1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.mappaint.styleelement.placement;
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3 |
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4 | import java.awt.Rectangle;
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5 | import java.awt.geom.Rectangle2D;
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6 |
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7 | import org.openstreetmap.josm.gui.MapViewState;
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8 | import org.openstreetmap.josm.gui.draw.MapViewPath;
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9 | import org.openstreetmap.josm.gui.draw.MapViewPositionAndRotation;
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10 |
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11 | /**
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12 | * Places the label / icon so that it is completely inside the area.
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13 | *
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14 | * @author Michael Zangl
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15 | * @since 11722
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16 | * @since 11748 moved to own file
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17 | */
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18 | public class CompletelyInsideAreaStrategy implements PositionForAreaStrategy {
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19 | /**
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20 | * An instance of this class.
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21 | */
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22 | public static final CompletelyInsideAreaStrategy INSTANCE = new CompletelyInsideAreaStrategy();
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23 |
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24 | protected CompletelyInsideAreaStrategy() {
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25 | }
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26 |
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27 | @Override
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28 | public MapViewPositionAndRotation findLabelPlacement(MapViewPath path, Rectangle2D nb) {
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29 | // Using the Centroid is Nicer for buildings like: +--------+
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30 | // but this needs to be fast. As most houses are | 42 |
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31 | // boxes anyway, the center of the bounding box +---++---+
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32 | // will have to do. ++
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33 | // Centroids are not optimal either, just imagine a U-shaped house.
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34 |
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35 | Rectangle pb = path.getBounds();
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36 |
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37 | // quick check to see if label box is smaller than primitive box
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38 | if (pb.width < nb.getWidth() || pb.height < nb.getHeight()) {
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39 | return null;
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40 | }
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41 |
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42 | final double w = pb.width - nb.getWidth();
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43 | final double h = pb.height - nb.getHeight();
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44 |
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45 | final int x2 = pb.x + (int) (w / 2.0);
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46 | final int y2 = pb.y + (int) (h / 2.0);
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47 |
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48 | final int nbw = (int) nb.getWidth();
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49 | final int nbh = (int) nb.getHeight();
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50 |
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51 | Rectangle centeredNBounds = new Rectangle(x2, y2, nbw, nbh);
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52 |
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53 | // slower check to see if label is displayed inside primitive shape
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54 | if (path.contains(centeredNBounds)) {
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55 | return centerOf(path.getMapViewState(), centeredNBounds);
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56 | }
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57 |
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58 | // if center position (C) is not inside osm shape, try naively some other positions as follows:
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59 | final int x1 = pb.x + (int) (.25 * w);
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60 | final int x3 = pb.x + (int) (.75 * w);
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61 | final int y1 = pb.y + (int) (.25 * h);
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62 | final int y3 = pb.y + (int) (.75 * h);
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63 | // +-----------+
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64 | // | 5 1 6 |
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65 | // | 4 C 2 |
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66 | // | 8 3 7 |
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67 | // +-----------+
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68 | Rectangle[] candidates = new Rectangle[] {
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69 | new Rectangle(x2, y1, nbw, nbh),
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70 | new Rectangle(x3, y2, nbw, nbh),
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71 | new Rectangle(x2, y3, nbw, nbh),
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72 | new Rectangle(x1, y2, nbw, nbh),
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73 | new Rectangle(x1, y1, nbw, nbh),
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74 | new Rectangle(x3, y1, nbw, nbh),
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75 | new Rectangle(x3, y3, nbw, nbh),
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76 | new Rectangle(x1, y3, nbw, nbh)
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77 | };
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78 | // Dumb algorithm to find a better placement. We could surely find a smarter one but it should
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79 | // solve most of building issues with only few calculations (8 at most)
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80 | for (int i = 0; i < candidates.length; i++) {
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81 | centeredNBounds = candidates[i];
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82 | if (path.contains(centeredNBounds)) {
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83 | return centerOf(path.getMapViewState(), centeredNBounds);
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84 | }
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85 | }
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86 |
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87 | // none found
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88 | return null;
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89 | }
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90 |
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91 | private static MapViewPositionAndRotation centerOf(MapViewState mapViewState, Rectangle centeredNBounds) {
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92 | return new MapViewPositionAndRotation(
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93 | mapViewState.getForView(centeredNBounds.getCenterX(), centeredNBounds.getCenterY()), 0);
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94 | }
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95 |
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96 | @Override
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97 | public boolean supportsGlyphVector() {
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98 | return false;
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99 | }
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100 | }
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