1.c++11提供的random实现了随机数库，它通过随机数引擎类（random_number_engines)产生随机数序列，随机数分布类（random-number distribution)使用随机数引擎生成服从特定概率分布的随机数。
#include <iostream> #include <random> std::default_random_engine e; std::uniform_real_distribution<double> random(0,1); void SerialPortWidget::slotTest() { qDebug()<<"r:"<<random(e)<<"i:"<<int(random(e)*255); //QColor color=QColorDialog::getColor(Qt::red,this,"选择颜色"); btnTest->setStyleSheet("background-color:rgb("+QString::number(int(random(e)*255))+"," +QString::number(int(random(e)*255))+"," +QString::number(int(random(e)*255))+");"); }
private: std::default_random_engine randomEngine; std::uniform_real_distribution<double> randomNum; OperationWidget::OperationWidget(QWidget *parent) : QWidget(parent), randomNum(0,1) { this->setMaximumWidth(400); initUI(); } QColor OperationWidget::getRandomColor() { QColor c=QColor(int(randomNum(randomEngine)*255),int(randomNum(randomEngine)*255), int(randomNum(randomEngine)*255)); return c; }
原文：https://www.cnblogs.com/ike_li/p/12100329.html