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忘记了,艹,对不起原作者了。
.pro
1 QT += core gui 2 3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets 4 5 CONFIG += c++11 6 7 # The following define makes your compiler emit warnings if you use 8 # any Qt feature that has been marked deprecated (the exact warnings 9 # depend on your compiler). Please consult the documentation of the 10 # deprecated API in order to know how to port your code away from it. 11 DEFINES += QT_DEPRECATED_WARNINGS 12 13 # You can also make your code fail to compile if it uses deprecated APIs. 14 # In order to do so, uncomment the following line. 15 # You can also select to disable deprecated APIs only up to a certain version of Qt. 16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 17 18 SOURCES += \ 19 main.cpp \ 20 mainwindow.cpp \ 21 scanneritem.cpp 22 23 HEADERS += \ 24 mainwindow.h \ 25 scanneritem.h 26 27 FORMS += \ 28 mainwindow.ui 29 30 # Default rules for deployment. 31 qnx: target.path = /tmp/$${TARGET}/bin 32 else: unix:!android: target.path = /opt/$${TARGET}/bin 33 !isEmpty(target.path): INSTALLS += targetView Code
main.cpp
1 #include "mainwindow.h" 2 3 #include <QApplication> 4 5 int main(int argc, char *argv[]) 6 { 7 QApplication a(argc, argv); 8 MainWindow w; 9 w.show(); 10 return a.exec(); 11 }View Code
mainwindow.h
1 #ifndef MAINWINDOW_H 2 #define MAINWINDOW_H 3 4 #include <QMainWindow> 5 #include "scanneritem.h" 6 7 QT_BEGIN_NAMESPACE 8 namespace Ui { class MainWindow; } 9 QT_END_NAMESPACE 10 11 class MainWindow : public QMainWindow 12 { 13 Q_OBJECT 14 15 public: 16 MainWindow(QWidget *parent = nullptr); 17 ~MainWindow(); 18 19 private: 20 Ui::MainWindow *ui; 21 }; 22 #endif // MAINWINDOW_HView Code
mainwindow.cpp
1 #include "mainwindow.h" 2 #include "ui_mainwindow.h" 3 4 MainWindow::MainWindow(QWidget *parent) 5 : QMainWindow(parent) 6 , ui(new Ui::MainWindow) 7 { 8 ui->setupUi(this); 9 10 Widget *oWidget = new Widget(this); 11 12 oWidget->setGeometry(10, 10, this->width(), this->height()); 13 } 14 15 MainWindow::~MainWindow() 16 { 17 delete ui; 18 }View Code
scanneritem.h
1 #ifndef SCANNERITEM_H 2 #define SCANNERITEM_H 3 4 #include "QWidget" 5 #include "QList" 6 #include "QTimer" 7 #include "QPainter" 8 #include "QPixmap" 9 #include "QTime" 10 #include "QDebug" 11 12 class Widget : public QWidget 13 { 14 Q_OBJECT 15 16 public: 17 explicit Widget(QWidget *parent = 0); 18 ~Widget(); 19 QPixmap paintWidget(); 20 21 protected: 22 void paintEvent(QPaintEvent *event); 23 void resizeEvent(QResizeEvent *event); 24 protected slots: 25 void timerTimeOut(); 26 27 private: 28 QTimer *timer; 29 QPoint point; 30 int i_diameter=0; 31 double d_angle=0; 32 QList<QPixmap> list_pixmap; 33 }; 34 35 #endif // SCANNERITEM_HView Code
scanneritem.cpp
1 #include "scanneritem.h" 2 3 Widget::Widget(QWidget *parent) : 4 QWidget(parent) 5 { 6 this->setStyleSheet("background-color:black");//设置窗口背景色为黑色 7 timer = new QTimer(); 8 connect(timer,SIGNAL(timeout()),this,SLOT(timerTimeOut())); 9 10 timer->start(10); 11 } 12 13 Widget::~Widget() 14 { 15 16 } 17 18 void Widget::resizeEvent(QResizeEvent *event) 19 { 20 if(this->width() > this->height()){ 21 point = QPoint((this->width()-this->height())/2+(this->height()-12)/2,this->height()/2); 22 i_diameter = this->height()-12; 23 }else{ 24 point = QPoint(this->width()/2,(this->height()-this->width())/2+(this->width()-12)/2); 25 i_diameter = this->width()-12; 26 } 27 } 28 29 QPixmap Widget::paintWidget() 30 { 31 QPixmap pixmap(this->width(),this->height()); 32 QPainter p_painter(&pixmap); 33 QPen pen; 34 QTime timedebug; 35 timedebug.start(); 36 //反锯齿 37 p_painter.setRenderHint(QPainter::Antialiasing); 38 pixmap.fill(Qt::black); 39 40 pen.setColor(Qt::green); 41 p_painter.setPen(pen); 42 43 pen.setColor(Qt::gray); 44 p_painter.setPen(pen); 45 p_painter.drawLine(point.x(),point.y()-i_diameter/2-10,point.x(),point.y()+i_diameter/2+10);//画坐标 46 p_painter.drawLine(point.x()-i_diameter/2-10,point.y(),point.x()+i_diameter/2+10,point.y()); 47 pen.setColor(Qt::green); 48 p_painter.setPen(pen); 49 for(int i=0; i<6; i++){ 50 p_painter.drawEllipse(point.x()-i_diameter*0.2*i/2,point.y()-i_diameter*0.2*i/2,i_diameter*0.2*i,i_diameter*0.2*i); 51 } 52 53 QConicalGradient conical_gradient(point,(6.28-d_angle)/6.28*720);//定义圆心和渐变的角度 54 conical_gradient.setColorAt(0,Qt::green); 55 conical_gradient.setColorAt(0.2,QColor(255,255,255,0)); 56 p_painter.setBrush(conical_gradient); 57 p_painter.drawEllipse(point.x()-i_diameter/2,point.y()-i_diameter/2,i_diameter,i_diameter); 58 59 60 qDebug()<<"time_end="<<timedebug.elapsed()<<"ms"; 61 62 return pixmap; 63 64 } 65 66 void Widget::timerTimeOut() 67 { 68 timer->start(10); 69 d_angle += 3.14/720; 70 if(d_angle >= 6.28){ 71 d_angle = 0; 72 } 73 update(); 74 75 } 76 77 void Widget::paintEvent(QPaintEvent *event) 78 { 79 QPainter p_painter(this); 80 //反锯齿 81 p_painter.setRenderHint(QPainter::Antialiasing, true); 82 83 p_painter.drawPixmap(0,0,this->width(),this->height(),paintWidget()); 84 85 QWidget::paintEvent(event); 86 }View Code