Viadeo Twitter Google Bookmarks ! Facebook Digg del.icio.us MySpace Yahoo MyWeb Blinklist Netvouz Reddit Simpy StumbleUpon Bookmarks Windows Live Favorites 
Logo Documentation Qt ·  Page d'accueil  ·  Toutes les classes  ·  Toutes les fonctions  ·  Vues d'ensemble  · 

QQuaternion Class Reference
[QtGui module]

The QQuaternion class represents a quaternion consisting of a vector and scalar. More...

 #include <QQuaternion>

This class was introduced in Qt 4.6.


Public Functions

QQuaternion ()
QQuaternion ( qreal scalar, qreal xpos, qreal ypos, qreal zpos )
QQuaternion ( qreal scalar, const QVector3D & vector )
QQuaternion ( const QVector4D & vector )
QQuaternion conjugate () const
bool isIdentity () const
bool isNull () const
qreal length () const
qreal lengthSquared () const
void normalize ()
QQuaternion normalized () const
QVector3D rotatedVector ( const QVector3D & vector ) const
qreal scalar () const
void setScalar ( qreal scalar )
void setVector ( const QVector3D & vector )
void setVector ( qreal x, qreal y, qreal z )
void setX ( qreal x )
void setY ( qreal y )
void setZ ( qreal z )
QVector4D toVector4D () const
QVector3D vector () const
qreal x () const
qreal y () const
qreal z () const
operator QVariant () const
QQuaternion & operator*= ( qreal factor )
QQuaternion & operator*= ( const QQuaternion & quaternion )
QQuaternion & operator+= ( const QQuaternion & quaternion )
QQuaternion & operator-= ( const QQuaternion & quaternion )
QQuaternion & operator/= ( qreal divisor )

Static Public Members

QQuaternion fromAxisAndAngle ( const QVector3D & axis, qreal angle )
QQuaternion fromAxisAndAngle ( qreal x, qreal y, qreal z, qreal angle )
QQuaternion nlerp ( const QQuaternion & q1, const QQuaternion & q2, qreal t )
QQuaternion slerp ( const QQuaternion & q1, const QQuaternion & q2, qreal t )

Related Non-Members

bool qFuzzyCompare ( const QQuaternion & q1, const QQuaternion & q2 )
bool operator!= ( const QQuaternion & q1, const QQuaternion & q2 )
const QQuaternion operator* ( const QQuaternion & q1, const QQuaternion & q2 )
const QQuaternion operator* ( qreal factor, const QQuaternion & quaternion )
const QQuaternion operator* ( const QQuaternion & quaternion, qreal factor )
const QQuaternion operator+ ( const QQuaternion & q1, const QQuaternion & q2 )
const QQuaternion operator- ( const QQuaternion & q1, const QQuaternion & q2 )
const QQuaternion operator- ( const QQuaternion & quaternion )
const QQuaternion operator/ ( const QQuaternion & quaternion, qreal divisor )
QDataStream & operator<< ( QDataStream & stream, const QQuaternion & quaternion )
bool operator== ( const QQuaternion & q1, const QQuaternion & q2 )
QDataStream & operator>> ( QDataStream & stream, QQuaternion & quaternion )

Detailed Description

The QQuaternion class represents a quaternion consisting of a vector and scalar.

Quaternions are used to represent rotations in 3D space, and consist of a 3D rotation axis specified by the x, y, and z coordinates, and a scalar representing the rotation angle.


Member Function Documentation

QQuaternion::QQuaternion ()

Constructs an identity quaternion, i.e. with coordinates (1, 0, 0, 0).

QQuaternion::QQuaternion ( qreal scalar, qreal xpos, qreal ypos, qreal zpos )

Constructs a quaternion with the vector (xpos, ypos, zpos) and scalar.

QQuaternion::QQuaternion ( qreal scalar, const QVector3D & vector )

Constructs a quaternion vector from the specified vector and scalar.

