KDChartRingDiagram.h

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/****************************************************************************
**
** This file is part of the KD Chart library.
**
** SPDX-FileCopyrightText: 2001 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
**
** SPDX-License-Identifier: MIT
**
****************************************************************************/
 
#ifndef KDCHARTRINGDIAGRAM_H
#define KDCHARTRINGDIAGRAM_H
 
#include "KDChartAbstractPieDiagram.h"
 
namespace KDChart {
 
class KDCHART_EXPORT RingDiagram : public AbstractPieDiagram
{
    Q_OBJECT
 
    Q_DISABLE_COPY(RingDiagram)
    KDCHART_DECLARE_DERIVED_DIAGRAM(RingDiagram, PolarCoordinatePlane)
 
public:
    explicit RingDiagram(
        QWidget *parent = nullptr, PolarCoordinatePlane *plane = nullptr);
    ~RingDiagram() override;
 
protected:
    // Implement AbstractDiagram
    void paint(PaintContext *paintContext) override;
 
public:
    void resize(const QSizeF &area) override;
 
    // Implement AbstractPolarDiagram
    qreal valueTotals() const override;
    qreal numberOfValuesPerDataset() const override;
    qreal numberOfDatasets() const override;
    qreal numberOfGridRings() const override;
 
    qreal valueTotals(int dataset) const;
 
    virtual RingDiagram *clone() const;
 
    bool compare(const RingDiagram *other) const;
 
    void setRelativeThickness(bool relativeThickness);
    bool relativeThickness() const;
 
    virtual void setExpandWhenExploded(bool expand);
    virtual bool expandWhenExploded() const;
 
protected:
    const QPair<QPointF, QPointF> calculateDataBoundaries() const override;
    void paintEvent(QPaintEvent *) override;
    void resizeEvent(QResizeEvent *) override;
 
private:
    void drawOneSlice(QPainter *painter, uint dataset, uint slice, qreal granularity);
    void drawPieSurface(QPainter *painter, uint dataset, uint slice, qreal granularity);
    QPointF pointOnEllipse(const QRectF &rect, int dataset, int slice, bool outer, qreal angle,
                           qreal totalGapFactor, qreal totalExplodeFactor);
}; // End of class RingDiagram
}
 
#endif // KDCHARTRINGDIAGRAM_H