common/include/QtGui/qtransform.h

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#ifndef QTRANSFORM_H
#define QTRANSFORM_H

#include <QtGui/qmatrix.h>
#include <QtGui/qpainterpath.h>
#include <QtGui/qpolygon.h>
#include <QtGui/qregion.h>
#include <QtGui/qwindowdefs.h>
#include <QtCore/qline.h>
#include <QtCore/qpoint.h>
#include <QtCore/qrect.h>

QT_BEGIN_NAMESPACE


class QVariant;

class Q_GUI_EXPORT QTransform
{
public:
    enum TransformationType {
        TxNone      = 0x00,
        TxTranslate = 0x01,
        TxScale     = 0x02,
        TxRotate    = 0x04,
        TxShear     = 0x08,
        TxProject   = 0x10
    };

    inline explicit QTransform(Qt::Initialization) : affine(Qt::Uninitialized) {}
    QTransform();
    QTransform(qreal h11, qreal h12, qreal h13,
               qreal h21, qreal h22, qreal h23,
               qreal h31, qreal h32, qreal h33 = 1.0);
    QTransform(qreal h11, qreal h12, qreal h21,
               qreal h22, qreal dx, qreal dy);
    explicit QTransform(const QMatrix &mtx);

    bool isAffine() const;
    bool isIdentity() const;
    bool isInvertible() const;
    bool isScaling() const;
    bool isRotating() const;
    bool isTranslating() const;

    TransformationType type() const;

    inline qreal determinant() const;
    qreal det() const;

    qreal m11() const;
    qreal m12() const;
    qreal m13() const;
    qreal m21() const;
    qreal m22() const;
    qreal m23() const;
    qreal m31() const;
    qreal m32() const;
    qreal m33() const;
    qreal dx() const;
    qreal dy() const;

    void setMatrix(qreal m11, qreal m12, qreal m13,
                   qreal m21, qreal m22, qreal m23,
                   qreal m31, qreal m32, qreal m33);

    QTransform inverted(bool *invertible = 0) const Q_REQUIRED_RESULT;
    QTransform adjoint() const Q_REQUIRED_RESULT;
    QTransform transposed() const Q_REQUIRED_RESULT;

    QTransform &translate(qreal dx, qreal dy);
    QTransform &scale(qreal sx, qreal sy);
    QTransform &shear(qreal sh, qreal sv);
    QTransform &rotate(qreal a, Qt::Axis axis = Qt::ZAxis);
    QTransform &rotateRadians(qreal a, Qt::Axis axis = Qt::ZAxis);

    static bool squareToQuad(const QPolygonF &square, QTransform &result);
    static bool quadToSquare(const QPolygonF &quad, QTransform &result);
    static bool quadToQuad(const QPolygonF &one,
                           const QPolygonF &two,
                           QTransform &result);

    bool operator==(const QTransform &) const;
    bool operator!=(const QTransform &) const;

    QTransform &operator*=(const QTransform &);
    QTransform operator*(const QTransform &o) const;

    QTransform &operator=(const QTransform &);

    operator QVariant() const;

    void reset();
    QPoint       map(const QPoint &p) const;
    QPointF      map(const QPointF &p) const;
    QLine        map(const QLine &l) const;
    QLineF       map(const QLineF &l) const;
    QPolygonF    map(const QPolygonF &a) const;
    QPolygon     map(const QPolygon &a) const;
    QRegion      map(const QRegion &r) const;
    QPainterPath map(const QPainterPath &p) const;
    QPolygon     mapToPolygon(const QRect &r) const;
    QRect mapRect(const QRect &) const;
    QRectF mapRect(const QRectF &) const;
    void map(int x, int y, int *tx, int *ty) const;
    void map(qreal x, qreal y, qreal *tx, qreal *ty) const;

    const QMatrix &toAffine() const;

    QTransform &operator*=(qreal div);
    QTransform &operator/=(qreal div);
    QTransform &operator+=(qreal div);
    QTransform &operator-=(qreal div);

    static QTransform fromTranslate(qreal dx, qreal dy);
    static QTransform fromScale(qreal dx, qreal dy);

private:
    inline QTransform(qreal h11, qreal h12, qreal h13,
                      qreal h21, qreal h22, qreal h23,
                      qreal h31, qreal h32, qreal h33, bool)
        : affine(h11, h12, h21, h22, h31, h32, true)
        , m_13(h13), m_23(h23), m_33(h33)
        , m_type(TxNone)
        , m_dirty(TxProject)
        , d(Q_NULLPTR)
    {
    }
    inline QTransform(bool)
        : affine(true)
        , m_13(0), m_23(0), m_33(1)
        , m_type(TxNone)
        , m_dirty(TxNone)
        , d(Q_NULLPTR)
    {
    }
    inline TransformationType inline_type() const;
    QMatrix affine;
    qreal   m_13;
    qreal   m_23;
    qreal   m_33;

    mutable uint m_type : 5;
    mutable uint m_dirty : 5;

    class Private;
    Private *d;
};
Q_DECLARE_TYPEINFO(QTransform, Q_MOVABLE_TYPE);

