如何用QT 写一个将输入的数据输出成折线图的代码
时间: 2024-02-25 13:51:46 浏览: 119
你可以使用QT自带的Qt Charts库来绘制折线图。下面是一个简单的例子:
1. 在.pro文件中添加`QT += charts`,并重新编译项目。
2. 在需要显示折线图的窗口添加一个QChartView控件。例如,在MainWindow类的构造函数中添加以下代码:
```cpp
QChartView *chartView = new QChartView(this);
setCentralWidget(chartView);
```
3. 创建一个QLineSeries对象,并添加数据。例如:
```cpp
QLineSeries *series = new QLineSeries();
series->append(0, 6);
series->append(2, 4);
series->append(3, 8);
series->append(7, 4);
series->append(10, 5);
```
4. 创建一个QChart对象,并将QLineSeries添加到图表中。例如:
```cpp
QChart *chart = new QChart();
chart->addSeries(series);
```
5. 设置图表的标题和坐标轴标签。例如:
```cpp
chart->setTitle("Line Chart Example");
chart->setAxisX(new QValueAxis(), series);
chart->setAxisY(new QValueAxis(), series);
chart->axisX()->setTitleText("X Axis");
chart->axisY()->setTitleText("Y Axis");
```
6. 将图表设置为QChartView的视图对象。例如:
```cpp
chartView->setChart(chart);
```
完整的示例代码如下:
```cpp
#include <QtWidgets/QMainWindow>
#include <QtCharts/QChartView>
#include <QtCharts/QLineSeries>
#include <QtCharts/QValueAxis>
QT_CHARTS_USE_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr)
: QMainWindow(parent)
{
// 创建折线图
QLineSeries *series = new QLineSeries();
series->append(0, 6);
series->append(2, 4);
series->append(3, 8);
series->append(7, 4);
series->append(10, 5);
QChart *chart = new QChart();
chart->addSeries(series);
chart->setTitle("Line Chart Example");
chart->setAxisX(new QValueAxis(), series);
chart->setAxisY(new QValueAxis(), series);
chart->axisX()->setTitleText("X Axis");
chart->axisY()->setTitleText("Y Axis");
// 显示折线图
QChartView *chartView = new QChartView(this);
chartView->setChart(chart);
setCentralWidget(chartView);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
```
这个示例代码可以在主窗口中显示一个简单的折线图。你可以根据自己的需要修改数据和图表属性。
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