toOffset method
Converts LatLng
coordinates to XY Offset.
Implementation
Offset toOffset(LatLng location) {
final scale = pow(2.0, controller.zoom);
final norm = controller.projection.toTileIndex(controller.center);
final l = controller.projection.toTileIndex(location);
final dx = l.x - norm.x;
final dy = l.y - norm.y;
final s = tileSize * scale;
return Offset(_centerX + dx * s, _centerY + dy * s);
}