getWorldWidth method

double getWorldWidth()

Returns the width of the world in geometry coordinates.

Is used at least in 2 cases:

  • my polyline crosses longitude 180, and I somehow need to "add a world" to the coordinates in order to display a continuous polyline
  • when my map scrolls around longitude 180 and I have a marker in this area, the marker may be projected a world away, depending on the map being centered either in the 179 or the -179 part - again, we can "add a world"

Implementation

double getWorldWidth() {
  final (x0, _) = projectXY(const LatLng(0, 0));
  final (x180, _) = projectXY(const LatLng(0, 180));
  return 2 * (x0 > x180 ? x0 - x180 : x180 - x0);
}