Geodesic drawn Path LatLng List about curve-fit

[sarweshkumar47]

@aurangzaibumer777 Are you asking about getting the list of latlng points of a curve drawn on google maps? If not, can you give me little more details to understand your question better?

[aurangzaibumer777]

yes, you're right. i need to have list of latlng that google map draws when geodesic is set to true.
like this https://i.stack.imgur.com/EArBf.png
for suppose if i want a geo desic polyline from one point to another (london to istanbul, turkey), the polyline ARC/CURVE will be created by google if i give it both latlng of source and destination and set geodesic property to TRUE but can i have those drawn arc points (which will be set of latlngs or list of latlngs) that google map creates
thanks

[aurangzaibumer777]

actually i want geodesic polyline to animate like this
https://smdaudhilbe.wordpress.com/2014/11/30/how-to-animate-line-gradually-growing-from-starting-point-to-ending-point/
for that, i need set of points so i could pass it to object animator in order to animate the line from one point to another.

[sarweshkumar47]

yes, you're right. i need to have list of latlng that google map draws when geodesic is set to true.
like this https://i.stack.imgur.com/EArBf.png
for suppose if i want a geo desic polyline from one point to another (london to istanbul, turkey), the polyline ARC/CURVE will be created by google if i give it both latlng of source and destination and set geodesic property to TRUE but can i have those drawn arc points (which will be set of latlngs or list of latlngs) that google map creates
thanks

To get a list of LatLng points of a Curve, register a callback interface to be invoked when the curve is drawn on google maps.

curveManager.setOnCurveDrawnCallback(this);

Use getPoints() method of a Curve reference which returns a list of LatLng points.

@Override
public void onCurveDrawn(Curve curve) {
    List<LatLng> latLngList = curve.getPoints();
}

To get a list of LatLng points of a geodesic polyline, call getPoints() on a Polyline reference.

Check the below link for more info.

https://gis.stackexchange.com/questions/194532/how-to-get-polyline-latitude-and-longitude-by-click-on-polyline-android

I hope the above is useful to you.

[aurangzaibumer777]

but the library of your curve draws a different curve than the geodesic
can't it be possible to draw a simple geodesic polyline and get points? the getpoints of polyline gives the source and destination points only, not all the points

[sarweshkumar47]

I wanted to draw curves similar to this (https://drive.google.com/file/d/1BQTDpvN7KaRfWJ4NJt1lsStLT8e5uYSK/view?usp=sharing).

Setting the geodesic option to true did not help me much when I was working on a project. So I decided to use the Bezier cubic equation to draw a curve between the 2 points.

The curve drawn by the library, consists of several small polylines (200 points). AFAIK, setting the geodesic option to true does not make much difference here.

You can try one more trick. Use setAlpha option and set the alpha value to zero and you will get a straight line in most cases. After that, try to get a list of points of a curve (Make sure it satisfies your requirement). If you want a perfectly straight line, use setComputePointsBasedOnScreenPixels option and set it to true (Read the limitation of this method before using it).

[aurangzaibumer777]

no, i actually want to have a geodesic curve and i need an animation like i showed you with a reference link

[aurangzaibumer777]

the same geodesic curve being drawn by google map.
in iOS, we get the same points using GMSGeodesicPolyline, in Android, we got nothing or maybe we need some more digging.

[sarweshkumar47]

no, i actually want to have a geodesic curve and i need an animation like i showed you with a reference link

If you want a geodesic curve/line drawn by the google map, try to use polyline directly. Let me know if you find any solution to your problem.

[aurangzaibumer777]

no, i actually want to have a geodesic curve and i need an animation like i showed you with a reference link

If you want a geodesic curve/line drawn by the google map, try to use polyline directly. Let me know if you find any solution to your problem.

unfortunately i have no way but to use the google map polyline but i need to animate it (just like in the reference link)

[sarweshkumar47]

Closing because of inactivity.