/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Charts module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
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** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
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//  W A R N I N G
//  -------------
//
// This file is not part of the Qt Chart API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef PIESLICEITEM_H
#define PIESLICEITEM_H

#include <QtCharts/QChartGlobal>
#include <private/charttheme_p.h>
#include <QtCharts/QPieSeries>
#include <private/pieslicedata_p.h>
#include <QtWidgets/QGraphicsItem>
#include <QtCore/QRectF>
#include <QtGui/QColor>
#include <QtGui/QPen>

#define PIESLICE_LABEL_GAP 5

QT_CHARTS_BEGIN_NAMESPACE
class PieChartItem;
class PieSliceLabel;
class QPieSlice;

class PieSliceItem : public QGraphicsObject
{
    Q_OBJECT

public:
    PieSliceItem(QGraphicsItem *parent = 0);
    ~PieSliceItem();

    // from QGraphicsItem
    QRectF boundingRect() const;
    QPainterPath shape() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
    void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
    void mousePressEvent(QGraphicsSceneMouseEvent *event);
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);

    void setLayout(const PieSliceData &sliceData);
    static QPointF sliceCenter(QPointF point, qreal radius, QPieSlice *slice);

Q_SIGNALS:
    void clicked(Qt::MouseButtons buttons);
    void hovered(bool state);
    void pressed(Qt::MouseButtons buttons);
    void released(Qt::MouseButtons buttons);
    void doubleClicked(Qt::MouseButtons buttons);

private:
    void updateGeometry();
    QPainterPath slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF *armStart);
    QPainterPath labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart);

private:
    PieSliceData m_data;
    QRectF m_boundingRect;
    QPainterPath m_slicePath;
    QPainterPath m_labelArmPath;
    QRectF m_labelTextRect;
    bool m_hovered;
    QGraphicsTextItem *m_labelItem;

    bool m_mousePressed;

    friend class PieSliceAnimation;
};

QT_CHARTS_END_NAMESPACE

#endif // PIESLICEITEM_H