common.h

用C++写的几何要素类

//------------------------------------------------------------------
// Copyright 2002, softSurfer (www.softsurfer.com)
// This code may be freely used and modified for any purpose
// providing that this copyright notice is included with it.
// SoftSurfer makes no warranty for this code, and cannot be held
// liable for any real or imagined damage resulting from it's use.
// Users of this code must verify correctness for their application.
//------------------------------------------------------------------

#ifndef SS_Common_H
#define Common_H

#include <iostream.h>

enum boolean {FALSE=0, TRUE=1, ERROR=(-1)};

// Error codes
enum Error {
	Enot,	// no error
	Edim,	// error: dim of point invalid for operation
	Esum	// error: sum not affine (cooefs add to 1)
};

// utility macros
#define	abs(x)		((x) >= 0 ? x : -(x))
#define	min(x,y)	((x) < (y) ? (x) : (y))
#define	max(x,y)	((x) > (y) ? (x) : (y))

typedef long double REAL;
const REAL eps_g = 1.0e-8;
const REAL eps_l = 1.0e-5;

#endif Common_H