1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.awt.Dimension;
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7 | import java.util.HashMap;
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8 | import java.util.Map;
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9 |
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10 | import org.openstreetmap.josm.Main;
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11 | import org.openstreetmap.josm.data.Bounds;
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12 | import org.openstreetmap.josm.data.coor.EastNorth;
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13 | import org.openstreetmap.josm.data.coor.LatLon;
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14 | import org.openstreetmap.josm.data.projection.Ellipsoid;
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15 | import org.openstreetmap.josm.data.projection.Projection;
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16 | import org.openstreetmap.josm.data.projection.Projections;
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17 | import org.openstreetmap.josm.gui.MainApplication;
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18 | import org.openstreetmap.josm.gui.MapView;
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19 | import org.openstreetmap.josm.gui.util.GuiHelper;
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20 |
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21 | /**
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22 | * Parses various URL used in OpenStreetMap projects into {@link Bounds}.
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23 | */
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24 | public final class OsmUrlToBounds {
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25 | private static final String SHORTLINK_PREFIX = "http://osm.org/go/";
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26 |
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27 | private OsmUrlToBounds() {
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28 | // Hide default constructor for utils classes
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29 | }
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30 |
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31 | /**
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32 | * Parses an URL into {@link Bounds}
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33 | * @param url the URL to be parsed
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34 | * @return the parsed {@link Bounds}, or {@code null}
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35 | */
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36 | public static Bounds parse(String url) {
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37 | if (url.startsWith("geo:")) {
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38 | return GeoUrlToBounds.parse(url);
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39 | }
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40 | try {
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41 | // a percent sign indicates an encoded URL (RFC 1738).
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42 | if (url.contains("%")) {
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43 | url = Utils.decodeUrl(url);
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44 | }
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45 | } catch (IllegalArgumentException ex) {
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46 | Logging.error(ex);
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47 | }
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48 | Bounds b = parseShortLink(url);
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49 | if (b != null)
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50 | return b;
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51 | if (url.contains("#map") || url.contains("/#")) {
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52 | // probably it's a URL following the new scheme?
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53 | return parseHashURLs(url);
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54 | }
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55 | final int i = url.indexOf('?');
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56 | if (i == -1) {
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57 | return null;
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58 | }
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59 | String[] args = url.substring(i+1).split("&");
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60 | Map<String, String> map = new HashMap<>();
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61 | for (String arg : args) {
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62 | int eq = arg.indexOf('=');
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63 | if (eq != -1) {
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64 | map.put(arg.substring(0, eq), arg.substring(eq + 1));
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65 | }
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66 | }
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67 |
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68 | try {
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69 | if (map.containsKey("bbox")) {
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70 | String[] bbox = map.get("bbox").split(",");
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71 | b = new Bounds(
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72 | Double.parseDouble(bbox[1]), Double.parseDouble(bbox[0]),
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73 | Double.parseDouble(bbox[3]), Double.parseDouble(bbox[2]));
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74 | } else if (map.containsKey("minlat")) {
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75 | double minlat = Double.parseDouble(map.get("minlat"));
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76 | double minlon = Double.parseDouble(map.get("minlon"));
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77 | double maxlat = Double.parseDouble(map.get("maxlat"));
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78 | double maxlon = Double.parseDouble(map.get("maxlon"));
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79 | b = new Bounds(minlat, minlon, maxlat, maxlon);
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80 | } else {
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81 | String z = map.get("zoom");
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82 | b = positionToBounds(parseDouble(map, "lat"), parseDouble(map, "lon"),
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83 | z == null ? 18 : Integer.parseInt(z));
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84 | }
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85 | } catch (IllegalArgumentException | ArrayIndexOutOfBoundsException ex) {
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86 | Logging.log(Logging.LEVEL_ERROR, url, ex);
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87 | }
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88 | return b;
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89 | }
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90 |
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91 | /**
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92 | * Openstreetmap.org changed it's URL scheme in August 2013, which breaks the URL parsing.
