osgearth2.10实现雷达P显扫描的C++类代码，能设定经纬度位置、半径、填充颜色、起始终止角度和目标点位，具备自动扫描显示功能

以下是一个基于osgEarth 2.10实现雷达P显扫描的C++类代码的示例：

#include <osgEarth/MapNode>
#include <osgEarthUtil/Controls>
#include <osgEarthUtil/Ephemeris>
#include <osgEarthUtil/RadialLineOfSightNode>
#include <osgEarthUtil/RadialLineOfSightCallback>

using namespace osgEarth;
using namespace osgEarth::Util;
using namespace osgEarth::Util::Controls;

class RadarScanVisualization : public osg::Group
{
public:
    RadarScanVisualization(MapNode* mapNode, const GeoPoint& center, double radius,
                           const osg::Vec4& fillColor, double startAngle, double endAngle,
                           const GeoPoint& targetPoint)
        : mapNode_(mapNode), center_(center), radius_(radius), fillColor_(fillColor),
          startAngle_(startAngle), endAngle_(endAngle), targetPoint_(targetPoint)
    {
        createRadarScan();
    }

    void createRadarScan()
    {
        // 创建扫描区域的几何体
        Geometry* geom = new Geometry();
        geom->push_back(new Ring(center_, Distance(radius_, Units::METERS)));
        Style style;
        style.getOrCreate<LineSymbol>()->stroke()->color() = fillColor_;
        style.getOrCreate<AltitudeSymbol>()->clamping() = AltitudeSymbol::CLAMP_TO_TERRAIN;
        style.getOrCreate<AltitudeSymbol>()->technique() = AltitudeSymbol::TECHNIQUE_DRAPE;
        style.getOrCreate<PolygonSymbol>()->fill() = fillColor_;
        Feature* feature = new Feature(geom, mapNode_->getMapSRS(), style);

        // 创建雷达扫描节点
        RadarScanCallback* callback = new RadarScanCallback(center_, radius_,
                                                            startAngle_, endAngle_,
                                                            targetPoint_);
        RadialLineOfSightNode* radarScanNode = new RadialLineOfSightNode(mapNode_);
        radarScanNode->addCallback(callback);
        radarScanNode->addChild(feature);

        addChild(radarScanNode);
    }

private:
    MapNode* mapNode_;
    GeoPoint center_;
    double radius_;
    osg::Vec4 fillColor_;
    double startAngle_;
    double endAngle_;
    GeoPoint targetPoint_;
};

int main(int argc, char** argv)
{
    osgEarth::initialize();
    
    // 创建地图节点
    MapNode* mapNode = MapNode::load(MapOptions());
    
    // 创建RadarScanVisualization对象
    GeoPoint center = GeoPoint(mapNode->getMapSRS(), 0, 0);
    double radius = 1000.0; // 以米为单位
    osg::Vec4 fillColor(1.0f, 0.0f, 0.0f, 0.5f); // RGBA颜色值
    double startAngle = 0.0; // 起始角度（以度为单位）
    double endAngle = 360.0; // 终止角度（以度为单位）
    GeoPoint targetPoint = GeoPoint(mapNode->getMapSRS(), 30, 30);
    RadarScanVisualization* radarScanVis = new RadarScanVisualization(mapNode, center, radius,
                                                                       fillColor, startAngle, endAngle,
                                                                       targetPoint);
    
    // 创建Viewer对象并运行
    osgViewer::Viewer viewer;
    viewer.setSceneData(radarScanVis);
    
    return viewer.run();
}

请注意，这只是一个示例代码，您可能需要根据您的具体需求进行适当的修改和调整。此外，您需要确保已正确安装和配置了osgEarth库以及其依赖项。