/*
    Scan Tailor - Interactive post-processing tool for scanned pages.
    Copyright (C)  Joseph Artsimovich <joseph.artsimovich@gmail.com>

    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 <http://www.gnu.org/licenses/>.
*/

#include "PhysSizeCalc.h"
#include "ImageTransformation.h"
#include "PhysicalTransformation.h"
#include <QPolygonF>

namespace select_content
{

PhysSizeCalc::PhysSizeCalc()
{
}

PhysSizeCalc::PhysSizeCalc(ImageTransformation const& xform)
    :   m_virtToPhys(xform.transformBack() * PhysicalTransformation(xform.origDpi()).pixelsToMM())
{
}

QSizeF
PhysSizeCalc::sizeMM(QRectF const& rect_px) const
{
    QPolygonF const poly_mm(m_virtToPhys.map(rect_px));
    QSizeF const size_mm(
        QLineF(poly_mm[0], poly_mm[1]).length(),
        QLineF(poly_mm[1], poly_mm[2]).length()
    );
    return size_mm;
}

} // namespace select_content
