valentina/src/app/geometry/vabstractcurve.cpp

/************************************************************************
 **
 **  @file   vabstractcurve.cpp
 **  @author Roman Telezhynskyi <dismine(at)gmail.com>
 **  @date   25 6, 2014
 **
 **  @brief
 **  @copyright
 **  This source code is part of the Valentine project, a pattern making
 **  program, whose allow create and modeling patterns of clothing.
 **  Copyright (C) 2014 Valentina project
 **  <https://bitbucket.org/dismine/valentina> All Rights Reserved.
 **
 **  Valentina 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.
 **
 **  Valentina 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 Valentina.  If not, see <http://www.gnu.org/licenses/>.
 **
 *************************************************************************/

#include "vabstractcurve.h"

#include <QPainterPath>

VAbstractCurve::VAbstractCurve(const GOType &type, const quint32 &idObject, const Draw &mode)
    :VGObject(type, idObject, mode)
{}

//---------------------------------------------------------------------------------------------------------------------
VAbstractCurve::VAbstractCurve(const VAbstractCurve &curve)
    :VGObject(curve)
{}

//---------------------------------------------------------------------------------------------------------------------
VAbstractCurve &VAbstractCurve::operator=(const VAbstractCurve &curve)
{
    if ( &curve == this )
    {
        return *this;
    }
    VGObject::operator=(curve);
    return *this;
}

//---------------------------------------------------------------------------------------------------------------------
QPainterPath VAbstractCurve::GetPath(PathDirection direction) const
{
    QPainterPath path;

    QVector<QPointF> points = GetPoints();
    if (points.count() >= 2)
    {
        for (qint32 i = 0; i < points.count()-1; ++i)
        {
            path.moveTo(points.at(i));
            path.lineTo(points.at(i+1));
        }

        if (direction == PathDirection::Show && points.count() >= 3)
        {
            path.addPath(ShowDirection(points));
        }
    }
    else
    {
        qDebug()<<"points.count() < 2"<<Q_FUNC_INFO;
    }
    return path;
}

//---------------------------------------------------------------------------------------------------------------------
QPainterPath VAbstractCurve::ShowDirection(const QVector<QPointF> &points) const
{
    QPainterPath path;

    if (points.count() >= 2)
    {
        /*Need find coordinate midle of curve.
          Universal way is take all points and find sum.*/
        const qreal seek_length = GetLength()/2.0;
        qreal found_length = 0;
        QLineF arrow;
        for (qint32 i = 1; i <= points.size()-1; ++i)
        {
            arrow = QLineF(points.at(i-1), points.at(i));
            found_length += arrow.length();//Length that we aready find

            if (seek_length <= found_length)// if have found more that need stop.
            {
                //subtract length in last line and you will find position of the middle point.
                arrow.setLength(arrow.length() - (found_length - seek_length));
                break;
            }
        }

        //Reverse line because we want start arrow from this point
        arrow = QLineF(arrow.p2(), arrow.p1());
        const qreal angle = arrow.angle();//we each time change line angle, better save original angle value
        arrow.setLength(14);//arrow length in pixels

        arrow.setAngle(angle-35);
        path.moveTo(arrow.p1());
        path.lineTo(arrow.p2());

        arrow.setAngle(angle+35);
        path.moveTo(arrow.p1());
        path.lineTo(arrow.p2());
    }
    return path;
}