1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.coor;
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3 |
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4 | import static java.lang.Math.PI;
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5 | import static java.lang.Math.asin;
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6 | import static java.lang.Math.atan2;
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7 | import static java.lang.Math.cos;
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8 | import static java.lang.Math.sin;
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9 | import static java.lang.Math.sqrt;
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10 | import static org.openstreetmap.josm.data.projection.Ellipsoid.WGS84;
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11 | import static org.openstreetmap.josm.tools.I18n.trc;
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12 | import static org.openstreetmap.josm.tools.Utils.toRadians;
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13 |
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14 | import java.awt.geom.Area;
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15 | import java.text.DecimalFormat;
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16 | import java.text.NumberFormat;
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17 | import java.util.Arrays;
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18 | import java.util.Locale;
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19 | import java.util.Objects;
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20 |
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21 | import org.openstreetmap.josm.Main;
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22 | import org.openstreetmap.josm.data.Bounds;
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23 | import org.openstreetmap.josm.data.coor.conversion.DMSCoordinateFormat;
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24 | import org.openstreetmap.josm.data.coor.conversion.DecimalDegreesCoordinateFormat;
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25 | import org.openstreetmap.josm.data.coor.conversion.LatLonParser;
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26 | import org.openstreetmap.josm.data.coor.conversion.NauticalCoordinateFormat;
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27 | import org.openstreetmap.josm.tools.Logging;
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28 | import org.openstreetmap.josm.tools.Utils;
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29 |
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30 | /**
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31 | * LatLon are unprojected latitude / longitude coordinates.
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32 | * <br>
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33 | * <b>Latitude</b> specifies the north-south position in degrees
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34 | * where valid values are in the [-90,90] and positive values specify positions north of the equator.
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35 | * <br>
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36 | * <b>Longitude</b> specifies the east-west position in degrees
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37 | * where valid values are in the [-180,180] and positive values specify positions east of the prime meridian.
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38 | * <br>
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39 | * <img alt="lat/lon" src="https://upload.wikimedia.org/wikipedia/commons/6/62/Latitude_and_Longitude_of_the_Earth.svg">
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40 | * <br>
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41 | * This class is immutable.
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42 | *
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43 | * @author Imi
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44 | */
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45 | public class LatLon extends Coordinate implements ILatLon {
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46 |
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47 | private static final long serialVersionUID = 1L;
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48 |
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49 | /**
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50 | * Minimum difference in location to not be represented as the same position.
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51 | * The API returns 7 decimals.
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52 | */
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53 | public static final double MAX_SERVER_PRECISION = 1e-7;
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54 | /**
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55 | * The inverse of the server precision
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56 | * @see #MAX_SERVER_PRECISION
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57 | */
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58 | public static final double MAX_SERVER_INV_PRECISION = 1e7;
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59 |
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60 | /**
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61 | * The (0,0) coordinates.
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62 | * @since 6178
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63 | */
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64 | public static final LatLon ZERO = new LatLon(0, 0);
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65 |
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66 | /** North pole. */
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67 | public static final LatLon NORTH_POLE = new LatLon(90, 0);
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68 | /** South pole. */
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69 | public static final LatLon SOUTH_POLE = new LatLon(-90, 0);
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70 |
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71 | /**
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72 | * The normal number format for server precision coordinates
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73 | */
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74 | public static final DecimalFormat cDdFormatter;
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75 | /**
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76 | * The number format used for high precision coordinates
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77 | */
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78 | public static final DecimalFormat cDdHighPecisionFormatter;
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79 | static {
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80 | // Don't use the localized decimal separator. This way we can present
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81 | // a comma separated list of coordinates.
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82 | cDdFormatter = (DecimalFormat) NumberFormat.getInstance(Locale.UK);
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83 | cDdFormatter.applyPattern("###0.0######");
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84 | cDdHighPecisionFormatter = (DecimalFormat) NumberFormat.getInstance(Locale.UK);
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85 | cDdHighPecisionFormatter.applyPattern("###0.0##########");
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86 | }
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87 |
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88 | /**
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89 | * Character denoting South, as string.
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90 | * @deprecated use {@link LatLonParser#SOUTH}
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91 | */
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92 | @Deprecated
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93 | public static final String SOUTH = trc("compass", "S");
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94 | /**
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95 | * Character denoting North, as string.
