qt6用cmake和qchart绘制动态波形图

以下是使用CMake和QChart绘制动态波形图的基本步骤：

1. 创建一个CMake项目，并添加Qt6库和QChart库的依赖项。

cmake_minimum_required(VERSION 3.5)

project(QChartDemo)

set(CMAKE_CXX_STANDARD 11)

find_package(Qt6 COMPONENTS Core Gui Widgets Charts REQUIRED)

add_executable(QChartDemo main.cpp)

target_link_libraries(QChartDemo PRIVATE Qt6::Core Qt6::Gui Qt6::Widgets Qt6::Charts)

2. 在代码中，创建一个QChart对象和一个QChartView对象，并将其添加到QWidget中。

#include <QtCharts>

QT_CHARTS_USE_NAMESPACE

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QChart *chart = new QChart();
    chart->setTitle("Dynamic Chart");

    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    QWidget widget;
    QVBoxLayout *layout = new QVBoxLayout(&widget);
    layout->addWidget(chartView);
    widget.show();

    return a.exec();
}

3. 创建一个QLineSeries对象来表示波形图的数据，并将其添加到QChart对象中。

QLineSeries *series = new QLineSeries();
chart->addSeries(series);

// Add some data
series->append(0, 0);
series->append(1, 1);
series->append(2, 2);
series->append(3, 3);

4. 使用QTimer对象来更新波形图的数据，并在每个更新周期中重新绘制波形图。

QTimer *timer = new QTimer();
QObject::connect(timer, &QTimer::timeout, [&](){
    static int x = 0;
    series->append(x, qrand() % 100);
    x++;
    chart->scroll(1, 0);
    chartView->update();
});

timer->start(1000);

5. 运行程序并查看动态波形图。

完整的示例代码：

#include <QtWidgets>
#include <QtCharts>

QT_CHARTS_USE_NAMESPACE

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QChart *chart = new QChart();
    chart->setTitle("Dynamic Chart");

    QLineSeries *series = new QLineSeries();
    chart->addSeries(series);

    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    QWidget widget;
    QVBoxLayout *layout = new QVBoxLayout(&widget);
    layout->addWidget(chartView);
    widget.show();

    QTimer *timer = new QTimer();
    QObject::connect(timer, &QTimer::timeout, [&](){
        static int x = 0;
        series->append(x, qrand() % 100);
        x++;
        chart->scroll(1, 0);
        chartView->update();
    });

    timer->start(1000);

    return a.exec();
}