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cubicbezierspline.cpp
/***************************************************************************
 *   Copyright (C) 2010 by Till Theato (root@ttill.de)                     *
 *   This file is part of Kdenlive (www.kdenlive.org).                     *
 *                                                                         *
 *   Kdenlive 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   Kdenlive 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 Kdenlive.  If not, see <http://www.gnu.org/licenses/>.     *
 ***************************************************************************/

#include "cubicbezierspline.h"
#include <KDebug>

/** @brief For sorting a Bezier spline. Whether a is before b. */
static bool pointLessThan(const BPoint &a, const BPoint &b)
{
    return a.p.x() < b.p.x();
}

CubicBezierSpline::CubicBezierSpline(QObject* parent) :
        QObject(parent)
{
    m_points.append(BPoint(QPointF(0, 0), QPointF(0, 0), QPointF(.1, .1)));
    m_points.append(BPoint(QPointF(.9, .9), QPointF(1, 1), QPointF(1, 1)));
}

CubicBezierSpline::CubicBezierSpline(const CubicBezierSpline& spline, QObject* parent) :
        QObject(parent)
{
    m_points = spline.m_points;
}

CubicBezierSpline& CubicBezierSpline::operator=(const CubicBezierSpline& spline)
{
    m_points = spline.m_points;
    return *this;
}

00047 void CubicBezierSpline::fromString(const QString& spline)
{
    m_points.clear();

    QStringList bpoints = spline.split('|');
    foreach(const QString &bpoint, bpoints) {
        QStringList points = bpoint.split('#');
        QList <QPointF> values;
        foreach(const QString &point, points) {
            QStringList xy = point.split(';');
            if (xy.count() == 2)
                values.append(QPointF(xy.at(0).toDouble(), xy.at(1).toDouble()));
        }
        if (values.count() == 3) {
            m_points.append(BPoint(values.at(0), values.at(1), values.at(2)));
        }
    }

    keepSorted();
    validatePoints();
}

00069 QString CubicBezierSpline::toString() const
{
    QStringList spline;
    QLocale locale;
    foreach(const BPoint &p, m_points) {
        spline << QString("%1;%2#%3;%4#%5;%6").arg(locale.toString(p.h1.x())).arg(locale.toString(p.h1.y()))
                                              .arg(locale.toString(p.p.x())).arg(locale.toString(p.p.y()))
                                              .arg(locale.toString(p.h2.x())).arg(locale.toString(p.h2.y()));
    }
    return spline.join("|");
}

00081 int CubicBezierSpline::setPoint(int ix, const BPoint& point)
{
    m_points[ix] = point;
    keepSorted();
    validatePoints();
    return indexOf(point); // in case it changed
}

00089 QList <BPoint> CubicBezierSpline::points()
{
    return m_points;
}

00094 void CubicBezierSpline::removePoint(int ix)
{
    m_points.removeAt(ix);
}

00099 int CubicBezierSpline::addPoint(const BPoint& point)
{
    m_points.append(point);
    keepSorted();
    validatePoints();
    return indexOf(point);
}

00107 BPoint CubicBezierSpline::getPoint(int ix, int normalisedWidth, int normalisedHeight, bool invertHeight)
{
    BPoint p = m_points.at(ix);
    for (int i = 0; i < 3; ++i) {
        p[i].rx() *= normalisedWidth;
        p[i].ry() *= normalisedHeight;
        if (invertHeight)
            p[i].ry() = normalisedHeight - p[i].y();
    }
    return p;
}

void CubicBezierSpline::validatePoints()
{
    BPoint p1, p2;
    for (int i = 0; i < m_points.count() - 1; ++i) {
        p1 = m_points.at(i);
        p2 = m_points.at(i+1);
        p1.h2.setX(qBound(p1.p.x(), p1.h2.x(), p2.p.x()));
        p2.h1.setX(qBound(p1.p.x(), p2.h1.x(), p2.p.x()));
        m_points[i] = p1;
        m_points[i+1] = p2;
    }
}

void CubicBezierSpline::keepSorted()
{
    qSort(m_points.begin(), m_points.end(), pointLessThan);
}

int CubicBezierSpline::indexOf(const BPoint& p)
{
    if (m_points.indexOf(p) == -1) {
        // point changed during validation process
        for (int i = 0; i < m_points.count(); ++i) {
            // this condition should be sufficient, too
            if (m_points.at(i).p == p.p)
                return i;
        }
    } else {
        return m_points.indexOf(p);
    }
    return -1;
}

#include "cubicbezierspline.moc"

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