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标签注释、基础图元--osgearth_annotation_osgearth基础知识点 博客

osgearth基础知识点 博客
  1. 功能实现
    带注释的标签,基础图元请添加图片描述

2.代码解析

创建标牌

	//设置样式,style可以获取不同类型的样式进行设置
		Style pm;
        pm.getOrCreate<IconSymbol>()->url()->setLiteral( "../data/placemark32.png" );
        pm.getOrCreate<IconSymbol>()->declutter() = true;
        pm.getOrCreate<TextSymbol>()->halo() = Color("#5f5f5f");

        //创建标牌并设置地址与样式
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS, -74.00, 40.71), "New York"      , pm));
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS, -77.04, 38.85), "Washington, DC", pm));
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS,-118.40, 33.93), "Los Angeles"   , pm));
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS, -71.03, 42.37), "Boston"        , pm));
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS,-157.93, 21.35), "Honolulu"      , pm));
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS, 139.75, 35.68), "Tokyo"         , pm));
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS, -90.25, 29.98), "New Orleans"   , pm));
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS, -80.28, 25.82), "Miami"         , pm));
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS,-117.17, 32.72), "San Diego"     , pm));

        // 添加一个LOD节点:
        osg::LOD* lod = new osg::LOD();
        lod->addChild( new PlaceNode(GeoPoint(geoSRS, 14.68, 50.0), "Prague", pm), 0.0, 2e6);
        labelGroup->addChild( lod );

        // absolute altitude:
        labelGroup->addChild( new PlaceNode(GeoPoint(geoSRS, -87.65, 41.90, 1000, ALTMODE_ABSOLUTE), "Chicago", pm));
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代码比较简单,就是创建标牌节点并加入场景

osgearth中的画线

  		Geometry* geom = new Polygon();//输入点集
        geom->push_back( osg::Vec3d(0,   40, 0) );
        geom->push_back( osg::Vec3d(-60, 40, 0) );
        geom->push_back( osg::Vec3d(-60, 60, 0) );
        geom->push_back( osg::Vec3d(0,   60, 0) );
        Feature* feature = new Feature(geom, geoSRS);//使用大地坐标系
        feature->geoInterp() = GEOINTERP_RHUMB_LINE;//画线
        Style geomStyle;
        geomStyle.getOrCreate<LineSymbol>()->stroke()->color() = Color::Cyan;//颜色
        geomStyle.getOrCreate<LineSymbol>()->stroke()->width() = 5.0f;//宽度
        geomStyle.getOrCreate<LineSymbol>()->tessellationSize()->set(75000, Units::METERS);
        //还可以设置平滑度等
        geomStyle.getOrCreate<RenderSymbol>()->depthOffset()->enabled() = true;//是否开启深度测试

        FeatureNode* fnode = new FeatureNode(feature, geomStyle);
        annoGroup->addChild( fnode );
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点迹线

		Geometry* path = new LineString();
        path->push_back( osg::Vec3d(-74, 40.714, 0) );   // New York
        path->push_back( osg::Vec3d(139.75, 35.68, 0) ); // Tokyo

        Feature* pathFeature = new Feature(path, geoSRS);
        pathFeature->geoInterp() = GEOINTERP_GREAT_CIRCLE;//球面插值

        Style pathStyle;
        pathStyle.getOrCreate<LineSymbol>()->stroke()->color() = Color::White;
        pathStyle.getOrCreate<LineSymbol>()->stroke()->width() = 1.0f;
        pathStyle.getOrCreate<LineSymbol>()->stroke()->smooth() = true;
        pathStyle.getOrCreate<LineSymbol>()->tessellationSize()->set(75000, Units::METERS);//75000米一个点
        pathStyle.getOrCreate<PointSymbol>()->size() = 8;//点的大小
        pathStyle.getOrCreate<PointSymbol>()->fill()->color() = Color::Red;
        pathStyle.getOrCreate<PointSymbol>()->smooth() = true;
        pathStyle.getOrCreate<AltitudeSymbol>()->clamping() = AltitudeSymbol::CLAMP_TO_TERRAIN;//贴地
        pathStyle.getOrCreate<AltitudeSymbol>()->technique() = AltitudeSymbol::TECHNIQUE_GPU;
        pathStyle.getOrCreate<RenderSymbol>()->depthOffset()->enabled() = true;

