Specifies the map projection.
You can use one of the following out-of-the-box projections:
- Mercator projection
- Equirectangular projection
- Lambert cylindrical projection
- Miller cylindrical projection
Specifies the projection's ratio of the width to the height.
Extreme points of the widget coordinate system form a square. Set this option to change the projection's form; for example, make the width more than height.
Converts coordinates from [x, y] to [lon, lat].
Converts coordinates from [lon, lat] to [x, y].