qvector4d.cpp

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#include "qvector4d.h"
#include "qvector3d.h"
#include "qvector2d.h"
#include <QtCore/qdebug.h>
#include <QtCore/qvariant.h>
#include <QtCore/qmath.h>

QT_BEGIN_NAMESPACE

#ifndef QT_NO_VECTOR4D

#ifndef QT_NO_VECTOR2D

QVector4D::QVector4D(const QVector2D& vector)
{
    xp = vector.xp;
    yp = vector.yp;
    zp = 0.0f;
    wp = 0.0f;
}

QVector4D::QVector4D(const QVector2D& vector, qreal zpos, qreal wpos)
{
    xp = vector.xp;
    yp = vector.yp;
    zp = zpos;
    wp = wpos;
}

#endif

#ifndef QT_NO_VECTOR3D

QVector4D::QVector4D(const QVector3D& vector)
{
    xp = vector.xp;
    yp = vector.yp;
    zp = vector.zp;
    wp = 0.0f;
}

QVector4D::QVector4D(const QVector3D& vector, qreal wpos)
{
    xp = vector.xp;
    yp = vector.yp;
    zp = vector.zp;
    wp = wpos;
}

#endif

qreal QVector4D::length() const
{
    return qSqrt(xp * xp + yp * yp + zp * zp + wp * wp);
}

qreal QVector4D::lengthSquared() const
{
    return xp * xp + yp * yp + zp * zp + wp * wp;
}

QVector4D QVector4D::normalized() const
{
    // Need some extra precision if the length is very small.
    double len = double(xp) * double(xp) +
                 double(yp) * double(yp) +
                 double(zp) * double(zp) +
                 double(wp) * double(wp);
    if (qFuzzyIsNull(len - 1.0f))
        return *this;
    else if (!qFuzzyIsNull(len))
        return *this / qSqrt(len);
    else
        return QVector4D();
}

void QVector4D::normalize()
{
    // Need some extra precision if the length is very small.
    double len = double(xp) * double(xp) +
                 double(yp) * double(yp) +
                 double(zp) * double(zp) +
                 double(wp) * double(wp);
    if (qFuzzyIsNull(len - 1.0f) || qFuzzyIsNull(len))
        return;

    len = qSqrt(len);

    xp /= len;
    yp /= len;
    zp /= len;
    wp /= len;
}

qreal QVector4D::dotProduct(const QVector4D& v1, const QVector4D& v2)
{
    return v1.xp * v2.xp + v1.yp * v2.yp + v1.zp * v2.zp + v1.wp * v2.wp;
}

#ifndef QT_NO_VECTOR2D

QVector2D QVector4D::toVector2D() const
{
    return QVector2D(xp, yp, 1);
}

QVector2D QVector4D::toVector2DAffine() const
{
    if (qIsNull(wp))
        return QVector2D();
    return QVector2D(xp / wp, yp / wp, 1);
}

#endif

#ifndef QT_NO_VECTOR3D

QVector3D QVector4D::toVector3D() const
{
    return QVector3D(xp, yp, zp, 1);
}

QVector3D QVector4D::toVector3DAffine() const
{
    if (qIsNull(wp))
        return QVector3D();
    return QVector3D(xp / wp, yp / wp, zp / wp, 1);
}

#endif

QVector4D::operator QVariant() const
{
    return QVariant(QVariant::Vector4D, this);
}

#ifndef QT_NO_DEBUG_STREAM

QDebug operator<<(QDebug dbg, const QVector4D &vector)
{
    dbg.nospace() << "QVector4D("
        << vector.x() << ", " << vector.y() << ", "
        << vector.z() << ", " << vector.w() << ')';
    return dbg.space();
}

#endif

#ifndef QT_NO_DATASTREAM

QDataStream &operator<<(QDataStream &stream, const QVector4D &vector)
{
    stream << double(vector.x()) << double(vector.y())
           << double(vector.z()) << double(vector.w());
    return stream;
}

QDataStream &operator>>(QDataStream &stream, QVector4D &vector)
{
    double x, y, z, w;
    stream >> x;
    stream >> y;
    stream >> z;
    stream >> w;
    vector.setX(qreal(x));
    vector.setY(qreal(y));
    vector.setZ(qreal(z));
    vector.setW(qreal(w));
    return stream;
}

#endif // QT_NO_DATASTREAM

#endif // QT_NO_VECTOR4D

QT_END_NAMESPACE