Extrude features based on their attributes.
Use case
Extrusion is the process of stretching a flat, 2D shape vertically to create a 3D object in a scene. For example, you can extrude building polygons by a height value to create three-dimensional building shapes.
How to use the sample
Tap the toggle to switch between using population density and total population for extrusion. Higher extrusion directly corresponds to higher attribute values.
How it works
- Create a
ServiceFeatureTable
from a URL. - Create a feature layer from the service feature table.
- Make sure to set the rendering mode to dynamic,
statesFeatureLayer.setRenderingMode(RenderingMode.DYNAMIC)
.
- Make sure to set the rendering mode to dynamic,
- Apply a
SimpleRenderer
to the feature layer. - Set the
ExtrusionMode
of the renderer withrenderer.getSceneProperties().setExtrusionMode(SceneProperties.ExtrusionMode.ABSOLUTE_HEIGHT)
. - Set the extrusion expression of the renderer with
renderer.getSceneProperties().setExtrusionExpression("[POP2007]/ 10")
.
Relevant API
- FeatureLayer
- Renderer.SceneProperties
- ServiceFeatureTable
- SimpleRenderer
Tags
3D, extrude, extrusion, extrusion expression, height, renderer, scene
Sample Code
/* Copyright 2017 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.featurelayerextrusion;
import android.graphics.Color;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.widget.Switch;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISScene;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.Camera;
import com.esri.arcgisruntime.mapping.view.SceneView;
import com.esri.arcgisruntime.symbology.Renderer;
import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;
public class MainActivity extends AppCompatActivity {
private SceneView mSceneView;
@Override
protected void onCreate(final 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 us census data as a service feature table
ServiceFeatureTable statesServiceFeatureTable = new ServiceFeatureTable(
getResources().getString(R.string.us_census_feature_service));
// add the service feature table to a feature layer
final FeatureLayer statesFeatureLayer = new FeatureLayer(statesServiceFeatureTable);
// set the feature layer to render dynamically to allow extrusion
statesFeatureLayer.setRenderingMode(FeatureLayer.RenderingMode.DYNAMIC);
// create a scene and add it to the scene view
ArcGISScene scene = new ArcGISScene(BasemapStyle.ARCGIS_IMAGERY);
mSceneView = findViewById(R.id.sceneView);
mSceneView.setScene(scene);
// add the feature layer to the scene
scene.getOperationalLayers().add(statesFeatureLayer);
// define line and fill symbols for a simple renderer
final SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLACK, 1.0f);
final SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, Color.BLUE, lineSymbol);
final SimpleRenderer renderer = new SimpleRenderer(fillSymbol);
// set renderer extrusion mode to absolute height, which extrudes the feature to the specified z-value as flat top
renderer.getSceneProperties().setExtrusionMode(Renderer.SceneProperties.ExtrusionMode.ABSOLUTE_HEIGHT);
// set the simple renderer to the feature layer
statesFeatureLayer.setRenderer(renderer);
// define a look at point for the camera at geographical center of the continental US
final Point lookAtPoint = new Point(-10974490, 4814376, 0, SpatialReferences.getWebMercator());
// add a camera and set it to orbit the look at point
final Camera camera = new Camera(lookAtPoint, 20000000, 0, 55, 0);
mSceneView.setViewpointCamera(camera);
// set switch listener
Switch popSwitch = findViewById(R.id.populationSwitch);
popSwitch.setOnCheckedChangeListener((buttonView, isChecked) -> {
// set extrusion properties to either show total population or population density based on flag
if (isChecked) {
// multiple population density by 5000 to make data legible
renderer.getSceneProperties().setExtrusionExpression("[POP07_SQMI] * 5000 + 100000");
} else {
// divide total population by 10 to make data legible
renderer.getSceneProperties().setExtrusionExpression("[POP2007] / 10");
}
});
// set initial switch state
popSwitch.setChecked(true);
}
@Override
protected void onPause() {
super.onPause();
mSceneView.pause();
}
@Override
protected void onResume() {
super.onResume();
mSceneView.resume();
}
@Override protected void onDestroy() {
super.onDestroy();
mSceneView.dispose();
}
}