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96 | * @deprecated use {@link LatLonParser#NORTH}
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97 | */
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98 | @Deprecated
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99 | public static final String NORTH = trc("compass", "N");
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100 | /**
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101 | * Character denoting West, as string.
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102 | * @deprecated use {@link LatLonParser#WEST}
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103 | */
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104 | @Deprecated
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105 | public static final String WEST = trc("compass", "W");
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106 | /**
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107 | * Character denoting East, as string.
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108 | * @deprecated use {@link LatLonParser#EAST}
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109 | */
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110 | @Deprecated
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111 | public static final String EAST = trc("compass", "E");
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112 |
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113 | /**
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114 | * Replies true if lat is in the range [-90,90]
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115 | *
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116 | * @param lat the latitude
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117 | * @return true if lat is in the range [-90,90]
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118 | */
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119 | public static boolean isValidLat(double lat) {
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120 | return lat >= -90d && lat <= 90d;
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121 | }
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122 |
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123 | /**
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124 | * Replies true if lon is in the range [-180,180]
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125 | *
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126 | * @param lon the longitude
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127 | * @return true if lon is in the range [-180,180]
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128 | */
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129 | public static boolean isValidLon(double lon) {
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130 | return lon >= -180d && lon <= 180d;
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131 | }
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132 |
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133 | /**
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134 | * Make sure longitude value is within <code>[-180, 180]</code> range.
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135 | * @param lon the longitude in degrees
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136 | * @return lon plus/minus multiples of <code>360</code>, as needed to get
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137 | * in <code>[-180, 180]</code> range
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138 | */
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139 | public static double normalizeLon(double lon) {
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140 | if (lon >= -180 && lon <= 180)
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141 | return lon;
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142 | else {
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143 | lon = lon % 360.0;
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144 | if (lon > 180) {
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145 | return lon - 360;
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146 | } else if (lon < -180) {
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147 | return lon + 360;
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148 | }
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149 | return lon;
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150 | }
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151 | }
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152 |
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153 | /**
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154 | * Replies true if lat is in the range [-90,90] and lon is in the range [-180,180]
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155 | *
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156 | * @return true if lat is in the range [-90,90] and lon is in the range [-180,180]
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157 | */
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158 | public boolean isValid() {
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159 | return isValidLat(lat()) && isValidLon(lon());
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160 | }
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161 |
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162 | /**
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163 | * Clamp the lat value to be inside the world.
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164 | * @param value The value
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165 | * @return The value clamped to the world.
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166 | */
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167 | public static double toIntervalLat(double value) {
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168 | return Utils.clamp(value, -90, 90);
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169 | }
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170 |
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171 | /**
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172 | * Returns a valid OSM longitude [-180,+180] for the given extended longitude value.
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173 | * For example, a value of -181 will return +179, a value of +181 will return -179.
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174 | * @param value A longitude value not restricted to the [-180,+180] range.
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175 | * @return a valid OSM longitude [-180,+180]
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176 | */
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177 | public static double toIntervalLon(double value) {
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178 | if (isValidLon(value))
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179 | return value;
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180 | else {
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181 | int n = (int) (value + Math.signum(value)*180.0) / 360;
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182 | return value - n*360.0;
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183 | }
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184 | }
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185 |
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186 | /**
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187 | * Replies the coordinate in degrees/minutes/seconds format
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188 | * @param pCoordinate The coordinate to convert
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189 | * @return The coordinate in degrees/minutes/seconds format
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190 | * @deprecated use {@link #degreesMinutesSeconds} instead
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191 | */
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192 | @Deprecated
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193 | public static String dms(double pCoordinate) {
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194 | return degreesMinutesSeconds(pCoordinate);
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195 | }
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196 |
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197 | /**
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198 | * Replies the coordinate in degrees/minutes/seconds format
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199 | * @param pCoordinate The coordinate to convert
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200 | * @return The coordinate in degrees/minutes/seconds format
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201 | * @since 12561
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202 | * @deprecated use {@link DMSCoordinateFormat#degreesMinutesSeconds(double)}
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203 | */
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204 | @Deprecated
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205 | public static String degreesMinutesSeconds(double pCoordinate) {
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206 | return DMSCoordinateFormat.degreesMinutesSeconds(pCoordinate);
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207 | }
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208 |
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209 | /**
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210 | * Replies the coordinate in degrees/minutes format
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211 | * @param pCoordinate The coordinate to convert
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212 | * @return The coordinate in degrees/minutes format
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213 | * @since 12537
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214 | * @deprecated use {@link NauticalCoordinateFormat#degreesMinutes(double)}
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215 | */
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216 | @Deprecated
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217 | public static String degreesMinutes(double pCoordinate) {
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218 | return NauticalCoordinateFormat.degreesMinutes(pCoordinate);
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219 | }
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220 |
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221 | /**
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222 | * Replies the coordinate in degrees/minutes format
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223 | * @param pCoordinate The coordinate to convert
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224 | * @return The coordinate in degrees/minutes format
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225 | * @deprecated use {@link #degreesMinutes(double)} instead
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226 | */
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227 | @Deprecated
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228 | public static String dm(double pCoordinate) {
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229 | return degreesMinutes(pCoordinate);
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230 | }
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231 |
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232 | /**
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233 | * Constructs a new object representing the given latitude/longitude.