See also vector() and scalar().

QQuaternion::QQuaternion ( const QVector4D & vector )

Constructs a quaternion from the components of vector.

QQuaternion QQuaternion::conjugate () const

Returns the conjugate of this quaternion, which is (-x, -y, -z, scalar).

QQuaternion QQuaternion::fromAxisAndAngle ( const QVector3D & axis, qreal angle )   [static]

Creates a normalized quaternion that corresponds to rotating through angle degrees about the specified 3D axis.

QQuaternion QQuaternion::fromAxisAndAngle ( qreal x, qreal y, qreal z, qreal angle )   [static]

Creates a normalized quaternion that corresponds to rotating through angle degrees about the 3D axis (x, y, z).

bool QQuaternion::isIdentity () const

Returns true if the x, y, and z components of this quaternion are set to 0.0, and the scalar component is set to 1.0; otherwise returns false.

bool QQuaternion::isNull () const

Returns true if the x, y, z, and scalar components of this quaternion are set to 0.0; otherwise returns false.

qreal QQuaternion::length () const

Returns the length of the quaternion. This is also called the "norm".

See also lengthSquared() and normalized().

qreal QQuaternion::lengthSquared () const

Returns the squared length of the quaternion.

See also length().

QQuaternion QQuaternion::nlerp ( const QQuaternion & q1, const QQuaternion & q2, qreal t )   [static]

Interpolates along the shortest linear path between the rotational positions q1 and q2. The value t should be between 0 and 1, indicating the distance to travel between q1 and q2. The result will be normalized().

If t is less than or equal to 0, then q1 will be returned. If t is greater than or equal to 1, then q2 will be returned.

The nlerp() function is typically faster than slerp() and will give approximate results to spherical interpolation that are good enough for some applications.

See also slerp().

void QQuaternion::normalize ()

Normalizes the currect quaternion in place. Nothing happens if this is a null quaternion or the length of the quaternion is very close to 1.

See also length() and normalized().

QQuaternion QQuaternion::normalized () const

Returns the normalized unit form of this quaternion.

If this quaternion is null, then a null quaternion is returned. If the length of the quaternion is very close to 1, then the quaternion will be returned as-is. Otherwise the normalized form of the quaternion of length 1 will be returned.

See also length() and normalize().

QVector3D QQuaternion::rotatedVector ( const QVector3D & vector ) const

Rotates vector with this quaternion to produce a new vector in 3D space. The following code:

 QVector3D result = q.rotatedVector(vector);

is equivalent to the following:

 QVector3D result = (q * QQuaternion(0, vector) * q.conjugate()).vector();

qreal QQuaternion::scalar () const

Returns the scalar component of this quaternion.

See also setScalar(), x(), y(), and z().

void QQuaternion::setScalar ( qreal scalar )

Sets the scalar component of this quaternion to scalar.

See also scalar(), setX(), setY(), and setZ().

void QQuaternion::setVector ( const QVector3D & vector )

Sets the vector component of this quaternion to vector.

See also vector() and setScalar().

void QQuaternion::setVector ( qreal x, qreal y, qreal z )

Sets the vector component of this quaternion to (x, y, z).

See also vector() and setScalar().

void QQuaternion::setX ( qreal x )

Sets the x coordinate of this quaternion's vector to the given x coordinate.

See also x(), setY(), setZ(), and setScalar().

void QQuaternion::setY ( qreal y )

Sets the y coordinate of this quaternion's vector to the given y coordinate.

See also y(), setX(), setZ(), and setScalar().

void QQuaternion::setZ ( qreal z )

Sets the z coordinate of this quaternion's vector to the given z coordinate.

See also z(), setX(), setY(), and setScalar().

QQuaternion QQuaternion::slerp ( const QQuaternion & q1, const QQuaternion & q2, qreal t )   [static]

Interpolates along the shortest spherical path between the rotational positions q1 and q2. The value t should be between 0 and 1, indicating the spherical distance to travel between q1 and q2.

