delegatedlinedata.h

/*
   Copyright (C) 2020 Denis Gofman - <sendevent@gmail.com>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program. If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
*/

#include <QDebug>
#include <QLineF>
#include <QObject>
#include <QRect>

#pragma once

/*!
 * \brief The Line struct is a wrapper for a line to be drawn by delegate
 * \a from & \a to are the X coordinates of start and end point in cell in logical range [0.0, 1.0].
 */

struct Line {
    static constexpr int DataRole = Qt::UserRole + 1;
    qreal from;
    qreal to;

    bool isEmpty() const { return qFuzzyCompare(from, to); }
    bool isFull() const { return !isEmpty() && qFuzzyIsNull(from) && qFuzzyCompare(1., to); }

    QLineF toQLine(const QRect &viewport) const
    {
        const QPoint &center = viewport.center();
        QPointF p1(viewport.left(), center.y());
        QPointF p2(viewport.right(), center.y());

        if (!isFull()) {
            p1.rx() = viewport.left() + viewport.width() * qreal(from);
            p2.rx() = viewport.left() + viewport.width() * qreal(to);
        }

        return { p1, p2 };
    }

    static Line fromQLine(const QLine &line, const QRect &viewport)
    {
        const qreal w(viewport.width());
        return { qreal(line.x1()) / w, qreal(line.x2()) / w };
    }
};

Q_DECLARE_METATYPE(Line);