/*

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

* Copyright (c) 2022-2023 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 MAINSCENE_H

#define MAINSCENE_H

#include <QAction>

#include <QDebug>

#include <QGraphicsPathItem>

#include <QGraphicsScene>

#include <memory>

#include "global.h"

class State;

namespace GUI {

//! Graphics scene

class MainScene : public QGraphicsScene

{

Q_OBJECT

public:

MainScene( QObject *parent ); //!< Value constructor

~MainScene() override = default; //{ qDebug() << Q_FUNC_INFO; }

protected:

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

void mouseMoveEvent( QGraphicsSceneMouseEvent *event) override; //!< Handle mouse moce event

void mouseReleaseEvent( QGraphicsSceneMouseEvent *event) override; //!< Handle mouse release event

void keyPressEvent( QKeyEvent *event) override; //!< Handle key press event

public:

void removeAllItems(); //!< Remove all graphics from the scene but not an optional background imge

void addGraphicItems( const State *s); //!< Add graphics from state to scene

void export_view_as_svg( QString &fileName); //!< Export the current view as scalabel vector graphics

void export_view_as_pdf( QString &fileName); //!< Export the current view in portable document format

static QPen scribblePen() { return s_scribblePen; } //!< Get the scribble pen

static void setScribblePen( const QPen & p) { s_scribblePen = p; } //!< Set the scribble pen

private:

std::unique_ptr<QAction> actionExportSaveAs;

bool m_scribbling; // tracking the point positions

QGraphicsPathItem m_path_item; // point set (stroke) as graphics item

QPainterPath m_painter_path;

const double threshold_ratio_eigenvalues = 0.01;

const int min_number_of_points = 7;

bool isaStraightStroke( double T, const QPainterPath & );

static QPen s_scribblePen;

Q_SIGNALS:

void signalCmdAddStroke( QPainterPath * ); //!< Command: add a stroke, reasoning, and adjustment

void signalCmdDeleteSelection(); //!< Command: delete selected items and reasoning

void signalUndoLastAction(); //!< Command: und last action

};

} // namespace GUI

#endif // MAINSCENE_H