        //OE_INFO << "Path extent = " << pathFeature->getExtent().toString() << std::endl;
        pathNode = new FeatureNode(pathFeature, pathStyle);
        annoGroup->addChild( pathNode );
        LabelNode* label = new LabelNode("Great circle path", labelStyle);
        label->setPosition(GeoPoint(geoSRS,-170, 61.2));
        labelGroup->addChild(label);
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画圆

 		Style circleStyle;
        circleStyle.getOrCreate<PolygonSymbol>()->fill()->color() = Color(Color::Cyan, 0.5);
        circleStyle.getOrCreate<AltitudeSymbol>()->clamping() = AltitudeSymbol::CLAMP_TO_TERRAIN;
        circleStyle.getOrCreate<AltitudeSymbol>()->technique() = AltitudeSymbol::TECHNIQUE_DRAPE;

        CircleNode* circle = new CircleNode();
        circle->set(
        GeoPoint(geoSRS, -90.25, 29.98, 1000., ALTMODE_RELATIVE),
        Distance(300, Units::KILOMETERS),
        circleStyle,
        Angle(-45.0, Units::DEGREES),
        Angle(45.0, Units::DEGREES),
        true);
        annoGroup->addChild( circle );
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加载模型

    {
        Style style;
        style.getOrCreate<ModelSymbol>()->autoScale() = true;
        style.getOrCreate<ModelSymbol>()->url()->setLiteral("../data/red_flag.osg.50.scale");
        ModelNode* modelNode = new ModelNode(mapNode, style);
        modelNode->setPosition(GeoPoint(geoSRS, -100, 52));
        annoGroup->addChild(modelNode);
    }
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加载图片

    // an image overlay.
    {
        ImageOverlay* imageOverlay = 0L;
        osg::ref_ptr<osg::Image> image = osgDB::readRefImageFile( "../data/USFLAG.TGA" );
        if (image.valid())
        {
            imageOverlay = new ImageOverlay(mapNode, image.get());
            imageOverlay->setBounds( Bounds( -100.0, 35.0, -90.0, 40.0) );
            annoGroup->addChild( imageOverlay );

            editGroup->addChild( new ImageOverlayEditor(imageOverlay) );
        }
    }
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椭圆

        Style ellipseStyle;
        ellipseStyle.getOrCreate<PolygonSymbol>()->fill()->color() = Color(Color::Orange, 0.75);
        ellipseStyle.getOrCreate<ExtrusionSymbol>()->height() = 250000.0; // meters MSL
        EllipseNode* ellipse = new EllipseNode();
        ellipse->set(
            GeoPoint(geoSRS, -80.28, 25.82, 0.0, ALTMODE_RELATIVE),
            Distance(250, Units::MILES),
            Distance(100, Units::MILES),
            Angle   (0, Units::DEGREES),
            ellipseStyle,
            Angle(45.0, Units::DEGREES),
            Angle(360.0 - 45.0, Units::DEGREES),
            true);
        annoGroup->addChild( ellipse );
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矩形

        Style rectStyle;
        rectStyle.getOrCreate<PolygonSymbol>()->fill()->color() = Color(Color::Green, 0.5);
        rectStyle.getOrCreate<AltitudeSymbol>()->clamping() = AltitudeSymbol::CLAMP_TO_TERRAIN;
        rectStyle.getOrCreate<AltitudeSymbol>()->technique() = AltitudeSymbol::TECHNIQUE_DRAPE;
        RectangleNode* rect = new RectangleNode(
            GeoPoint(geoSRS, -117.172, 32.721),
            Distance(300, Units::KILOMETERS ),
            Distance(600, Units::KILOMETERS ),
            rectStyle);
        annoGroup->addChild( rect );
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线装要素和块状要素贴地的设置是不一样的。

//线装要素使用CLAMP_TO_TERRAIN+TECHNIQUE_GPU的组合
as->clamping()  = osgEarth::AltitudeSymbol::CLAMP_TO_TERRAIN;
as->technique() = osgEarth::AltitudeSymbol::TECHNIQUE_GPU;
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面状要素使用

tStyle.getOrCreate<osgEarth::Symbology::AltitudeSymbol>()->clamping() = osgEarth::Symbology::AltitudeSymbol::CLAMP_TO_TERRAIN;
tStyle.getOrCreate<osgEarth::Symbology::AltitudeSymbol>()->technique() = osgEarth::Symbology::AltitudeSymbol
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