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 | public class ScaleCommand extends TransformNodesCommand {
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14 | /**
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15 | * Pivot point
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16 | */
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17 | private final EastNorth pivot;
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18 |
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19 | /**
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20 | * Current scaling factor applied
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21 | */
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22 | private double scalingFactor;
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23 |
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24 | /**
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25 | * World position of the mouse when the user started the command.
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26 | */
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27 | private final EastNorth startEN;
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28 |
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29 | /**
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30 | * Creates a ScaleCommand.
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31 | * Assign the initial object set, compute pivot point.
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32 | * Computation of pivot point is done by the same rules that are used in
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33 | * the "align nodes in circle" action.
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34 | * @param objects objects to fetch nodes from
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35 | * @param currentEN cuurent eats/north
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36 | */
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37 | public ScaleCommand(Collection<OsmPrimitive> objects, EastNorth currentEN) {
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38 | super(objects);
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39 |
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40 | pivot = getNodesCenter();
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41 |
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42 | // We remember the very first position of the mouse for this action.
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43 | // Note that SelectAction will keep the same ScaleCommand when the user
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44 | // releases the button and presses it again with the same modifiers.
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45 | // The very first point of this operation is stored here.
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46 | startEN = currentEN;
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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 | * Compute new scaling factor and transform nodes accordingly.
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53 | */
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54 | @Override
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55 | public final void handleEvent(EastNorth currentEN) {
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56 | double startAngle = Math.atan2(startEN.east()-pivot.east(), startEN.north()-pivot.north());
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57 | double endAngle = Math.atan2(currentEN.east()-pivot.east(), currentEN.north()-pivot.north());
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58 | double startDistance = pivot.distance(startEN);
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59 | double currentDistance = pivot.distance(currentEN);
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60 | scalingFactor = Math.cos(startAngle-endAngle) * currentDistance / startDistance;
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61 | transformNodes();
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62 | }
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63 |
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64 | /**
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65 | * Scale nodes.
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66 | */
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67 | @Override
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68 | protected void transformNodes() {
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69 | for (Node n : nodes) {
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70 | EastNorth oldEastNorth = oldStates.get(n).getEastNorth();
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71 | double dx = oldEastNorth.east() - pivot.east();
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72 | double dy = oldEastNorth.north() - pivot.north();
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73 | double nx = pivot.east() + scalingFactor * dx;
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74 | double ny = pivot.north() + scalingFactor * dy;
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75 | n.setEastNorth(new EastNorth(nx, ny));
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76 | }
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77 | }
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78 |
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79 | @Override
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80 | public String getDescriptionText() {
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81 | return trn("Scale {0} node", "Scale {0} nodes", nodes.size(), nodes.size());
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82 | }
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83 |
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84 | @Override
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85 | public int hashCode() {
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86 | return Objects.hash(super.hashCode(), pivot, scalingFactor, startEN);
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87 | }
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88 |
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89 | @Override
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90 | public boolean equals(Object obj) {
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91 | if (this == obj) return true;
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92 | if (obj == null || getClass() != obj.getClass()) return false;
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93 | if (!super.equals(obj)) return false;
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94 | ScaleCommand that = (ScaleCommand) obj;
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95 | return Double.compare(that.scalingFactor, scalingFactor) == 0 &&
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96 | Objects.equals(pivot, that.pivot) &&
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97 | Objects.equals(startEN, that.startEN);
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98 | }
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99 | }
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