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A tool to package OpenStreetMap tiles

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// Created by plusminus on 10:15:51 PM - Mar 5, 2009
package org.osmdroid.mtp.util;

import org.osmdroid.mtp.adt.OSMTileInfo;

public class Util {
	// ===========================================================
	// Constants
	// ===========================================================

	// ===========================================================
	// Fields
	// ===========================================================

	// ===========================================================
	// Constructors
	// ===========================================================

	// ===========================================================
	// Getter & Setter
	// ===========================================================

	// ===========================================================
	// Methods from SuperClass/Interfaces
	// ===========================================================

	// ===========================================================
	// Methods
	// ===========================================================

	/**
	 * For a description see:
	 * @see http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames
	 * For a code-description see:
	 * @see http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames#compute_bounding_box_for_tile_number
	 * @param aLat latitude to get the {@link OSMTileInfo} for.
	 * @param aLon longitude to get the {@link OSMTileInfo} for.
	 * @return The {@link OSMTileInfo} providing 'x' 'y' and 'z'(oom) for the coordinates passed.
	 */
	public static OSMTileInfo getMapTileFromCoordinates(final double aLat, final double aLon, final int zoom) {
		final int y = (int) Math.floor((1 - Math.log(Math.tan(aLat * Math.PI / 180) + 1 / Math.cos(aLat * Math.PI / 180)) / Math.PI) / 2 * (1 << zoom));
		final int x = (int) Math.floor((aLon + 180) / 360 * (1 << zoom));

		return new OSMTileInfo(x, y, zoom);
	}

	// ===========================================================
	// Inner and Anonymous Classes
	// ===========================================================
}