Geodesic operations

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
/* 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.geodesicoperations;

import java.util.Arrays;

import android.graphics.Color;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.GeodeticCurveType;
import com.esri.arcgisruntime.geometry.Geometry;
import com.esri.arcgisruntime.geometry.GeometryEngine;
import com.esri.arcgisruntime.geometry.LinearUnit;
import com.esri.arcgisruntime.geometry.LinearUnitId;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.PointCollection;
import com.esri.arcgisruntime.geometry.Polyline;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.Callout;
import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener;
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.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;

public class MainActivity extends AppCompatActivity {

  private MapView mMapView;
  private final LinearUnit mUnitOfMeasurement = new LinearUnit(LinearUnitId.KILOMETERS);

  @Override
  protected void onCreate(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);

    // create a map
    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_IMAGERY);

    // set map to a map view
    mMapView = findViewById(R.id.mapView);
    mMapView.setMap(map);

    // create a graphic overlay
    GraphicsOverlay graphicsOverlay = new GraphicsOverlay();
    mMapView.getGraphicsOverlays().add(graphicsOverlay);

    // add a graphic at JFK to represent the flight start location
    final Point start = new Point(-73.7781, 40.6413, SpatialReferences.getWgs84());
    SimpleMarkerSymbol locationMarker = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.BLUE, 10);
    Graphic startLocation = new Graphic(start, locationMarker);
    graphicsOverlay.getGraphics().add(startLocation);

    // create graphic for the destination
    final Graphic endLocation = new Graphic();
    endLocation.setSymbol(locationMarker);
    graphicsOverlay.getGraphics().add(endLocation);

    // create graphic representing the geodesic path between the two locations
    final Graphic path = new Graphic();
    path.setSymbol(new SimpleLineSymbol(SimpleLineSymbol.Style.DASH, Color.BLUE, 5));
    graphicsOverlay.getGraphics().add(path);

    // add onTouchListener to get the location of the user tap
    mMapView.setOnTouchListener(new DefaultMapViewOnTouchListener(this, mMapView) {
      @Override
      public boolean onSingleTapConfirmed(MotionEvent motionEvent) {
        // get the point that was clicked and convert it to a point in the map
        android.graphics.Point clickLocation = new android.graphics.Point(Math.round(motionEvent.getX()),
            Math.round(motionEvent.getY()));
        Point mapPoint = mMapView.screenToLocation(clickLocation);
        final Point destination = (Point) GeometryEngine.project(mapPoint, SpatialReferences.getWgs84());
        endLocation.setGeometry(destination);
        // create a straight line path between the start and end locations
        PointCollection points = new PointCollection(Arrays.asList(start, destination), SpatialReferences.getWgs84());
        Polyline polyline = new Polyline(points);
        // densify the path as a geodesic curve and show it with the path graphic
        Geometry pathGeometry = GeometryEngine
            .densifyGeodetic(polyline, 1, mUnitOfMeasurement, GeodeticCurveType.GEODESIC);
        path.setGeometry(pathGeometry);
        // calculate the path distance
        double distance = GeometryEngine.lengthGeodetic(pathGeometry, mUnitOfMeasurement, GeodeticCurveType.GEODESIC);

        // create a textview for the callout
        TextView calloutContent = new TextView(getApplicationContext());
        calloutContent.setTextColor(Color.BLACK);
        calloutContent.setSingleLine();
        // format coordinates to 2 decimal places
        calloutContent.setText("Distance: " + String.format("%.2f", distance) + " Kilometers");
        final Callout callout = mMapView.getCallout();
        callout.setLocation(mapPoint);
        callout.setContent(calloutContent);
        callout.show();
        return true;

      }
    });

  }

  @Override
  protected void onPause() {
    mMapView.pause();
    super.onPause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }
  @Override
  protected void onDestroy() {
    super.onDestroy();
    mMapView.dispose();
  }
}