/********************************************************************************
* *
* S i n g l e - P r e c i s i o n Q u a t e r n i o n *
* *
*********************************************************************************
* Copyright (C) 1994,2024 by Jeroen van der Zijp. All Rights Reserved. *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 3 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 Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see *
********************************************************************************/
#ifndef FXQUATF_H
#define FXQUATF_H
namespace FX {
// Forward reference
class FXMat3f;
/// Single-precision quaternion
class FXAPI FXQuatf {
public:
FXfloat x;
FXfloat y;
FXfloat z;
FXfloat w;
public:
/**
* Default constructor; value is not initialized.
*/
FXQuatf(){}
/**
* Copy constructor.
*/
FXQuatf(const FXQuatf& q):x(q.x),y(q.y),z(q.z),w(q.w){}
/**
* Construct from array of four floats.
*/
FXQuatf(const FXfloat v[]):x(v[0]),y(v[1]),z(v[2]),w(v[3]){}
/**
* Construct from four components.
*/
FXQuatf(FXfloat xx,FXfloat yy,FXfloat zz,FXfloat ww):x(xx),y(yy),z(zz),w(ww){}
/**
* Construct from rotation axis and angle in radians.
*/
FXQuatf(const FXVec3f& axis,FXfloat phi);
/**
* Construct quaternion from arc between two unit vectors fm and to.
*/
FXQuatf(const FXVec3f& fr,const FXVec3f& to);
/**
* Construct from euler angles yaw (z), pitch (y), and roll (x).
*/
FXQuatf(FXfloat roll,FXfloat pitch,FXfloat yaw);
/**
* Construct quaternion from three orthogonal unit vectors.
*/
FXQuatf(const FXVec3f& ex,const FXVec3f& ey,const FXVec3f& ez);
/**
* Construct quaternion from rotation vector rot, representing a rotation
* by |rot| radians about a unit vector rot/|rot|.
*/
FXQuatf(const FXVec3f& rot);
/**
* Return a non-const reference to the ith element.
*/
FXfloat& operator[](FXint i){return (&x)[i];}
/**
* Return a const reference to the ith element.
*/
const FXfloat& operator[](FXint i) const {return (&x)[i];}
/**
* Assignment from other quaternion.
*/
FXQuatf& operator=(const FXQuatf& v){x=v.x;y=v.y;z=v.z;w=v.w;return *this;}
/**
* Assignment from array of four floats.
*/
FXQuatf& operator=(const FXfloat v[]){x=v[0];y=v[1];z=v[2];w=v[3];return *this;}
/**
* Set value from another quaternion.
*/
FXQuatf& set(const FXQuatf& v){x=v.x;y=v.y;z=v.z;w=v.w;return *this;}
/**
* Set value from array of four floats.
*/
FXQuatf& set(const FXfloat v[]){x=v[0];y=v[1];z=v[2];w=v[3];return *this;}
/**
* Set value from four components.
*/
FXQuatf& set(FXfloat xx,FXfloat yy,FXfloat zz,FXfloat ww){x=xx;y=yy;z=zz;w=ww;return *this;}
/// Assigning operators
FXQuatf& operator*=(FXfloat n){ return set(x*n,y*n,z*n,w*n); }
FXQuatf& operator/=(FXfloat n){ return set(x/n,y/n,z/n,w/n); }
FXQuatf& operator+=(const FXQuatf& v){ return set(x+v.x,y+v.y,z+v.z,w+v.w); }
FXQuatf& operator-=(const FXQuatf& v){ return set(x-v.x,y-v.y,z-v.z,w-v.w); }
FXQuatf& operator*=(const FXQuatf& b){ return set(w*b.x+x*b.w+y*b.z-z*b.y, w*b.y+y*b.w+z*b.x-x*b.z, w*b.z+z*b.w+x*b.y-y*b.x, w*b.w-x*b.x-y*b.y-z*b.z); }
FXQuatf& operator/=(const FXQuatf& b){ return *this*=b.invert(); }
/// Conversion
operator FXfloat*(){return &x;}
operator const FXfloat*() const {return &x;}
/// Conversion to 3-vector, axis of rotation
operator FXVec3f&(){return *reinterpret_cast(this);}
operator const FXVec3f&() const {return *reinterpret_cast(this);}
/// Test if zero
FXbool operator!() const {return x==0.0f && y==0.0f && z==0.0f && w==0.0f; }
/// Unary
FXQuatf operator+() const { return *this; }
FXQuatf operator-() const { return FXQuatf(-x,-y,-z,-w); }
/// Length and square of length
FXfloat length2() const { return w*w+z*z+y*y+x*x; }
FXfloat length() const { return Math::sqrt(length2()); }
/// Adjust quaternion length
FXQuatf& adjust();
/**
* Set quaternion from axis and angle.
