/*

* 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;

}

namespace QConstraint {

using Uncertain::uStraightLineSegment;

class QConstraintBase : public QGraphicsItem

{

protected:

QConstraintBase();

public:

QConstraintBase( const QConstraintBase & other) = delete;

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

// 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};

int type() const override { return Type; }

void serialize( QDataStream &out );

bool deserialize( QDataStream &);

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

void setColor( const QColor & col) {

m_pen_req.setColor(col);

m_pen_red.setColor(col);

}

void setLineWidth( const int w) {

m_pen_req.setWidth(w);

m_pen_red.setWidth(w);

}

void setLineStyle( const int s) {

m_pen_req.setStyle( Qt::PenStyle(s) );

m_pen_red.setStyle( Qt::PenStyle(s) );

}

void setAltColor(const QColor &col );

void setStatus( bool isrequired,

bool isenforced);

bool enforced() const { return m_is_enforced; }

virtual void setMarkerSize ( qreal s) = 0;

virtual void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) = 0;

static QPen defaultPenReq() { return s_defaultPenReq; }

static QPen defaultPenRed() { return s_defaultPenRed; }

static void setDefaultPenReq( const QPen &p) { s_defaultPenReq = p; }

static void setDefaultPenRed( const QPen &p) { s_defaultPenRed = p; }

static void setPenSelected( const QPen &p) { s_penSelected = p;}

static void setDefaultMarkerSize( int s) { s_defaultMarkerSize = s; }

static void toggleShow() { s_show = !s_show; }

static void toggleShowColor() { s_showColor =! s_showColor; }

static bool show() {return s_show;}

protected:

~QConstraintBase() override = default;

virtual qreal markerSize() const = 0;

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override;

void mousePressEvent(QGraphicsSceneMouseEvent *) override;

bool m_is_required = true; // for painting

bool m_is_enforced = false; // for painting

static bool showColor() { return s_showColor; }

static int s_defaultMarkerSize;

static QPen s_defaultPenReq;

static QPen s_defaultPenRed;

static QPen s_penSelected;

const double m_sc = 1000; // TODO(meijoc) QConstraintBase

QColor m_altColor;

QPen m_pen_req;

QPen m_pen_red;

private:

static bool s_showColor;

static bool s_show;

};

class QCopunctual : public QConstraintBase,

public QGraphicsEllipseItem

{

public:

QCopunctual();

void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) override;

void setMarkerSize ( qreal s) override;

qreal markerSize() const override;

protected:

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

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override;

private:

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

};

class QOrthogonal : public QConstraintBase,

public QGraphicsRectItem

{

public:

QOrthogonal();

public:

void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) override;

void setMarkerSize ( qreal s) override;

qreal markerSize() const override;

protected:

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

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override;

private:

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

};

class QIdentical : public QConstraintBase,

public QGraphicsPolygonItem

{

public:

QIdentical();

void setMarkerSize ( qreal s) override;

qreal markerSize() const override;

void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) override;

protected:

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

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override;

private:

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

};

class QParallel : public QConstraintBase

{

public:

QParallel();

void setGeometry( const uStraightLineSegment &s,

const uStraightLineSegment &t) override;

void setMarkerSize ( qreal s) override;

qreal markerSize() const override;

protected:

QRectF boundingRect() const override;

void paint( QPainter *painter,

const QStyleOptionGraphicsItem *option,

QWidget *widget) override;

private:

std::shared_ptr<QConstraintBase> create() 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