/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Copyright (C) 2016 Ivailo Monev
**
** This file is part of the QtGui module of the Katie Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
**
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QTRANSFORM_H
#define QTRANSFORM_H

#include <QtGui/qpainterpath.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
    };

    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);

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

    inline TransformationType type() const;

    inline qreal determinant() 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;
    QTransform adjoint() const;
    QTransform transposed() const;

    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:
    void transformDirty(const QTransform::TransformationType type);

    QMatrix affine;
    qreal   m_13;
    qreal   m_23;
    qreal   m_33;

    TransformationType m_type;
};
Q_DECLARE_TYPEINFO(QTransform, Q_MOVABLE_TYPE);

/******* inlines *****/
inline QTransform::TransformationType QTransform::type() const
{
    return m_type;
}

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

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

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

inline bool QTransform::isTranslating() const
{
    return m_type >= QTransform::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::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 div)
{
    if (div == 0)
        return *this;
    return operator*=(1/div);
}

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

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

QT_END_NAMESPACE

#endif
