Long live Qt!

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diff --git a/src/gui/math3d/qvector3d.cpp b/src/gui/math3d/qvector3d.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the $MODULE$ of the Qt Toolkit.
+**
+** $TROLLTECH_DUAL_LICENSE$
+**
+****************************************************************************/
+
+#include "qvector3d.h"
+#include "qvector2d.h"
+#include "qvector4d.h"
+#include "qmath3dutil_p.h"
+#include <QtCore/qmath.h>
+
+QT_BEGIN_NAMESPACE
+
+#ifndef QT_NO_VECTOR3D
+
+/*!
+    \class QVector3D
+    \brief The QVector3D class represents a vector or vertex in 3D space.
+    \since 4.6
+
+    Vectors are one of the main building blocks of 3D representation and
+    drawing.  They consist of three coordinates, traditionally called
+    x, y, and z.
+
+    The QVector3D class can also be used to represent vertices in 3D space.
+    We therefore do not need to provide a separate vertex class.
+
+    The coordinates are stored internally using the most efficient
+    representation for the GL rendering engine, which will be either
+    floating-point or fixed-point.
+*/
+
+/*!
+    \fn QVector3D::QVector3D()
+
+    Constructs a null vector, i.e. with coordinates (0, 0, 0).
+*/
+
+/*!
+    \fn QVector3D::QVector3D(qreal xpos, qreal ypos, qreal zpos)
+
+    Constructs a vector with coordinates (\a xpos, \a ypos, \a zpos).
+*/
+
+/*!
+    \fn QVector3D::QVector3D(int xpos, int ypos, int zpos)
+
+    Constructs a vector with coordinates (\a xpos, \a ypos, \a zpos).
+*/
+
+/*!
+    \fn QVector3D::QVector3D(const QPoint& point)
+
+    Constructs a vector with x and y coordinates from a 2D \a point, and a
+    z coordinate of 0.
+*/
+
+/*!
+    \fn QVector3D::QVector3D(const QPointF& point)
+
+    Constructs a vector with x and y coordinates from a 2D \a point, and a
+    z coordinate of 0.
+*/
+
+#ifndef QT_NO_VECTOR2D
+
+/*!
+    Constructs a 3D vector from the specified 2D \a vector.  The z
+    coordinate is set to zero.
+
+    \sa toVector2D()
+*/
+QVector3D::QVector3D(const QVector2D& vector)
+{
+    xp = vector.xp;
+    yp = vector.yp;
+    zp = 0.0f;
+}
+
+/*!
+    Constructs a 3D vector from the specified 2D \a vector.  The z
+    coordinate is set to \a zpos.
+
+    \sa toVector2D()
+*/
+QVector3D::QVector3D(const QVector2D& vector, qreal zpos)
+{
+    xp = vector.xp;
+    yp = vector.yp;
+    zp = zpos;
+}
+
+#endif
+
+#ifndef QT_NO_VECTOR4D
+
+/*!
+    Constructs a 3D vector from the specified 4D \a vector.  The w
+    coordinate is dropped.
+
+    \sa toVector4D()
+*/
+QVector3D::QVector3D(const QVector4D& vector)
+{
+    xp = vector.xp;
+    yp = vector.yp;
+    zp = vector.zp;
+}
+
+#endif
+
+/*!
+    \fn bool QVector3D::isNull() const
+
+    Returns true if the x, y, and z coordinates are set to 0.0,
+    otherwise returns false.
+*/
+
+/*!
+    \fn qreal QVector3D::x() const
+
+    Returns the x coordinate of this point.
+
+    \sa setX(), y(), z()
+*/
+
+/*!
+    \fn qreal QVector3D::y() const
+
+    Returns the y coordinate of this point.
+
+    \sa setY(), x(), z()
+*/
+
+/*!
+    \fn qreal QVector3D::z() const
+
+    Returns the z coordinate of this point.
+
+    \sa setZ(), x(), y()
+*/
+
+/*!
+    \fn void QVector3D::setX(qreal x)
+
+    Sets the x coordinate of this point to the given \a x coordinate.
+
+    \sa x(), setY(), setZ()
+*/
+
+/*!
+    \fn void QVector3D::setY(qreal y)
+
+    Sets the y coordinate of this point to the given \a y coordinate.
+
+    \sa y(), setX(), setZ()
+*/
+
+/*!
+    \fn void QVector3D::setZ(qreal z)
+
+    Sets the z coordinate of this point to the given \a z coordinate.
+
+    \sa z(), setX(), setY()
+*/
+
+/*!
+    Returns the normalized unit vector form of this vector.  If this vector
+    is not null, the returned vector is guaranteed to be 1.0 in length.
+    If this vector is null, then a null vector is returned.
+
+    \sa length(), normalize()
+*/
+QVector3D QVector3D::normalized() const
+{
+    qreal len = length();
+    if (!qIsNull(len))
+        return *this / len;
+    else
+        return QVector3D();
+}
+
+/*!
+    Normalizes the currect vector in place.  Nothing happens if this
+    vector is a null vector.
