/****************************************************************************
 **
 ** Copyright (C) 2012 Digia Plc
 ** All rights reserved.
 ** For any questions to Digia, please use contact form at http://qt.digia.com
 **
 ** This file is part of the Qt Commercial Charts Add-on.
 **
 ** $QT_BEGIN_LICENSE$
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Digia.
 **
 ** If you have questions regarding the use of this file, please use
 ** contact form at http://qt.digia.com
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

#include "splinechartitem_p.h"
#include "qsplineseries_p.h"
#include "chartpresenter_p.h"
#include "splineanimation_p.h"
#include "abstractdomain_p.h"
#include <QPainter>
#include <QGraphicsSceneMouseEvent>

QTCOMMERCIALCHART_BEGIN_NAMESPACE

SplineChartItem::SplineChartItem(QSplineSeries *series, QGraphicsItem* item)
    : XYChart(series,item),
      m_series(series),
      m_pointsVisible(false),
      m_animation(0)
{
    setAcceptHoverEvents(true);
    setZValue(ChartPresenter::SplineChartZValue);
    QObject::connect(m_series->d_func(), SIGNAL(updated()), this, SLOT(handleUpdated()));
    QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated()));
    QObject::connect(series, SIGNAL(opacityChanged()), this, SLOT(handleUpdated()));
    handleUpdated();
}

QRectF SplineChartItem::boundingRect() const
{
    return m_rect;
}

QPainterPath SplineChartItem::shape() const
{
    QPainterPathStroker stroker;
    return stroker.createStroke(m_path);
}

void SplineChartItem::setAnimation(SplineAnimation *animation)
{
    m_animation = animation;
    XYChart::setAnimation(animation);
}

ChartAnimation *SplineChartItem::animation() const
{
    return m_animation;
}

void SplineChartItem::setControlGeometryPoints(QVector<QPointF>& points)
{
    m_controlPoints = points;
}

QVector<QPointF> SplineChartItem::controlGeometryPoints() const
{
    return m_controlPoints;
}

void SplineChartItem::updateChart(QVector<QPointF> &oldPoints, QVector<QPointF> &newPoints, int index)
{
    QVector<QPointF> controlPoints;

    if (newPoints.count() >= 2)
        controlPoints.resize(newPoints.count() * 2 - 2);

    for (int i = 0; i < newPoints.size() - 1; i++) {
        controlPoints[2 * i] = calculateGeometryControlPoint(2 * i);
        controlPoints[2 * i + 1] = calculateGeometryControlPoint(2 * i + 1);
    }

    if (m_animation)
        m_animation->setup(oldPoints, newPoints, m_controlPoints, controlPoints, index);

    m_points = newPoints;
    m_controlPoints = controlPoints;
    setDirty(false);

    if (m_animation)
        presenter()->startAnimation(m_animation);
    else
        updateGeometry();
}

QPointF SplineChartItem::calculateGeometryControlPoint(int index) const
{
    return domain()->calculateGeometryPoint(m_series->d_func()->controlPoint(index));
}

void SplineChartItem::updateGeometry()
{
    const QVector<QPointF> &points = m_points;
    const QVector<QPointF> &controlPoints = m_controlPoints;

    if ((points.size() < 2) || (controlPoints.size() < 2)) {
        prepareGeometryChange();
        m_path = QPainterPath();
        m_rect = QRect();
        return;
    }

    Q_ASSERT(points.count() * 2 - 2 == controlPoints.count());

    QPainterPath splinePath(points.at(0));

    for (int i = 0; i < points.size() - 1; i++) {
        const QPointF &point = points.at(i + 1);
        splinePath.cubicTo(controlPoints[2 * i], controlPoints[2 * i + 1], point);
    }

    prepareGeometryChange();
    //    QPainterPathStroker stroker;
    //    stroker.setWidth(m_linePen.width() / 2.0);
    //    m_path = stroker.createStroke(splinePath);
    m_path = splinePath;
    m_rect = splinePath.boundingRect();

}

//handlers

void SplineChartItem::handleUpdated()
{
    setVisible(m_series->isVisible());
    setOpacity(m_series->opacity());
    m_pointsVisible = m_series->pointsVisible();
    m_linePen = m_series->pen();
    m_pointPen = m_series->pen();
    m_pointPen.setWidthF(2 * m_pointPen.width());
    update();
}

//painter

void SplineChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    Q_UNUSED(widget)
    Q_UNUSED(option)

    painter->save();
    painter->setClipRect(QRectF(QPointF(0,0),domain()->size()));
    painter->setPen(m_linePen);
    //    painter->setBrush(m_linePen.color());

    painter->drawPath(m_path);
    if (m_pointsVisible) {
        painter->setPen(m_pointPen);
        painter->drawPoints(geometryPoints());
    }
    painter->restore();
}

void SplineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    emit XYChart::clicked(domain()->calculateDomainPoint(event->pos()));
    QGraphicsItem::mousePressEvent(event);
}

void SplineChartItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
{
    emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), true);
    event->accept();
}

void SplineChartItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
    emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), false);
    event->accept();
}

#include "moc_splinechartitem_p.cpp"

QTCOMMERCIALCHART_END_NAMESPACE