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 = null; 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 public void visit(Bounds b) { 051 if(b != null) 052 { 053 visit(b.getMin()); 054 visit(b.getMax()); 055 } 056 } 057 058 public void visit(ProjectionBounds b) { 059 if(b != null) 060 { 061 visit(b.getMin()); 062 visit(b.getMax()); 063 } 064 } 065 066 public void visit(LatLon latlon) { 067 if(latlon != null) 068 { 069 if(latlon instanceof CachedLatLon) { 070 visit(((CachedLatLon)latlon).getEastNorth()); 071 } else { 072 visit(Main.getProjection().latlon2eastNorth(latlon)); 073 } 074 } 075 } 076 077 public void visit(EastNorth eastNorth) { 078 if (eastNorth != null) { 079 if (bounds == null) { 080 bounds = new ProjectionBounds(eastNorth); 081 } else { 082 bounds.extend(eastNorth); 083 } 084 } 085 } 086 087 public boolean hasExtend() { 088 return bounds != null && bounds.hasExtend(); 089 } 090 091 /** 092 * @return The bounding box or <code>null</code> if no coordinates have passed 093 */ 094 public ProjectionBounds getBounds() { 095 return bounds; 096 } 097 098 /** 099 * Enlarges the calculated bounding box by 0.002 degrees. 100 * If the bounding box has not been set (<code>min</code> or <code>max</code> 101 * equal <code>null</code>) this method does not do anything. 102 */ 103 public void enlargeBoundingBox() { 104 enlargeBoundingBox(Main.pref.getDouble("edit.zoom-enlarge-bbox", 0.002)); 105 } 106 107 /** 108 * Enlarges the calculated bounding box by the specified number of degrees. 109 * If the bounding box has not been set (<code>min</code> or <code>max</code> 110 * equal <code>null</code>) this method does not do anything. 111 * 112 * @param enlargeDegree 113 */ 114 public void enlargeBoundingBox(double enlargeDegree) { 115 if (bounds == null) 116 return; 117 LatLon minLatlon = Main.getProjection().eastNorth2latlon(bounds.getMin()); 118 LatLon maxLatlon = Main.getProjection().eastNorth2latlon(bounds.getMax()); 119 bounds = new ProjectionBounds( 120 Main.getProjection().latlon2eastNorth(new LatLon(minLatlon.lat() - enlargeDegree, minLatlon.lon() - enlargeDegree)), 121 Main.getProjection().latlon2eastNorth(new LatLon(maxLatlon.lat() + enlargeDegree, maxLatlon.lon() + enlargeDegree))); 122 } 123 124 /** 125 * Enlarges the bounding box up to <code>maxEnlargePercent</code>, depending on 126 * its size. If the bounding box is small, it will be enlarged more in relation 127 * to its beginning size. The larger the bounding box, the smaller the change, 128 * down to the minimum of 1% enlargement. 129 * 130 * Warning: if the bounding box only contains a single node, no expansion takes 131 * place because a node has no width/height. Use <code>enlargeToMinDegrees</code> 132 * instead. 133 * 134 * Example: You specify enlargement to be up to 100%. 135 * 136 * Bounding box is a small house: enlargement will be 95?100%, i.e. 137 * making enough space so that the house fits twice on the screen in 138 * each direction. 139 * 140 * Bounding box is a large landuse, like a forest: Enlargement will 141 * be 1?10%, i.e. just add a little border around the landuse. 142 * 143 * If the bounding box has not been set (<code>min</code> or <code>max</code> 144 * equal <code>null</code>) this method does not do anything. 145 * 146 * @param maxEnlargePercent 147 */ 148 public void enlargeBoundingBoxLogarithmically(double maxEnlargePercent) { 149 if (bounds == null) 150 return; 151 152 double diffEast = bounds.getMax().east() - bounds.getMin().east(); 153 double diffNorth = bounds.getMax().north() - bounds.getMin().north(); 154 155 double enlargeEast = Math.min(maxEnlargePercent - 10*Math.log(diffEast), 1)/100; 156 double enlargeNorth = Math.min(maxEnlargePercent - 10*Math.log(diffNorth), 1)/100; 157 158 visit(bounds.getMin().add(-enlargeEast/2, -enlargeNorth/2)); 159 visit(bounds.getMax().add(+enlargeEast/2, +enlargeNorth/2)); 160 } 161 162 /** 163 * Specify a degree larger than 0 in order to make the bounding box at least 164 * the specified size in width and height. The value is ignored if the 165 * bounding box is already larger than the specified amount. 166 * 167 * If the bounding box has not been set (<code>min</code> or <code>max</code> 168 * equal <code>null</code>) this method does not do anything. 169 * 170 * If the bounding box contains objects and is to be enlarged, the objects 171 * will be centered within the new bounding box. 172 * 173 * @param size minimum width and height in meter 174 */ 175 public void enlargeToMinSize(double size) { 176 if (bounds == null) 177 return; 178 // convert size from meters to east/north units 179 double en_size = size * Main.map.mapView.getScale() / Main.map.mapView.getDist100Pixel() * 100; 180 visit(bounds.getMin().add(-en_size/2, -en_size/2)); 181 visit(bounds.getMax().add(+en_size/2, +en_size/2)); 182 } 183 184 185 @Override public String toString() { 186 return "BoundingXYVisitor["+bounds+"]"; 187 } 188 189 public void computeBoundingBox(Collection<? extends OsmPrimitive> primitives) { 190 if (primitives == null) return; 191 for (OsmPrimitive p: primitives) { 192 if (p == null) { 193 continue; 194 } 195 p.accept(this); 196 } 197 } 198}