+
+    \sa length(), normalized()
+*/
+void QVector3D::normalize()
+{
+    qreal len = length();
+    if (qIsNull(len))
+        return;
+
+    xp /= len;
+    yp /= len;
+    zp /= len;
+}
+
+/*!
+    \fn QVector3D &QVector3D::operator+=(const QVector3D &vector)
+
+    Adds the given \a vector to this vector and returns a reference to
+    this vector.
+
+    \sa operator-=()
+*/
+
+/*!
+    \fn QVector3D &QVector3D::operator-=(const QVector3D &vector)
+
+    Subtracts the given \a vector from this vector and returns a reference to
+    this vector.
+
+    \sa operator+=()
+*/
+
+/*!
+    \fn QVector3D &QVector3D::operator*=(qreal factor)
+
+    Multiplies this vector's coordinates by the given \a factor, and
+    returns a reference to this vector.
+
+    \sa operator/=()
+*/
+
+/*!
+    \fn QVector3D &QVector3D::operator*=(const QVector3D& vector)
+    \overload
+
+    Multiplies the components of this vector by the corresponding
+    components in \a vector.
+
+    Note: this is not the same as the crossProduct() of this
+    vector and \a vector.
+
+    \sa crossProduct()
+*/
+
+/*!
+    \fn QVector3D &QVector3D::operator/=(qreal divisor)
+
+    Divides this vector's coordinates by the given \a divisor, and
+    returns a reference to this vector.
+
+    \sa operator*=()
+*/
+
+/*!
+    Returns the dot product of \a v1 and \a v2.
+*/
+qreal QVector3D::dotProduct(const QVector3D& v1, const QVector3D& v2)
+{
+    return qvtdot64(qvtmul64(v1.xp, v2.xp) + qvtmul64(v1.yp, v2.yp) + qvtmul64(v1.zp, v2.zp));
+}
+
+/*!
+    Returns the cross-product of vectors \a v1 and \a v2, which corresponds
+    to the normal vector of a plane defined by \a v1 and \a v2.
+
+    \sa normal()
+*/
+QVector3D QVector3D::crossProduct(const QVector3D& v1, const QVector3D& v2)
+{
+    return QVector3D(v1.yp * v2.zp - v1.zp * v2.yp,
+                    v1.zp * v2.xp - v1.xp * v2.zp,
+                    v1.xp * v2.yp - v1.yp * v2.xp, 1);
+}
+
+/*!
+    Returns the normal vector of a plane defined by vectors \a v1 and \a v2,
+    normalized to be a unit vector.
+
+    Use crossProduct() to compute the cross-product of \a v1 and \a v2 if you
+    do not need the result to be normalized to a unit vector.
+
+    \sa crossProduct(), distanceToPlane()
+*/
+QVector3D QVector3D::normal(const QVector3D& v1, const QVector3D& v2)
+{
+    return crossProduct(v1, v2).normalized();
+}
+
+/*!
+    \overload
+
+    Returns the normal vector of a plane defined by vectors
+    \a v2 - \a v1 and \a v3 - \a v1, normalized to be a unit vector.
+
+    Use crossProduct() to compute the cross-product of \a v2 - \a v1 and
+    \a v3 - \a v1 if you do not need the result to be normalized to a
+    unit vector.
+
+    \sa crossProduct(), distanceToPlane()
+*/
+QVector3D QVector3D::normal
+        (const QVector3D& v1, const QVector3D& v2, const QVector3D& v3)
+{
+    return crossProduct((v2 - v1), (v3 - v1)).normalized();
+}
+
+/*!
+    Returns the distance from this vertex to a plane defined by
+    the vertex \a plane and a \a normal unit vector.  The \a normal
+    parameter is assumed to have been normalized to a unit vector.
+
+    The return value will be negative if the vertex is below the plane,
+    or zero if it is on the plane.
+
+    \sa normal(), distanceToLine()
+*/
+qreal QVector3D::distanceToPlane
+        (const QVector3D& plane, const QVector3D& normal) const
+{
+    return dotProduct(*this - plane, normal);
+}
+
+/*!
+    \overload
+
+    Returns the distance from this vertex a plane defined by
+    the vertices \a plane1, \a plane2 and \a plane3.
+
+    The return value will be negative if the vertex is below the plane,
+    or zero if it is on the plane.
+
+    The two vectors that define the plane are \a plane2 - \a plane1
+    and \a plane3 - \a plane1.
+
+    \sa normal(), distanceToLine()
+*/
+qreal QVector3D::distanceToPlane
+    (const QVector3D& plane1, const QVector3D& plane2, const QVector3D& plane3) const
+{
+    QVector3D n = normal(plane2 - plane1, plane3 - plane1);
+    return dotProduct(*this - plane1, n);
+}
+
+/*!
+    Returns the distance that this vertex is from a line defined
+    by \a point and the unit vector \a direction.
+
+    If \a direction is a null vector, then it does not define a line.
+    In that case, the distance from \a point to this vertex is returned.
+
+    \sa distanceToPlane()
+*/
+qreal QVector3D::distanceToLine
+        (const QVector3D& point, const QVector3D& direction) const
+{
+    if (direction.isNull())
+        return (*this - point).length();
+    QVector3D p = point + dotProduct(*this - point, direction) * direction;
+    return (*this - p).length();
+}
+
+/*!
