Google IO 2013 App Mystery Values

Question

I'm trying to make use of the SVGTileProvider that is found in the Google IO 2013 app. I can't figure out exactly how to position an image on the Google Map though. I've narrowed it down to this section of the class. These aren't lat/long coordinates however somehow they must be coming from lat/long coordinates. Does anyone know what these are or where they come from?

mBaseMatrix.setPolyToPoly(
    new float[]{
        0, 0,
        limits.width(), 0,
        limits.width(), limits.height()
    }, 0,
    new float[]{
        40.95635986328125f, 98.94217824936158f,
        40.95730018615723f, 98.94123077396628f,
        40.95791244506836f, 98.94186019897214f
    }, 0, 3);

Update

The first set of mystery numbers roughly translates to lat/long 37.783887,-122.405107.

Update 2

These methods help me convert latitude to a y value and vice versa. How can I do this for X and Longitude?

public static double y2lat(double aY) {
    return Math.toDegrees(2 * Math.atan(Math.exp(Math.toRadians(aY))) - Math.PI / 2);
}
public static double lat2y(double aLat) {
    return Math.toDegrees(Math.log(Math.tan(Math.PI / 4 + Math.toRadians(aLat) / 2)));
}

Answer 1

Turns out these are World Coordinates.

Here is some java code to translate from lat/long to x/y.

public static float lat2y(double aLat) {
    return (float) (((1 - Math.log(Math.tan(aLat * Math.PI / 180) + 1 / Math.cos(aLat * Math.PI / 180)) / Math.PI) / 2 * Math.pow(2, 0)) * 256);
}
public static float lon2x(double lon) {
    return (float) ((lon + 180f) / 360f * 256f);
}

Answer 2

See the class TileProjection I posted in the answer to this SO question. If Sababado is right, that the numbers are WorldCoordinates, then this class should help you to convert them. You can find the formulas also here.