298 lines
8.8 KiB
Java
298 lines
8.8 KiB
Java
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/**
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* This utility class includes :
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* 1. distance algorithms
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* 2. finding center for array of nodes
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* 3. tile evaluation algorithms
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*
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*
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*/
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public class MapUtils_1 {
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private static final String BASE_SHORT_OSM_URL = "http://osm.org/go/";
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/**
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* This array is a lookup table that translates 6-bit positive integger
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* index values into their "Base64 Alphabet" equivalents as specified
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* in Table 1 of RFC 2045.
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*/
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private static final char intToBase64[] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
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'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
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'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '_', '@'
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};
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/**
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* Gets distance in meters
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*/
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public static double getDistance(double lat1, double lon1, double lat2, double lon2){
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double R = 6371; // km
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double dLat = Math.toRadians(lat2-lat1);
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double dLon = Math.toRadians(lon2-lon1);
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double a = Math.sin(dLat/2) * Math.sin(dLat/2) +
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Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) *
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Math.sin(dLon/2) * Math.sin(dLon/2);
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double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
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return R * c * 1000;
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}
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public static double checkLongitude(double longitude) {
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while (longitude < -180 || longitude > 180) {
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if (longitude < 0) {
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longitude += 360;
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} else {
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longitude -= 360;
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}
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}
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return longitude;
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}
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public static double checkLatitude(double latitude) {
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while (latitude < -90 || latitude > 90) {
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if (latitude < 0) {
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latitude += 180;
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} else {
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latitude -= 180;
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}
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}
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if(latitude < -85.0511) {
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return -85.0511;
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} else if(latitude > 85.0511){
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return 85.0511;
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}
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return latitude;
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}
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public static int get31TileNumberX(double longitude){
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longitude = checkLongitude(longitude);
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long l = 1l << 31;
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return (int)((longitude + 180d)/360d * l);
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}
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public static int get31TileNumberY( double latitude){
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latitude = checkLatitude(latitude);
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double eval = Math.log( Math.tan(Math.toRadians(latitude)) + 1/Math.cos(Math.toRadians(latitude)) );
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long l = 1l << 31;
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if(eval > Math.PI){
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eval = Math.PI;
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}
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return (int) ((1 - eval / Math.PI) / 2 * l);
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}
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public static double get31LongitudeX(int tileX){
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return getLongitudeFromTile(21, tileX /1024f);
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}
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public static double get31LatitudeY(int tileY){
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return getLatitudeFromTile(21, tileY /1024f);
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}
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/**
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*
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* Theses methods operate with degrees (evaluating tiles & vice versa)
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* degree longitude measurements (-180, 180) [27.56 Minsk]
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// degree latitude measurements (90, -90) [53.9]
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*/
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public static double getTileNumberX(float zoom, double longitude){
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if(longitude == 180d) {
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return getPowZoom(zoom) - 1;
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}
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longitude = checkLongitude(longitude);
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return (longitude + 180d)/360d * getPowZoom(zoom);
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}
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public static double getTileNumberY(float zoom, double latitude){
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latitude = checkLatitude(latitude);
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double eval = Math.log( Math.tan(Math.toRadians(latitude)) + 1/Math.cos(Math.toRadians(latitude)) );
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if (Double.isInfinite(eval) || Double.isNaN(eval)) {
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latitude = latitude < 0 ? - 89.9 : 89.9;
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eval = Math.log( Math.tan(Math.toRadians(latitude)) + 1/Math.cos(Math.toRadians(latitude)) );
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}
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double result = (1 - eval / Math.PI) / 2 * getPowZoom(zoom);
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return result;
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}
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public static double getTileEllipsoidNumberY(float zoom, double latitude){
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final double E2 = (double) latitude * Math.PI / 180;
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final long sradiusa = 6378137;
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final long sradiusb = 6356752;
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final double J2 = (double) Math.sqrt(sradiusa * sradiusa - sradiusb * sradiusb) / sradiusa;
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final double M2 = (double) Math.log((1 + Math.sin(E2))
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/ (1 - Math.sin(E2)))/ 2- J2 * Math.log((1 + J2 * Math.sin(E2))/ (1 - J2 * Math.sin(E2))) / 2;
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final double B2 = getPowZoom(zoom);
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return B2 / 2 - M2 * B2 / 2 / Math.PI;
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}
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public static double getLatitudeFromEllipsoidTileY(float zoom, float tileNumberY){
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final double MerkElipsK = 0.0000001;
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final long sradiusa = 6378137;
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final long sradiusb = 6356752;
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final double FExct = (double) Math.sqrt(sradiusa * sradiusa
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- sradiusb * sradiusb)
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/ sradiusa;
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final double TilesAtZoom = getPowZoom(zoom);
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double result = (tileNumberY - TilesAtZoom / 2)
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/ -(TilesAtZoom / (2 * Math.PI));
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result = (2 * Math.atan(Math.exp(result)) - Math.PI / 2) * 180
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/ Math.PI;
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double Zu = result / (180 / Math.PI);
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double yy = (tileNumberY - TilesAtZoom / 2);
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double Zum1 = Zu;
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Zu = Math.asin(1 - ((1 + Math.sin(Zum1)) * Math.pow(1 - FExct * Math.sin(Zum1), FExct))