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234 | * @param lat the latitude, i.e., the north-south position in degrees
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235 | * @param lon the longitude, i.e., the east-west position in degrees
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236 | */
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237 | public LatLon(double lat, double lon) {
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238 | super(lon, lat);
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239 | }
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240 |
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241 | /**
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242 | * Creates a new LatLon object for the given coordinate
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243 | * @param coor The coordinates to copy from.
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244 | */
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245 | public LatLon(ILatLon coor) {
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246 | super(coor.lon(), coor.lat());
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247 | }
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248 |
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249 | @Override
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250 | public double lat() {
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251 | return y;
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252 | }
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253 |
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254 | /**
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255 | * Formats the latitude part according to the given format
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256 | * @param d the coordinate format to use
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257 | * @return the formatted latitude
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258 | * @deprecated use {@link org.openstreetmap.josm.data.coor.conversion.ICoordinateFormat#latToString(ILatLon)}
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259 | */
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260 | @Deprecated
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261 | public String latToString(CoordinateFormat d) {
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262 | return d.getICoordinateFormat().latToString(this);
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263 | }
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264 |
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265 | @Override
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266 | public double lon() {
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267 | return x;
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268 | }
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269 |
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270 | /**
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271 | * Formats the longitude part according to the given format
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272 | * @param d the coordinate format to use
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273 | * @return the formatted longitude
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274 | * @deprecated use {@link org.openstreetmap.josm.data.coor.conversion.ICoordinateFormat#lonToString(ILatLon)}
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275 | */
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276 | @Deprecated
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277 | public String lonToString(CoordinateFormat d) {
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278 | return d.getICoordinateFormat().lonToString(this);
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279 | }
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280 |
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281 | /**
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282 | * @param other other lat/lon
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283 | * @return <code>true</code> if the other point has almost the same lat/lon
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284 | * values, only differing by no more than 1 / {@link #MAX_SERVER_PRECISION MAX_SERVER_PRECISION}.
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285 | */
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286 | public boolean equalsEpsilon(LatLon other) {
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287 | double p = MAX_SERVER_PRECISION / 2;
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288 | return Math.abs(lat()-other.lat()) <= p && Math.abs(lon()-other.lon()) <= p;
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289 | }
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290 |
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291 | /**
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292 | * Determines if this lat/lon is outside of the world
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293 | * @return <code>true</code>, if the coordinate is outside the world, compared by using lat/lon.
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294 | */
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295 | public boolean isOutSideWorld() {
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296 | Bounds b = Main.getProjection().getWorldBoundsLatLon();
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297 | return lat() < b.getMinLat() || lat() > b.getMaxLat() ||
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298 | lon() < b.getMinLon() || lon() > b.getMaxLon();
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299 | }
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300 |
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301 | /**
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302 | * Determines if this lat/lon is within the given bounding box.
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303 | * @param b bounding box
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304 | * @return <code>true</code> if this is within the given bounding box.
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305 | */
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306 | public boolean isWithin(Bounds b) {
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307 | return b.contains(this);
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308 | }
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309 |
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310 | /**
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311 | * Check if this is contained in given area or area is null.
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312 | *
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313 | * @param a Area
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314 | * @return <code>true</code> if this is contained in given area or area is null.
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315 | */
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316 | public boolean isIn(Area a) {
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317 | return a == null || a.contains(x, y);
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318 | }
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319 |
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320 | /**
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321 | * Computes the distance between this lat/lon and another point on the earth.
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322 | * Uses Haversine formular.
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323 | * @param other the other point.
