See below. Use:
TileCoordinate c = new TileCoordinate(lat, lon, zoom);
if (c.locationCoord()) {
// Do whatever
}
whereas lat, lon is the geocoordinate (e.g. 52.123, 13.123) and zoom is
the Google zoom stage (0...17). The resulting x,y is the image
coordinate within the big, fat picture, Google draws for us. The int
part may be used directly to obtain the tiles (Attention: Illegal) using
a URL formed like this:
String.Format("http://mt.google.com/mt?x={0}&y={1}&zoom={2}";, c.x, c.y,
17-zoom)
The fractional part times 256 is the pixel coordinate within the tile
itself.
Regards
using System;
using System.Collections.Generic;
using System.Text;
namespace TileRequest {
class TileCoordinate {
public TileCoordinate(double lat, double lon, int zoom) {
this.lat = lat;
this.lon = lon;
this.zoom = zoom;
}
public double y;
public double x;
public double lat;
public double lon;
public int zoom;
public bool locationCoord() {
if (System.Math.Abs(this.lat) > 85.0511287798066)
return false;
double sin_phi = System.Math.Sin(this.lat * System.Math.PI /
180);
double norm_x = this.lon / 180;
double norm_y = (0.5 * System.Math.Log((1 + sin_phi) / (1 -
sin_phi))) / System.Math.PI;
this.y = System.Math.Pow(2, this.zoom) * ((1 - norm_y) / 2);
this.x = System.Math.Pow(2, this.zoom) * ((norm_x + 1) / 2);
return true;
}
}
}
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