* Quaternion represents a rotation of phi radians about unit vector axis.
*/
void setAxisAngle(const FXVec3f& axis,FXfloat phi);
/**
* Obtain axis and angle from quaternion.
* Return unit vector and angle of rotation phi, in radians.
* If identity quaternion (0,0,0,1), return axis as (1,0.0).
*/
void getAxisAngle(FXVec3f& axis,FXfloat& phi) const;
/**
* Set quaternion from rotation vector rot, representing a rotation by |rot| radians
* about a unit vector rot/|rot|. Set to the identity quaternion (0,0,0,1) if the rotation
* vector is equal to (0,0,0).
*/
void setRotation(const FXVec3f& rot);
/**
* Get rotation vector from quaternion, representing a rotation of |rot| radians
* about an axis rot/|rot|. If quaternion is identity quaternion (0,0,0,1), return (0,0,0).
*/
FXVec3f getRotation() const;
/**
* Set unit quaternion to modified rodrigues parameters.
* Modified Rodriques parameters are defined as MRP = tan(theta/4)*E,
* where theta is rotation angle (radians), and E is unit axis of rotation.
*/
void setMRP(const FXVec3f& m);
/**
* Return modified rodrigues parameters from unit quaternion.
*/
FXVec3f getMRP() const;
/// Set quaternion from roll (x), pitch (y), yaw (z), in that order
void setRollPitchYaw(FXfloat roll,FXfloat pitch,FXfloat yaw);
/// Return the roll (x), pitch (y), yaw (z) angles represented by the quaternion
void getRollPitchYaw(FXfloat& roll,FXfloat& pitch,FXfloat& yaw) const;
/// Set quaternion from yaw (z), pitch (y), roll (x), in that order
void setYawPitchRoll(FXfloat yaw,FXfloat pitch,FXfloat roll);
/// Return the yaw (z), pitch (y), roll (x) angles represented by the quaternion
void getYawPitchRoll(FXfloat& yaw,FXfloat& pitch,FXfloat& roll) const;
/// Set quaternion from roll (x), yaw (z), pitch (y), in that order
void setRollYawPitch(FXfloat roll,FXfloat yaw,FXfloat pitch);
/// Return the roll (x), yaw (z), pitch (y) angles represented by the quaternion
void getRollYawPitch(FXfloat& roll,FXfloat& yaw,FXfloat& pitch) const;
/// Set quaternion from pitch (y), roll (x),yaw (z), in that order
void setPitchRollYaw(FXfloat pitch,FXfloat roll,FXfloat yaw);
/// Return the pitch (y), roll (x),yaw (z) angles represented by the quaternion
void getPitchRollYaw(FXfloat& pitch,FXfloat& roll,FXfloat& yaw) const;
/// Set quaternion from pitch (y), yaw (z), roll (x), in that order
void setPitchYawRoll(FXfloat pitch,FXfloat yaw,FXfloat roll);
/// Return the pitch (y), yaw (z), roll (x) angles represented by the quaternion
void getPitchYawRoll(FXfloat& pitch,FXfloat& yaw,FXfloat& roll) const;
/// Set quaternion from yaw (z), roll (x), pitch (y), in that order
void setYawRollPitch(FXfloat yaw,FXfloat roll,FXfloat pitch);
/// Return the yaw (z), roll (x), pitch (y) angles represented by the quaternion
void getYawRollPitch(FXfloat& yaw,FXfloat& roll,FXfloat& pitch) const;
/// Set quaternion from axes
void setAxes(const FXVec3f& ex,const FXVec3f& ey,const FXVec3f& ez);
/// Get quaternion axes
void getAxes(FXVec3f& ex,FXVec3f& ey,FXVec3f& ez) const;
/// Obtain local x axis
FXVec3f getXAxis() const;
/// Obtain local y axis
FXVec3f getYAxis() const;
/// Obtain local z axis
FXVec3f getZAxis() const;
/// Exponentiate quaternion
FXQuatf exp() const;
/// Take logarithm of quaternion
FXQuatf log() const;
/// Power of quaternion
FXQuatf pow(FXfloat t) const;
/// Conjugate quaternion
FXQuatf conj() const { return FXQuatf(-x,-y,-z,w); }
/// Invert unit quaternion
FXQuatf unitinvert() const { return FXQuatf(-x,-y,-z,w); }
/// Invert quaternion
FXQuatf invert() const { FXfloat m(length2()); return FXQuatf(-x/m,-y/m,-z/m,w/m); }
/// Destructor
~FXQuatf(){}
