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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（[email protected]）索要。