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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
/* Copyright 2022 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.arcgismaps.sample.findnearestvertex
import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.databinding.DataBindingUtil
import androidx.lifecycle.lifecycleScope
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.arcgismaps.Color
import com.arcgismaps.geometry.GeometryEngine
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.Polygon
import com.arcgismaps.geometry.PolygonBuilder
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.layers.FeatureLayer
import com.arcgismaps.mapping.symbology.SimpleFillSymbol
import com.arcgismaps.mapping.symbology.SimpleFillSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.portal.Portal
import com.arcgismaps.portal.PortalItem
import com.esri.arcgismaps.sample.findnearestvertex.databinding.ActivityMainBinding
import com.google.android.material.snackbar.Snackbar
import kotlinx.coroutines.launch
class MainActivity : AppCompatActivity() {
private val TAG = MainActivity::class.java.simpleName
// set up data binding for the activity
private val activityMainBinding: ActivityMainBinding by lazy {
DataBindingUtil.setContentView(this, R.layout.activity_main)
}
private val mapView by lazy {
activityMainBinding.mapView
}
private val distanceLayout: ConstraintLayout by lazy {
activityMainBinding.distanceLayout
}
private val vertexDistanceTextView: TextView by lazy {
activityMainBinding.vertexDistanceTextView
}
private val coordinateDistanceTextView: TextView by lazy {
activityMainBinding.coordinateDistanceTextView
}
// California zone 5 (ftUS) state plane coordinate system.
private val statePlaneCaliforniaZone5SpatialReference = SpatialReference(2229)
// create graphics with symbols for tapped location, nearest coordinate, and nearest vertex
private val tappedLocationGraphic =
Graphic(symbol = SimpleMarkerSymbol(SimpleMarkerSymbolStyle.X, Color.magenta, 15f))
// create graphic symbol of the nearest coordinate
private val nearestCoordinateGraphic =
Graphic(symbol = SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Diamond, Color.red, 10f))
// create graphic symbol of the nearest vertex
private val nearestVertexGraphic =
Graphic(symbol = SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Color.blue, 15f))
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// authentication with an API key or named user is
// required to access basemaps and other location services
ArcGISEnvironment.apiKey = ApiKey.create(BuildConfig.API_KEY)
lifecycle.addObserver(mapView)
// create a polygon geometry
val polygon = PolygonBuilder(statePlaneCaliforniaZone5SpatialReference) {
addPoint(Point(6627416.41469281, 1804532.53233782))
addPoint(Point(6669147.89779046, 2479145.16609522))
addPoint(Point(7265673.02678292, 2484254.50442408))
addPoint(Point(7676192.55880379, 2001458.66365744))
}.toGeometry()
// set up the outline and fill color of the polygon
val polygonOutlineSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.green, 2f)
val polygonFillSymbol = SimpleFillSymbol(
SimpleFillSymbolStyle.ForwardDiagonal,
Color.green,
polygonOutlineSymbol
)
// create a polygon graphic
val polygonGraphic = Graphic(polygon, polygonFillSymbol)
// create a graphics overlay to show the polygon, tapped location, and nearest vertex/coordinate
val graphicsOverlay = GraphicsOverlay(
listOf(
polygonGraphic,
tappedLocationGraphic,
nearestCoordinateGraphic,
nearestVertexGraphic
)
)
// create a map using the portal item
val map = ArcGISMap(statePlaneCaliforniaZone5SpatialReference)
val portal = Portal("https://arcgisruntime.maps.arcgis.com")
val portalItem = PortalItem(portal, "99fd67933e754a1181cc755146be21ca")
val usStatesGeneralizedLayer = FeatureLayer(portalItem, 0)
// and add the feature layer to the map's operational layers
map.operationalLayers.add(usStatesGeneralizedLayer)
// add the map to the map view
mapView.map = map
// add the graphics overlay to the map view
mapView.graphicsOverlays.add(graphicsOverlay)
lifecycleScope.launch {
// check if map has loaded
map.load().onSuccess {
// zoom to the polygon's extent
mapView.setViewpointGeometry(polygon.extent, 100.0)
// get point on map tapped
mapView.onSingleTapConfirmed.collect { event ->
// find nearest vertex on map tapped
event.mapPoint?.let { findNearestVertex(it, polygon) }
}
}.onFailure {
showError("Error loading map")
}
}
}
/**
* Finds the nearest vertex from [mapPoint] from the [polygon]
*/
private fun findNearestVertex(mapPoint: Point, polygon: Polygon) {
// show where the user clicked
tappedLocationGraphic.geometry = mapPoint
// use the geometry engine to get the nearest vertex
val nearestVertexResult =
GeometryEngine.nearestVertex(polygon, mapPoint)
// set the nearest vertex graphic's geometry to the nearest vertex
nearestVertexGraphic.geometry = nearestVertexResult?.coordinate
// use the geometry engine to get the nearest coordinate
val nearestCoordinateResult =
GeometryEngine.nearestCoordinate(polygon, mapPoint)
// set the nearest coordinate graphic's geometry to the nearest coordinate
nearestCoordinateGraphic.geometry = nearestCoordinateResult?.coordinate
// show the distances to the nearest vertex and nearest coordinate
distanceLayout.visibility = View.VISIBLE
// convert distance to miles
val vertexDistance = ((nearestVertexResult?.distance)?.div(5280.0))?.toInt()
val coordinateDistance = ((nearestCoordinateResult?.distance)?.div(5280.0))?.toInt()
// set the distance to the text views
vertexDistanceTextView.text = getString(R.string.nearest_vertex, vertexDistance)
coordinateDistanceTextView.text =
getString(R.string.nearest_coordinate, coordinateDistance)
}
private val Color.Companion.blue: Color
get() {
return fromRgba(0, 0, 255, 255)
}
private val Color.Companion.magenta: Color
get() {
return fromRgba(255, 0, 255, 255)
}
private fun showError(message: String) {
Log.e(TAG, message)
Snackbar.make(mapView, message, Snackbar.LENGTH_SHORT).show()
}
}
