OscilloscopeWidget.h

#pragma once

#include <QWidget>
#include <QVector>
#include <QPixmap>
#include <QTimer>
#include <QFont>

class OscilloscopeWidget : public QWidget {
    Q_OBJECT
public:
    enum TriggerMode { Auto, Normal, Single };
    Q_ENUM(TriggerMode)

    enum TriggerEdge { Rising, Falling, Both };
    Q_ENUM(TriggerEdge)

    explicit OscilloscopeWidget(QWidget *parent = nullptr);

    void appendSamples(const QVector<uint16_t> &samples);
    void clearData();

    void setMaxDisplayPoints(int count);
    void setVoltageRange(double minV, double maxV);
    void setTriggerMode(TriggerMode mode);
    void setTriggerEdge(TriggerEdge edge);
    void setTriggerLevel(double voltage);
    void armTrigger();  // Single 模式下重新使能触发

    QSize sizeHint() const override { return QSize(600, 300); }
    QSize minimumSizeHint() const override { return QSize(200, 120); }

protected:
    void paintEvent(QPaintEvent *event) override;
    void resizeEvent(QResizeEvent *event) override;

private slots:
    void onRefreshTimer();

private:
    void rebuildBackground();
    void rebuildOffscreen();
    int findTriggerPoint() const;
    uint16_t voltageToAdc(double voltage) const;

    int m_maxDisplayPoints = 400;
    double m_minVoltage = 0.0;
    double m_maxVoltage = 3.3;

    // 触发
    TriggerMode m_triggerMode = Auto;
    TriggerEdge m_triggerEdge = Rising;
    double m_triggerLevel = 1.65;  // 默认中间电压
    bool m_triggered = false;       // Normal/Single 下是否已触发
    bool m_armed = true;            // Single 模式下是否使能

    // 显示起点：Auto 模式为 -1（自由滚动），Normal/Single 为触发点
    int m_displayStartIdx = -1;

    QVector<uint16_t> m_data;

    QPixmap m_background;      // 网格+标签背景层（仅resize/电压范围变化时重建）
    bool m_bgDirty = true;     // 背景是否需要重建
    QPixmap m_offscreen;       // 完整帧缓存
    bool m_offscreenDirty = true;
    bool m_dataDirty = false;

    QTimer *m_refreshTimer;
    QFont m_labelFont;         // Y轴/X轴标签字体
    QFont m_valueFont;         // 当前值显示字体

    static constexpr int LEFT_MARGIN = 50;
    static constexpr int RIGHT_MARGIN = 10;
    static constexpr int TOP_MARGIN = 20;
    static constexpr int BOTTOM_MARGIN = 25;

    static constexpr int MAX_BUFFER_POINTS = 100000; // ~200KB，约0.5秒@200kHz

    static constexpr QRgb WAVE_RGB = 0xff89b4fa;    // ARGB: #89b4fa
    static constexpr QRgb TRIGGER_RGB = 0xfff9e2af;  // ARGB: #f9e2af (黄色触发电平线)
};