Change a graphic's symbol based on the camera's proximity to it.
Use case
When showing dense datasets, it is beneficial to reduce the detail of individual points when zooming out to avoid visual clutter and to avoid data points overlapping and obscuring each other.
How to use the sample
The sample starts looking at a plane. Zoom out from the plane to see it turn into a cone. Keeping zooming out and it will turn into a point.
How it works
Create a GraphicsOverlay object and add it to a SceneView object.
Create a DistanceCompositeSceneSymbol object.
Create DistanceCompositeSceneSymbol.Range objects specifying a Symbol and the min and max distance within which the symbol should be visible.
Add the ranges to the range collection of the distance composite scene symbol.
Create a Graphic object with the distance composite scene symbol at a location and add it to the graphics overlay.
Relevant API
DistanceCompositeSceneSymbol
DistanceCompositeSceneSymbol.Range
DistanceCompositeSceneSymbol.getRangeCollection
Tags
3D, data, graphic
Sample Code
MainActivity.java
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/* Copyright 2018 Esri
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/package com.esri.arcgisruntime.sample.distancecompositesymbol;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import android.content.res.AssetManager;
import android.graphics.Color;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.mapping.ArcGISScene;
import com.esri.arcgisruntime.mapping.ArcGISTiledElevationSource;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Surface;
import com.esri.arcgisruntime.mapping.view.Graphic;
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
import com.esri.arcgisruntime.mapping.view.LayerSceneProperties;
import com.esri.arcgisruntime.mapping.view.OrbitGeoElementCameraController;
import com.esri.arcgisruntime.mapping.view.SceneView;
import com.esri.arcgisruntime.symbology.DistanceCompositeSceneSymbol;
import com.esri.arcgisruntime.symbology.ModelSceneSymbol;
import com.esri.arcgisruntime.symbology.SceneSymbol;
import com.esri.arcgisruntime.symbology.SimpleMarkerSceneSymbol;
import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;
publicclassMainActivityextendsAppCompatActivity{
privatestaticfinal String TAG = MainActivity.class.getSimpleName();
private SceneView mSceneView;
@OverrideprotectedvoidonCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// authentication with an API key or named user is required to access basemaps and other// location services ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY);
// get plane model from assets copyFileFromAssetsToCache(getString(R.string.bristol_dae));
copyFileFromAssetsToCache(getString(R.string.bristol_png));
copyFileFromAssetsToCache(getString(R.string.logo_jpg));
mSceneView = findViewById(R.id.sceneView);
// create a scene and add a basemap to it ArcGISScene scene = new ArcGISScene(BasemapStyle.ARCGIS_IMAGERY);
mSceneView.setScene(scene);
// add base surface for elevation data Surface surface = new Surface();
surface.getElevationSources().add(new ArcGISTiledElevationSource(getString(R.string.world_elevation_service_3D)));
scene.setBaseSurface(surface);
// add a graphics overlay GraphicsOverlay graphicsOverlay = new GraphicsOverlay();
graphicsOverlay.getSceneProperties().setSurfacePlacement(LayerSceneProperties.SurfacePlacement.RELATIVE);
mSceneView.getGraphicsOverlays().add(graphicsOverlay);
// set up the different symbols SimpleMarkerSymbol circleSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.RED, 10);
SimpleMarkerSceneSymbol coneSymbol = SimpleMarkerSceneSymbol.createCone(Color.RED, 3, 10);
coneSymbol.setPitch(-90);
coneSymbol.setAnchorPosition(SceneSymbol.AnchorPosition.CENTER);
String modelURI = getCacheDir() + File.separator + getString(R.string.bristol_dae);
ModelSceneSymbol modelSymbol = new ModelSceneSymbol(modelURI, 1.0);
modelSymbol.loadAsync();
// set up the distance composite symbol DistanceCompositeSceneSymbol compositeSymbol = new DistanceCompositeSceneSymbol();
compositeSymbol.getRangeCollection().add(new DistanceCompositeSceneSymbol.Range(modelSymbol, 0, 100));
compositeSymbol.getRangeCollection().add(new DistanceCompositeSceneSymbol.Range(coneSymbol, 100, 500));
compositeSymbol.getRangeCollection().add(new DistanceCompositeSceneSymbol.Range(circleSymbol, 500, 0));
// create graphic Point aircraftPosition = new Point(-2.708471, 56.096575, 5000, SpatialReferences.getWgs84());
Graphic aircraftGraphic = new Graphic(aircraftPosition, compositeSymbol);
// add graphic to graphics overlay graphicsOverlay.getGraphics().add(aircraftGraphic);
// add an orbit camera controller to lock the camera to the graphic OrbitGeoElementCameraController cameraController = new OrbitGeoElementCameraController(aircraftGraphic, 20);
cameraController.setCameraPitchOffset(80);
cameraController.setCameraHeadingOffset(-30);
mSceneView.setCameraController(cameraController);
}
@OverrideprotectedvoidonPause(){
mSceneView.pause();
super.onPause();
}
@OverrideprotectedvoidonResume(){
super.onResume();
mSceneView.resume();
}
@OverrideprotectedvoidonDestroy(){
mSceneView.dispose();
super.onDestroy();
}
/**
* Copy the given file from the app's assets folder to the app's cache directory.
*
* @param fileName as String
*/privatevoidcopyFileFromAssetsToCache(String fileName){
AssetManager assetManager = getApplicationContext().getAssets();
File file = new File(getCacheDir() + File.separator + fileName);
if (!file.exists()) {
try {
InputStream in = assetManager.open(fileName);
OutputStream out = new FileOutputStream(getCacheDir() + File.separator + fileName);
byte[] buffer = newbyte[1024];
int read = in.read(buffer);
while (read != -1) {
out.write(buffer, 0, read);
read = in.read(buffer);
}
Log.i(TAG, fileName + " copied to cache.");
} catch (Exception e) {
Log.e(TAG, "Error writing " + fileName + " to cache. " + e.getMessage());
}
} else {
Log.i(TAG, fileName + " already in cache.");
}
}
}