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29
30// W A R N I N G
31// -------------
32//
33// This file is not part of the Qt Chart API. It exists purely as an
34// implementation detail. This header file may change from version to
35// version without notice, or even be removed.
36//
37// We mean it.
38
39#ifndef PIESLICEITEM_H
40#define PIESLICEITEM_H
41
42#include <QtCharts/QChartGlobal>
43#include <private/charttheme_p.h>
44#include <QtCharts/QPieSeries>
45#include <private/pieslicedata_p.h>
46#include <QtCharts/private/qchartglobal_p.h>
47#include <QtWidgets/QGraphicsItem>
48#include <QtCore/QRectF>
49#include <QtGui/QColor>
50#include <QtGui/QPen>
51
52#define PIESLICE_LABEL_GAP 5
53
54QT_CHARTS_BEGIN_NAMESPACE
55class PieChartItem;
56class PieSliceLabel;
57class QPieSlice;
58
59class Q_CHARTS_PRIVATE_EXPORT PieSliceItem : public QGraphicsObject
60{
61 Q_OBJECT
62
63public:
64 PieSliceItem(QGraphicsItem *parent = 0);
65 ~PieSliceItem();
66
67 // from QGraphicsItem
68 QRectF boundingRect() const;
69 QPainterPath shape() const;
70 void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
71 void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
72 void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
73 void mousePressEvent(QGraphicsSceneMouseEvent *event);
74 void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
75 void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
76
77 void setLayout(const PieSliceData &sliceData);
78 static QPointF sliceCenter(QPointF point, qreal radius, QPieSlice *slice);
79
80Q_SIGNALS:
81 void clicked(Qt::MouseButtons buttons);
82 void hovered(bool state);
83 void pressed(Qt::MouseButtons buttons);
84 void released(Qt::MouseButtons buttons);
85 void doubleClicked(Qt::MouseButtons buttons);
86
87private:
88 void updateGeometry();
89 QPainterPath slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF *armStart);
90 QPainterPath labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart);
91
92private:
93 PieSliceData m_data;
94 QRectF m_boundingRect;
95 QPainterPath m_slicePath;
96 QPainterPath m_labelArmPath;
97 QRectF m_labelTextRect;
98 bool m_hovered;
99 QGraphicsTextItem *m_labelItem;
100
101 bool m_mousePressed;
102
103 friend class PieSliceAnimation;
104};
105
106QT_CHARTS_END_NAMESPACE
107
108#endif // PIESLICEITEM_H
109

source code of qtcharts/src/charts/piechart/piesliceitem_p.h