};
/// Scaling
static inline FXQuatf operator*(const FXQuatf& a,FXfloat n){return FXQuatf(a.x*n,a.y*n,a.z*n,a.w*n);}
static inline FXQuatf operator*(FXfloat n,const FXQuatf& a){return FXQuatf(n*a.x,n*a.y,n*a.z,n*a.w);}
static inline FXQuatf operator/(const FXQuatf& a,FXfloat n){return FXQuatf(a.x/n,a.y/n,a.z/n,a.w/n);}
static inline FXQuatf operator/(FXfloat n,const FXQuatf& a){return FXQuatf(n/a.x,n/a.y,n/a.z,n/a.w);}
/// Quaternion and quaternion multiply
static inline FXQuatf operator*(const FXQuatf& a,const FXQuatf& b){ return FXQuatf(a.w*b.x+a.x*b.w+a.y*b.z-a.z*b.y, a.w*b.y+a.y*b.w+a.z*b.x-a.x*b.z, a.w*b.z+a.z*b.w+a.x*b.y-a.y*b.x, a.w*b.w-a.x*b.x-a.y*b.y-a.z*b.z); }
static inline FXQuatf operator/(const FXQuatf& a,const FXQuatf& b){ return a*b.invert(); }
/// Rotation unit-quaternion and vector q . v = (q* . v . q)
extern FXAPI FXVec3f operator*(const FXQuatf& q,const FXVec3f& v);
/// Rotation a vector and unit-quaternion v . q = (q . v . q*)
extern FXAPI FXVec3f operator*(const FXVec3f& v,const FXQuatf& q);
/// Quaternion and quaternion addition
static inline FXQuatf operator+(const FXQuatf& a,const FXQuatf& b){ return FXQuatf(a.x+b.x,a.y+b.y,a.z+b.z,a.w+b.w); }
static inline FXQuatf operator-(const FXQuatf& a,const FXQuatf& b){ return FXQuatf(a.x-b.x,a.y-b.y,a.z-b.z,a.w-b.w); }
/// Equality tests
static inline FXbool operator==(const FXQuatf& a,FXfloat n){return a.x==n && a.y==n && a.z==n && a.w==n;}
static inline FXbool operator!=(const FXQuatf& a,FXfloat n){return a.x!=n || a.y!=n || a.z!=n || a.w!=n;}
static inline FXbool operator==(FXfloat n,const FXQuatf& a){return n==a.x && n==a.y && n==a.z && n==a.w;}
static inline FXbool operator!=(FXfloat n,const FXQuatf& a){return n!=a.x || n!=a.y || n!=a.z || n!=a.w;}
/// Equality tests
static inline FXbool operator==(const FXQuatf& a,const FXQuatf& b){ return a.x==b.x && a.y==b.y && a.z==b.z && a.w==b.w; }
static inline FXbool operator!=(const FXQuatf& a,const FXQuatf& b){ return a.x!=b.x || a.y!=b.y || a.z!=b.z || a.w!=b.w; }
/// Normalize non-zero quaternion such that |Q|==1
static inline FXQuatf normalize(const FXQuatf& q){ return q*Math::rsqrt(q.length2()); }
/// Normalize quaternion incrementally; assume |Q| is approximately 1 already
static inline FXQuatf fastnormalize(const FXQuatf& q){ return q*((3.0f-q.length2())*0.5f); }
/// Construct quaternion from arc a->b on unit sphere
extern FXAPI FXQuatf arc(const FXVec3f& a,const FXVec3f& b);
/// Spherical lerp of unit quaternions u,v
extern FXAPI FXQuatf lerp(const FXQuatf& u,const FXQuatf& v,FXfloat f);
/// Derivative of spherical lerp of unit quaternions u,v
extern FXAPI FXQuatf lerpdot(const FXQuatf& u,const FXQuatf& v,FXfloat f);
/// Cubic hermite quaternion interpolation
extern FXAPI FXQuatf hermite(const FXQuatf& q0,const FXVec3f& r0,const FXQuatf& q1,const FXVec3f& r1,FXfloat t);
/// Estimate angular body rates omega from unit quaternions Q0 and Q1 separated by time dt
extern FXAPI FXVec3f omegaBody(const FXQuatf& q0,const FXQuatf& q1,FXfloat dt);
/// Derivative of unit quaternion q with body angular rates omega (rad/s)
extern FXAPI FXQuatf quatDot(const FXQuatf& q,const FXVec3f& omega);
/// Calculate angular acceleration of a body with inertial moments tensor M
/// Rotation about its axes with angular rates omega, under a torque torq
extern FXAPI FXVec3f omegaDot(const FXMat3f& M,const FXVec3f& omega,const FXVec3f& torq);
/// Save quaternion to a stream
extern FXAPI FXStream& operator<<(FXStream& store,const FXQuatf& v);
/// Load quaternion from a stream
extern FXAPI FXStream& operator>>(FXStream& store,FXQuatf& v);
}
#endif