/****************************************************************************
**
** 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 "chartanimator_p.h"
#include <QPainter>

QTCOMMERCIALCHART_BEGIN_NAMESPACE

SplineChartItem::SplineChartItem(QSplineSeries *series, ChartPresenter *presenter) :
    XYChartItem(series, presenter),
    m_series(series),
    m_pointsVisible(false)
{
    setZValue(ChartPresenter::LineChartZValue);
    QObject::connect(m_series->d_func(),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 (animator()) {
       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