Qt-Qt之雷达扫描效果-No25-QtRadar

相关资料：

https://blog.csdn.net/weixin_43865793/article/details/127684665    原作者

实例代码：

.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    mainwindow.cpp \
    scan.cpp

HEADERS += \
    mainwindow.h \
    scan.h

FORMS += \
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

 main.cpp

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

 mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

#include "scan.h"

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    Scan *m_pScan;
};
#endif // MAINWINDOW_H

 mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    setWindowTitle(QStringLiteral("Qt之雷达扫描效果"));

    m_pScan = new Scan(this);
    m_pScan->setGeometry(0,0,600,600);
}

MainWindow::~MainWindow()
{
    delete ui;
}

 mainwindow.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>600</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget"/>
 </widget>
 <resources/>
 <connections/>
</ui>

 scan.h

#ifndef SCAN_H
#define SCAN_H

#include <QWidget>
#include <QPainter>
#include <QTime>
#include <QTimer>
#include <QDebug>
#include <QPoint>
#include <QtMath>

class Scan : public QWidget
{
    Q_OBJECT
public:
    explicit Scan(QWidget *parent = nullptr);
    ~Scan();
public slots:
   void timerTimeOut();
protected:
   void paintEvent(QPaintEvent *event) override;
private slots:
   void on_pushButton_clicked();
private:

};

#endif // SCAN_H

 scan.cpp

#include "scan.h"

QTimer *timer = new QTimer();
int m_angle=0;
int alpha=0;
double cir_size=5;

Scan::Scan(QWidget *parent) :
    QWidget(parent)
{
    setPalette(Qt::black);
    setAutoFillBackground(true);//强制设置背景颜色为黑色
    connect(timer,SIGNAL(timeout()),this,SLOT(timerTimeOut()));//用槽函数控制雷达扫描效果。
    timer->start(10);
}

Scan::~Scan()
{

}

void Scan::timerTimeOut()
{
    timer->start(10);
    if(m_angle<-360){
        m_angle=0;
    }//实现无缝连接，且保证m_angle的值不会溢出
    if(alpha>=255){
        alpha = 0;
    }
    if(cir_size>10){
        cir_size=5;
    }
    update();
}

void Scan::paintEvent(QPaintEvent *event)//此函数自动执行，实现扫描动画效果
{
    Q_UNUSED(event);
    QPainter painter(this);
    QPen pen;
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setPen(QPen(qRgba(128, 255, 0,250)));

    //网格改成坐标系
    int x=280;//原本为240，右移40，下移60
    int y=300;
    /** 直径按照480处理 每隔40px画一个圆 绘制雷达图**/
    QPoint center(x,y);
    painter.drawEllipse(center,240,240);
    painter.drawEllipse(center,240-48,240-48);
    painter.drawEllipse(center,240-96,240-96);
    painter.drawEllipse(center,240-144,240-144);
    painter.drawEllipse(center,240-192,240-192);
    /** 画外圈刻度值，将坐标系移动到圆心 **/
    painter.translate(x,y);
    painter.setPen(QPen(qRgba(255, 255, 0,250)));
    painter.setFont(QFont("Calibri",10));
    for(int i=1;i<=360;i++){
           painter.rotate(1);
           painter.drawLine(0,-240,0,-235);
    }
    for(int i=1;i<=72;i++){
        painter.rotate(5);
        painter.drawLine(0,-240,0,-232);
    }
    for(int i=1;i<=36;i++){
        painter.setRenderHint(QPainter::Antialiasing);
        painter.rotate(10);
        painter.drawLine(0,-240,0,-228);
    }
    for(int i=1;i<=4;i++){
        painter.rotate(90);
        painter.drawLine(0,-240,0,-168);
    }
    painter.translate(-x,-y);//恢复坐标系
   /** 绘制扫描效果 **/
    QConicalGradient gradient(x, y, m_angle + 360);
    gradient.setColorAt(0.1, QColor(128, 255, 0, 150));
    gradient.setColorAt(0.7, QColor(0, 255, 0, 0));//尾部
    painter.setBrush(gradient);
    painter.setPen(QPen(Qt::NoPen));//去掉外框线
    if (width() > height()){
        painter.drawPie(40, 60, 480, 480, m_angle * 16, 360 * 16);
    }
    else{ painter.drawPie(40, 60, 480, 480, m_angle * 16, 360 * 16);}

    m_angle -= 1;//每次旋转1度
    alpha +=2;
    cir_size+=0.01;

    //模拟画出可疑点
    painter.setBrush(QBrush(QColor(50, 255, 200,alpha)));
//    painter.drawEllipse(0,0,15,15);
    painter.drawEllipse(60+120,60+161,cir_size,cir_size);
    painter.drawEllipse(60+240,60+161,cir_size,cir_size);
    painter.drawEllipse(60+300,60+300,cir_size,cir_size);
    painter.setBrush(QBrush(QColor(50, 255, 200,(alpha+50)%255)));
    painter.drawEllipse(60+160,60+121,cir_size,cir_size);
    painter.drawEllipse(60+60,60+191,cir_size,cir_size);
    painter.drawEllipse(60+260,60+221,cir_size,cir_size);
    painter.setBrush(QBrush(QColor(50, 255, 200,(alpha+100)%255)));
    painter.drawEllipse(60+210,60+181,cir_size,cir_size);
    painter.drawEllipse(60+10,60+281,cir_size,cir_size);
    painter.drawEllipse(60+100,60+81,cir_size,cir_size);
}

void Scan::on_pushButton_clicked()
{
    m_angle=0;//将扫描动画重置并刷新数据，后面要将数据刷新的函数写在下面。
}

 

 

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