001// License: GPL. For details, see LICENSE file. 002package org.openstreetmap.josm.data.osm.visitor; 003 004import java.util.Collection; 005 006import org.openstreetmap.josm.Main; 007import org.openstreetmap.josm.data.Bounds; 008import org.openstreetmap.josm.data.ProjectionBounds; 009import org.openstreetmap.josm.data.coor.CachedLatLon; 010import org.openstreetmap.josm.data.coor.EastNorth; 011import org.openstreetmap.josm.data.coor.LatLon; 012import org.openstreetmap.josm.data.osm.Node; 013import org.openstreetmap.josm.data.osm.OsmPrimitive; 014import org.openstreetmap.josm.data.osm.Relation; 015import org.openstreetmap.josm.data.osm.RelationMember; 016import org.openstreetmap.josm.data.osm.Way; 017 018/** 019 * Calculates the total bounding rectangle of a series of {@link OsmPrimitive} objects, using the 020 * EastNorth values as reference. 021 * @author imi 022 */ 023public class BoundingXYVisitor extends AbstractVisitor { 024 025 private ProjectionBounds bounds; 026 027 @Override 028 public void visit(Node n) { 029 visit(n.getEastNorth()); 030 } 031 032 @Override 033 public void visit(Way w) { 034 if (w.isIncomplete()) return; 035 for (Node n : w.getNodes()) { 036 visit(n); 037 } 038 } 039 040 @Override 041 public void visit(Relation e) { 042 // only use direct members 043 for (RelationMember m : e.getMembers()) { 044 if (!m.isRelation()) { 045 m.getMember().accept(this); 046 } 047 } 048 } 049 050 /** 051 * Visiting call for bounds. 052 * @param b bounds 053 */ 054 public void visit(Bounds b) { 055 if (b != null) { 056 b.visitEdge(Main.getProjection(), this::visit); 057 } 058 } 059 060 /** 061 * Visiting call for projection bounds. 062 * @param b projection bounds 063 */ 064 public void visit(ProjectionBounds b) { 065 if (b != null) { 066 visit(b.getMin()); 067 visit(b.getMax()); 068 } 069 } 070 071 /** 072 * Visiting call for lat/lon. 073 * @param latlon lat/lon 074 */ 075 public void visit(LatLon latlon) { 076 if (latlon != null) { 077 if (latlon instanceof CachedLatLon) { 078 visit(((CachedLatLon) latlon).getEastNorth()); 079 } else { 080 visit(Main.getProjection().latlon2eastNorth(latlon)); 081 } 082 } 083 } 084 085 /** 086 * Visiting call for east/north. 087 * @param eastNorth east/north 088 */ 089 public void visit(EastNorth eastNorth) { 090 if (eastNorth != null) { 091 if (bounds == null) { 092 bounds = new ProjectionBounds(eastNorth); 093 } else { 094 bounds.extend(eastNorth); 095 } 096 } 097 } 098 099 /** 100 * Determines if the visitor has a non null bounds area. 101 * @return {@code true} if the visitor has a non null bounds area 102 * @see ProjectionBounds#hasExtend 103 */ 104 public boolean hasExtend() { 105 return bounds != null && bounds.hasExtend(); 106 } 107 108 /** 109 * @return The bounding box or <code>null</code> if no coordinates have passed 110 */ 111 public ProjectionBounds getBounds() { 112 return bounds; 113 } 114 115 /** 116 * Enlarges the calculated bounding box by 0.002 degrees. 117 * If the bounding box has not been set (<code>min</code> or <code>max</code> 118 * equal <code>null</code>) this method does not do anything. 119 */ 120 public void enlargeBoundingBox() { 121 enlargeBoundingBox(Main.pref.getDouble("edit.zoom-enlarge-bbox", 0.002)); 122 } 123 124 /** 125 * Enlarges the calculated bounding box by the specified number of degrees. 126 * If the bounding box has not been set (<code>min</code> or <code>max</code> 127 * equal <code>null</code>) this method does not do anything. 