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#include <QPainter>
#include <QtQuick/QQuickView>
#include <QGuiApplication>
#include <QEasingCurve>
#include <QtQuick/QQuickPaintedItem>

class EasingPlot : public QQuickPaintedItem
{
    Q_OBJECT
    Q_PROPERTY(QEasingCurve easing READ easing WRITE setEasing NOTIFY easingChanged);

public:
    EasingPlot();

    QEasingCurve easing() const;
    void setEasing(const QEasingCurve &);

signals:
    void easingChanged();

protected:
    virtual void paint(QPainter *painter);

private:
    QEasingCurve m_easing;
};

EasingPlot::EasingPlot()
{
}

QEasingCurve EasingPlot::easing() const
{
    return m_easing;
}

void EasingPlot::setEasing(const QEasingCurve &e)
{
    if (m_easing == e)
        return;

    m_easing = e;
    emit easingChanged();

    update();
}

void EasingPlot::paint(QPainter *painter)
{
    QPointF lastPoint(0, 0);

    for (int ii = 1; ii <= 100; ++ii) {
        qreal value = m_easing.valueForProgress(qreal(ii) / 100.);

        QPointF currentPoint(width() * qreal(ii) / 100., value * (height() - 1));
        painter->drawLine(lastPoint, currentPoint);

        lastPoint = currentPoint;
    }
}

int main(int argc, char ** argv)
{
    QGuiApplication app(argc, argv);

    qmlRegisterType<EasingPlot>("EasingPlot", 1, 0, "EasingPlot");

    QQuickView view;
    view.setSource(QUrl("qrc:/easing.qml"));
    view.show();

    return app.exec();
}

#include "main.moc"