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93 | * The following function, called by the old parse function if necessary, provides parsing new URLs
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94 | * the new URLs follow the scheme https://www.openstreetmap.org/#map=18/51.71873/8.76164&layers=CN
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95 | * @param url string for parsing
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96 | * @return Bounds if hashurl, {@code null} otherwise
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97 | */
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98 | private static Bounds parseHashURLs(String url) {
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99 | int startIndex = url.indexOf('#');
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100 | if (startIndex == -1) return null;
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101 | int endIndex = url.indexOf('&', startIndex);
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102 | if (endIndex == -1) endIndex = url.length();
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103 | String coordPart = url.substring(startIndex+(url.contains("#map=") ? "#map=".length() : "#".length()), endIndex);
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104 | String[] parts = coordPart.split("/");
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105 | if (parts.length < 3) {
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106 | Logging.warn(tr("URL does not contain {0}/{1}/{2}", tr("zoom"), tr("latitude"), tr("longitude")));
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107 | return null;
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108 | }
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109 | int zoom;
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110 | try {
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111 | zoom = Integer.parseInt(parts[0]);
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112 | } catch (NumberFormatException e) {
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113 | Logging.warn(tr("URL does not contain valid {0}", tr("zoom")), e);
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114 | return null;
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115 | }
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116 | double lat, lon;
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117 | try {
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118 | lat = Double.parseDouble(parts[1]);
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119 | } catch (NumberFormatException e) {
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120 | Logging.warn(tr("URL does not contain valid {0}", tr("latitude")), e);
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121 | return null;
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122 | }
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123 | try {
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124 | lon = Double.parseDouble(parts[2]);
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125 | } catch (NumberFormatException e) {
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126 | Logging.warn(tr("URL does not contain valid {0}", tr("longitude")), e);
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127 | return null;
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128 | }
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129 | return positionToBounds(lat, lon, zoom);
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130 | }
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131 |
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132 | private static double parseDouble(Map<String, String> map, String key) {
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133 | if (map.containsKey(key))
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134 | return Double.parseDouble(map.get(key));
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135 | if (map.containsKey('m'+key))
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136 | return Double.parseDouble(map.get('m'+key));
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137 | throw new IllegalArgumentException(map.toString() + " does not contain " + key);
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138 | }
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139 |
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140 | private static final char[] SHORTLINK_CHARS = {
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141 | 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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142 | 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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143 | 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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144 | 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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145 | 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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146 | 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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147 | 'w', 'x', 'y', 'z', '0', '1', '2', '3',
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148 | '4', '5', '6', '7', '8', '9', '_', '@'
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149 | };
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150 |
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151 | /**
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152 | * Parse OSM short link
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153 | *
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154 | * @param url string for parsing
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155 | * @return Bounds if shortlink, null otherwise
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156 | * @see <a href="http://trac.openstreetmap.org/browser/sites/rails_port/lib/short_link.rb">short_link.rb</a>
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157 | */
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158 | private static Bounds parseShortLink(final String url) {
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159 | if (!url.startsWith(SHORTLINK_PREFIX))
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160 | return null;
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161 | final String shortLink = url.substring(SHORTLINK_PREFIX.length());
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162 |
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163 | final Map<Character, Integer> array = new HashMap<>();
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164 |
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165 | for (int i = 0; i < SHORTLINK_CHARS.length; ++i) {
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166 | array.put(SHORTLINK_CHARS[i], i);
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167 | }
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168 |
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169 | // long is necessary (need 32 bit positive value is needed)
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170 | long x = 0;
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171 | long y = 0;
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172 | int zoom = 0;
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173 | int zoomOffset = 0;
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174 |
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175 | for (final char ch : shortLink.toCharArray()) {
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176 | if (array.containsKey(ch)) {
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177 | int val = array.get(ch);
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178 | for (int i = 0; i < 3; ++i) {
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179 | x <<= 1;
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180 | if ((val & 32) != 0) {
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181 | x |= 1;
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182 | }
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183 | val <<= 1;
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184 |
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185 | y <<= 1;
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186 | if ((val & 32) != 0) {
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187 | y |= 1;
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188 | }
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189 | val <<= 1;
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190 | }
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191 | zoom += 3;
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192 | } else {
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193 | zoomOffset--;