If t is less than or equal to 0, then q1 will be returned. If t is greater than or equal to 1, then q2 will be returned.

See also nlerp().

QVector4D QQuaternion::toVector4D () const

Returns this quaternion as a 4D vector.

QVector3D QQuaternion::vector () const

Returns the vector component of this quaternion.

See also setVector() and scalar().

qreal QQuaternion::x () const

Returns the x coordinate of this quaternion's vector.

See also setX(), y(), z(), and scalar().

qreal QQuaternion::y () const

Returns the y coordinate of this quaternion's vector.

See also setY(), x(), z(), and scalar().

qreal QQuaternion::z () const

Returns the z coordinate of this quaternion's vector.

See also setZ(), x(), y(), and scalar().

QQuaternion::operator QVariant () const

Returns the quaternion as a QVariant.

QQuaternion & QQuaternion::operator*= ( qreal factor )

Multiplies this quaternion's components by the given factor, and returns a reference to this quaternion.

See also operator/=().

QQuaternion & QQuaternion::operator*= ( const QQuaternion & quaternion )

Multiplies this quaternion by quaternion and returns a reference to this quaternion.

QQuaternion & QQuaternion::operator+= ( const QQuaternion & quaternion )

Adds the given quaternion to this quaternion and returns a reference to this quaternion.

See also operator-=().

QQuaternion & QQuaternion::operator-= ( const QQuaternion & quaternion )

Subtracts the given quaternion from this quaternion and returns a reference to this quaternion.

See also operator+=().

QQuaternion & QQuaternion::operator/= ( qreal divisor )

Divides this quaternion's components by the given divisor, and returns a reference to this quaternion.

See also operator*=().


Related Non-Members

bool qFuzzyCompare ( const QQuaternion & q1, const QQuaternion & q2 )

Returns true if q1 and q2 are equal, allowing for a small fuzziness factor for floating-point comparisons; false otherwise.

bool operator!= ( const QQuaternion & q1, const QQuaternion & q2 )

Returns true if q1 is not equal to q2; otherwise returns false. This operator uses an exact floating-point comparison.

const QQuaternion operator* ( const QQuaternion & q1, const QQuaternion & q2 )

Multiplies q1 and q2 using quaternion multiplication. The result corresponds to applying both of the rotations specified by q1 and q2.

See also QQuaternion::operator*=().

const QQuaternion operator* ( qreal factor, const QQuaternion & quaternion )

Returns a copy of the given quaternion, multiplied by the given factor.

See also QQuaternion::operator*=().

const QQuaternion operator* ( const QQuaternion & quaternion, qreal factor )

Returns a copy of the given quaternion, multiplied by the given factor.

See also QQuaternion::operator*=().

const QQuaternion operator+ ( const QQuaternion & q1, const QQuaternion & q2 )

Returns a QQuaternion object that is the sum of the given quaternions, q1 and q2; each component is added separately.

See also QQuaternion::operator+=().

const QQuaternion operator- ( const QQuaternion & q1, const QQuaternion & q2 )

Returns a QQuaternion object that is formed by subtracting q2 from q1; each component is subtracted separately.

See also QQuaternion::operator-=().

const QQuaternion operator- ( const QQuaternion & quaternion )

This is an overloaded function.

Returns a QQuaternion object that is formed by changing the sign of all three components of the given quaternion.

Equivalent to QQuaternion(0,0,0,0) - quaternion.

const QQuaternion operator/ ( const QQuaternion & quaternion, qreal divisor )

Returns the QQuaternion object formed by dividing all components of the given quaternion by the given divisor.

See also QQuaternion::operator/=().

QDataStream & operator<< ( QDataStream & stream, const QQuaternion & quaternion )

Writes the given quaternion to the given stream and returns a reference to the stream.

