67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
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#ifndef CURVEPLOTWIDGET_H
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#define CURVEPLOTWIDGET_H
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#include <QWidget>
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#include <QVector>
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#include <QColor>
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#include <QMap>
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#include <QElapsedTimer>
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struct CurveCfg
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{
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QString name; // 图例
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double yMax; // y 满量程
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QColor normal; // 绿色（正常）
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QColor warning; // 橙色（警告）
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QColor fault; // 红色（故障）
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double thWarning; // 警告阈值
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double thFault; // 故障阈值
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};
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class CurvePlotWidget : public QWidget
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{
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Q_OBJECT
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public:
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explicit CurvePlotWidget(QWidget *parent = nullptr);
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/* x 轴总时长（秒） */
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void setTimeRange(double secs);
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/* 添加一条曲线 */
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void initCurve(int id, const CurveCfg &cfg);
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/* 清空所有曲线 */
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void clearAllCurves();
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/* 追加数据，yValue 为物理量，timeStamp 为 QDateTime::toMSecsSinceEpoch()/1000.0 */
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void appendPoint(int curveId, double timeStamp, double yValue);
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protected:
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void paintEvent(QPaintEvent *event) override;
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void resizeEvent(QResizeEvent *event) override;
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private:
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struct Curve
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{
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CurveCfg cfg;
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QVector<double> tBuf;
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QVector<double> yBuf;
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int head = 0;
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};
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double m_tRange = 10.0; // 总时长（秒）
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int m_xMax = 72000; // 内部缓冲区点数
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int m_topMargin = 40; // 顶部留图例
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int m_bottomMargin = 25; // X 轴
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int m_leftMargin = 35; // Y 轴
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int m_rightMargin = 10;
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QMap<int, Curve> m_curves;
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double m_t0 = 0; // 第一条数据的时间基准
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bool m_t0set = false;
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QPointF mapToWidget(double t, double y, const Curve &c) const;
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};
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#endif // CURVEPLOTWIDGET_H
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