安卓智能地图开发与实施二十三：三维场景中的可视化 - ArcGIS Runtime SDK for Android（Version 100.1.0）

三维场景中的可视化


三维场景（SceneView 、ArcGISScene）中具备更多的符号化方式来传递信息，包括SimpleMarkerSceneSymbol、ModelMarkerSymbol、DistanceCompositeSceneSymbol以及空间要素拉伸。


SimpleMarkerSceneSymbol

可绘制样式：

• 立方体（ Cube ）
• 圆锥体（ Cone ）
• 圆柱体（ Cylinder ）
• 菱形体（ Diamond ）
• 球体（ Sphere ）
• 四面体（ Tetrahedron ）

宽高深设置： Width、 Height、 Depth
符号位置：anchorPosition
SceneSymbol.AnchorPosition：

• BOTTOM：几何模型在定位位置的上方
• CENTER ：几何模型在定位位置的中心
• TOP ：几何模型在定位位置的下方

SimpleMarkerSceneSymbol tetrahedron = new SimpleMarkerSceneSymbol(SimpleMarkerSceneSymbol.Style.TETRAHEDRON, 0xFFFF0000, 3000,

        3000, 3000, SceneSymbol.AnchorPosition.BOTTOM);

Point spherePoint = new Point(-4.04, 53.06, 5000);

Graphic sphereGraphic = new Graphic(spherePoint, tetrahedron);

MainGraphicsOverlay.getGraphics().add(sphereGraphic);

ModelMarkerSymbol

将三维模型（文件）直接作为符号加载
支持的格式： http://assimp.sourceforge.net/main_features_formats.html
uri：模型地址（在线或终端文件）
scale：缩放因子

ModelSceneSymbol modelSceneSymbol = new ModelSceneSymbol(

        getResources().getString(R.string.models_bristol),800);

modelSceneSymbol.loadAsync();

Point modelPoint = new Point(-4.04, 53.16, 5000);

Graphic modelGraphic = new Graphic(modelPoint, modelSceneSymbol);

MainGraphicsOverlay.getGraphics().add(modelGraphic);

DistanceCompositeSceneSymbol

根据三维场景视角镜头（camera）到空间要素的距离不同使用不同的符号（Symbol）进行可视化。

SimpleMarkerSymbol circleSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, 0xFFFF0000, 10);

DistanceCompositeSceneSymbol compositeSymbol = new DistanceCompositeSceneSymbol();

compositeSymbol.getRangeCollection().add(new DistanceCompositeSceneSymbol.Range(modelSceneSymbol, 0, 100000));

compositeSymbol.getRangeCollection().add(new DistanceCompositeSceneSymbol.Range(tetrahedron, 100000, 200000));

compositeSymbol.getRangeCollection().add(new DistanceCompositeSceneSymbol.Range(circleSymbol, 200000, 0));

Point distancePoint = new Point(-4.04, 53.16, 5000);

Graphic distanceGraphic = new Graphic(distancePoint, compositeSymbol);

MainGraphicsOverlay.getGraphics().add(distanceGraphic);

通过属性拉伸空间要素

二维图层（如FeatureLayer）添加入三维场景只能贴在场景表面，通过GraphicsOverlay添加的内容可以进行拉伸处理。

MainChinaGraphicsOverlay = new GraphicsOverlay();

MainChinaGraphicsOverlay.getSceneProperties().setSurfacePlacement(LayerSceneProperties.SurfacePlacement.RELATIVE);

MainSceneView.getGraphicsOverlays().add(MainChinaGraphicsOverlay);

SimpleFillSymbol sfs = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID,0xff00ff00,null);

SimpleRenderer renderer = new SimpleRenderer(sfs);

Renderer.SceneProperties renderProperties = renderer.getSceneProperties();

renderProperties.setExtrusionMode(Renderer.SceneProperties.ExtrusionMode.BASE_HEIGHT);

renderProperties.setExtrusionExpression("[Pop_2009] * 200");

MainChinaGraphicsOverlay.setRenderer(renderer);

final OpenLayerClass openLayerClass = new OpenLayerClass();

openLayerClass.OpenLayer(

        getResources().getString(R.string.china_polygon),

        LayerType.FILE_GEODATABASE,

        new ILayerResult() {

            @Override

            public void getLayer(ArrayList<Layer> arrayList) {

                ChinaFeatureLayer =(FeatureLayer) arrayList.get(0);

                ChinaFeatureLayer.addDoneLoadingListener(new Runnable() {

                    @Override

                    public void run() {

                        List<Field> fields = ChinaFeatureLayer.getFeatureTable().getFields();

                        for (Field field:fields

                             ) {

                            String name = field.getName();

                            String alias = field.getAlias();

                        }

                        final MapQueryClass mapQueryClass = new MapQueryClass();

                        mapQueryClass.Query(ChinaFeatureLayer, "OBJECTID > -1",

                                new IQueryResult() {

                                    @Override

                                    public void getQuery() {

                                        MapQueryClass.MapQueryResult MainMapQueryResult=

                                        mapQueryClass.getMapQueryResult().get(0);

