      ZnReal	start_angle,
	      ZnReal	angle_extent);

ZnBool
PointInAngle(int	start_angle,
	     int	angle_extent,
	     ZnPoint	*p);

void
PointPolarToCartesian(ZnReal	heading,
		      int	rho,
		      int	theta,
		      ZnDim	*delta_x,
		      ZnDim	*delta_y);

ZnReal
ProjectionToAngle(ZnDim	dx,
		  ZnDim	dy);

double
RectangleToPointDist(ZnBBox	*bbox,
		     ZnPoint	*p);
double
LineToPointDist(ZnPoint	*p1,
		ZnPoint	*p2,
		ZnPoint	*p);

double
PolygonToPointDist(ZnPoint	*points,
		   int		num_points,
		   ZnPoint	*p);

double
PolylineToPointDist(ZnPoint	*points,
		    int		num_points,
		    int		width,
		    int		cap_style,
		    int		join_style,		   
		    ZnPoint	*p);

double
OvalToPointDist(ZnPoint	*center,
		int	width,
		int	height,
		unsigned int	line_width,
		ZnPoint	*p);

void
GetButtPoints(ZnPoint	*p1,
	      ZnPoint	*p2,
	      int	width,
	      ZnBool	projecting,
	      ZnPoint	*c1,
	      ZnPoint	*c2);

ZnBool
GetMiterPoints(ZnPoint	*p1,
	       ZnPoint	*p2,
	       ZnPoint	*p3,
	       int	width,
	       ZnPoint	*c1,
	       ZnPoint	*c2);

ZnBool
IntersectLines(ZnPoint	*a1,
	       ZnPoint	*a2,
	       ZnPoint	*b1,
	       ZnPoint	*b2,
	       ZnPoint	*pi);

void
ShiftLine(ZnPoint	*p1,
	  ZnPoint	*p2,
	  ZnReal	dist,
	  ZnPoint	*p3,
	  ZnPoint	*p4);

void
InsetPolygon(ZnPoint	*p,
	     int	num_points,
	     ZnDim	inset);

void
BezierSubdivide(ZnPoint	*controls,
		ZnReal	t,
		ZnBool	first);

void
SmoothPathWithBezier(ZnPoint	*from_points,
		     int	num_points,
		     ZnList	to_points);

void
GetBezierPath(ZnList	from_points,
	      ZnList	to_points);


ZnPoint *
GetCirclePoints(int	type,
		int	quality,
		ZnReal	start_angle,
		ZnReal	end_angle,
		int	*num_points,
		ZnList	point_list);

void
GetArcPath(ZnReal	start_angle,
	   ZnReal	end_angle,
	   int		type,
	   ZnList	to_points);

void
FitBezier(ZnPoint	*pts,
	  int		num_points,
	  ZnReal	error,
	  ZnList	controls);

void
GetLineEnd(ZnPoint	*p1,
	   ZnPoint	*p2,
	   unsigned int	line_width,
	   int		cap_style,
	   ZnLineEnd	end_style,
	   ZnPoint	*points);


#endif	/* _Geo_h */