KML ground overlays are used for showing aerial imagery, symbology, or other images draped over a scene. Changing the geometry, rotation, and other attributes of a ground overlay after it has been loaded allows for live editing. For example, editing the geometry and opacity of a historical image draped over present day satellite imagery makes it possible to view change over time.
How to use the sample
Use the slider to adjust the opacity of the ground overlay.
How it works
Create an Envelope defining the geometry of the overlay.
Create a KmlIcon using a URI linking to an image.
Create a KmlGroundOverlay using the envelope and icon.
Set the value of KmlGroundOverlay.setRotation().
Create a KmlDataset using the ground overlay.
Create a KmlLayer using the dataset.
Add the KML layer to the scene.
Listen for changes to the opacity slider and change the color value of the ground overlay appropriately using KmlGroundOverlay.setColor().
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
/*
* Copyright 2019 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.edit_kml_ground_overlay;
import java.io.File;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.stage.Stage;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.layers.KmlLayer;
import com.esri.arcgisruntime.mapping.ArcGISScene;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.Camera;
import com.esri.arcgisruntime.mapping.view.SceneView;
import com.esri.arcgisruntime.ogc.kml.KmlDataset;
import com.esri.arcgisruntime.ogc.kml.KmlGroundOverlay;
import com.esri.arcgisruntime.ogc.kml.KmlIcon;
publicclassEditKMLGroundOverlaySampleextendsApplication{
private SceneView sceneView;
@Overridepublicvoidstart(Stage stage){
try {
// create stack pane and application scene StackPane stackPane = new StackPane();
Scene fxScene = new Scene(stackPane);
fxScene.getStylesheets().add(getClass().getResource("/edit_kml_ground_overlay/style.css").toExternalForm());
// set title, size and add application scene to stage stage.setTitle("Edit KML Ground Overlay Sample");
stage.setWidth(800);
stage.setHeight(700);
stage.setScene(fxScene);
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 scene and add it to the scene view ArcGISScene scene = new ArcGISScene(BasemapStyle.ARCGIS_IMAGERY);
sceneView = new SceneView();
sceneView.setArcGISScene(scene);
// create a geometry for the ground overlay Envelope overlayGeometry = new Envelope(-123.066227926904, 44.04736963555683, -123.0796942287304, 44.03878298600624, SpatialReferences.getWgs84());
// create a KML icon for the overlay image String overlayImageURI = new File(System.getProperty("data.dir"), "./samples-data/images/1944.jpg").getAbsolutePath();
KmlIcon overlayImage = new KmlIcon(overlayImageURI);
// create the KML ground overlay KmlGroundOverlay kmlGroundOverlay = new KmlGroundOverlay(overlayGeometry, overlayImage);
// set the rotation of the ground overlay to correct the overlay's rotation with respect to the basemap kmlGroundOverlay.setRotation(-3.046024799346924);
// create a KML dataset with the ground overlay as the root node KmlDataset kmlDataset = new KmlDataset(kmlGroundOverlay);
// create a KML layer using the KML dataset KmlLayer kmlLayer = new KmlLayer(kmlDataset);
// add the KML layer to the scene view sceneView.getArcGISScene().getOperationalLayers().add(kmlLayer);
// set the viewpoint to the ground overlay sceneView.setViewpoint(new Viewpoint(overlayGeometry, new Camera(overlayGeometry.getCenter(), 1250, 45, 60, 0)));
// create a slider for adjusting the overlay opacity Slider slider = new Slider(0, 1, 1);
slider.setMaxWidth(300);
// add a listener to the slider's value property to set the opacity of the KML ground overlay slider.valueProperty().addListener(o ->
kmlGroundOverlay.setColor(new Color(0, 0, 0, slider.getValue()))
);
// create a controls box VBox controlsVBox = new VBox();
controlsVBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(0,0,0,0.5)"), CornerRadii.EMPTY,
Insets.EMPTY)));
controlsVBox.setPadding(new Insets(10.0));
controlsVBox.setSpacing(5);
controlsVBox.setMaxSize(250, 20);
controlsVBox.setAlignment(Pos.CENTER);
controlsVBox.getStyleClass().add("panel-region");
// create a label for the slider Label label = new Label("Overlay Opacity");
// add the slider and label to the controls box controlsVBox.getChildren().addAll(label, slider);
// add the scene view and controls to the stack pane stackPane.getChildren().addAll(sceneView, controlsVBox);
StackPane.setAlignment(controlsVBox, Pos.TOP_LEFT);
StackPane.setMargin(controlsVBox, new Insets(10, 0, 0, 10));
} catch (Exception e) {
// on any error, display the stack trace. e.printStackTrace();
}
}
/**
* Stops and releases all resources used in application.
*/@Overridepublicvoidstop(){
if (sceneView != null) {
sceneView.dispose();
}
}
/**
* Opens and runs application.
*
* @param args arguments passed to this application
*/publicstaticvoidmain(String[] args){
Application.launch(args);
}
}