HX_CoalFlowDetect/view/beltspeedlinewidget.cpp

#include "beltspeedlinewidget.h"

#include <QDateTimeAxis>
#include <QRandomGenerator>
#include <QVBoxLayout>

BeltSpeedLineWidget::BeltSpeedLineWidget(QWidget* parent)
    : QWidget(parent)
{
    initLineChart();
}

void BeltSpeedLineWidget::initLineChart()
{
    // 创建图表视图
    m_chartView = new QChartView(this);

    m_chartView->setBackgroundBrush(Qt::transparent);
    m_chartView->setStyleSheet("background: transparent;"); // 使用样式表确保透明
    m_chartView->setRenderHint(QPainter::Antialiasing);
    m_chartView->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

    m_chart = new QChart();
    m_chart->setBackgroundBrush(Qt::transparent);
    m_chart->setMargins(QMargins(0, 0, 0, 0));
    m_chart->legend()->hide();

    // 创建折线系列
    m_series = new QLineSeries();
    m_series->setPointsVisible(false); // 隐藏数据点的标记
    //    m_series->setMarkerShape(QLineSeries::MarkerShapeNone); // 隐藏标记形状

    // 将系列添加到图表
    m_chart->addSeries(m_series);
    m_chart->createDefaultAxes();

    // TODO:假设数据点，替换为你的实时数据
    QDateTime currentTime = QDateTime::currentDateTime();
    QRandomGenerator* generator = QRandomGenerator::global();
    double previousSpeed = 10.0; // 初始速度值在中间
    for (int i = 0; i < 120; ++i) { // 120个数据点，代表最近两个小时
        // 根据前一个速度值生成新的速度值，保持在5到15之间
        double fluctuation = generator->generateDouble() * 2.0 - 1.0; // 生成 -1.0 到 1.0 之间的浮动 // 小范围波动
        double speed = previousSpeed + fluctuation;

        // 确保速度在5到15之间
        if (speed < 5.0) {
            speed = 5.0;
        } else if (speed > 15.0) {
            speed = 15.0;
        }

        m_series->append(currentTime.addSecs(-i * 60).toMSecsSinceEpoch(), speed);
        previousSpeed = speed; // 更新前一个速度值
    }

    // 创建并设置X轴为日期时间轴
    QDateTimeAxis* xAxis = new QDateTimeAxis();
    xAxis->setFormat("hh:mm:ss");
    xAxis->setRange(currentTime.addSecs(-7200), currentTime); // 设置范围为最近两个小时
    xAxis->setLinePen(QPen(Qt::gray));
    xAxis->setLabelsColor(Qt::gray);
    m_chart->setAxisX(xAxis, m_series); // 将X轴应用到数据系列

    // 设置Y轴范围
    m_chart->axisY()->setRange(0, 20);
    m_chart->axisY()->setTitleText("速度 (m/s)");

    m_chart->axisY()->setTitleBrush(QBrush(Qt::gray));
    m_chart->axisY()->setLinePen(QPen(Qt::gray));
    m_chart->axisY()->setLabelsColor(Qt::gray);

    // 设置图表到视图并将视图设置为中心部件
    m_chartView->setChart(m_chart);

    QVBoxLayout* layout = new QVBoxLayout(this);
    layout->setContentsMargins(0, 0, 0, 0);
    layout->setSpacing(0); // 设置间距为0
    layout->addWidget(m_chartView);
    setLayout(layout);
}