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/** \file utility.h
* Prototypes for misc utility functions
*/
/* XTrkCad - Model Railroad CAD
* Copyright (C) 2005 Dave Bullis
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef UTILITY_H
#define UTILITY_H
#include "common.h"
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
#define EPSILON (0.000001)
#ifdef small
#undef small
#endif
#define small(r) (r < EPSILON && r > -EPSILON)
extern DEBUGF_T debugIntersection;
#ifndef max
double max( double a, double b );
double min( double a, double b );
#endif
double FindDistance( coOrd p0, coOrd p1 );
double NormalizeAngle( double a );
double DifferenceBetweenAngles(double a, double b);
int AngleInRange(double a, double start, double size);
int IsAligned( double a1, double a2 );
double D2R( double D );
double R2D( double R );
void Rotate( coOrd *p, coOrd orig, double angle );
void Translate( coOrd *res, coOrd orig, double a, double d );
double FindAngle( coOrd p0, coOrd p1 );
int PointOnCircle( coOrd * resP, coOrd center, double radius, double angle );
double ConstrainR( double r );
void FindPos( coOrd * res, double * beyond, coOrd pos, coOrd orig, double angle, double length );
int FindIntersection( coOrd *Pc, coOrd P00, double A0, coOrd P10, double A1 );
double LineDistance( coOrd *p, coOrd p0, coOrd p1 );
double CircleDistance( coOrd *p, coOrd c, double r, double a0, double a1 );
int PickArcEndPt( coOrd, coOrd, coOrd );
int PickLineEndPt( coOrd, double, coOrd );
coOrd AddCoOrd( coOrd, coOrd, double );
int ClipLine( coOrd *, coOrd *, coOrd, double, coOrd );
#endif
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