/*

* This file is part of the GreasePad distribution (https://github.com/FraunhoferIOSB/GreasePad).

* Copyright (c) 2022 Jochen Meidow, Fraunhofer IOSB

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <https://www.gnu.org/licenses/>.

*/

#ifndef QCONSTRAINTS_H

#define QCONSTRAINTS_H

#include <QDebug>

#include <QGraphicsItem>

#include <QPen>

#include <memory>

namespace Uncertain {

class uStraightLineSegment;

}

//! Graphics: Constraints

namespace QConstraint {

using Uncertain::uStraightLineSegment;

//! Graphics: Base class for markers depicting constraints

class QConstraintBase : public QGraphicsItem

{

protected:

QConstraintBase();

//! Copy constructor

QConstraintBase( const QConstraintBase & other);

//! Copy assignment operator

QConstraintBase & operator= ( const QConstraintBase &) = delete ;

//! Move assignment operator

QConstraintBase & operator= ( QConstraintBase &&) = delete;

public:

// virtual std::shared_ptr<QConstraintBase> clone() const = 0; //!< Clone this constraint

//! Clone this constraint via nonvirtual interface pattern

std::shared_ptr<QConstraintBase> clone() const;

// T qgraphicsitem_cast(QGraphicsItem *item)

// To make this function work correctly with custom items, reimplement the type() function for each custom QGraphicsItem subclass.

enum {Type = UserType +364};

//! Get graphics type (id)

int type() const override { return Type; }

void serialize( QDataStream &out ); //!< serialization

bool deserialize( QDataStream &); //!< deserialization

void setColor( const QColor & col); //!< Set color

void setLineWidth( const int w); //!< Set line width

void setLineStyle( const int s); //!< Set line style

void setAltColor( const QColor &col ); //!< Set color for automatic colorization

void setStatus( bool isrequired,

bool isenforced); //!< Set status

//! Get status enforcment (success/failure)

bool enforced() const { return m_is_enforced; }

virtual void setMarkerSize ( qreal s) = 0; //!< Set marker size

virtual void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) = 0; //!< Set geometry

static QPen defaultPenReq() { return s_defaultPenReq; } //!< Get default pen for required constraints

static QPen defaultPenRed() { return s_defaultPenRed; } //!< Get default pen for redundant constraints

static void setDefaultPenReq( const QPen &p) { s_defaultPenReq = p; } //!< Set default pen for required constraints

static void setDefaultPenRed( const QPen &p) { s_defaultPenRed = p; } //!< Set default pen for redundant constraints

static void setPenSelected( const QPen &p) { s_penSelected = p;} //!< Set pen for selection

static void setDefaultMarkerSize( int s) { s_defaultMarkerSize = s; } //!< Set default marker size

static void toggleShow() { s_show = !s_show; } //!< Toggle visibility

static void toggleShowColor() { s_showColor =! s_showColor; } //!< Toggle colorization (on/off)

static bool show() {return s_show;} //!< Get status visibility

protected:

~QConstraintBase() override = default;

virtual qreal markerSize() const = 0; //!< Set marker size

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override; //!< Plot marker

void mousePressEvent(QGraphicsSceneMouseEvent *) override; //!< Handle mouse press event

static bool showColor() { return s_showColor; } //!< Get status automatic colorization (on/off)

static int s_defaultMarkerSize; //!< Default marker size

static QPen s_defaultPenReq; //!< Default pen for required constraints

static QPen s_defaultPenRed; //!< Default pen for redundant constraints

static QPen s_penSelected; //!< Pen for selection

const double m_sc = 1000; //!< Scale factor coordinates screen // TODO(meijoc)

QColor m_altColor; //!< Color for automatic colorization (subtasks)

QPen m_pen_req; //!< Pen for required constraint

QPen m_pen_red; //!< Pen for redundant constraint

bool m_is_required = true; //!< Constraint is required? (for painting)

bool m_is_enforced = false; //!< Constraint is enforced? (for painting)

private:

virtual std::shared_ptr<QConstraintBase> doClone() const = 0;

static bool s_showColor;

static bool s_show;

};

//! Graphics: Three copunctual straight lines (circle)

class QCopunctual : public QConstraintBase,

public QGraphicsEllipseItem

{

public:

static std::shared_ptr<QConstraintBase> create(); //!< Create copunctual constraint

void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) override;

void setMarkerSize ( qreal s) override;

qreal markerSize() const override;

protected:

QCopunctual();

QCopunctual( const QCopunctual & other); //!< Copy constructor

QRectF boundingRect() const override; //!< Get axis-aligned bounding box

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override; //!< Plot the circle

private:

// std::shared_ptr<QConstraintBase> clone() const override;

std::shared_ptr<QConstraintBase> doClone() const override;

};

//! Graphics: Two orthogonal straight lines (square)

class QOrthogonal : public QConstraintBase,

public QGraphicsRectItem

{

public:

static std::shared_ptr<QConstraintBase> create(); //!< Create orthogonallity constraint

void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) override;

void setMarkerSize ( qreal s) override;

qreal markerSize() const override;

protected:

QOrthogonal();

QOrthogonal( const QOrthogonal & other); //!< Copy constructor

QRectF boundingRect() const override; //!< Get axis-aligned bounding box

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override; //!< Plot square

private:

// std::shared_ptr<QConstraintBase> clone() const override;

std::shared_ptr<QConstraintBase> doClone() const override;

};

//! Graphics: Marker for indentity

class QIdentical : public QConstraintBase,

public QGraphicsPolygonItem

{

public:

static std::shared_ptr<QConstraintBase> create(); //!< Create identity constraint

void setMarkerSize ( qreal s) override;

qreal markerSize() const override;

void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) override;

protected:

QIdentical();

QIdentical( const QIdentical & other); //!< Copy constructor

QRectF boundingRect() const override; //!< Get axis-aligned bounding box

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override; //!< Plot marker

private:

// std::shared_ptr<QConstraintBase> clone() const override;

std::shared_ptr<QConstraintBase> doClone() const override;

};

//! Graphics: Marker for parallelism

class QParallel : public QConstraintBase

{

public:

static std::shared_ptr<QConstraintBase> create(); //!< Create parallelism constraint

void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) override;

void setMarkerSize ( qreal s) override;

qreal markerSize() const override;

protected:

QParallel();

QParallel( const QParallel & other); //!< Copy constructor

QRectF boundingRect() const override; //!< Get axis-aligned bounding box

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override; //!< Plot marker

private:

// std::shared_ptr<QConstraintBase> clone() const override;

std::shared_ptr<QConstraintBase> doClone() const override;

QGraphicsLineItem a;

QGraphicsLineItem b;

static constexpr double s_sc = 0.2;

static constexpr double s_shear = 0.1;

};

} // namespace QConstraint

#endif // QCONSTRAINTS_H