                                        for (Feature feature:MainMapQueryResult.features

                                             ) {

                                            MainChinaGraphicsOverlay.getGraphics().add(

                                                    new Graphic(feature.getGeometry(),feature.getAttributes())

                                            );

                                        }

                                        MainSceneView.setViewpoint(

                                                new Viewpoint(ChinaFeatureLayer.getFullExtent())

                                        );

                                    }

                                });

                    }

                });

                ChinaFeatureLayer.loadAsync();



            }

        }

);

用三维来可视化特征属性

1、获取空间要素图层（FeatureLayer）
2、查询获取空间要素集
3、取得特征属性并结合SimpleMarkerSceneSymbol展示

MainChinaGraphicsOverlay = new GraphicsOverlay();

MainChinaGraphicsOverlay.getSceneProperties().setSurfacePlacement(LayerSceneProperties.SurfacePlacement.RELATIVE);

MainSceneView.getGraphicsOverlays().add(MainChinaGraphicsOverlay);

MainLabelGraphicsOverlay = new GraphicsOverlay();

MainLabelGraphicsOverlay.getSceneProperties().setSurfacePlacement(LayerSceneProperties.SurfacePlacement.RELATIVE);

MainSceneView.getGraphicsOverlays().add(MainLabelGraphicsOverlay);

MainLabelGraphicsOverlay.setMinScale(30000000d);

//renderProperties.setExtrusionExpression("[Pop_2009] * 200");

final OpenLayerClass openLayerClass = new OpenLayerClass();

openLayerClass.OpenLayer(

        getResources().getString(R.string.china_polygon),

        LayerType.FILE_GEODATABASE,

        new ILayerResult() {

            @Override

            public void getLayer(ArrayList<Layer> arrayList) {

                ChinaFeatureLayer = (FeatureLayer) arrayList.get(0);

                ChinaFeatureLayer.addDoneLoadingListener(new Runnable() {

                    @Override

                    public void run() {

                        MainSceneView.setViewpoint(

                                new Viewpoint(ChinaFeatureLayer.getFullExtent())

                        );

                        List<Field> fields = ChinaFeatureLayer.getFeatureTable().getFields();

                        for (Field field : fields

                                ) {

                            String name = field.getName();

                            String alias = field.getAlias();

                        }

                        final MapQueryClass mapQueryClass = new MapQueryClass();

                        mapQueryClass.Query(ChinaFeatureLayer, "OBJECTID > -1",

                                new IQueryResult() {

                                    @Override

                                    public void getQuery() {

                                        MapQueryClass.MapQueryResult MainMapQueryResult =

                                                mapQueryClass.getMapQueryResult().get(0);

                                        for (Feature feature : MainMapQueryResult.features

                                                ) {

                                            Point center = GeometryEngine.labelPoint((Polygon) feature.getGeometry());

                                            String field = feature.getAttributes().get("Pop_2009").toString();

                                            double count = Double.valueOf(field);

                                            if (count < 0) {

                                                count = 1;

                                            }

                                            count *= 30;

                                            SimpleMarkerSceneSymbol sphere = new SimpleMarkerSceneSymbol(

                                                    SimpleMarkerSceneSymbol.Style.SPHERE,

                                                    0xFFFBB217,

                                                    count,

                                                    count,

                                                    count, SceneSymbol.AnchorPosition.BOTTOM);

                                            MainChinaGraphicsOverlay.getGraphics().add(

                                                    new Graphic(center, sphere)

                                            );

                                            String labelStr = feature.getAttributes().get("NAME").toString() +

                                                    ": " + feature.getAttributes().get("Pop_2009").toString() + "万人";

                                            TextSymbol label = new TextSymbol(10, labelStr, 0xffEDDE8B,

                                                    TextSymbol.HorizontalAlignment.CENTER,

                                                    TextSymbol.VerticalAlignment.TOP);

                                            Point labelPoint = new Point(center.getX(), center.getY(), count, center.getSpatialReference());

                                            MainLabelGraphicsOverlay.getGraphics().add(

                                                    new Graphic(labelPoint, label)

                                            );

                                        }

                                    }

                                });



                    }

                });

                SimpleLineSymbol sls = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xff014D67, 1.0f);

                SimpleFillSymbol sfs = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, 0xff608F9F, sls);

                SimpleRenderer renderer = new SimpleRenderer(sfs);

                ChinaFeatureLayer.setRenderer(renderer);

                ChinaFeatureLayer.loadAsync();

                MainSceneView.getScene().getOperationalLayers().add(ChinaFeatureLayer);

            }

        }

);

结尾

源程序（包含飞机模型和数据）请自行下载：
链接：https://pan.baidu.com/s/1i4HTfil 密码：nwjc
若失效，可发邮件给韩源萌（polyline@126.com）索要。

文章来源：http://blog.csdn.net/allenlu2008/article/details/78667060