128 * 129 * @param enlargeDegree number of degrees to enlarge on each side 130 */ 131 public void enlargeBoundingBox(double enlargeDegree) { 132 if (bounds == null) 133 return; 134 LatLon minLatlon = Main.getProjection().eastNorth2latlon(bounds.getMin()); 135 LatLon maxLatlon = Main.getProjection().eastNorth2latlon(bounds.getMax()); 136 bounds = new ProjectionBounds( 137 Main.getProjection().latlon2eastNorth(new LatLon( 138 Math.max(-90, minLatlon.lat() - enlargeDegree), 139 Math.max(-180, minLatlon.lon() - enlargeDegree))), 140 Main.getProjection().latlon2eastNorth(new LatLon( 141 Math.min(90, maxLatlon.lat() + enlargeDegree), 142 Math.min(180, maxLatlon.lon() + enlargeDegree)))); 143 } 144 145 /** 146 * Enlarges the bounding box up to <code>maxEnlargePercent</code>, depending on 147 * its size. If the bounding box is small, it will be enlarged more in relation 148 * to its beginning size. The larger the bounding box, the smaller the change, 149 * down to the minimum of 1% enlargement. 150 * 151 * Warning: if the bounding box only contains a single node, no expansion takes 152 * place because a node has no width/height. Use <code>enlargeToMinDegrees</code> 153 * instead. 154 * 155 * Example: You specify enlargement to be up to 100%. 156 * 157 * Bounding box is a small house: enlargement will be 95–100%, i.e. 158 * making enough space so that the house fits twice on the screen in 159 * each direction. 160 * 161 * Bounding box is a large landuse, like a forest: Enlargement will 162 * be 1–10%, i.e. just add a little border around the landuse. 163 * 164 * If the bounding box has not been set (<code>min</code> or <code>max</code> 165 * equal <code>null</code>) this method does not do anything. 166 * 167 * @param maxEnlargePercent maximum enlargement in percentage (100.0 for 100%) 168 */ 169 public void enlargeBoundingBoxLogarithmically(double maxEnlargePercent) { 170 if (bounds == null) 171 return; 172 173 double diffEast = bounds.getMax().east() - bounds.getMin().east(); 174 double diffNorth = bounds.getMax().north() - bounds.getMin().north(); 175 176 double enlargeEast = Math.min(maxEnlargePercent - 10*Math.log(diffEast), 1)/100; 177 double enlargeNorth = Math.min(maxEnlargePercent - 10*Math.log(diffNorth), 1)/100; 178 179 visit(bounds.getMin().add(-enlargeEast/2, -enlargeNorth/2)); 180 visit(bounds.getMax().add(+enlargeEast/2, +enlargeNorth/2)); 181 } 182 183 /** 184 * Specify a degree larger than 0 in order to make the bounding box at least 185 * the specified size in width and height. The value is ignored if the 186 * bounding box is already larger than the specified amount. 187 * 188 * If the bounding box has not been set (<code>min</code> or <code>max</code> 189 * equal <code>null</code>) this method does not do anything. 190 * 191 * If the bounding box contains objects and is to be enlarged, the objects 192 * will be centered within the new bounding box. 193 * 194 * @param size minimum width and height in meter 195 */ 196 public void enlargeToMinSize(double size) { 197 if (bounds == null) 198 return; 199 // convert size from meters to east/north units 200 double enSize = size * Main.map.mapView.getScale() / Main.map.mapView.getDist100Pixel() * 100; 201 visit(bounds.getMin().add(-enSize/2, -enSize/2)); 202 visit(bounds.getMax().add(+enSize/2, +enSize/2)); 203 } 204 205 @Override 206 public String toString() { 207 return "BoundingXYVisitor["+bounds+']'; 208 } 209 210 /** 211 * Compute the bounding box of a collection of primitives. 212 * @param primitives the collection of primitives 213 */ 214 public void computeBoundingBox(Collection<? extends OsmPrimitive> primitives) { 215 if (primitives == null) return; 216 for (OsmPrimitive p: primitives) { 217 if (p == null) { 218 continue; 219 } 220 p.accept(this); 221 } 222 } 223}