API to retrieve screen position of markers.

[dagatsoin]

Related: #3116.
I have a scenario where a single wkwebview (or crosswalk) view would track Mapbox dummies markers (maybe 100 max). It is for a RPG game.

My goal is to separate the heavy computing (sprites, collision, particules, etc.) for characters and monsters from the map background.

I think that the only thing I need is an API which exposes the screen position of the MB dummies markers. Is there such API?
cc @incanus

[tobrun]

@dagatsoin that is a cool use-case. Would love to see the end result.

API which exposes the screen position of the MB dummies markers

Currently our markers don't expose screen position as an attribute but as a LatLng.
We support a conversion method in map.cpp that will return the screen position:

PrecisionPoint Map::pixelForLatLng(const LatLng& latLng) const {
    return transform->latLngToPoint(latLng);
}

The mentioned method is found in our core, but you are probably looking for a method found in one of our bindings (Android, iOS, OSX,..). Could you mention the binding you are using?

[friedbunny]

Screen position ↔ map coordinate conversion functions are available in iOS — you’ll probably want -convertCoordinate:toPointToView:.

Here’s an interactive example of how to do point/coordinate conversion.

[UmairKhalid786]

Is there any way to do it in Android SDK ? @friedbunny

[tobrun]

@UmairKhalid786 You can use Projection#toScreenLocation and Projection#fromScreenLocation to convert LatLng into pixels on screen or reversed.