See also Format of the QDataStream Operators.

bool operator== ( const QQuaternion & q1, const QQuaternion & q2 )

Returns true if q1 is equal to q2; otherwise returns false. This operator uses an exact floating-point comparison.

QDataStream & operator>> ( QDataStream & stream, QQuaternion & quaternion )

Reads a quaternion from the given stream into the given quaternion and returns a reference to the stream.

See also Format of the QDataStream Operators.

Publicité

Best Of

Actualités les plus lues

Semaine
Mois
Année
  1. « Quelque chose ne va vraiment pas avec les développeurs "modernes" », un développeur à "l'ancienne" critique la multiplication des bibliothèques 103
  2. Pourquoi les programmeurs sont-ils moins payés que les gestionnaires de programmes ? Manquent-ils de pouvoir de négociation ? 56
  3. «Le projet de loi des droits du développeur» : quelles conditions doivent remplir les entreprises pour que le développeur puisse réussir ? 90
  4. Les développeurs détestent-ils les antivirus ? Un programmeur manifeste sa haine envers ces solutions de sécurité 31
  5. Qt Commercial : Digia organise un webinar gratuit le 27 mars sur la conception d'interfaces utilisateur et d'applications avec le framework 0
  6. Quelles nouveautés de C++11 Visual C++ doit-il rapidement intégrer ? Donnez-nous votre avis 10
  7. 2017 : un quinquennat pour une nouvelle version du C++ ? Possible, selon Herb Sutter 11
Page suivante
  1. Linus Torvalds : le "C++ est un langage horrible", en justifiant le choix du C pour le système de gestion de version Git 100
  2. Comment prendre en compte l'utilisateur dans vos applications ? Pour un développeur, « 90 % des utilisateurs sont des idiots » 231
  3. Quel est LE livre que tout développeur doit lire absolument ? Celui qui vous a le plus marqué et inspiré 96
  4. Apple cède et s'engage à payer des droits à Nokia, le conflit des brevets entre les deux firmes s'achève 158
  5. Nokia porte à nouveau plainte contre Apple pour violation de sept nouveaux brevets 158
  6. « Quelque chose ne va vraiment pas avec les développeurs "modernes" », un développeur à "l'ancienne" critique la multiplication des bibliothèques 103
  7. Quel est le code dont vous êtes le plus fier ? Pourquoi l'avez-vous écrit ? Et pourquoi vous a-t-il donné autant de satisfaction ? 83
Page suivante

Le Qt Developer Network au hasard

Logo

Comment fermer une application

Le Qt Developer Network est un réseau de développeurs Qt anglophone, où ils peuvent partager leur expérience sur le framework. Lire l'article.

Communauté

Ressources

Liens utiles

Contact

  • Vous souhaitez rejoindre la rédaction ou proposer un tutoriel, une traduction, une question... ? Postez dans le forum Contribuez ou contactez-nous par MP ou par email (voir en bas de page).

Qt dans le magazine

Cette page est une traduction d'une page de la documentation de Qt, écrite par Nokia Corporation and/or its subsidiary(-ies). Les éventuels problèmes résultant d'une mauvaise traduction ne sont pas imputables à Nokia. Qt 4.6-snapshot
Copyright © 2012 Developpez LLC. Tous droits réservés Developpez LLC. Aucune reproduction, même partielle, ne peut être faite de ce site et de l'ensemble de son contenu : textes, documents et images sans l'autorisation expresse de Developpez LLC. Sinon, vous encourez selon la loi jusqu'à 3 ans de prison et jusqu'à 300 000 E de dommages et intérêts. Cette page est déposée à la SACD.
Vous avez déniché une erreur ? Un bug ? Une redirection cassée ? Ou tout autre problème, quel qu'il soit ? Ou bien vous désirez participer à ce projet de traduction ? N'hésitez pas à nous contacter ou par MP !
 
 
 
 
Partenaires

Hébergement Web