如何在谷歌地图上画一条弧线？

Question

嗨，有人可以帮我画一条完全像谷歌地图上的优步吗？ 我需要绘制一个通过放大和移动地图不会降低质量但不会导致滞后的灵魂... 我见过这个图书馆

https://github.com/amalChandran/trail-android

我需要像uber一样平滑的线条 任何帮助表示赞赏...... 喜欢这张图片

Answer 1

  

编译'com.google.maps.android:android-maps-utils:0.5'//dependency,SphericalUtil有一些函数可以计算两个点之间的航向，距离和偏移量，可能对您有所帮助！

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

private GoogleMap mMap;
private LatLng sydney1;
private LatLng sydney2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    mMap.getUiSettings().setZoomControlsEnabled(true);

    // Add a marker in Sydney and move the camera
    sydney1 = new LatLng(-33.904438,151.249852);
    sydney2 = new LatLng(-33.905823,151.252422);

    mMap.addMarker(new MarkerOptions().position(sydney1)
            .draggable(false).visible(true).title("Marker in Sydney 1"));
    mMap.addMarker(new MarkerOptions().position(sydney2)
            .draggable(false).visible(true).title("Marker in Sydney 2"));

    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney1, 16F));

    this.showCurvedPolyline(sydney1,sydney2, 0.5);
}

private void showCurvedPolyline (LatLng p1, LatLng p2, double k) {
    //Calculate distance and heading between two points
    double d = SphericalUtil.computeDistanceBetween(p1,p2);
    double h = SphericalUtil.computeHeading(p1, p2);

    //Midpoint position
    LatLng p = SphericalUtil.computeOffset(p1, d*0.5, h);

    //Apply some mathematics to calculate position of the circle center
    double x = (1-k*k)*d*0.5/(2*k);
    double r = (1+k*k)*d*0.5/(2*k);

    LatLng c = SphericalUtil.computeOffset(p, x, h + 90.0);

    //Polyline options
    PolylineOptions options = new PolylineOptions();

    //Calculate heading between circle center and two points
    double h1 = SphericalUtil.computeHeading(c, p1);
    double h2 = SphericalUtil.computeHeading(c, p2);

    //Calculate positions of points on circle border and add them to polyline options
    int numpoints = 100;
    double step = (h2 -h1) / numpoints;

    for (int i=0; i < numpoints; i++) {
        LatLng pi = SphericalUtil.computeOffset(c, r, h1 + i * step);
        options.add(pi);
    }

    //Draw polyline
    mMap.addPolyline(options.width(10).color(Color.BLACK).geodesic(false));
}

}

<强>结果