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 | * Northing, Easting of the projected coordinates.
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6 | *
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7 | * This class is immutable.
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8 | *
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9 | * @author Imi
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10 | */
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11 | public class EastNorth extends Coordinate {
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12 |
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13 | public EastNorth(double east, double north) {
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14 | super(east,north);
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15 | }
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16 |
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17 | public double east() {
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18 | return x;
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19 | }
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20 |
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21 | public double north() {
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22 | return y;
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23 | }
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24 |
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25 | public EastNorth add(double dx, double dy) {
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26 | return new EastNorth(x+dx, y+dy);
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27 | }
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28 |
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29 | public EastNorth add(EastNorth other) {
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30 | return new EastNorth(x+other.x, y+other.y);
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31 | }
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32 |
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33 | public EastNorth scale(double s) {
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34 | return new EastNorth(s * x, s * y);
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35 | }
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36 |
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37 | public EastNorth interpolate(EastNorth en2, double proportion) {
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38 | return new EastNorth(this.x + proportion * (en2.x - this.x),
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39 | this.y + proportion * (en2.y - this.y));
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40 | }
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41 |
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42 | public EastNorth getCenter(EastNorth en2) {
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43 | return new EastNorth((this.x + en2.x)/2.0, (this.y + en2.y)/2.0);
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44 | }
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45 |
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46 | public double distance(EastNorth en2) {
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47 | return Math.sqrt((this.x-en2.x)*(this.x-en2.x) + (this.y-en2.y)*(this.y-en2.y));
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48 | }
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49 |
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50 | /**
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51 | * Returns the heading, in radians, that you have to use to get from
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52 | * this EastNorth to another. Heading is mapped into [0, 2pi)
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53 | *
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54 | * @param other the "destination" position
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55 | * @return heading
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56 | */
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57 | public double heading(EastNorth other) {
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58 | double hd = Math.atan2(other.east() - east(), other.north() - north());
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59 | if(hd < 0) hd = 2 * Math.PI + hd;
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60 | return hd;
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61 | }
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62 |
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63 | /**
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64 | * Replies true if east and north are different from Double.NaN
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65 | *
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66 | * @return true if east and north are different from Double.NaN
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67 | */
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68 | public boolean isValid() {
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69 | return !java.lang.Double.isNaN(x) && !java.lang.Double.isNaN(y);
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70 | }
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71 |
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72 | public EastNorth sub(EastNorth en) {
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73 | return new EastNorth(en.east() - east(), en.north() - north());
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74 | }
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75 |
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76 | /**
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77 | * Returns an EastNorth representing the this EastNorth rotated around
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78 | * a given EastNorth by a given angle
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79 | * @param pivot the center of the rotation
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80 | * @param angle the angle of the rotation
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81 | * @return EastNorth rotated object
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82 | */
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83 | public EastNorth rotate(EastNorth pivot, double angle) {
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84 | double cosPhi = Math.cos(angle);
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85 | double sinPhi = Math.sin(angle);
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86 | double x = east() - pivot.east();
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87 | double y = north() - pivot.north();
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88 | double nx = cosPhi * x + sinPhi * y + pivot.east();
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89 | double ny = -sinPhi * x + cosPhi * y + pivot.north();
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90 | return new EastNorth(nx, ny);
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91 | }
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92 |
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93 | @Override public String toString() {
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94 | return "EastNorth[e="+x+", n="+y+"]";
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95 | }
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96 |
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97 | /**
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98 | * Compares two EastNorth values
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99 | *
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100 | * @return true if "x" and "y" values are within 1E-6 of each other
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101 | */
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102 | public boolean equalsEpsilon(EastNorth other, double e) {
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103 | return (Math.abs(x - other.x) < e && Math.abs(y - other.y) < e);
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104 | }
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105 | }
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