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324 | * @return distance in metres.
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325 | */
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326 | public double greatCircleDistance(LatLon other) {
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327 | double sinHalfLat = sin(toRadians(other.lat() - this.lat()) / 2);
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328 | double sinHalfLon = sin(toRadians(other.lon() - this.lon()) / 2);
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329 | double d = 2 * WGS84.a * asin(
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330 | sqrt(sinHalfLat*sinHalfLat +
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331 | cos(toRadians(this.lat()))*cos(toRadians(other.lat()))*sinHalfLon*sinHalfLon));
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332 | // For points opposite to each other on the sphere,
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333 | // rounding errors could make the argument of asin greater than 1
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334 | // (This should almost never happen.)
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335 | if (java.lang.Double.isNaN(d)) {
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336 | Logging.error("NaN in greatCircleDistance");
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337 | d = PI * WGS84.a;
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338 | }
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339 | return d;
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340 | }
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341 |
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342 | /**
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343 | * Returns the heading that you have to use to get from this lat/lon to another.
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344 | *
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345 | * Angle starts from north and increases counterclockwise (!), PI/2 means west.
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346 | * You can get usual clockwise angle from {@link #bearing(LatLon)} method.
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347 | * This method is kept as deprecated because it is called from many plugins.
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348 | *
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349 | * (I don't know the original source of this formula, but see
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350 | * <a href="https://math.stackexchange.com/questions/720/how-to-calculate-a-heading-on-the-earths-surface">this question</a>
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351 | * for some hints how it is derived.)
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352 | *
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353 | * @deprecated see bearing method
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354 | * @param other the "destination" position
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355 | * @return heading in radians in the range 0 <= hd < 2*PI
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356 | */
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357 | @Deprecated
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358 | public double heading(LatLon other) {
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359 | double hd = atan2(sin(toRadians(this.lon() - other.lon())) * cos(toRadians(other.lat())),
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360 | cos(toRadians(this.lat())) * sin(toRadians(other.lat())) -
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361 | sin(toRadians(this.lat())) * cos(toRadians(other.lat())) * cos(toRadians(this.lon() - other.lon())));
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362 | hd %= 2 * PI;
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363 | if (hd < 0) {
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364 | hd += 2 * PI;
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365 | }
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366 | return hd;
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367 | }
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368 |
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369 | /**
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370 | * Returns bearing from this point to another.
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371 | *
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372 | * Angle starts from north and increases clockwise, PI/2 means east.
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373 | * Old deprecated method {@link #heading(LatLon)} used unusual reverse angle.
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374 | *
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375 | * Please note that reverse bearing (from other point to this point) should NOT be
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376 | * calculated from return value of this method, because great circle path
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377 | * between the two points have different bearings at each position.
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378 | *
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379 | * To get bearing from another point to this point call other.bearing(this)
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380 | *
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381 | * @param other the "destination" position
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382 | * @return heading in radians in the range 0 <= hd < 2*PI
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383 | */
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384 | public double bearing(LatLon other) {
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385 | double lat1 = toRadians(this.lat());
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386 | double lat2 = toRadians(other.lat());
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387 | double dlon = toRadians(other.lon() - this.lon());
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388 | double bearing = atan2(
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389 | sin(dlon) * cos(lat2),
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390 | cos(lat1) * sin(lat2) - sin(lat1) * cos(lat2) * cos(dlon)
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391 | );
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392 | bearing %= 2 * PI;
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393 | if (bearing < 0) {
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394 | bearing += 2 * PI;
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395 | }
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396 | return bearing;
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397 | }
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398 |
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399 | /**
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400 | * Returns this lat/lon pair in human-readable format.
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401 | *
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402 | * @return String in the format "lat=1.23456 deg, lon=2.34567 deg"
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403 | */
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404 | public String toDisplayString() {
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405 | NumberFormat nf = NumberFormat.getInstance();
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406 | nf.setMaximumFractionDigits(5);
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407 | return "lat=" + nf.format(lat()) + "\u00B0, lon=" + nf.format(lon()) + '\u00B0';
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408 | }
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409 |
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410 | /**
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411 | * Returns this lat/lon pair in human-readable format separated by {@code separator}.
