Qt画圆可以代替指示灯

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); } MainWindow::~MainWindow() { delete ui; } void MainWindow:: paintEvent(QPaintEvent*) { QPainterPath path1,path2; QPainter painter1(this); QPainter painter2(this); path1.addEllipse(35,90,20,20); path2.addEllipse(90,90,20,20); // painter1.setPen(QPen(Qt::blue,4)); // painter2.setPen(QPen(Qt::black,0)); QPen pen; pen.setWidth(-1); painter1.setPen(pen); painter2.setPen(pen); painter1.setBrush(Qt::green); painter2.setBrush(Qt::green); painter1.drawPath(path1); painter2.drawPath(path2); }