opvector3.h

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/*
    Copyright (C) 1998,1999,2000 by Jorrit Tyberghein
    Largely rewritten by Ivan Avramovic <ivan@avramovic.com>

    This library 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 library 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 library; if not, write to the Free
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef __CS_VECTOR3_H__
#define __CS_VECTOR3_H__
#include "cmd/collide2/Stdafx.h"
#include "cmd/collide2/opcodesysdef.h"

class csVector3
{
public:
  float x;
  float y;
  float z;

  csVector3 () {}

  csVector3 (float m) : x(m), y(m), z(m) {}

  csVector3 (float ix, float iy, float iz = 0) : x(ix), y(iy), z(iz) {}

  csVector3 (const csVector3& v) : x(v.x), y(v.y), z(v.z) {}
  csVector3 (const Vector v): x(v.i), y(v.j), z(v.k) {}
  inline csVector3 operator+ (const csVector3& v2) const
  { return csVector3(x+v2.x, y+v2.y, z+v2.z); }

  inline csVector3 operator- (const csVector3& v2) const
  { return csVector3(x-v2.x, y-v2.y, z-v2.z); }



  inline friend float operator* (const csVector3& v1, const csVector3& v2)
  { return v1.x*v2.x + v1.y*v2.y + v1.z*v2.z; }

  inline friend csVector3 operator% (const csVector3& v1, const csVector3& v2)
  {
    return csVector3 (v1.y*v2.z-v1.z*v2.y,
                      v1.z*v2.x-v1.x*v2.z,
                      v1.x*v2.y-v1.y*v2.x);
  }

  void Cross (const csVector3 & px, const csVector3 & py)
  {
    x = px.y*py.z - px.z*py.y;
    y = px.z*py.x - px.x*py.z;
    z = px.x*py.y - px.y*py.x;
  }

  inline void Cross (const Opcode::Point & px, const Opcode::Point & py)
  {
    x = px.y*py.z - px.z*py.y;
    y = px.z*py.x - px.x*py.z;
    z = px.x*py.y - px.y*py.x;
  }

  inline friend csVector3 operator* (const csVector3& v, float f)
  { return csVector3(v.x*f, v.y*f, v.z*f); }

  inline friend csVector3 operator* (float f, const csVector3& v)
  { return csVector3(v.x*f, v.y*f, v.z*f); }


  inline friend csVector3 operator* (const csVector3& v, int f)
  { return csVector3(v.x*f, v.y*f, v.z*f); }

  inline friend csVector3 operator* (int f, const csVector3& v)
  { return csVector3(v.x*f, v.y*f, v.z*f); }

  inline friend csVector3 operator/ (const csVector3& v, float f)
  { f = 1.0f/f; return csVector3(v.x*f, v.y*f, v.z*f); }


  inline friend csVector3 operator/ (const csVector3& v, int f)
  { float F = 1.0f/f; return csVector3(v.x*F, v.y*F, v.z*F); }

  inline friend bool operator== (const csVector3& v1, const csVector3& v2)
  { return v1.x==v2.x && v1.y==v2.y && v1.z==v2.z; }

  inline friend bool operator!= (const csVector3& v1, const csVector3& v2)
  { return v1.x!=v2.x || v1.y!=v2.y || v1.z!=v2.z; }

  inline friend csVector3 operator>> (const csVector3& v1, const csVector3& v2)
  { return ((v1*v2)*v2)/(v2*v2); }

  inline friend csVector3 operator<< (const csVector3& v1, const csVector3& v2)
  { return ((v1*v2)*v1)/(v1*v1); }

  inline friend bool operator< (const csVector3& v, float f)
  { return ABS(v.x)<f && ABS(v.y)<f && ABS(v.z)<f; }

  inline friend bool operator> (float f, const csVector3& v)
  { return ABS(v.x)<f && ABS(v.y)<f && ABS(v.z)<f; }

  inline float operator[] (int n) const { return !n?x:n&1?y:z; }

  inline float & operator[] (int n) { return !n?x:n&1?y:z; }

  inline csVector3& operator+= (const csVector3& v)
  {
    x += v.x;
    y += v.y;
    z += v.z;

    return *this;
  }

  inline csVector3& operator-= (const csVector3& v)
  {
    x -= v.x;
    y -= v.y;
    z -= v.z;

    return *this;
  }

  inline csVector3& operator*= (float f)
  { x *= f; y *= f; z *= f; return *this; }

  inline csVector3& operator/= (float f)
  { f = 1.0f / f; x *= f; y *= f; z *= f; return *this; }

  inline csVector3 operator+ () const { return *this; }

  inline csVector3 operator- () const { return csVector3(-x,-y,-z); }

  inline void Set (float sx, float sy, float sz) { x = sx; y = sy; z = sz; }

  inline void Set (const csVector3& v) { x = v.x; y = v.y; z = v.z; }

  float Norm () const;

  float SquaredNorm () const
  { return x * x + y * y + z * z; }

  csVector3 Unit () const { return (*this)/(this->Norm()); }

  inline static float Norm (const csVector3& v) { return v.Norm(); }

  inline static csVector3 Unit (const csVector3& v) { return v.Unit(); }

  void Normalize ();

  inline bool IsZero () const
  { return (x == 0) && (y == 0) && (z == 0); }
};

#endif // __CS_VECTOR3_H__