vec3f.h

FreeWRLduneInputDevice和FreeWRL一起可以让用户用带有6DoF的输入设备检索3D VRML/X3D数据。它基于FreeWRL的"/tmp/inpdev"扩展传感器输入接口和w

/*
 * Vec3f.h
 *
 * Copyright (C) 1999 Stephen F. White
 * 
 * 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 (see the file "COPYING" for details); if 
 * not, write to the Free Software Foundation, Inc., 675 Mass Ave, 
 * Cambridge, MA 02139, USA.
 */

#ifndef _VEC3F_H
#define _VEC3F_H

#include <math.h>
#include <assert.h>
#include "stdafx.h"

class Vec3f {
public:
		Vec3f()
		{ x = 0.0f; y = 0.0f; z = 0.0f; }
		Vec3f(const Vec3f &v)
		{ x = v.x; y = v.y; z = v.z; }
		Vec3f(float nx, float ny, float nz)
		{ x = nx; y = ny; z = nz; }
		Vec3f(const float *v)
		{ x = v[0]; y = v[1]; z = v[2]; }

     int	operator==(const Vec3f &v) const
		{ return x == v.x && y == v.y && z == v.z; }
     int	operator!=(const Vec3f &v) const
		{ return x != v.x || y != v.y || z != v.z; }
     Vec3f	operator+(const Vec3f &v) const
		{ return Vec3f(x + v.x, y + v.y, z + v.z); }
     Vec3f	operator-(const Vec3f &v) const
		{ return Vec3f(x - v.x, y - v.y, z - v.z); }
     Vec3f	operator-() const
		{ return Vec3f(-x, -y, -z); }
     Vec3f	operator*(float f) const
		{ return Vec3f(x * f, y * f, z * f); }
     Vec3f	operator/(float f) const
		{ return Vec3f(x / f, y / f, z / f); }
     Vec3f	operator*(const Vec3f &v) const
		{ return Vec3f(x * v.x, y * v.y, z * v.z); }
     float	&operator[](int i) { 
		switch(i) {
		   case 0: return x;
		   case 1: return y;
		   case 2: return z;
                   default: assert(1);
                   }
                }
     void	zero()
		{ x = y = z = 0.0f; }
     void	scale(float s)
		{ x *= s; y *= s; z *= s; }
     float 	length() const
		{ return (float) sqrt(x * x + y * y + z * z); }
     Vec3f	cross(const Vec3f &v) const
		{ return Vec3f(y * v.z - z * v.y,
			       z * v.x - x * v.z,
			       x * v.y - y * v.x); }
     float	dot(const Vec3f &v) const
		{ return x * v.x + y * v.y + z * v.z; }
     void	normalize()
		{ float len = length();
	          if (len != 0.0f) { x /= len; y /= len; z /= len; } }
     Vec3f     &operator+=(const Vec3f &v)
		{ x += v.x;  y += v.y; z += v.z; return *this; }
public:
     float	x, y, z;
};

#endif // _VEC3F_H