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 java.io.Serializable;
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5 | import java.util.Objects;
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6 |
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7 | /**
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8 | * Polar coordinate.
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9 | * @since 13107 (extracted from {@code AlignInCircleAction})
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10 | */
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11 | public class PolarCoor implements Serializable {
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12 |
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13 | private static final long serialVersionUID = 1L;
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14 |
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15 | /**
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16 | * Radial coordinate (distance from the pole).
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17 | */
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18 | public final double radius;
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19 |
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20 | /**
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21 | * Angular coordinate in radians.
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22 | */
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23 | public final double angle;
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24 |
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25 | /**
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26 | * Reference point (analogous to the origin of a Cartesian coordinate system).
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27 | */
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28 | public final EastNorth pole;
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29 |
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30 | /**
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31 | * Constructs a new {@code PolarCoor}, using {@code (0,0)} as pole.
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32 | * @param radius radial coordinate (distance from the pole)
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33 | * @param angle angular coordinate in radians
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34 | */
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35 | public PolarCoor(double radius, double angle) {
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36 | this(radius, angle, new EastNorth(0, 0));
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37 | }
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38 |
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39 | /**
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40 | * Constructs a new {@code PolarCoor}.
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41 | * @param radius radial coordinate (distance from the pole)
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42 | * @param angle angular coordinate in radians
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43 | * @param pole reference point (analogous to the origin of a Cartesian coordinate system)
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44 | */
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45 | public PolarCoor(double radius, double angle, EastNorth pole) {
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46 | this.radius = radius;
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47 | this.angle = angle;
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48 | this.pole = pole;
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49 | }
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50 |
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51 | /**
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52 | * Constructs a new {@code PolarCoor} from an {@link EastNorth}, using {@code (0,0)} as pole.
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53 | * @param en east/north coordinates
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54 | */
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55 | public PolarCoor(EastNorth en) {
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56 | this(en, new EastNorth(0, 0));
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57 | }
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58 |
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59 | /**
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60 | * Constructs a new {@code PolarCoor}.
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61 | * @param en east/north coordinates
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62 | * @param pole reference point (analogous to the origin of a Cartesian coordinate system)
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63 | */
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64 | public PolarCoor(EastNorth en, EastNorth pole) {
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65 | this(en.distance(pole), computeAngle(en, pole), pole);
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66 | }
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67 |
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68 | /**
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69 | * Compute polar angle between an east/north and the pole.
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70 | * @param en east/north coordinates
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71 | * @param pole reference point (analogous to the origin of a Cartesian coordinate system)
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72 | * @return polar angle in radians
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73 | */
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74 | public static double computeAngle(EastNorth en, EastNorth pole) {
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75 | return Math.atan2(en.north() - pole.north(), en.east() - pole.east());
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76 | }
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77 |
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78 | /**
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79 | * Converts this {@code PolarCoor} to an {@link EastNorth} instance.
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80 | * @return a new {@code EastNorth} instance
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81 | */
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82 | public EastNorth toEastNorth() {
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83 | return new EastNorth(
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84 | radius * Math.cos(angle) + pole.east(),
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85 | radius * Math.sin(angle) + pole.north());
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86 | }
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87 |
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88 | @Override
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89 | public int hashCode() {
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90 | return Objects.hash(radius, angle, pole);
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91 | }
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92 |
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93 | @Override
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94 | public boolean equals(Object obj) {
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95 | if (this == obj) return true;
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96 | if (obj == null || getClass() != obj.getClass()) return false;
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97 | PolarCoor that = (PolarCoor) obj;
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98 | return Double.compare(that.radius, radius) == 0 &&
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99 | Double.compare(that.angle, angle) == 0 &&
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100 | Objects.equals(that.pole, pole);
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101 | }
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102 |
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103 | @Override
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104 | public String toString() {
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105 | return "PolarCoor [radius=" + radius + ", angle=" + angle + ", pole=" + pole + ']';
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106 | }
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107 | }
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