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Sample viewer app
Create graphics using a local mil2525d style file and an XML file with key/value pairs for each graphic.
Use case
Use a dictionary renderer on a graphics overlay to display more transient data, such as military messages coming through a local tactical network.
How to use the sample
Run the sample and view the military symbols on the map.
How it works
- Create a new
SymbolDictionary(specificationType, dictionaryPath)
.
- Create a new
DictionaryRenderer(symbolDictionary)
.
- Create a new
GraphicsOverlay
- Set the dictionary renderer to the graphics overlay.
- Parse through the local XML file creating a map of key/value pairs for each block of attributes.
- Create a
Graphic
for each attribute.
- Use the
_wkid
key to get the geometry's spatial reference.
- Use the
_control_points
key to get the geometry's shape.
- Add the graphic to the graphics overlay.
Relevant API
- DictionaryRenderer
- DictionarySymbolStyle
- GraphicsOverlay
visualization
Sample Code
DictionaryRendererGraphicsOverlaySample.java
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/*
* 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.samples.dictionary_renderer_graphics_overlay;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Multipoint;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.PointCollection;
import com.esri.arcgisruntime.geometry.SpatialReference;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.Graphic;
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.symbology.DictionaryRenderer;
import com.esri.arcgisruntime.symbology.DictionarySymbolStyle;
public class DictionaryRendererGraphicsOverlaySample extends Application {
private MapView mapView;
private GraphicsOverlay graphicsOverlay;
@Override
public void start(Stage stage) throws Exception {
mapView = new MapView();
StackPane appWindow = new StackPane(mapView);
Scene scene = new Scene(appWindow);
// set title, size, and add scene to stage
stage.setTitle("Dictionary Renderer Graphics Overlay Sample");
stage.setWidth(800);
stage.setHeight(700);
stage.setScene(scene);
stage.show();
// authentication with an API key or named user is required to access basemaps and other location services
String yourAPIKey = System.getProperty("apiKey");
ArcGISRuntimeEnvironment.setApiKey(yourAPIKey);
// create a map with the topographic basemap style and set it to the map view
ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
mapView.setMap(map);
graphicsOverlay = new GraphicsOverlay();
// graphics no longer show after zooming passed this scale
graphicsOverlay.setMinScale(1000000);
mapView.getGraphicsOverlays().add(graphicsOverlay);
// create symbol dictionary from style file
File stylxFile = new File(System.getProperty("data.dir"), "./samples-data/stylx/mil2525d.stylx");
DictionarySymbolStyle symbolDictionary = DictionarySymbolStyle.createFromFile(stylxFile.getAbsolutePath());
// tells graphics overlay how to render graphics with symbol dictionary attributes set
DictionaryRenderer renderer = new DictionaryRenderer(symbolDictionary);
graphicsOverlay.setRenderer(renderer);
// parse graphic attributes from a XML file
List<Map<String, Object>> messages = parseMessages();
// create graphics with attributes and add to graphics overlay
messages.stream()
.map(DictionaryRendererGraphicsOverlaySample::createGraphic)
.collect(Collectors.toCollection(() -> graphicsOverlay.getGraphics()));
// once view has loaded
mapView.addSpatialReferenceChangedListener(e -> {
// set initial viewpoint
mapView.setViewpointGeometryAsync(graphicsOverlay.getExtent());
});
}
/**
* Parses a XML file following the mil2525d specification and creates a message for each block of attributes found.
*/
private List<Map<String, Object>> parseMessages() throws Exception {
File mil2525dFile = new File(System.getProperty("data.dir"), "./samples-data/xml/Mil2525DMessages.xml");
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.parse(mil2525dFile);
document.getDocumentElement().normalize();
final List<Map<String, Object>> messages = new ArrayList<>();
for (int i = 0; i < document.getElementsByTagName("message").getLength() ; i++) {
Node message = document.getElementsByTagName("message").item(i);
Map<String, Object> attributes = new HashMap<>();
NodeList childNodes = message.getChildNodes();
for (int j = 0; j < childNodes.getLength() ; j++) {
attributes.put(childNodes.item(j).getNodeName(), childNodes.item(j).getTextContent());
}
messages.add(attributes);
}
return messages;
}
/**
* Creates a graphic using a symbol dictionary and the attributes that were passed.
*
* @param attributes tells symbol dictionary what symbol to apply to graphic
*/
private static Graphic createGraphic(Map<String, Object> attributes) {
// get spatial reference
int wkid = Integer.parseInt((String) attributes.get("_wkid"));
SpatialReference sr = SpatialReference.create(wkid);
// get points from coordinates' string
PointCollection points = new PointCollection(sr);
String[] coordinates = ((String) attributes.get("_control_points")).split(";");
Stream.of(coordinates)
.map(cs -> cs.split(","))
.map(c -> new Point(Double.valueOf(c[0]), Double.valueOf(c[1]), sr))
.collect(Collectors.toCollection(() -> points));
// return a graphic with multipoint geometry
return new Graphic(new Multipoint(points), attributes);
}
/**
* Stops and releases all resources used in application.
*/
@Override
public void stop() {
if (mapView != null) {
mapView.dispose();
}
}
/**
* Opens and runs application.
*
* @param args arguments passed to this application
*/
public static void main(String[] args) {
Application.launch(args);
}
}