Qcustomplot的setName

QCustomPlot 是一个用于绘制图表的 C++ 库。setName 是 QCPAbstractPlottable 类的一个成员函数，用于设置该可绘制对象的名称。在 QCustomPlot 中，可绘制对象可以是曲线、柱形图、等高线图等等。

该函数的声明如下：

virtual void setName(const QString &name)

其中，name 参数是一个 QString 类型的参数，代表要设置的名称。例如，下面的代码设置曲线对象的名称为“Sine Curve”：

QCustomPlot *customPlot = new QCustomPlot;
QCPGraph *sineCurve = customPlot->addGraph();
sineCurve->setData(x, y);
sineCurve->setName("Sine Curve");

这样，在图表中就会显示出一个名称为“Sine Curve”的曲线。你还可以使用 QCPAbstractPlottable 类的 name() 函数获取对象的名称。

相关问题

pyqt QCustomPlot

QCustomPlot is a C++ library for creating 2D plots and graphs. PyQt is a Python binding for the Qt application framework, which includes the Qt GUI library that QCustomPlot is built on.

To use QCustomPlot with PyQt, you need to install PyQt and the QCustomPlot library. Once you have done that, you can create a QCustomPlot widget in your PyQt application and use its methods to create and customize plots.

Here is an example of how to create a simple plot using QCustomPlot and PyQt:

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from qcustomplot import QCustomPlot, QCPGraphData, QCPScatterStyle

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("QCustomPlot Example")
        self.setGeometry(100, 100, 800, 600)

        self.plot = QCustomPlot(self)
        self.plot.setGeometry(50, 50, 700, 500)

        self.plot.addGraph()
        self.plot.graph(0).setLineStyle(QCPGraphData.lsNone)
        self.plot.graph(0).setScatterStyle(QCPScatterStyle(QCPScatterStyle.ssCircle, 5))
        self.plot.graph(0).setData([0, 1, 2, 3, 4], [1, 2, 3, 2, 1])

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

In this example, we create a MainWindow class that inherits from QMainWindow. We create a QCustomPlot widget and add it to the main window. We then add a graph to the plot and set its line style to none and its scatter style to a circle with a size of 5. We set the data for the graph using two arrays of x and y values.

When we run the application, we see a simple plot with five points. We can customize the plot further by using more of QCustomPlot's methods and properties.

plot->graph()->setName(expression);这个代码有什么用

这段代码是用于设置图表中曲线的名称。具体来说，它的作用是：

1. `plot`是一个QCustomPlot对象，表示图表中的绘图区域；

2. `graph()`是QCustomPlot对象的函数，返回当前绘图区域中最后一个添加的曲线对象；

3. `setName(expression)`是QCPGraph对象的函数，用于设置曲线的名称，其中`expression`表示曲线的名称字符串。

综上所述，这段代码的作用是为当前绘图区域中最后一个添加的曲线对象设置名称为`expression`。这样，在图表中就可以方便地识别出每条曲线所代表的数据。