qcustomplot绘制频谱图
时间: 2023-09-02 15:08:54 浏览: 297
可以使用qcustomplot库中的QCPColorMap类和QCPColorScale类来绘制频谱图。
首先定义QCustomPlot对象和QCPColorMap对象:
```cpp
QCustomPlot *customPlot = new QCustomPlot(this);
QCPColorMap *colorMap = new QCPColorMap(customPlot->xAxis, customPlot->yAxis);
```
然后设置QCPColorMap对象的数据和颜色映射:
```cpp
colorMap->setData(x, y, data);
colorMap->setGradient(QCPColorGradient::gpJet);
```
其中,x和y是频谱图的横纵坐标,data是频谱图的数据,QCPColorGradient::gpJet是颜色映射的类型,可以根据需要选择不同的颜色映射。
接着设置QCPColorMap对象的坐标范围和坐标轴标签:
```cpp
colorMap->rescaleDataRange();
customPlot->xAxis->setLabel("Frequency (Hz)");
customPlot->yAxis->setLabel("Time (s)");
customPlot->xAxis->setRange(xMin, xMax);
customPlot->yAxis->setRange(yMin, yMax);
```
其中,xMin、xMax、yMin和yMax是频谱图的坐标轴范围。
最后将QCustomPlot对象显示出来:
```cpp
customPlot->rescaleAxes();
customPlot->replot();
customPlot->show();
```
完整的代码示例:
```cpp
QCustomPlot *customPlot = new QCustomPlot(this);
QCPColorMap *colorMap = new QCPColorMap(customPlot->xAxis, customPlot->yAxis);
colorMap->setData(x, y, data);
colorMap->setGradient(QCPColorGradient::gpJet);
colorMap->rescaleDataRange();
customPlot->xAxis->setLabel("Frequency (Hz)");
customPlot->yAxis->setLabel("Time (s)");
customPlot->xAxis->setRange(xMin, xMax);
customPlot->yAxis->setRange(yMin, yMax);
customPlot->rescaleAxes();
customPlot->replot();
customPlot->show();
```
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