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412 | * @param separator values separator
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413 | * @return String in the format {@code "1.23456[separator]2.34567"}
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414 | * @deprecated method removed without replacement
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415 | */
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416 | @Deprecated
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417 | public String toStringCSV(String separator) {
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418 | return Utils.join(separator, Arrays.asList(
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419 | DecimalDegreesCoordinateFormat.INSTANCE.latToString(this),
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420 | DecimalDegreesCoordinateFormat.INSTANCE.lonToString(this)
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421 | ));
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422 | }
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423 |
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424 | /**
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425 | * Interpolate between this and a other latlon
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426 | * @param ll2 The other lat/lon object
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427 | * @param proportion The proportion to interpolate
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428 | * @return a new latlon at this position if proportion is 0, at the other position it proportion is 1 and lineary interpolated otherwise.
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429 | */
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430 | public LatLon interpolate(LatLon ll2, double proportion) {
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431 | // this is an alternate form of this.lat() + proportion * (ll2.lat() - this.lat()) that is slightly faster
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432 | return new LatLon((1 - proportion) * this.lat() + proportion * ll2.lat(),
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433 | (1 - proportion) * this.lon() + proportion * ll2.lon());
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434 | }
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435 |
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436 | /**
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437 | * Get the center between two lat/lon points
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438 | * @param ll2 The other {@link LatLon}
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439 | * @return The center at the average coordinates of the two points. Does not take the 180° meridian into account.
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440 | */
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441 | public LatLon getCenter(LatLon ll2) {
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442 | // The JIT will inline this for us, it is as fast as the normal /2 approach
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443 | return interpolate(ll2, .5);
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444 | }
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445 |
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446 | /**
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447 | * Returns the euclidean distance from this {@code LatLon} to a specified {@code LatLon}.
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448 | *
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449 | * @param ll the specified coordinate to be measured against this {@code LatLon}
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450 | * @return the euclidean distance from this {@code LatLon} to a specified {@code LatLon}
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451 | * @since 6166
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452 | */
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453 | public double distance(final LatLon ll) {
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454 | return super.distance(ll);
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455 | }
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456 |
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457 | /**
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458 | * Returns the square of the euclidean distance from this {@code LatLon} to a specified {@code LatLon}.
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459 | *
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460 | * @param ll the specified coordinate to be measured against this {@code LatLon}
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461 | * @return the square of the euclidean distance from this {@code LatLon} to a specified {@code LatLon}
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462 | * @since 6166
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463 | */
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464 | public double distanceSq(final LatLon ll) {
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465 | return super.distanceSq(ll);
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466 | }
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467 |
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468 | @Override
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469 | public String toString() {
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470 | return "LatLon[lat="+lat()+",lon="+lon()+']';
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471 | }
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472 |
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473 | /**
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474 | * Returns the value rounded to OSM precisions, i.e. to {@link #MAX_SERVER_PRECISION}.
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475 | * @param value lat/lon value
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476 | *
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477 | * @return rounded value
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478 | */
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479 | public static double roundToOsmPrecision(double value) {
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480 | return Math.round(value * MAX_SERVER_INV_PRECISION) / MAX_SERVER_INV_PRECISION;
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481 | }
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482 |
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483 | /**
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484 | * Replies a clone of this lat LatLon, rounded to OSM precisions, i.e. to {@link #MAX_SERVER_PRECISION}
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485 | *
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486 | * @return a clone of this lat LatLon
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487 | */
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488 | public LatLon getRoundedToOsmPrecision() {
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489 | return new LatLon(
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490 | roundToOsmPrecision(lat()),
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491 | roundToOsmPrecision(lon())
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492 | );
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493 | }
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494 |
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495 | @Override
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496 | public int hashCode() {
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497 | return Objects.hash(x, y);
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498 | }
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499 |
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500 | @Override
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501 | public boolean equals(Object obj) {
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502 | if (this == obj) return true;
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503 | if (obj == null || getClass() != obj.getClass()) return false;
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504 | LatLon that = (LatLon) obj;
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505 | return Double.compare(that.x, x) == 0 &&
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506 | Double.compare(that.y, y) == 0;
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507 | }
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508 |
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509 | /**
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510 | * Parses the given string as lat/lon.
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511 | * @param coord String to parse
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512 | * @return parsed lat/lon
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513 | * @since 11045
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514 | * @deprecated use {@link LatLonParser#parse(java.lang.String)}
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515 | */
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516 | @Deprecated
|
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517 | public static LatLon parse(String coord) {
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518 | return LatLonParser.parse(coord);
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519 | }
|
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520 | }
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