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 |
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8 | import javax.swing.JLabel;
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9 |
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10 | import org.openstreetmap.josm.data.coor.EastNorth;
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11 | import org.openstreetmap.josm.data.osm.Node;
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12 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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13 | import org.openstreetmap.josm.tools.ImageProvider;
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14 |
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15 | /**
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16 | * RotateCommand rotates a number of objects around their centre.
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17 | *
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18 | * @author Frederik Ramm <frederik@remote.org>
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19 | */
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20 | public class RotateCommand extends TransformNodesCommand {
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21 |
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22 | /**
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23 | * Pivot point
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24 | */
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25 | private EastNorth pivot;
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26 |
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27 | /**
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28 | * World position of the mouse when the user started the command.
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29 | *
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30 | */
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31 | EastNorth startEN = null;
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32 |
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33 | /**
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34 | * angle of rotation starting click to pivot
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35 | */
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36 | private double startAngle = 0.0;
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37 |
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38 | /**
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39 | * computed rotation angle between starting click and current mouse pos
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40 | */
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41 | private double rotationAngle = 0.0;
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42 |
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43 | /**
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44 | * Creates a RotateCommand.
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45 | * Assign the initial object set, compute pivot point and inital rotation angle.
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46 | */
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47 | public RotateCommand(Collection<OsmPrimitive> objects, EastNorth currentEN) {
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48 | super(objects);
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49 |
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50 | pivot = getNodesCenter();
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51 |
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52 | // We remember the very first position of the mouse for this action.
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53 | // Note that SelectAction will keep the same ScaleCommand when the user
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54 | // releases the button and presses it again with the same modifiers.
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55 | // The very first point of this operation is stored here.
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56 | startEN = currentEN;
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57 |
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58 | startAngle = getAngle(currentEN);
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59 | rotationAngle = 0.0;
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60 |
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61 | handleEvent(currentEN);
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62 | }
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63 |
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64 | /**
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65 | * Get angle between the horizontal axis and the line formed by the pivot and give points.
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66 | **/
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67 | protected double getAngle(EastNorth currentEN) {
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68 | if ( pivot == null )
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69 | return 0.0; // should never happen by contract
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70 | return Math.atan2(currentEN.east()-pivot.east(), currentEN.north()-pivot.north());
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71 | }
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72 |
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73 | /**
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74 | * Compute new rotation angle and transform nodes accordingly.
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75 | */
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76 | @Override
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77 | public void handleEvent(EastNorth currentEN) {
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78 | double currentAngle = getAngle(currentEN);
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79 | rotationAngle = currentAngle - startAngle;
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80 | transformNodes();
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81 | }
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82 |
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83 | /**
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84 | * Rotate nodes.
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85 | */
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86 | @Override
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87 | protected void transformNodes() {
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88 | for (Node n : nodes) {
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89 | double cosPhi = Math.cos(rotationAngle);
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90 | double sinPhi = Math.sin(rotationAngle);
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91 | EastNorth oldEastNorth = oldStates.get(n).eastNorth;
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92 | double x = oldEastNorth.east() - pivot.east();
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93 | double y = oldEastNorth.north() - pivot.north();
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94 | double nx = cosPhi * x + sinPhi * y + pivot.east();
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95 | double ny = -sinPhi * x + cosPhi * y + pivot.north();
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96 | n.setEastNorth(new EastNorth(nx, ny));
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97 | }
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98 | }
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99 |
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100 | @Override
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101 | public JLabel getDescription() {
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102 | return new JLabel(trn("Rotate {0} node", "Rotate {0} nodes", nodes.size(), nodes.size()), ImageProvider.get("data", "node"), JLabel.HORIZONTAL);
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103 | }
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104 | }
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