Dictionary renderer with graphics overlay

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
/*
 * 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);
  }
}