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2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt Charts module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:GPL$
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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 LINECHARTITEM_H
40#define LINECHARTITEM_H
41
42#include <QtCharts/QChartGlobal>
43#include <private/xychart_p.h>
44#include <QtCharts/QChart>
45#include <QtGui/QPen>
46#include <QtCharts/private/qchartglobal_p.h>
47
48QT_CHARTS_BEGIN_NAMESPACE
49
50class QLineSeries;
51class ChartPresenter;
52
53class Q_CHARTS_PRIVATE_EXPORT LineChartItem : public XYChart
54{
55 Q_OBJECT
56 Q_INTERFACES(QGraphicsItem)
57public:
58 explicit LineChartItem(QLineSeries *series, QGraphicsItem *item = 0);
59 ~LineChartItem() {}
60
61 //from QGraphicsItem
62 QRectF boundingRect() const;
63 void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
64 QPainterPath shape() const;
65
66 QPainterPath path() const { return m_fullPath; }
67
68public Q_SLOTS:
69 void handleUpdated();
70
71protected:
72 void updateGeometry();
73 void mousePressEvent(QGraphicsSceneMouseEvent *event);
74 void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
75 void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
76 void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
77 void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
78 void suppressPoints() { m_pointsVisible = false; }
79 void forceChartType(QChart::ChartType chartType) { m_chartType = chartType; }
80
81private:
82 QLineSeries *m_series;
83 QPainterPath m_linePath;
84 QPainterPath m_linePathPolarRight;
85 QPainterPath m_linePathPolarLeft;
86 QPainterPath m_fullPath;
87 QPainterPath m_shapePath;
88
89 QVector<QPointF> m_linePoints;
90 QRectF m_rect;
91 QPen m_linePen;
92 bool m_pointsVisible;
93 QChart::ChartType m_chartType;
94
95 bool m_pointLabelsVisible;
96 QString m_pointLabelsFormat;
97 QFont m_pointLabelsFont;
98 QColor m_pointLabelsColor;
99 bool m_pointLabelsClipping;
100
101 QPointF m_lastMousePos;
102 bool m_mousePressed;
103};
104
105QT_CHARTS_END_NAMESPACE
106
107#endif
108

source code of qtcharts/src/charts/linechart/linechartitem_p.h