检查路线是否包含特定坐标 [英] Check if route contains a specific coordinates or not
问题描述
我目前正在开发一个应用程序，其中我想知道一条路线是否包含一组特定的经纬度坐标.这是我的代码:
I am currently developing an application in which i want to know if a route contains a certain set of lat long coordinates. Here is my code:
public class PathActivity extends FragmentActivity implements OnMapReadyCallback, RoutingListener {
private GoogleMap mMap;
FetchLocation fetchLocation;
LatLng start;
LatLng end;
ProgressDialog pd;
List<Polyline> polylines;
private static final int[] COLORS = new int[]{R.color.gradient_dark_pink};
FirebaseFirestore firestore;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_path);
//Receiving Object From Intent
Intent rcv = getIntent();
fetchLocation = (FetchLocation) rcv.getSerializableExtra("keyFetchLocationObject2");
pd = new ProgressDialog(this);
pd.setMessage("Please Wait...");
firestore = FirebaseFirestore.getInstance();
fetchAllTrafficLights();
polylines = new ArrayList<>();
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
pd.show();
//Making a Path
start = new LatLng(fetchLocation.latitude, fetchLocation.longitude);
end = new LatLng(fetchLocation.destinationLatitude, fetchLocation.destinationLongitude);
Routing routing = new Routing.Builder()
.travelMode(Routing.TravelMode.DRIVING)
.withListener(this)
.alternativeRoutes(false)
.waypoints(start, end)
.build();
routing.execute();
}
@Override
public void onRoutingFailure(RouteException e)
{
Toast.makeText(this, "Error: " + e.getMessage(), Toast.LENGTH_LONG).show();
pd.dismiss();
}
@Override
public void onRoutingStart() {
}
@Override
public void onRoutingSuccess(ArrayList<Route> route, int shortestRouteIndex)
{
pd.dismiss();
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(start, 16));
if(polylines.size()>0) {
for (Polyline poly : polylines) {
poly.remove();
}
}
polylines = new ArrayList<>();
//add route(s) to the map.
for (int i = 0; i <route.size(); i++)
{
//In case of more than 5 alternative routes
int colorIndex = i % COLORS.length;
PolylineOptions polyOptions = new PolylineOptions();
polyOptions.color(getResources().getColor(COLORS[colorIndex]));
polyOptions.width(10 + i * 3);
polyOptions.addAll(route.get(i).getPoints());
Polyline polyline = mMap.addPolyline(polyOptions);
polylines.add(polyline);
Toast.makeText(getApplicationContext(),"Route "+ (i+1) +": distance - "+ route.get(i).getDistanceValue()+": duration - "+ route.get(i).getDurationValue(),Toast.LENGTH_SHORT).show();
// Start marker
MarkerOptions options = new MarkerOptions();
options.position(start);
options.icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_start_blue));
mMap.addMarker(options);
// End marker
options = new MarkerOptions();
options.position(end);
options.icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_end_green));
mMap.addMarker(options);
}
}
@Override
public void onRoutingCancelled() {
}
public void fetchAllTrafficLights()
{
pd.show();
firestore.collection("Controller").get().addOnCompleteListener(this, new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(Task<QuerySnapshot> task)
{
if(task.isSuccessful())
{
for(QueryDocumentSnapshot documentSnapshot : task.getResult())
{
Log.i("Hello", documentSnapshot.get("controllerLatitude").toString() + " " + documentSnapshot.get("controllerLongitude").toString());
pd.dismiss();
}
}
}
})
.addOnFailureListener(this, new OnFailureListener()
{
@Override
public void onFailure(Exception e)
{
Toast.makeText(PathActivity.this, "Error: " + e.getMessage(), Toast.LENGTH_SHORT).show();
pd.dismiss();
}
});
}
}
我正在使用github库: https://github.com/jd-alexander /Google-Directions-Android 绘制两点之间的路线. 已协调的对象已保存在Firestore数据库中，并已成功获取，如Log中所示.现在，我要检查从数据库中获取的纬度长点是否在路径中.例如.如果我们从A点移动到D点，我想检查路线上是否存在B，C点.我还想知道Google Places API是否始终在两个位置之间给出相同的路线坐标.这是我的对象:
I am using github library: https://github.com/jd-alexander/Google-Directions-Android to draw the route between two points. The coordinated are already saved in the firestore database and are successfully fetched as shown in Log. Now I want to check if the lat long points fetched from database are in the path or not. Eg. If we move from point A to D, I want to check points B,C are present on the route or not. I also want to know does the google places api always give same route coordinates between two locations. Here is my object:
public class FetchLocation implements Serializable
{
public double latitude;
public double longitude;
public double destinationLatitude;
public double destinationLongitude;
public FetchLocation()
{
}
public FetchLocation(double latitude, double longitude, double destinationLatitude, double destinationLongitude) {
this.latitude = latitude;
this.longitude = longitude;
this.destinationLatitude = destinationLatitude;
this.destinationLongitude = destinationLongitude;
}
@Override
public String toString() {
return "FetchLocation{" +
"latitude=" + latitude +
", longitude=" + longitude +
", destinationLatitude=" + destinationLatitude +
", destinationLongitude=" + destinationLongitude +
'}';
}
}
在上一个活动中，使用google place自动完成获取了用户来源经纬度- https ://developers.google.com/places/android-sdk/autocomplete 并在传递给此活动的对象中进行设置.
The users source lat long are fetched in the previous activity using google place autocomplete- https://developers.google.com/places/android-sdk/autocomplete and are set in the object which is passed to this activity.
任何人都请帮忙！
推荐答案
看看 Google Maps Android API实用程序库.您需要获取从A到D的折线路径，并使用isLocationOnPath()检查列表中的每个点(B和C)(如果它位于A-D路径上).像这样的东西:
Take a look at PolyUtil.isLocationOnPath(LatLng point, java.util.List<LatLng> polyline, boolean geodesic, double tolerance) method of Google Maps Android API Utility Library. You need to get polyline path from A to D and check each point from list (B and C) with isLocationOnPath() if it laying on A-D path. Something like that:
for (LatLng point : pointsBandCList) {
if (PolyUtil.isLocationOnPath(point, polylineFromAtoD.getPoints(), true, 100)) {
// "point" laying on A to D path
...
}
}
其中100-是公差(以米为单位).您可以根据自己的任务进行调整.
where 100 - is tolerance (in meters). You can adjust it for your task.
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