/******* inlines *****/
inline QTransform::TransformationType QTransform::inline_type() const
{
    if (m_dirty == TxNone)
        return static_cast<TransformationType>(m_type);
    return type();
}

inline bool QTransform::isAffine() const
{
    return inline_type() < TxProject;
}
inline bool QTransform::isIdentity() const
{
    return inline_type() == TxNone;
}

inline bool QTransform::isInvertible() const
{
    return !qFuzzyIsNull(determinant());
}

inline bool QTransform::isScaling() const
{
    return type() >= TxScale;
}
inline bool QTransform::isRotating() const
{
    return inline_type() >= TxRotate;
}

inline bool QTransform::isTranslating() const
{
    return inline_type() >= TxTranslate;
}

inline qreal QTransform::determinant() const
{
    return affine._m11*(m_33*affine._m22-affine._dy*m_23) -
        affine._m21*(m_33*affine._m12-affine._dy*m_13)+affine._dx*(m_23*affine._m12-affine._m22*m_13);
}
inline qreal QTransform::det() const
{
    return determinant();
}
inline qreal QTransform::m11() const
{
    return affine._m11;
}
inline qreal QTransform::m12() const
{
    return affine._m12;
}
inline qreal QTransform::m13() const
{
    return m_13;
}
inline qreal QTransform::m21() const
{
    return affine._m21;
}
inline qreal QTransform::m22() const
{
    return affine._m22;
}
inline qreal QTransform::m23() const
{
    return m_23;
}
inline qreal QTransform::m31() const
{
    return affine._dx;
}
inline qreal QTransform::m32() const
{
    return affine._dy;
}
inline qreal QTransform::m33() const
{
    return m_33;
}
inline qreal QTransform::dx() const
{
    return affine._dx;
}
inline qreal QTransform::dy() const
{
    return affine._dy;
}

inline QTransform &QTransform::operator*=(qreal num)
{
    if (num == 1.)
        return *this;
    affine._m11 *= num;
    affine._m12 *= num;
    m_13        *= num;
    affine._m21 *= num;
    affine._m22 *= num;
    m_23        *= num;
    affine._dx  *= num;
    affine._dy  *= num;
    m_33        *= num;
    if (m_dirty < TxScale)
        m_dirty = TxScale;
    return *this;
}
inline QTransform &QTransform::operator/=(qreal div)
{
    if (div == 0)
        return *this;
    div = 1/div;
    return operator*=(div);
}
inline QTransform &QTransform::operator+=(qreal num)
{
    if (num == 0)
        return *this;
    affine._m11 += num;
    affine._m12 += num;
    m_13        += num;
    affine._m21 += num;
    affine._m22 += num;
    m_23        += num;
    affine._dx  += num;
    affine._dy  += num;
    m_33        += num;
    m_dirty     = TxProject;
    return *this;
}
inline QTransform &QTransform::operator-=(qreal num)
{
    if (num == 0)
        return *this;
    affine._m11 -= num;
    affine._m12 -= num;
    m_13        -= num;
    affine._m21 -= num;
    affine._m22 -= num;
    m_23        -= num;
    affine._dx  -= num;
    affine._dy  -= num;
    m_33        -= num;
    m_dirty     = TxProject;
    return *this;
}

inline bool qFuzzyCompare(const QTransform& t1, const QTransform& t2)
{
    return qFuzzyCompare(t1.m11(), t2.m11())
        && qFuzzyCompare(t1.m12(), t2.m12())
        && qFuzzyCompare(t1.m13(), t2.m13())
        && qFuzzyCompare(t1.m21(), t2.m21())
        && qFuzzyCompare(t1.m22(), t2.m22())
        && qFuzzyCompare(t1.m23(), t2.m23())
        && qFuzzyCompare(t1.m31(), t2.m31())
        && qFuzzyCompare(t1.m32(), t2.m32())
        && qFuzzyCompare(t1.m33(), t2.m33());
}


/****** stream functions *******************/
#ifndef QT_NO_DATASTREAM
Q_GUI_EXPORT QDataStream &operator<<(QDataStream &, const QTransform &);
Q_GUI_EXPORT QDataStream &operator>>(QDataStream &, QTransform &);
#endif

#ifndef QT_NO_DEBUG_STREAM
Q_GUI_EXPORT QDebug operator<<(QDebug, const QTransform &);
#endif
/****** end stream functions *******************/

// mathematical semantics
inline QPoint operator*(const QPoint &p, const QTransform &m)
{ return m.map(p); }
inline QPointF operator*(const QPointF &p, const QTransform &m)
{ return m.map(p); }
inline QLineF operator*(const QLineF &l, const QTransform &m)
{ return m.map(l); }
inline QLine operator*(const QLine &l, const QTransform &m)
{ return m.map(l); }
inline QPolygon operator *(const QPolygon &a, const QTransform &m)
{ return m.map(a); }
inline QPolygonF operator *(const QPolygonF &a, const QTransform &m)
{ return m.map(a); }
inline QRegion operator *(const QRegion &r, const QTransform &m)
{ return m.map(r); }
inline QPainterPath operator *(const QPainterPath &p, const QTransform &m)
{ return m.map(p); }

inline QTransform operator *(const QTransform &a, qreal n)
{ QTransform t(a); t *= n; return t; }
inline QTransform operator /(const QTransform &a, qreal n)
{ QTransform t(a); t /= n; return t; }
inline QTransform operator +(const QTransform &a, qreal n)
{ QTransform t(a); t += n; return t; }
inline QTransform operator -(const QTransform &a, qreal n)
{ QTransform t(a); t -= n; return t; }

QT_END_NAMESPACE

#endif // QTRANSFORM_H