1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.command;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.trn;
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5 |
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6 | import java.util.Collection;
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7 | import java.util.Objects;
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8 |
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9 | import org.openstreetmap.josm.data.coor.EastNorth;
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10 | import org.openstreetmap.josm.data.osm.Node;
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11 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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12 |
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13 | /**
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14 | * RotateCommand rotates a number of objects around their centre.
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15 | *
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16 | * @author Frederik Ramm
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17 | */
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18 | public class RotateCommand extends TransformNodesCommand {
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19 |
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20 | /**
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21 | * Pivot point
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22 | */
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23 | private final EastNorth pivot;
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24 |
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25 | /**
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26 | * angle of rotation starting click to pivot
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27 | */
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28 | private final double startAngle;
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29 |
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30 | /**
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31 | * computed rotation angle between starting click and current mouse pos
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32 | */
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33 | private double rotationAngle;
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34 |
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35 | /**
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36 | * Creates a RotateCommand.
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37 | * Assign the initial object set, compute pivot point and inital rotation angle.
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38 | * @param objects objects to fetch nodes from
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39 | * @param currentEN cuurent eats/north
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40 | */
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41 | public RotateCommand(Collection<? extends OsmPrimitive> objects, EastNorth currentEN) {
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42 | super(objects);
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43 |
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44 | pivot = getNodesCenter();
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45 | startAngle = getAngle(currentEN);
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46 | rotationAngle = 0.0;
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47 |
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48 | handleEvent(currentEN);
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49 | }
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50 |
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51 | /**
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52 | * Get angle between the horizontal axis and the line formed by the pivot and given point.
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53 | * @param currentEN cuurent eats/north
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54 | * @return angle between the horizontal axis and the line formed by the pivot and given point
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55 | **/
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56 | protected final double getAngle(EastNorth currentEN) {
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57 | if (pivot == null)
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58 | return 0.0; // should never happen by contract
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59 | return Math.atan2(currentEN.east()-pivot.east(), currentEN.north()-pivot.north());
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60 | }
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61 |
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62 | /**
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63 | * Compute new rotation angle and transform nodes accordingly.
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64 | */
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65 | @Override
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66 | public final void handleEvent(EastNorth currentEN) {
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67 | double currentAngle = getAngle(currentEN);
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68 | rotationAngle = currentAngle - startAngle;
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69 | transformNodes();
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70 | }
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71 |
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72 | /**
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73 | * Set the rotation angle.
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74 | * @param rotationAngle The rotate angle
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75 | */
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76 | protected void setRotationAngle(double rotationAngle) {
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77 | this.rotationAngle = rotationAngle;
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78 | }
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79 |
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80 | /**
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81 | * Rotate nodes.
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82 | */
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83 | @Override
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84 | protected void transformNodes() {
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85 | double cosPhi = Math.cos(rotationAngle);
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86 | double sinPhi = Math.sin(rotationAngle);
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87 | for (Node n : nodes) {
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88 | EastNorth oldEastNorth = oldStates.get(n).getEastNorth();
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89 | double x = oldEastNorth.east() - pivot.east();
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90 | double y = oldEastNorth.north() - pivot.north();
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91 | // CHECKSTYLE.OFF: SingleSpaceSeparator
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92 | double nx = cosPhi * x + sinPhi * y + pivot.east();
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93 | double ny = -sinPhi * x + cosPhi * y + pivot.north();
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94 | // CHECKSTYLE.ON: SingleSpaceSeparator
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95 | n.setEastNorth(new EastNorth(nx, ny));
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96 | }
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97 | }
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98 |
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99 | @Override
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100 | public String getDescriptionText() {
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101 | return trn("Rotate {0} node", "Rotate {0} nodes", nodes.size(), nodes.size());
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102 | }
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103 |
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104 | @Override
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105 | public int hashCode() {
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106 | return Objects.hash(super.hashCode(), pivot, startAngle, rotationAngle);
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107 | }
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108 |
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109 | @Override
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110 | public boolean equals(Object obj) {
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111 | if (this == obj) return true;
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112 | if (obj == null || getClass() != obj.getClass()) return false;
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113 | if (!super.equals(obj)) return false;
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114 | RotateCommand that = (RotateCommand) obj;
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115 | return Double.compare(that.startAngle, startAngle) == 0 &&
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116 | Double.compare(that.rotationAngle, rotationAngle) == 0 &&
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117 | Objects.equals(pivot, that.pivot);
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118 | }
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119 | }
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