Qt利用QPainter自绘实现扫描雷达功能scanneritem
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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 += target
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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 }
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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_H
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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 }
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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_H
View 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
标签：10,Widget,自绘,Qt,point,scanneritem,include,MainWindow,painter 来源： https://www.cnblogs.com/FKdelphi/p/14658715.html