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194 | }
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195 | }
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196 |
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197 | x <<= 32 - zoom;
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198 | y <<= 32 - zoom;
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199 |
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200 | // 2**32 == 4294967296
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201 | return positionToBounds(y * 180.0 / 4294967296.0 - 90.0,
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202 | x * 360.0 / 4294967296.0 - 180.0,
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203 | // TODO: -2 was not in ruby code
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204 | zoom - 8 - (zoomOffset % 3) - 2);
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205 | }
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206 |
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207 | private static Dimension getScreenSize() {
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208 | if (MainApplication.isDisplayingMapView()) {
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209 | MapView mapView = MainApplication.getMap().mapView;
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210 | return new Dimension(mapView.getWidth(), mapView.getHeight());
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211 | } else {
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212 | return GuiHelper.getScreenSize();
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213 | }
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214 | }
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215 |
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216 | private static final int TILE_SIZE_IN_PIXELS = 256;
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217 |
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218 | /**
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219 | * Compute the bounds for a given lat/lon position and the zoom level
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220 | * @param lat The latitude
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221 | * @param lon The longitude
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222 | * @param zoom The current zoom level
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223 | * @return The bounds the OSM server would display
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224 | */
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225 | public static Bounds positionToBounds(final double lat, final double lon, final int zoom) {
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226 | final Dimension screenSize = getScreenSize();
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227 | double scale = (1 << zoom) * TILE_SIZE_IN_PIXELS / (2 * Math.PI * Ellipsoid.WGS84.a);
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228 | double deltaX = screenSize.getWidth() / 2.0 / scale;
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229 | double deltaY = screenSize.getHeight() / 2.0 / scale;
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230 | final Projection mercator = Projections.getProjectionByCode("EPSG:3857");
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231 | final EastNorth projected = mercator.latlon2eastNorth(new LatLon(lat, lon));
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232 | return new Bounds(
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233 | mercator.eastNorth2latlon(projected.add(-deltaX, -deltaY)),
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234 | mercator.eastNorth2latlon(projected.add(deltaX, deltaY)));
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235 | }
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236 |
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237 | /**
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238 | * Return OSM Zoom level for a given area
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239 | *
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240 | * @param b bounds of the area
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241 | * @return matching zoom level for area
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242 | */
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243 | public static int getZoom(Bounds b) {
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244 | final Projection mercator = Projections.getProjectionByCode("EPSG:3857");
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245 | final EastNorth min = mercator.latlon2eastNorth(b.getMin());
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246 | final EastNorth max = mercator.latlon2eastNorth(b.getMax());
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247 | final double deltaX = max.getX() - min.getX();
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248 | final double scale = getScreenSize().getWidth() / deltaX;
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249 | final double x = scale * (2 * Math.PI * Ellipsoid.WGS84.a) / TILE_SIZE_IN_PIXELS;
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250 | return (int) Math.round(Math.log(x) / Math.log(2));
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251 | }
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252 |
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253 | /**
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254 | * Return OSM URL for given area.
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255 | *
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256 | * @param b bounds of the area
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257 | * @return link to display that area in OSM map
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258 | */
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259 | public static String getURL(Bounds b) {
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260 | return getURL(b.getCenter(), getZoom(b));
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261 | }
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262 |
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263 | /**
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264 | * Return OSM URL for given position and zoom.
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265 | *
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266 | * @param pos center position of area
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267 | * @param zoom zoom depth of display
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268 | * @return link to display that area in OSM map
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269 | */
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270 | public static String getURL(LatLon pos, int zoom) {
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271 | return getURL(pos.lat(), pos.lon(), zoom);
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272 | }
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273 |
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274 | /**
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275 | * Return OSM URL for given lat/lon and zoom.
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276 | *
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277 | * @param dlat center latitude of area
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278 | * @param dlon center longitude of area
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279 | * @param zoom zoom depth of display
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280 | * @return link to display that area in OSM map
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281 | *
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282 | * @since 6453
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283 | */
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284 | public static String getURL(double dlat, double dlon, int zoom) {
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285 | // Truncate lat and lon to something more sensible
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286 | int decimals = (int) Math.pow(10, zoom / 3d);
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287 | double lat = Math.round(dlat * decimals);
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288 | lat /= decimals;
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289 | double lon = Math.round(dlon * decimals);
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290 | lon /= decimals;
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291 | return Main.getOSMWebsite() + "/#map="+zoom+'/'+lat+'/'+lon;
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292 | }
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293 | }
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