QChart的使用

最新推荐文章于 2025-06-23 18:41:05 发布

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最新推荐文章于 2025-06-23 18:41:05 发布

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分类专栏： QT控件插件大全文章标签： qt

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本文介绍如何使用QT库创建温度和湿度的动态曲线图表。通过初始化系列数据、设置坐标轴范围及时间间隔，实现了两组节点（node1和node2）的温度与湿度变化趋势的可视化展示。

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首先，h文件中定义，温度和湿度的所需变量

    QSplineSeries*temperature_node1_series;

    QSplineSeries*temperature_node2_series;

    QSplineSeries*humidity_node1_series;

    QSplineSeries*humidity_node2_series;

    QChartView*temperature_chartView;

    QChartView*humidity_chartView;

在添加一个初始化的函数

    void initSeries(QDateTime from, QDateTime to);

。cpp文件中

void initwidget::initSeries(QDateTime from,QDateTime to)
{
    //温度线
    this->temperature_node1_series=new QSplineSeries(this);//
    this->temperature_node1_series->setName("node1");//图例
    this->humidity_node1_series=new QSplineSeries(this);
    this->humidity_node1_series->setName("node1");
    //湿度线
    this->temperature_node2_series=new QSplineSeries(this);
    this->temperature_node2_series->setName("node2");
    this->humidity_node2_series=new QSplineSeries(this);
    this->humidity_node2_series->setName("node2");
    //QChart波形图类
    QChart*chart_temperature=new QChart();//
    chart_temperature->setTitle("温度曲线");
    chart_temperature->addSeries(this->temperature_node1_series);//添加
    chart_temperature->addSeries(this->temperature_node2_series);//添加
    //Y轴操作，设置范围
    QValueAxis *temperature_YAxis=new QValueAxis(this);
    temperature_YAxis->setRange(25,35);//设置范围
    //X轴操作，设置时间
    QDateTimeAxis *temperature_XAxis=new QDateTimeAxis(this);
    temperature_XAxis->setRange(from,to);
    //添加到QChart中
    chart_temperature->addAxis(temperature_YAxis,Qt::AlignLeft);
    chart_temperature->addAxis(temperature_XAxis,Qt::AlignBottom);
    //添加显示线
    this->temperature_node1_series->attachAxis(temperature_YAxis);
    this->temperature_node1_series->attachAxis(temperature_XAxis);
    this->temperature_node2_series->attachAxis(temperature_YAxis);
    this->temperature_node2_series->attachAxis(temperature_XAxis);
     //将QChart添加到可视控件中
    this->temperature_chartView->setChart(chart_temperature);

     //下面是湿度线
    QChart*chart_humidity=new QChart();
    chart_humidity->setTitle("湿度曲线");
    chart_humidity->addSeries(this->humidity_node1_series);
    chart_humidity->addSeries(this->humidity_node2_series);

    QValueAxis *humidity_YAxis=new QValueAxis(this);
    humidity_YAxis->setRange(0,100);

    QDateTimeAxis *humidity_XAxis=new QDateTimeAxis(this);
    humidity_XAxis->setRange(from,to);

    chart_humidity->addAxis(humidity_YAxis,Qt::AlignLeft);
    chart_humidity->addAxis(humidity_XAxis,Qt::AlignBottom);

    this->humidity_node1_series->attachAxis(humidity_YAxis);
    this->humidity_node1_series->attachAxis(humidity_XAxis);
    this->humidity_node2_series->attachAxis(humidity_YAxis);
    this->humidity_node2_series->attachAxis(humidity_XAxis);
    this->humidity_chartView->setChart(chart_humidity);
}