+    \fn bool operator==(const QVector3D &v1, const QVector3D &v2)
+    \relates QVector3D
+
+    Returns true if \a v1 is equal to \a v2; otherwise returns false.
+    This operator uses an exact floating-point comparison.
+*/
+
+/*!
+    \fn bool operator!=(const QVector3D &v1, const QVector3D &v2)
+    \relates QVector3D
+
+    Returns true if \a v1 is not equal to \a v2; otherwise returns false.
+    This operator uses an exact floating-point comparison.
+*/
+
+/*!
+    \fn const QVector3D operator+(const QVector3D &v1, const QVector3D &v2)
+    \relates QVector3D
+
+    Returns a QVector3D object that is the sum of the given vectors, \a v1
+    and \a v2; each component is added separately.
+
+    \sa QVector3D::operator+=()
+*/
+
+/*!
+    \fn const QVector3D operator-(const QVector3D &v1, const QVector3D &v2)
+    \relates QVector3D
+
+    Returns a QVector3D object that is formed by subtracting \a v2 from \a v1;
+    each component is subtracted separately.
+
+    \sa QVector3D::operator-=()
+*/
+
+/*!
+    \fn const QVector3D operator*(qreal factor, const QVector3D &vector)
+    \relates QVector3D
+
+    Returns a copy of the given \a vector,  multiplied by the given \a factor.
+
+    \sa QVector3D::operator*=()
+*/
+
+/*!
+    \fn const QVector3D operator*(const QVector3D &vector, qreal factor)
+    \relates QVector3D
+
+    Returns a copy of the given \a vector,  multiplied by the given \a factor.
+
+    \sa QVector3D::operator*=()
+*/
+
+/*!
+    \fn const QVector3D operator*(const QVector3D &v1, const QVector3D& v2)
+    \relates QVector3D
+
+    Multiplies the components of \a v1 by the corresponding components in \a v2.
+
+    Note: this is not the same as the crossProduct() of \a v1 and \a v2.
+
+    \sa QVector3D::crossProduct()
+*/
+
+/*!
+    \fn const QVector3D operator-(const QVector3D &vector)
+    \relates QVector3D
+    \overload
+
+    Returns a QVector3D object that is formed by changing the sign of
+    all three components of the given \a vector.
+
+    Equivalent to \c {QVector3D(0,0,0) - vector}.
+*/
+
+/*!
+    \fn const QVector3D operator/(const QVector3D &vector, qreal divisor)
+    \relates QVector3D
+
+    Returns the QVector3D object formed by dividing all three components of
+    the given \a vector by the given \a divisor.
+
+    \sa QVector3D::operator/=()
+*/
+
+/*!
+    \fn bool qFuzzyCompare(const QVector3D& v1, const QVector3D& v2)
+    \relates QVector3D
+
+    Returns true if \a v1 and \a v2 are equal, allowing for a small
+    fuzziness factor for floating-point comparisons; false otherwise.
+*/
+
+#ifndef QT_NO_VECTOR2D
+
+/*!
+    Returns the 2D vector form of this 3D vector, dropping the z coordinate.
+
+    \sa toVector4D(), toPoint()
+*/
+QVector2D QVector3D::toVector2D() const
+{
+    return QVector2D(xp, yp, 1);
+}
+
+#endif
+
+#ifndef QT_NO_VECTOR4D
+
+/*!
+    Returns the 4D form of this 3D vector, with the w coordinate set to zero.
+
+    \sa toVector2D(), toPoint()
+*/
+QVector4D QVector3D::toVector4D() const
+{
+    return QVector4D(xp, yp, zp, 0.0f, 1);
+}
+
+#endif
+
+/*!
+    \fn QPoint QVector3D::toPoint() const
+
+    Returns the QPoint form of this 3D vector.
+
+    \sa toPointF(), toVector2D()
+*/
+
+/*!
+    \fn QPointF QVector3D::toPointF() const
+
+    Returns the QPointF form of this 3D vector.
+
+    \sa toPoint(), toVector2D()
+*/
+
+/*!
+    Returns the length of the vector from the origin.
+
+    \sa lengthSquared(), normalized()
+*/
+qreal QVector3D::length() const
+{
+    return qvtsqrt64(qvtmul64(xp, xp) + qvtmul64(yp, yp) + qvtmul64(zp, zp));
+}
+
+/*!
+    Returns the squared length of the vector from the origin.
+    This is equivalent to the dot product of the vector with itself.
+
+    \sa length(), dotProduct()
+*/
+qreal QVector3D::lengthSquared() const
+{
+    return qvtdot64(qvtmul64(xp, xp) + qvtmul64(yp, yp) + qvtmul64(zp, zp));
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+
+QDebug operator<<(QDebug dbg, const QVector3D &vector)
+{
+    dbg.nospace() << "QVector3D("
+        << vector.x() << ", " << vector.y() << ", " << vector.z() << ')';
+    return dbg.space();
+}
+
+#endif
+
+#endif
+
+QT_END_NAMESPACE