1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.util;
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3 |
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4 | import java.util.Locale;
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5 |
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6 | import org.openstreetmap.josm.data.osm.Node;
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7 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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8 | import org.openstreetmap.josm.data.osm.Way;
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9 | import org.openstreetmap.josm.tools.Geometry;
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10 | import org.openstreetmap.josm.tools.SubclassFilteredCollection;
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11 | import org.openstreetmap.josm.tools.Utils;
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12 |
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13 | /**
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14 | * Determines how an icon is to be rotated depending on the primitive to be displayed.
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15 | * @since 8199 (creation)
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16 | * @since 10599 (functional interface)
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17 | */
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18 | @FunctionalInterface
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19 | public interface RotationAngle {
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20 |
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21 | /**
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22 | * Calculates the rotation angle depending on the primitive to be displayed.
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23 | * @param p primitive
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24 | * @return rotation angle
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25 | */
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26 | double getRotationAngle(OsmPrimitive p);
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27 |
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28 | /**
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29 | * Always returns the fixed {@code angle}.
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30 | * @param angle angle
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31 | * @return rotation angle
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32 | */
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33 | static RotationAngle buildStaticRotation(final double angle) {
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34 | return new RotationAngle() {
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35 | @Override
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36 | public double getRotationAngle(OsmPrimitive p) {
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37 | return angle;
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38 | }
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39 |
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40 | @Override
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41 | public String toString() {
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42 | return angle + "rad";
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43 | }
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44 | };
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45 | }
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46 |
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47 | /**
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48 | * Parses the rotation angle from the specified {@code string}.
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49 | * @param string angle as string
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50 | * @return rotation angle
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51 | */
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52 | static RotationAngle buildStaticRotation(final String string) {
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53 | try {
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54 | return buildStaticRotation(parseCardinalRotation(string));
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55 | } catch (IllegalArgumentException e) {
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56 | throw new IllegalArgumentException("Invalid string: " + string, e);
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57 | }
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58 | }
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59 |
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60 | /**
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61 | * Converts an angle diven in cardinal directions to radians.
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62 | * The following values are supported: {@code n}, {@code north}, {@code ne}, {@code northeast},
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63 | * {@code e}, {@code east}, {@code se}, {@code southeast}, {@code s}, {@code south},
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64 | * {@code sw}, {@code southwest}, {@code w}, {@code west}, {@code nw}, {@code northwest}.
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65 | * @param cardinal the angle in cardinal directions
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66 | * @return the angle in radians
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67 | */
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68 | static double parseCardinalRotation(final String cardinal) {
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69 | switch (cardinal.toLowerCase(Locale.ENGLISH)) {
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70 | case "n":
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71 | case "north":
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72 | return 0; // 0 degree => 0 radian
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73 | case "ne":
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74 | case "northeast":
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75 | return Math.toRadians(45);
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76 | case "e":
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77 | case "east":
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78 | return Math.toRadians(90);
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79 | case "se":
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80 | case "southeast":
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81 | return Math.toRadians(135);
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82 | case "s":
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83 | case "south":
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84 | return Math.PI; // 180 degree
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85 | case "sw":
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86 | case "southwest":
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87 | return Math.toRadians(225);
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88 | case "w":
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89 | case "west":
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90 | return Math.toRadians(270);
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91 | case "nw":
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92 | case "northwest":
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93 | return Math.toRadians(315);
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94 | default:
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95 | throw new IllegalArgumentException("Unexpected cardinal direction " + cardinal);
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96 | }
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97 | }
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98 |
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99 | /**
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100 | * Computes the angle depending on the referencing way segment, or {@code 0} if none exists.
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101 | * @return rotation angle
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102 | */
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103 | static RotationAngle buildWayDirectionRotation() {
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104 | return new RotationAngle() {
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105 | @Override
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106 | public double getRotationAngle(OsmPrimitive p) {
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107 | if (!(p instanceof Node)) {
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108 | return 0;
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109 | }
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110 | final Node n = (Node) p;
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111 | final SubclassFilteredCollection<OsmPrimitive, Way> ways = Utils.filteredCollection(n.getReferrers(), Way.class);
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112 | if (ways.isEmpty()) {
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113 | return 0;
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114 | }
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115 | final Way w = ways.iterator().next();
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116 | final int idx = w.getNodes().indexOf(n);
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117 | if (idx == 0) {
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118 | return -Geometry.getSegmentAngle(n.getEastNorth(), w.getNode(idx + 1).getEastNorth());
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119 | } else {
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120 | return -Geometry.getSegmentAngle(w.getNode(idx - 1).getEastNorth(), n.getEastNorth());
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121 | }
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122 | }
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123 |
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124 | @Override
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125 | public String toString() {
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126 | return "way-direction";
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127 | }
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128 | };
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129 | }
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130 | }
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