Find a point on a Path
Find the point on a line-segment path that is closest to a query geographic point.


package com.eegeo.apisamples;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.RelativeLayout;
import android.widget.Toast;
import androidx.core.graphics.ColorUtils;
import java.util.List;
import java.util.ArrayList;
import com.eegeo.indoors.IndoorMapView;
import com.eegeo.mapapi.EegeoApi;
import com.eegeo.mapapi.EegeoMap;
import com.eegeo.mapapi.MapView;
import com.eegeo.mapapi.map.OnMapReadyCallback;
import com.eegeo.mapapi.geometry.LatLng;
import com.eegeo.mapapi.markers.Marker;
import com.eegeo.mapapi.markers.MarkerOptions;
import com.eegeo.mapapi.paths.PointOnPath;
import com.eegeo.mapapi.polylines.Polyline;
import com.eegeo.mapapi.polylines.PolylineOptions;
import com.eegeo.mapapi.services.routing.OnRoutingQueryCompletedListener;
import com.eegeo.mapapi.services.routing.RoutingService;
import com.eegeo.mapapi.services.routing.RoutingQuery;
import com.eegeo.mapapi.services.routing.RoutingQueryOptions;
import com.eegeo.mapapi.services.routing.RoutingQueryResponse;
import com.eegeo.mapapi.util.Ready;
import com.eegeo.mapapi.widgets.RouteView;
import com.eegeo.mapapi.widgets.RouteViewOptions;
public class FindPointOnPathActivity extends WrldExampleActivity {
private MapView m_mapView;
private IndoorMapView m_indoorMapView = null;
private EegeoMap m_eegeoMap = null;
private List<Marker> m_markers = new ArrayList<Marker>();
private Polyline m_polyline = null;
private List<LatLng> m_path = new ArrayList<LatLng>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EegeoApi.init(this, getString(R.string.eegeo_api_key));
setContentView(R.layout.find_point_on_path_activity);
m_mapView = (MapView) findViewById(R.id.find_point_on_path_mapview);
m_mapView.onCreate(savedInstanceState);
m_path.add(new LatLng(56.459866, -2.980015));
m_path.add(new LatLng(56.459727, -2.979299));
m_path.add(new LatLng(56.461067, -2.979750));
m_path.add(new LatLng(56.461017, -2.980325));
m_mapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(final EegeoMap map) {
m_eegeoMap = map;
m_polyline = m_eegeoMap.addPolyline(new PolylineOptions()
.add(
m_path.get(0),
m_path.get(1),
m_path.get(2),
m_path.get(3))
.color(ColorUtils.setAlphaComponent(Color.RED, 128))
);
final LatLng latLng = new LatLng(56.460624, -2.978936);
m_eegeoMap.getPointOnPath(latLng, m_path)
.then(new Ready<PointOnPath>() {
@Override
public void ready(PointOnPath pointOnPath) {
MarkerOptions targetMarkerOptions = new MarkerOptions().position(latLng).labelText("Target Point");
final Marker targetMarker = m_eegeoMap.addMarker(targetMarkerOptions);
m_markers.add(targetMarker);
MarkerOptions resultMarkerOptions = new MarkerOptions().position(pointOnPath.resultPoint).labelText("Result Point: "
+ "\n fractionAlongPath: " + Double.toString(pointOnPath.fractionAlongPath));
Marker resultMarker = m_eegeoMap.addMarker(resultMarkerOptions);
m_markers.add(resultMarker);
}
});
}
});
}
@Override
protected void onResume() {
super.onResume();
m_mapView.onResume();
}
@Override
protected void onPause() {
super.onPause();
m_mapView.onPause();
}
@Override
protected void onDestroy() {
super.onDestroy();
if (m_eegeoMap != null) {
for (Marker marker: m_markers) {
m_eegeoMap.removeMarker(marker);
}
m_eegeoMap.removePolyline(m_polyline);
}
m_mapView.onDestroy();
}
}