1 | package iodb;
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2 |
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3 | import java.util.HashMap;
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4 | import java.util.List;
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5 | import org.openstreetmap.josm.Main;
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6 | import org.openstreetmap.josm.data.coor.EastNorth;
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7 | import org.openstreetmap.josm.data.coor.LatLon;
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8 | import org.openstreetmap.josm.data.projection.Projection;
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9 | import org.openstreetmap.josm.gui.MapView;
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10 | import org.openstreetmap.josm.gui.layer.ImageryLayer;
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11 |
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12 | /**
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13 | * Some common static methods for querying imagery layers.
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14 | *
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15 | * @author zverik
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16 | */
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17 | public class ImageryOffsetTools {
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18 | private static HashMap<String, String> imageryAliases;
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19 |
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20 | public static ImageryLayer getTopImageryLayer() {
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21 | List<ImageryLayer> layers = Main.map.mapView.getLayersOfType(ImageryLayer.class);
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22 | for( ImageryLayer layer : layers ) {
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23 | if( layer.isVisible() ) {
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24 | return layer;
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25 | }
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26 | }
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27 | return null;
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28 | }
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29 |
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30 | private static LatLon getMapCenter() {
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31 | Projection proj = Main.getProjection();
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32 | return Main.map == null || Main.map.mapView == null
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33 | ? new LatLon(0, 0) : proj.eastNorth2latlon(Main.map.mapView.getCenter());
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34 | }
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35 |
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36 | public static LatLon getLayerOffset( ImageryLayer layer, LatLon center ) {
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37 | Projection proj = Main.getProjection();
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38 | EastNorth offsetCenter = proj.latlon2eastNorth(center);
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39 | EastNorth centerOffset = offsetCenter.add(layer.getDx(), layer.getDy()); // todo: add or substract?
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40 | LatLon offsetLL = proj.eastNorth2latlon(centerOffset);
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41 | return offsetLL;
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42 | }
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43 |
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44 | public static void applyLayerOffset( ImageryLayer layer, ImageryOffset offset ) {
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45 | Projection proj = Main.getProjection();
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46 | EastNorth center = proj.latlon2eastNorth(offset.getPosition());
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47 | EastNorth offsetPos = proj.latlon2eastNorth(offset.getImageryPos());
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48 | layer.setOffset(offsetPos.getX() - center.getX(), offsetPos.getY() - center.getY()); // todo: + or -?
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49 | }
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50 |
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51 | public static String getImageryID( ImageryLayer layer ) {
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52 | if( layer == null )
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53 | return null;
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54 |
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55 | String url = layer.getInfo().getUrl();
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56 | if( url == null )
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57 | return null;
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58 |
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59 | if( imageryAliases == null )
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60 | loadImageryAliases();
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61 | for( String substr : imageryAliases.keySet() )
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62 | if( url.contains(substr) )
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63 | return imageryAliases.get(substr);
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64 |
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65 | return url; // todo: strip parametric parts, etc
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66 | }
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67 |
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68 | private static void loadImageryAliases() {
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69 | if( imageryAliases == null )
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70 | imageryAliases = new HashMap<String, String>();
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71 | else
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72 | imageryAliases.clear();
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73 |
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74 | // { substring, alias }
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75 | imageryAliases.put("bing", "bing");
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76 | // todo: load from a resource?
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77 | }
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78 |
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79 | // Following three methods were snatched from TMSLayer
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80 | private static double latToTileY(double lat, int zoom) {
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81 | double l = lat / 180 * Math.PI;
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82 | double pf = Math.log(Math.tan(l) + (1 / Math.cos(l)));
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83 | return Math.pow(2.0, zoom - 1) * (Math.PI - pf) / Math.PI;
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84 | }
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85 |
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86 | private static double lonToTileX(double lon, int zoom) {
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87 | return Math.pow(2.0, zoom - 3) * (lon + 180.0) / 45.0;
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88 | }
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89 |
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90 | public static int getCurrentZoom() {
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91 | if (Main.map == null || Main.map.mapView == null) {
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92 | return 1;
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93 | }
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94 | MapView mv = Main.map.mapView;
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95 | LatLon topLeft = mv.getLatLon(0, 0);
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96 | LatLon botRight = mv.getLatLon(mv.getWidth(), mv.getHeight());
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97 | double x1 = lonToTileX(topLeft.lon(), 1);
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98 | double y1 = latToTileY(topLeft.lat(), 1);
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99 | double x2 = lonToTileX(botRight.lon(), 1);
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100 | double y2 = latToTileY(botRight.lat(), 1);
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101 |
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102 | int screenPixels = mv.getWidth() * mv.getHeight();
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103 | double tilePixels = Math.abs((y2 - y1) * (x2 - x1) * 256 * 256);
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104 | if (screenPixels == 0 || tilePixels == 0) {
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105 | return 1;
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106 | }
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107 | double factor = screenPixels / tilePixels;
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108 | double result = Math.log(factor) / Math.log(2) / 2 + 1;
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109 | int intResult = (int) Math.floor(result);
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110 | return intResult;
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111 | }
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112 | }
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