qt在ui端用chartview，接受单片机发来的温湿度数据并绘制折线图

好的，我可以为您解答这个问题。首先，您需要在Qt的UI界面中添加一个ChartView控件，这个控件可以用来绘制折线图。

接下来，您需要通过串口通信方式从单片机中接收到温湿度数据。您可以使用Qt的QSerialPort类来实现串口通信。

一旦您收到了温湿度数据，您可以将其存储在一个数据结构中，例如一个QVector对象。然后，您可以使用QChart类来创建一个折线图，并将数据传递给它以进行绘制。

以下是一个简单的示例代码，它演示了如何使用Qt的ChartView控件来绘制从单片机接收到的温湿度数据的折线图：

#include <QtCharts>
#include <QtSerialPort>
#include <QVector>

// Define a data structure to store temperature and humidity readings
struct Reading
{
    qreal temperature;
    qreal humidity;
};

class MyWidget : public QWidget
{
public:
    MyWidget() : QWidget()
    {
        // Create a chart and add it to a chart view
        QChart *chart = new QChart();
        QChartView *chartView = new QChartView(chart, this);
        setCentralWidget(chartView);

        // Create a series to hold the temperature data
        QLineSeries *temperatureSeries = new QLineSeries();
        temperatureSeries->setName("Temperature");
        chart->addSeries(temperatureSeries);

        // Create a series to hold the humidity data
        QLineSeries *humiditySeries = new QLineSeries();
        humiditySeries->setName("Humidity");
        chart->addSeries(humiditySeries);

        // Create the X and Y axes for the chart
        QDateTimeAxis *timeAxis = new QDateTimeAxis();
        timeAxis->setTickCount(10);
        timeAxis->setFormat("hh:mm:ss");
        chart->addAxis(timeAxis, Qt::AlignBottom);
        temperatureSeries->attachAxis(timeAxis);
        humiditySeries->attachAxis(timeAxis);

        QValueAxis *valueAxis = new QValueAxis();
        valueAxis->setLabelFormat("%.1f");
        chart->addAxis(valueAxis, Qt::AlignLeft);
        temperatureSeries->attachAxis(valueAxis);
        humiditySeries->attachAxis(valueAxis);

        // Set up the serial port to receive data from the microcontroller
        QSerialPort *serialPort = new QSerialPort(this);
        serialPort->setPortName("COM5"); // Replace with the actual port name
        serialPort->setBaudRate(9600);
        serialPort->setDataBits(QSerialPort::Data8);
        serialPort->setParity(QSerialPort::NoParity);
        serialPort->setStopBits(QSerialPort::OneStop);
        serialPort->setFlowControl(QSerialPort::NoFlowControl);

        serialPort->open(QIODevice::ReadOnly);
        connect(serialPort, &QSerialPort::readyRead, this, &MyWidget::readData);
    }

private:
    QVector<Reading> m_readings;

    void readData()
    {
        QByteArray data = serialPort->readAll();
        QString str(data);

        // Parse the temperature and humidity values from the received data
        qreal temperature = 0.0;
        qreal humidity = 0.0;

        // Code to parse the temperature and humidity values from the received data goes here

        // Add the new reading to the vector
        m_readings.append({ temperature, humidity });

        // Update the chart with the new data
        QLineSeries *temperatureSeries = chart->series()[0];
        QLineSeries *humiditySeries = chart->series()[1];

        for (int i = 0; i < m_readings.size(); ++i)
        {
            Reading reading = m_readings[i];
            temperatureSeries->append(QDateTime::currentDateTime().toMSecsSinceEpoch(), reading.temperature);
            humiditySeries->append(QDateTime::currentDateTime().toMSecsSinceEpoch(), reading.humidity);
        }
    }

    QSerialPort *serialPort;
    QChart *chart;
};

这个示例代码只是一个简单的演示，其中有一些细节需要自己实现。例如，您需要编写代码来从串口接收数据并将其解析为温湿度值。您还需要根据自己的需求调整图表的样式和布局。