82 lines
2.9 KiB
C++
82 lines
2.9 KiB
C++
#include "beltspeedlinewidget.h"
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#include <QDateTimeAxis>
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#include <QRandomGenerator>
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#include <QVBoxLayout>
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BeltSpeedLineWidget::BeltSpeedLineWidget(QWidget* parent)
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: QWidget(parent)
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{
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initLineChart();
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}
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void BeltSpeedLineWidget::initLineChart()
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{
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// 创建图表视图
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m_chartView = new QChartView(this);
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m_chartView->setBackgroundBrush(Qt::transparent);
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m_chartView->setStyleSheet("background: transparent;"); // 使用样式表确保透明
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m_chartView->setRenderHint(QPainter::Antialiasing);
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m_chartView->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
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m_chart = new QChart();
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m_chart->setBackgroundBrush(Qt::transparent);
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m_chart->setMargins(QMargins(0, 0, 0, 0));
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m_chart->legend()->hide();
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// 创建折线系列
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m_series = new QLineSeries();
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m_series->setPointsVisible(false); // 隐藏数据点的标记
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// m_series->setMarkerShape(QLineSeries::MarkerShapeNone); // 隐藏标记形状
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// 将系列添加到图表
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m_chart->addSeries(m_series);
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m_chart->createDefaultAxes();
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// TODO:假设数据点，替换为你的实时数据
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QDateTime currentTime = QDateTime::currentDateTime();
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QRandomGenerator* generator = QRandomGenerator::global();
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double previousSpeed = 10.0; // 初始速度值在中间
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for (int i = 0; i < 120; ++i) { // 120个数据点，代表最近两个小时
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// 根据前一个速度值生成新的速度值，保持在5到15之间
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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
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double speed = previousSpeed + fluctuation;
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// 确保速度在5到15之间
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if (speed < 5.0) {
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speed = 5.0;
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} else if (speed > 15.0) {
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speed = 15.0;
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}
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m_series->append(currentTime.addSecs(-i * 60).toMSecsSinceEpoch(), speed);
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previousSpeed = speed; // 更新前一个速度值
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}
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// 创建并设置X轴为日期时间轴
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QDateTimeAxis* xAxis = new QDateTimeAxis();
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xAxis->setFormat("hh:mm:ss");
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xAxis->setRange(currentTime.addSecs(-7200), currentTime); // 设置范围为最近两个小时
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xAxis->setLinePen(QPen(Qt::gray));
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xAxis->setLabelsColor(Qt::gray);
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m_chart->setAxisX(xAxis, m_series); // 将X轴应用到数据系列
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// 设置Y轴范围
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m_chart->axisY()->setRange(0, 20);
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m_chart->axisY()->setTitleText("速度 (m/s)");
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m_chart->axisY()->setTitleBrush(QBrush(Qt::gray));
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m_chart->axisY()->setLinePen(QPen(Qt::gray));
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m_chart->axisY()->setLabelsColor(Qt::gray);
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// 设置图表到视图并将视图设置为中心部件
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m_chartView->setChart(m_chart);
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QVBoxLayout* layout = new QVBoxLayout(this);
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layout->setContentsMargins(0, 0, 0, 0);
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layout->setSpacing(0); // 设置间距为0
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layout->addWidget(m_chartView);
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setLayout(layout);
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}
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