1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.data.coor;
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3 |
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4 |
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5 | import static org.openstreetmap.josm.tools.I18n.tr;
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6 |
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7 | import java.text.DecimalFormat;
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8 | import java.text.NumberFormat;
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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.projection.Projection;
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13 |
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14 | /**
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15 | * LatLon are unprojected latitude / longitude coordinates.
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16 | *
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17 | * This class is immutable.
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18 | *
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19 | * @author Imi
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20 | */
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21 | public class LatLon extends Coordinate {
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22 |
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23 | private static DecimalFormat cDmsMinuteFormatter = new DecimalFormat("00");
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24 | private static DecimalFormat cDmsSecondFormatter = new DecimalFormat("00.0");
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25 | private static DecimalFormat cDdFormatter = new DecimalFormat("###0.0000");
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26 |
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27 |
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28 | public static String dms(double pCoordinate) {
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29 |
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30 | double tAbsCoord = Math.abs(pCoordinate);
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31 | int tDegree = (int) tAbsCoord;
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32 | double tTmpMinutes = (tAbsCoord - tDegree) * 60;
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33 | int tMinutes = (int) tTmpMinutes;
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34 | double tSeconds = (tTmpMinutes - tMinutes) * 60;
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35 |
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36 | return tDegree + "\u00B0" + cDmsMinuteFormatter.format(tMinutes) + "\'"
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37 | + cDmsSecondFormatter.format(tSeconds) + "\"";
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38 | }
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39 |
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40 | public LatLon(double lat, double lon) {
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41 | super(lon, lat);
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42 | }
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43 |
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44 | public LatLon(LatLon coor) {
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45 | super(coor.lon(), coor.lat());
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46 | }
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47 |
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48 | public double lat() {
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49 | return y;
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50 | }
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51 |
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52 | public String latToString(CoordinateFormat d) {
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53 | switch(d) {
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54 | case DECIMAL_DEGREES: return cDdFormatter.format(y);
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55 | case DEGREES_MINUTES_SECONDS: return dms(y) + ((y < 0) ?
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56 | /* short symbol for South */ tr("S") :
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57 | /* short symbol for North */ tr("N"));
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58 | default: return "ERR";
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59 | }
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60 | }
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61 |
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62 | public double lon() {
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63 | return x;
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64 | }
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65 |
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66 | public String lonToString(CoordinateFormat d) {
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67 | switch(d) {
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68 | case DECIMAL_DEGREES: return cDdFormatter.format(x);
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69 | case DEGREES_MINUTES_SECONDS: return dms(x) + ((x < 0) ?
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70 | /* short symbol for West */ tr("W") :
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71 | /* short symbol for East */ tr("E"));
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72 | default: return "ERR";
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73 | }
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74 | }
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75 |
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76 | /**
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77 | * @return <code>true</code> if the other point has almost the same lat/lon
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78 | * values, only differing by no more than
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79 | * 1 / {@link org.openstreetmap.josm.data.projection.Projection#MAX_SERVER_PRECISION MAX_SERVER_PRECISION}.
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80 | */
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81 | public boolean equalsEpsilon(LatLon other) {
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82 | final double p = 1/Projection.MAX_SERVER_PRECISION;
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83 | return Math.abs(lat()-other.lat()) <= p && Math.abs(lon()-other.lon()) <= p;
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84 | }
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85 |
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86 | /**
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87 | * @return <code>true</code>, if the coordinate is outside the world, compared
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88 | * by using lat/lon.
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89 | */
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90 | public boolean isOutSideWorld() {
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91 | Bounds b = Main.proj.getWorldBoundsLatLon();
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92 | return lat() < b.min.lat() || lat() > b.max.lat() ||
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93 | lon() < b.min.lon() || lon() > b.max.lon();
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94 | }
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95 |
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96 | /**
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97 | * @return <code>true</code> if this is within the given bounding box.
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98 | */
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99 | public boolean isWithin(Bounds b) {
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100 | return lat() >= b.min.lat() && lat() <= b.max.lat() && lon() > b.min.lon() && lon() < b.max.lon();
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101 | }
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102 |
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103 | /**
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104 | * Computes the distance between this lat/lon and another point on the earth.
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105 | * Uses spherical law of cosines formula, not Haversine.
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106 | * @param other the other point.
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107 | * @return distance in metres.
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108 | */
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109 | public double greatCircleDistance(LatLon other) {
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110 | return (Math.acos(
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111 | Math.sin(Math.toRadians(lat())) * Math.sin(Math.toRadians(other.lat())) +
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112 | Math.cos(Math.toRadians(lat()))*Math.cos(Math.toRadians(other.lat())) *
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113 | Math.cos(Math.toRadians(other.lon()-lon()))) * 6378135);
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114 | }
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115 |
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116 | /**
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117 | * Returns the heading, in radians, that you have to use to get from
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118 | * this lat/lon to another.
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119 | *
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120 | * @param other the "destination" position
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121 | * @return heading
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122 | */
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123 | public double heading(LatLon other) {
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124 | double rv;
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125 | if (other.lat() == lat()) {
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126 | rv = (other.lon()>lon() ? Math.PI / 2 : Math.PI * 3 / 2);
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127 | } else {
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128 | rv = Math.atan((other.lon()-lon())/(other.lat()-lat()));
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129 | if (rv < 0) {
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130 | rv += Math.PI;
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131 | }
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132 | if (other.lon() < lon()) {
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133 | rv += Math.PI;
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134 | }
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135 | }
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136 | return rv;
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137 | }
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138 |
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139 | /**
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140 | * Returns this lat/lon pair in human-readable format.
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141 | *
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142 | * @return String in the format "lat=1.23456°, lon=2.34567°"
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143 | */
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144 | public String toDisplayString() {
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145 | NumberFormat nf = NumberFormat.getInstance();
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146 | nf.setMaximumFractionDigits(5);
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147 | return "lat=" + nf.format(lat()) + "\u00B0, lon=" + nf.format(lon()) + "\u00B0";
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148 | }
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149 |
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150 | public LatLon interpolate(LatLon ll2, double proportion) {
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151 | return new LatLon(this.lat() + proportion * (ll2.lat() - this.lat()),
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152 | this.lon() + proportion * (ll2.lon() - this.lon()));
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153 | }
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154 |
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155 | public LatLon getCenter(LatLon ll2) {
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156 | return new LatLon((this.lat() + ll2.lat())/2.0, (this.lon() + ll2.lon())/2.0);
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157 | }
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158 |
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159 | @Override public String toString() {
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160 | return "LatLon[lat="+lat()+",lon="+lon()+"]";
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161 | }
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162 | }
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