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A port of this PHP code: http://stackoverflow.com/questions/1763917/google-static-maps-move-maps-with-a-finger To C# in Unity3D to convert google maps lat/lng to pixel coordinates and vice versa.
using UnityEngine;
using System.Collections;
public class MapUtils {
static float GOOGLEOFFSET = 268435456f;
static float GOOGLEOFFSET_RADIUS = 85445659.44705395f;//GOOGLEOFFSET / Mathf.PI;
static float MATHPI_180 = Mathf.PI/180f;
static private float preLonToX1 = GOOGLEOFFSET_RADIUS * (Mathf.PI/180f);
public static int LonToX( float lon ) {
return ((int)Mathf.Round(GOOGLEOFFSET + preLonToX1 * lon));
}
public static int LatToY( float lat ) {
return (int)Mathf.Round( GOOGLEOFFSET - GOOGLEOFFSET_RADIUS * Mathf.Log((1f + Mathf.Sin(lat * MATHPI_180)) / (1f - Mathf.Sin(lat * MATHPI_180))) / 2f);
}
public static float XToLon( float x) {
return ((Mathf.Round(x) - GOOGLEOFFSET) / GOOGLEOFFSET_RADIUS) * 180f/ Mathf.PI;
}
public static float YToLat( float y) {
return (Mathf.PI / 2f - 2f * Mathf.Atan(Mathf.Exp((Mathf.Round(y) - GOOGLEOFFSET) / GOOGLEOFFSET_RADIUS))) * 180f / Mathf.PI;
}
public static float adjustLonByPixels( float lon, int delta, int zoom) {
return XToLon(LonToX(lon) + (delta << (21 - zoom)));
}
public static float adjustLatByPixels( float lat, int delta, int zoom) {
return YToLat(LatToY(lat) + (delta << (21 - zoom)));
}
}
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