QT实现的一个雷达仿真自定义控件

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雷达扫描图，在影视作品中见到较多，比如飞机雷达、舰艇雷达，有一个扫描线转圈代表雷达一周旋转或一个批次的收发，发现目标就在表盘上标记位置。和仪表盘类似，仪表盘有底盘背景图、同圆、刻度、刻度值、旋转的指针。在仪表盘的基础上略作修改，比如指针换成带有余辉的扫描扇面，就能完成一个雷达扫描图

#include "Radar.h" #include #include #include Radar::Radar(QWidget *parent) : QWidget(parent) { timer = new QTimer(); // 目标点默认半径为5 cir_size = 5; flag = false; // 监听窗口大小变化的事件 installEventFilter(this); // 默认扫描波束宽度为圆周，即360度 pBeamWidth = 360; ScaleFactor = 1; ScanRate = 1; // 默认目标点颜色为蓝色 r = 0; g = 0; b = 255; //强制设置背景颜色为黑色 setPalette(Qt::black); setAutoFillBackground(true); //用槽函数控制雷达扫描效果。 connect(timer,&QTimer::timeout,this,&Radar::timerTimeOut); Init(); SetShowTrack(true); SetScanParams(); } Radar::~Radar() { } void Radar::Start(int nScanPeriod) { timer->start(nScanPeriod); } void Radar::Stop() { flag = false; timer->stop(); } void Radar::Init(int nMaxDetectionDistance, int nEqualParts, int nScanPeriod, int nBeamWidth, bool bShowTrack) { this->pRadius = nMaxDetectionDistance; this->pNumTurns = nEqualParts; this->pScanPeriod = nScanPeriod; this->pBeamWidth = nBeamWidth; this->pShowTrack = bShowTrack; } void Radar::SetShowTrack(bool bShowTrack) { this->pShowTrack = bShowTrack; } void Radar::SetScanPeriod(int nScanPeriod) { timer->stop(); this->pScanPeriod = nScanPeriod; timer->start(nScanPeriod); } void Radar::SetScanParams(ScanDirectionEnum scanDirection, ScanModeEnum scanMode, int nBeamWidth, int nStartAngle, int nEndAngle) { timer->stop(); this->pScanDirection = scanDirection; this->pScanMode = scanMode; this->pBeamWidth = nBeamWidth; this->pStartAngle = nStartAngle; this->pEndAngle = nEndAngle; _start = pStartAngle; _end = pEndAngle - pBeamWidth; timer->start(pScanPeriod); } void Radar::SetData(TargetInfo ti) { this->pTargetInfo = ti; } void Radar::SetData(std::vector &ti) { this->pTargetInfos = ti; } void Radar::SetColor(int r, int g, int b) { this->r = r; this->g = g; this->b = b; } void Radar::timerTimeOut() { if(pScanMode == CircleScan) { if(pScanDirection == ClockWize) { if(!flag) { pStartAngle = 90; flag = true; } pBeamWidth = 360; //每次旋转ScanRate度 pStartAngle -= ScanRate; if(pStartAngle <= -360) { pStartAngle = 0; } } else { if(!flag) { pStartAngle = 90; flag = true; } pBeamWidth = 360; //每次旋转ScanRate度 pStartAngle += ScanRate; if(pStartAngle >= 360) { pStartAngle = 0; } } } else if(pScanMode == SectorScan) { //每次旋转ScanRate度 pStartAngle -= ScanRate; if(pStartAngle < _start || pStartAngle > _end) { ScanRate *= -1; } } update(); } void Radar::paintEvent(QPaintEvent *event)//此函数自动执行，实现扫描动画效果 { Q_UNUSED(event); QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.setPen(QPen(qRgba(128, 255, 0,250))); // 圆心 CoorX = this->width() / 2; CoorY = this->height() / 2; // 获取窗口的宽度和高度 int width = this->width(); int height = this->height(); // 计算最小边长 minSide = qMin(width, height) - 50; // 求量程 int range = pRadius / pNumTurns; MeasureRadius = minSide / 2; int range1 = MeasureRadius / pNumTurns; // 从外到内画圆 QPoint center(CoorX,CoorY); for(int i = 0;i < pNumTurns;i++) { painter.drawEllipse(center, ScaleFactor * (MeasureRadius - range1 * i), ScaleFactor * (MeasureRadius - range1 * i)); } // 画量程 drawRange(&painter, CoorX, CoorY, range, range1); /** 画外圈刻度值，将坐标系移动到圆心 **/ painter.translate(CoorX, CoorY); 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, ScaleFactor * (MeasureRadius * -1), 0, ScaleFactor * (MeasureRadius * -1 + 5)); } for(int i=1;i<=72;i++){ painter.rotate(5); painter.drawLine(0, ScaleFactor * (MeasureRadius * -1), 0, ScaleFactor * (MeasureRadius * -1 + 8)); } for(int i=1;i<=36;i++){ painter.setRenderHint(QPainter::Antialiasing); painter.rotate(10); painter.drawLine(0, ScaleFactor * (MeasureRadius * -1),0, ScaleFactor * (MeasureRadius * -1 + 12)); } for(int i = 1;i <= 4;i++){ // 外圈刻度值 painter.drawLine(0, 0, 0, ScaleFactor * (MeasureRadius * -1)); // 绘制方位 drawAzimuth(&painter, -10, ScaleFactor * (MeasureRadius * -1 - 10), (i - 1) * 90); // 顺时针旋转90度 painter.rotate(90); } painter.translate(-CoorX,-CoorY);//恢复坐标系 painter.setPen(QPen(Qt::NoPen));//去掉外框线 // 圆周扫描 if(pScanMode == CircleScan) { /** 绘制扫描效果 **/ if(pScanDirection == ClockWize) { QConicalGradient gradient(CoorX, CoorY, pStartAngle); gradient.setColorAt(0.1, QColor(128, 255, 0, 150)); gradient.setColorAt(0.9, QColor(0, 255, 0, 0));//尾部 painter.setBrush(gradient); } else if(pScanDirection == AntiClockWize) { QConicalGradient gradient(CoorX, CoorY, pStartAngle); gradient.setColorAt(0.9, QColor(128, 255, 0, 150)); gradient.setColorAt(0.1, QColor(0, 255, 0, 0));//尾部 painter.setBrush(gradient); } painter.drawPie(CoorX-ScaleFactor * MeasureRadius, CoorY-ScaleFactor * MeasureRadius, ScaleFactor * MeasureRadius * 2, ScaleFactor * MeasureRadius * 2, -pStartAngle * 16, pBeamWidth * 16); }// 扇形扫描 else if(pScanMode == SectorScan) { painter.setBrush(QBrush(QColor(128, 255, 0, 150))); painter.save(); QTransform transform; transform.translate(CoorX, CoorY); // 平移原点位置 painter.setTransform(transform); // 应用变换矩阵 painter.rotate(-90); painter.drawPie(-ScaleFactor * MeasureRadius, -ScaleFactor * MeasureRadius, ScaleFactor * MeasureRadius * 2, ScaleFactor * MeasureRadius * 2, -pStartAngle * 16, -pBeamWidth * 16); painter.restore(); } //模拟画出可疑点 painter.translate(CoorX, CoorY); painter.setBrush(QBrush(QColor(50, 255, 200, 200))); if(pTargetInfo.sTargetId.size() != 0) { drawTarget(&painter, pTargetInfo); } // 绘制多点坐标数据 for(auto target : pTargetInfos) { drawTarget(&painter, target); } } void Radar::resizeEvent(QResizeEvent *event) { // 窗口大小改变时重新绘制 Q_UNUSED(event); update(); } void Radar::wheelEvent(QWheelEvent *event) { int angleDelta = event->angleDelta().y(); qreal scaleFactorDelta = 1; if (angleDelta > 0) { // 滚轮向前滚动，放大图形 ScaleFactor += scaleFactorDelta; } else { // 滚轮向后滚动，缩小图形 ScaleFactor -= scaleFactorDelta; } // 限制放大缩小比例的范围 if (ScaleFactor < 1) { ScaleFactor = 1; } else if (ScaleFactor > 5) { ScaleFactor = 5; } // 更新小部件进行重绘 update(); } void Radar::drawAzimuth(QPainter *painter, int x, int y, int azimuth) { if(azimuth == 180) {

资源文件列表:

radarDemo.zip 大约有5个文件

radarDemo/
radarDemo/main.cpp 2.01KB
radarDemo/QRadar.pro 1016B
radarDemo/Radar.cpp 11.6KB
radarDemo/Radar.h 7.76KB