#include "splinechartitem_p.h"
#include "chartpresenter_p.h"
#include "chartanimator_p.h"
#include <QPainter>

QTCOMMERCIALCHART_BEGIN_NAMESPACE

SplineChartItem::SplineChartItem(QSplineSeries* series, QGraphicsItem *parent) :
XYChartItem(series, parent),
m_series(series),
m_pointsVisible(false)
{
    setZValue(ChartPresenter::LineChartZValue);
    QObject::connect(series,SIGNAL(updated()),this,SLOT(handleUpdated()));
    handleUpdated();
}

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

QPainterPath SplineChartItem::shape() const
{
    return m_path;
}

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

    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(controlPoints.count()<2) {
        setLayout(newPoints,controlPoints);
        return;
    }

    if(m_animator){
       m_animator->updateLayout(this,oldPoints,newPoints,m_controlPoints,controlPoints,index);
    }else{
       setLayout(newPoints,controlPoints);
    }
}

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

void SplineChartItem::setLayout(QVector<QPointF>& points,QVector<QPointF>& controlPoints)
{
    if(points.size()<2 || controlPoints.size()<2)
    {
        XYChartItem::setLayout(points);
        m_controlPoints=controlPoints;
        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();
    m_path = splinePath;
    m_rect = splinePath.boundingRect();
    XYChartItem::setLayout(points);
    m_controlPoints=controlPoints;
}

//handlers

void SplineChartItem::handleUpdated()
{
    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(clipRect());
    painter->setPen(m_linePen);
    painter->drawPath(m_path);
    if(m_pointsVisible){
           painter->setPen(m_pointPen);
           painter->drawPoints(points());
    }
    painter->restore();
}



#include "moc_splinechartitem_p.cpp"

QTCOMMERCIALCHART_END_NAMESPACE