qvector2d.cpp

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

QT_BEGIN_NAMESPACE

#ifndef QT_NO_VECTOR2D

#ifndef QT_NO_VECTOR3D

QVector2D::QVector2D(const QVector3D& vector)
{
    xp = vector.xp;
    yp = vector.yp;
}

#endif

#ifndef QT_NO_VECTOR4D

QVector2D::QVector2D(const QVector4D& vector)
{
    xp = vector.xp;
    yp = vector.yp;
}

#endif

qreal QVector2D::length() const
{
    return qSqrt(xp * xp + yp * yp);
}

qreal QVector2D::lengthSquared() const
{
    return xp * xp + yp * yp;
}

QVector2D QVector2D::normalized() const
{
    // Need some extra precision if the length is very small.
    double len = double(xp) * double(xp) +
                 double(yp) * double(yp);
    if (qFuzzyIsNull(len - 1.0f))
        return *this;
    else if (!qFuzzyIsNull(len))
        return *this / qSqrt(len);
    else
        return QVector2D();
}

void QVector2D::normalize()
{
    // Need some extra precision if the length is very small.
    double len = double(xp) * double(xp) +
                 double(yp) * double(yp);
    if (qFuzzyIsNull(len - 1.0f) || qFuzzyIsNull(len))
        return;

    len = qSqrt(len);

    xp /= len;
    yp /= len;
}

qreal QVector2D::dotProduct(const QVector2D& v1, const QVector2D& v2)
{
    return v1.xp * v2.xp + v1.yp * v2.yp;
}

#ifndef QT_NO_VECTOR3D

QVector3D QVector2D::toVector3D() const
{
    return QVector3D(xp, yp, 0.0f, 1);
}

#endif

#ifndef QT_NO_VECTOR4D

QVector4D QVector2D::toVector4D() const
{
    return QVector4D(xp, yp, 0.0f, 0.0f, 1);
}

#endif

QVector2D::operator QVariant() const
{
    return QVariant(QVariant::Vector2D, this);
}

#ifndef QT_NO_DEBUG_STREAM

QDebug operator<<(QDebug dbg, const QVector2D &vector)
{
    dbg.nospace() << "QVector2D(" << vector.x() << ", " << vector.y() << ')';
    return dbg.space();
}

#endif

#ifndef QT_NO_DATASTREAM

QDataStream &operator<<(QDataStream &stream, const QVector2D &vector)
{
    stream << double(vector.x()) << double(vector.y());
    return stream;
}

QDataStream &operator>>(QDataStream &stream, QVector2D &vector)
{
    double x, y;
    stream >> x;
    stream >> y;
    vector.setX(qreal(x));
    vector.setY(qreal(y));
    return stream;
}

#endif // QT_NO_DATASTREAM

#endif // QT_NO_VECTOR2D

QT_END_NAMESPACE