Question

我需要在测试程序期间创建一系列绘图。我想为此目的使用QCustomPlot，但是我有一个问题。为了在文件中创建和保存情节，我必须创建QApplication，在需要从QMainWindow重新实现我的类之后，然后，我可以在函数中使用QCustomPlot创建所有需要的图并将其保存到文件中。是否可以避免创建QApplication实例或QMainWindow实例，或者同时创建它们两者？

请参见下面的函数代码：

void MainWindow::print_image(std::vector<double> az, std::vector<double> el, std::vector<double> za, char *image_path){

QVector<double> azFunct;// =// QVector<double>::fromStdVector(az);
QVector<double> elFunct;// =// QVector<double>::fromStdVector(el);
QVector<double> zFunct = QVector<double>::fromStdVector(za);
QVector<double> xAxisValue(az.size());

//Filling axes of x with values
std::iota(xAxisValue.begin(),xAxisValue.end(),0);

QCustomPlot customPlot;

customPlot.setLocale(QLocale(QLocale::English, QLocale::UnitedKingdom)); // period as decimal separator and comma as thousand separator
customPlot.legend->setVisible(true);
QFont legendFont = font();  // start out with MainWindow's font..
legendFont.setPointSize(9); // and make a bit smaller for legend
customPlot.legend->setFont(legendFont);
customPlot.legend->setBrush(QBrush(QColor(255,255,255,230)));
// by default, the legend is in the inset layout of the main axis rect. So this is how we access it to change legend placement:
customPlot.axisRect()->insetLayout()->setInsetAlignment(0, Qt::AlignTop|Qt::AlignRight);

//Adding new graph for displaying, all on the same plot.
customPlot.addGraph(customPlot.yAxis, customPlot.xAxis);
customPlot.graph(0)->setPen(QPen(QColor(255, 100, 0)));
customPlot.graph(0)->setName("Azimuth function");

//Adding new graph for displaying, all on the same plot.
customPlot.addGraph();
customPlot.graph(1)->setPen(QPen(Qt::red));
customPlot.graph(1)->setName("Elevation function");

//Adding new graph for displaying, all on the same plot.
customPlot.addGraph();
customPlot.graph(2)->setPen(QPen(Qt::green));
customPlot.graph(2)->setName("Z-axis function");


for(int i = 0; i < az.size(); ++i){
    azFunct[i] = sin(az[i]*M_PI/180);
    elFunct[i] = cos(el[i]*M_PI/180);
}

double minZ = *std::min_element(zFunct.constBegin(), zFunct.constEnd());
double maxZ = *std::max_element(zFunct.constBegin(), zFunct.constEnd());

// pass data points to graphs:
customPlot.graph(0)->setData(xAxisValue, azFunct);
customPlot.graph(1)->setData(xAxisValue, elFunct);
customPlot.graph(2)->setData(xAxisValue,zFunct);

customPlot.xAxis->setVisible(true);
customPlot.xAxis->setTickLabels(false);
customPlot.xAxis2->setVisible(true);
customPlot.xAxis2->setTickLabels(false);
customPlot.yAxis2->setVisible(true);
// set ranges appropriate to show data:
customPlot.yAxis->setRange(-1, 1);
customPlot.yAxis2->setRange(minZ, maxZ);

customPlot.plotLayout()->insertRow(0);
//customPlot.plotLayout()->addElement(0, 0, new QCPTextElement(customPlot, "Z axis", QFont("sans", 12, QFont::Bold)));

// set labels:
customPlot.yAxis->setLabel("sin/cos value");
customPlot.yAxis2->setLabel("Z - axis");
//Under big question have to be tested!
customPlot.replot();
customPlot.savePng(QString(image_path),1500,500,1);}

Answer 1

当然，您不需要QMainWindow，可以单独实例化QCustomPlot实例，而不能作为任何其他子部件的实例。此外，您无需显示该小部件即可进行绘制。因此，即使实例化QApplication，测试也可以是非交互式的。

当然，QCustomPlot的设计已损坏；不需要是QWidget。只有特定的视图视图才需要是小部件。但这是另一个故事。

是否可以在单元测试中使用QCustomPlot？

1 个答案: