1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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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.IPrimitive;
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7 | import org.openstreetmap.josm.data.osm.Node;
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8 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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9 | import org.openstreetmap.josm.data.osm.Way;
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10 |
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11 | /**
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12 | * Determines how an icon is to be rotated depending on the primitive to be displayed.
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13 | * @since 8199 (creation)
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14 | * @since 10599 (functional interface)
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15 | * @since 12756 (moved from {@code gui.util} package)
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16 | */
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17 | @FunctionalInterface
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18 | public interface RotationAngle {
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19 |
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20 | /**
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21 | * The rotation along a way.
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22 | */
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23 | final class WayDirectionRotationAngle implements RotationAngle {
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24 | @Override
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25 | public double getRotationAngle(IPrimitive p) {
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26 | if (!(p instanceof Node)) {
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27 | return 0;
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28 | }
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29 | final Node n = (Node) p;
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30 | final SubclassFilteredCollection<OsmPrimitive, Way> ways = Utils.filteredCollection(n.getReferrers(), Way.class);
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31 | if (ways.isEmpty()) {
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32 | return 0;
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33 | }
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34 | final Way w = ways.iterator().next();
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35 | final int idx = w.getNodes().indexOf(n);
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36 | if (idx == 0) {
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37 | return -Geometry.getSegmentAngle(n.getEastNorth(), w.getNode(idx + 1).getEastNorth());
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38 | } else {
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39 | return -Geometry.getSegmentAngle(w.getNode(idx - 1).getEastNorth(), n.getEastNorth());
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40 | }
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41 | }
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42 |
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43 | @Override
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44 | public String toString() {
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45 | return "way-direction";
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46 | }
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47 |
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48 | @Override
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49 | public int hashCode() {
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50 | return 1;
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51 | }
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52 |
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53 | @Override
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54 | public boolean equals(Object obj) {
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55 | if (this == obj) {
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56 | return true;
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57 | }
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58 | return obj != null && getClass() == obj.getClass();
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59 | }
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60 | }
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61 |
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62 | /**
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63 | * A static rotation
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64 | */
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65 | final class StaticRotationAngle implements RotationAngle {
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66 | private final double angle;
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67 |
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68 | private StaticRotationAngle(double angle) {
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69 | this.angle = angle;
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70 | }
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71 |
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72 | @Override
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73 | public double getRotationAngle(IPrimitive p) {
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74 | return angle;
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75 | }
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76 |
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77 | @Override
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78 | public String toString() {
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79 | return angle + "rad";
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80 | }
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81 |
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82 | @Override
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83 | public int hashCode() {
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84 | final int prime = 31;
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85 | int result = 1;
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86 | long temp = Double.doubleToLongBits(angle);
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87 | result = prime * result + (int) (temp ^ (temp >>> 32));
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88 | return result;
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89 | }
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90 |
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91 | @Override
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92 | public boolean equals(Object obj) {
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93 | if (this == obj) {
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94 | return true;
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95 | }
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96 | if (obj == null || getClass() != obj.getClass()) {
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97 | return false;
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98 | }
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99 | StaticRotationAngle other = (StaticRotationAngle) obj;
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100 | return Double.doubleToLongBits(angle) == Double.doubleToLongBits(other.angle);
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101 | }
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102 | }
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103 |
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104 | /**
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105 | * A no-rotation angle that always returns 0.
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106 | * @since 11726
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107 | */
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108 | RotationAngle NO_ROTATION = new StaticRotationAngle(0);
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109 |
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110 | /**
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111 | * Calculates the rotation angle depending on the primitive to be displayed.
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112 | * @param p primitive
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113 | * @return rotation angle
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114 | * @since 13623 (signature)
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115 | */
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116 | double getRotationAngle(IPrimitive p);
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117 |
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118 | /**
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119 | * Always returns the fixed {@code angle}.
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120 | * @param angle angle
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121 | * @return rotation angle
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122 | */
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123 | static RotationAngle buildStaticRotation(final double angle) {
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124 | return new StaticRotationAngle(angle);
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125 | }
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126 |
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127 | /**
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128 | * Parses the rotation angle from the specified {@code string}.
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129 | * @param string angle as string
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130 | * @return rotation angle
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131 | */
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132 | static RotationAngle buildStaticRotation(final String string) {
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133 | try {
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134 | return buildStaticRotation(parseCardinalRotation(string));
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135 | } catch (IllegalArgumentException e) {
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136 | throw new IllegalArgumentException("Invalid string: " + string, e);
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137 | }
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138 | }
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139 |
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140 | /**
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141 | * Converts an angle diven in cardinal directions to radians.
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142 | * The following values are supported: {@code n}, {@code north}, {@code ne}, {@code northeast},
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143 | * {@code e}, {@code east}, {@code se}, {@code southeast}, {@code s}, {@code south},
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144 | * {@code sw}, {@code southwest}, {@code w}, {@code west}, {@code nw}, {@code northwest}.
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145 | * @param cardinal the angle in cardinal directions
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146 | * @return the angle in radians
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147 | */
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148 | static double parseCardinalRotation(final String cardinal) {
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149 | switch (cardinal.toLowerCase(Locale.ENGLISH)) {
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150 | case "n":
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151 | case "north":
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152 | return 0; // 0 degree => 0 radian
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153 | case "ne":
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154 | case "northeast":
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155 | return Utils.toRadians(45);
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156 | case "e":
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157 | case "east":
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158 | return Utils.toRadians(90);
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159 | case "se":
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160 | case "southeast":
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161 | return Utils.toRadians(135);
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162 | case "s":
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163 | case "south":
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164 | return Math.PI; // 180 degree
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165 | case "sw":
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166 | case "southwest":
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167 | return Utils.toRadians(225);
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168 | case "w":
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169 | case "west":
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170 | return Utils.toRadians(270);
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171 | case "nw":
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172 | case "northwest":
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173 | return Utils.toRadians(315);
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174 | default:
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175 | throw new IllegalArgumentException("Unexpected cardinal direction " + cardinal);
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176 | }
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177 | }
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178 |
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179 | /**
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180 | * Computes the angle depending on the referencing way segment, or {@code 0} if none exists.
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181 | * @return rotation angle
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182 | */
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183 | static RotationAngle buildWayDirectionRotation() {
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184 | return new WayDirectionRotationAngle();
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185 | }
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186 | }
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