Google Maps API V2. 1 met?

[Rossere]

Hi. I'm doing my TileProvider, and I need to paint on the stash of some radius set in metres. Question: How is it right to transfer a radius in meters to a zoom'a?

[Burma]

From the meters to the pickles:

private static final float EARTH_RADIUS = 6371000; 
private static final int TILE_DIM = 512;
private int meters2pixels(float meters, double lat, int zoomLevel)

{

long map_width = TILE_DIM * (int)Math.pow(2, zoomLevel);

double metersPerPixel = 2 * Math.PI * EARTH_RADIUS * Math.cos(Math.toRadians(lat)) / (double)map_width;

return  (int)(meters / metersPerPixel);

}