| 1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
|
|---|
| 2 | package org.openstreetmap.josm.tools;
|
|---|
| 3 |
|
|---|
| 4 | import java.util.HashMap;
|
|---|
| 5 |
|
|---|
| 6 | import org.openstreetmap.josm.data.Bounds;
|
|---|
| 7 | import org.openstreetmap.josm.data.coor.LatLon;
|
|---|
| 8 |
|
|---|
| 9 | public class OsmUrlToBounds {
|
|---|
| 10 |
|
|---|
| 11 | public static Bounds parse(String url) {
|
|---|
| 12 | int i = url.indexOf('?');
|
|---|
| 13 | if (i == -1)
|
|---|
| 14 | return null;
|
|---|
| 15 | String[] args = url.substring(i+1).split("&");
|
|---|
| 16 | HashMap<String, String> map = new HashMap<String, String>();
|
|---|
| 17 | for (String arg : args) {
|
|---|
| 18 | int eq = arg.indexOf('=');
|
|---|
| 19 | if (eq != -1) {
|
|---|
| 20 | map.put(arg.substring(0, eq), arg.substring(eq + 1));
|
|---|
| 21 | }
|
|---|
| 22 | }
|
|---|
| 23 |
|
|---|
| 24 | Bounds b = null;
|
|---|
| 25 | try {
|
|---|
| 26 | if (map.containsKey("bbox")) {
|
|---|
| 27 | String bbox[] = map.get("bbox").split(",");
|
|---|
| 28 | b = new Bounds(
|
|---|
| 29 | new LatLon(Double.parseDouble(bbox[1]), Double.parseDouble(bbox[0])),
|
|---|
| 30 | new LatLon(Double.parseDouble(bbox[3]), Double.parseDouble(bbox[2])));
|
|---|
| 31 | } else if (map.containsKey("minlat")) {
|
|---|
| 32 | String s = map.get("minlat");
|
|---|
| 33 | Double minlat = Double.parseDouble(s);
|
|---|
| 34 | s = map.get("minlon");
|
|---|
| 35 | Double minlon = Double.parseDouble(s);
|
|---|
| 36 | s = map.get("maxlat");
|
|---|
| 37 | Double maxlat = Double.parseDouble(s);
|
|---|
| 38 | s = map.get("maxlon");
|
|---|
| 39 | Double maxlon = Double.parseDouble(s);
|
|---|
| 40 | b = new Bounds(new LatLon(minlat, minlon), new LatLon(maxlat, maxlon));
|
|---|
| 41 | } else {
|
|---|
| 42 | double size = 180.0 / Math.pow(2, Integer.parseInt(map.get("zoom")));
|
|---|
| 43 | b = new Bounds(
|
|---|
| 44 | new LatLon(parseDouble(map, "lat") - size/2, parseDouble(map, "lon") - size),
|
|---|
| 45 | new LatLon(parseDouble(map, "lat") + size/2, parseDouble(map, "lon") + size));
|
|---|
| 46 | }
|
|---|
| 47 | } catch (NumberFormatException x) {
|
|---|
| 48 | } catch (NullPointerException x) {
|
|---|
| 49 | }
|
|---|
| 50 | return b;
|
|---|
| 51 | }
|
|---|
| 52 |
|
|---|
| 53 | private static double parseDouble(HashMap<String, String> map, String key) {
|
|---|
| 54 | if (map.containsKey(key))
|
|---|
| 55 | return Double.parseDouble(map.get(key));
|
|---|
| 56 | return Double.parseDouble(map.get("m"+key));
|
|---|
| 57 | }
|
|---|
| 58 |
|
|---|
| 59 | static public int getZoom(Bounds b) {
|
|---|
| 60 | // convert to mercator (for calculation of zoom only)
|
|---|
| 61 | double latMin = Math.log(Math.tan(Math.PI/4.0+b.min.lat()/180.0*Math.PI/2.0))*180.0/Math.PI;
|
|---|
| 62 | double latMax = Math.log(Math.tan(Math.PI/4.0+b.max.lat()/180.0*Math.PI/2.0))*180.0/Math.PI;
|
|---|
| 63 | double size = Math.max(Math.abs(latMax-latMin), Math.abs(b.max.lon()-b.min.lon()));
|
|---|
| 64 | int zoom = 0;
|
|---|
| 65 | while (zoom <= 20) {
|
|---|
| 66 | if (size >= 180)
|
|---|
| 67 | break;
|
|---|
| 68 | size *= 2;
|
|---|
| 69 | zoom++;
|
|---|
| 70 | }
|
|---|
| 71 | return zoom;
|
|---|
| 72 | }
|
|---|
| 73 |
|
|---|
| 74 | static public String getURL(Bounds b) {
|
|---|
| 75 | return getURL(b.getCenter(), getZoom(b));
|
|---|
| 76 | }
|
|---|
| 77 |
|
|---|
| 78 | static public String getURL(LatLon pos, int zoom) {
|
|---|
| 79 | // Truncate lat and lon to something more sensible
|
|---|
| 80 | int decimals = (int) Math.pow(10, (zoom / 3));
|
|---|
| 81 | double lat = (Math.round(pos.lat() * decimals));
|
|---|
| 82 | lat /= decimals;
|
|---|
| 83 | double lon = (Math.round(pos.lon() * decimals));
|
|---|
| 84 | lon /= decimals;
|
|---|
| 85 | return new String("http://www.openstreetmap.org/?lat="+lat+"&lon="+lon+"&zoom="+zoom);
|
|---|
| 86 | }
|
|---|
| 87 | }
|
|---|