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/ (Math.exp((2 * yy) / -(TilesAtZoom / (2 * Math.PI))) * Math.pow(1 + FExct * Math.sin(Zum1), FExct)));
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while (Math.abs(Zum1 - Zu) >= MerkElipsK) {
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Zum1 = Zu;
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Zu = Math.asin(1 - ((1 + Math.sin(Zum1)) * Math.pow(1 - FExct * Math.sin(Zum1), FExct))
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/ (Math.exp((2 * yy) / -(TilesAtZoom / (2 * Math.PI))) * Math.pow(1 + FExct * Math.sin(Zum1), FExct)));
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}
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return Zu * 180 / Math.PI;
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}
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public static double getLongitudeFromTile(float zoom, double x) {
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return x / getPowZoom(zoom) * 360.0 - 180.0;
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}
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public static double getPowZoom(float zoom){
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if(zoom >= 0 && zoom - Math.floor(zoom) < 0.05f){
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return 1 << ((int)zoom);
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} else {
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return Math.pow(2, zoom);
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}
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}
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public static float calcDiffPixelX(float rotateSin, float rotateCos, float dTileX, float dTileY, float tileSize){
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return (rotateCos * dTileX - rotateSin * dTileY) * tileSize ;
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}
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public static float calcDiffPixelY(float rotateSin, float rotateCos, float dTileX, float dTileY, float tileSize){
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return (rotateSin * dTileX + rotateCos * dTileY) * tileSize ;
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}
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public static double getLatitudeFromTile(float zoom, double y){
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int sign = y < 0 ? -1 : 1;
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double result = Math.atan(sign*Math.sinh(Math.PI * (1 - 2 * y / getPowZoom(zoom)))) * 180d / Math.PI;
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return result;
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}
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public static int getPixelShiftX(int zoom, double long1, double long2, int tileSize){
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return (int) ((getTileNumberX(zoom, long1) - getTileNumberX(zoom, long2)) * tileSize);
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}
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public static int getPixelShiftY(int zoom, double lat1, double lat2, int tileSize){
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return (int) ((getTileNumberY(zoom, lat1) - getTileNumberY(zoom, lat2)) * tileSize);
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}
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// Examples
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// System.out.println(buildShortOsmUrl(51.51829d, 0.07347d, 16)); // http://osm.org/go/0EEQsyfu
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// System.out.println(buildShortOsmUrl(52.30103d, 4.862927d, 18)); // http://osm.org/go/0E4_JiVhs
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// System.out.println(buildShortOsmUrl(40.59d, -115.213d, 9)); // http://osm.org/go/TelHTB--
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public static String buildShortOsmUrl(double latitude, double longitude, int zoom){
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long lat = (long) (((latitude + 90d)/180d)*(1l << 32));
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long lon = (long) (((longitude + 180d)/360d)*(1l << 32));
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long code = interleaveBits(lon, lat);
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StringBuilder str = new StringBuilder(10);
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str.append(BASE_SHORT_OSM_URL);
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// add eight to the zoom level, which approximates an accuracy of one pixel in a tile.
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for(int i=0; i< Math.ceil((zoom+8)/3d); i++){
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str.append(intToBase64[(int) ((code >> (58 - 6 * i)) & 0x3f)]);
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}
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// append characters onto the end of the string to represent
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// partial zoom levels (characters themselves have a granularity of 3 zoom levels).
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for(int j=0; j< (zoom + 8) % 3 ; j++){
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str.append('-');
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}
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str.append("?m");
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return str.toString();
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}
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/**
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* interleaves the bits of two 32-bit numbers. the result is known as a Morton code.
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*/
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private static long interleaveBits(long x, long y){
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long c = 0;
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for(byte b = 31; b>=0; b--){
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c = (c << 1) | ((x >> b) & 1);
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c = (c << 1) | ((y >> b) & 1);
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}
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return c;
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}
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/**
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* Calculate rotation diff D, that R (rotate) + D = T (targetRotate)
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* D is between -180, 180
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* @param rotate
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* @param targetRotate
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* @return
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*/
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public static float unifyRotationDiff(float rotate, float targetRotate) {
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float d = targetRotate - rotate;
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while(d >= 180){
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d -= 360;
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}
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while(d < -180){
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d += 360;
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}
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return d;
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}
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/**
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* Calculate rotation diff D, that R (rotate) + D = T (targetRotate)
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* D is between -180, 180
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* @param rotate
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* @param targetRotate
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* @return
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*/
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public static float unifyRotationTo360(float rotate) {
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while(rotate < 0){
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rotate += 360;
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}
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while(rotate > 360){
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rotate -= 360;
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}
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return rotate;
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}
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/**
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* @param diff align difference between 2 angles ]-PI, PI]
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* @return
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*/
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public static double alignAngleDifference(double diff) {
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while(diff > Math.PI) {
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diff -= 2 * Math.PI;
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}
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while(diff <=-Math.PI) {
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diff += 2 * Math.PI;
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}
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return diff;
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}
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/**
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* @param diff align difference between 2 angles ]-180, 180]
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* @return
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*/
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public static double degreesDiff(double a1, double a2) {
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double diff = a1 - a2;
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while(diff > 180) {
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diff -= 360;
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}
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while(diff <=-180) {
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diff += 360;
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}
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return diff;
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}
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}
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