001// License: GPL. For details, see LICENSE file. 002package org.openstreetmap.josm.actions; 003 004import static org.openstreetmap.josm.gui.help.HelpUtil.ht; 005import static org.openstreetmap.josm.tools.I18n.tr; 006import static org.openstreetmap.josm.tools.I18n.trn; 007 008import java.awt.event.ActionEvent; 009import java.awt.event.KeyEvent; 010import java.util.ArrayList; 011import java.util.Collection; 012import java.util.Collections; 013import java.util.HashSet; 014import java.util.LinkedList; 015import java.util.List; 016import java.util.Set; 017 018import javax.swing.JOptionPane; 019 020import org.openstreetmap.josm.Main; 021import org.openstreetmap.josm.command.ChangeCommand; 022import org.openstreetmap.josm.command.Command; 023import org.openstreetmap.josm.command.DeleteCommand; 024import org.openstreetmap.josm.command.SequenceCommand; 025import org.openstreetmap.josm.data.osm.DataSet; 026import org.openstreetmap.josm.data.osm.Node; 027import org.openstreetmap.josm.data.osm.OsmPrimitive; 028import org.openstreetmap.josm.data.osm.Way; 029import org.openstreetmap.josm.data.projection.Ellipsoid; 030import org.openstreetmap.josm.gui.HelpAwareOptionPane; 031import org.openstreetmap.josm.gui.HelpAwareOptionPane.ButtonSpec; 032import org.openstreetmap.josm.gui.Notification; 033import org.openstreetmap.josm.tools.ImageProvider; 034import org.openstreetmap.josm.tools.Shortcut; 035 036/** 037 * Delete unnecessary nodes from a way 038 * @since 2575 039 */ 040public class SimplifyWayAction extends JosmAction { 041 042 /** 043 * Constructs a new {@code SimplifyWayAction}. 044 */ 045 public SimplifyWayAction() { 046 super(tr("Simplify Way"), "simplify", tr("Delete unnecessary nodes from a way."), 047 Shortcut.registerShortcut("tools:simplify", tr("Tool: {0}", tr("Simplify Way")), KeyEvent.VK_Y, Shortcut.SHIFT), true); 048 putValue("help", ht("/Action/SimplifyWay")); 049 } 050 051 protected boolean confirmWayWithNodesOutsideBoundingBox(List<? extends OsmPrimitive> primitives) { 052 return DeleteCommand.checkAndConfirmOutlyingDelete(primitives, null); 053 } 054 055 protected void alertSelectAtLeastOneWay() { 056 new Notification( 057 tr("Please select at least one way to simplify.")) 058 .setIcon(JOptionPane.WARNING_MESSAGE) 059 .setDuration(Notification.TIME_SHORT) 060 .setHelpTopic(ht("/Action/SimplifyWay#SelectAWayToSimplify")) 061 .show(); 062 } 063 064 protected boolean confirmSimplifyManyWays(int numWays) { 065 ButtonSpec[] options = new ButtonSpec[] { 066 new ButtonSpec( 067 tr("Yes"), 068 ImageProvider.get("ok"), 069 tr("Simplify all selected ways"), 070 null 071 ), 072 new ButtonSpec( 073 tr("Cancel"), 074 ImageProvider.get("cancel"), 075 tr("Cancel operation"), 076 null 077 ) 078 }; 079 return 0 == HelpAwareOptionPane.showOptionDialog( 080 Main.parent, 081 tr( 082 "The selection contains {0} ways. Are you sure you want to simplify them all?", 083 numWays 084 ), 085 tr("Simplify ways?"), 086 JOptionPane.WARNING_MESSAGE, 087 null, // no special icon 088 options, 089 options[0], 090 ht("/Action/SimplifyWay#ConfirmSimplifyAll") 091 ); 092 } 093 094 @Override 095 public void actionPerformed(ActionEvent e) { 096 DataSet ds = getLayerManager().getEditDataSet(); 097 ds.beginUpdate(); 098 try { 099 List<Way> ways = OsmPrimitive.getFilteredList(ds.getSelected(), Way.class); 100 if (ways.isEmpty()) { 101 alertSelectAtLeastOneWay(); 102 return; 103 } else if (!confirmWayWithNodesOutsideBoundingBox(ways)) { 104 return; 105 } else if (ways.size() > 10 && !confirmSimplifyManyWays(ways.size())) { 106 return; 107 } 108 109 Collection<Command> allCommands = new LinkedList<>(); 110 for (Way way: ways) { 111 SequenceCommand simplifyCommand = simplifyWay(way); 112 if (simplifyCommand == null) { 113 continue; 114 } 115 allCommands.add(simplifyCommand); 116 } 117 if (allCommands.isEmpty()) return; 118 SequenceCommand rootCommand = new SequenceCommand( 119 trn("Simplify {0} way", "Simplify {0} ways", allCommands.size(), allCommands.size()), 120 allCommands 121 ); 122 Main.main.undoRedo.add(rootCommand); 123 } finally { 124 ds.endUpdate(); 125 } 126 } 127 128 /** 129 * Replies true if <code>node</code> is a required node which can't be removed 130 * in order to simplify the way. 131 * 132 * @param way the way to be simplified 133 * @param node the node to check 134 * @return true if <code>node</code> is a required node which can't be removed 135 * in order to simplify the way. 136 */ 137 protected boolean isRequiredNode(Way way, Node node) { 138 boolean isRequired = Collections.frequency(way.getNodes(), node) > 1; 139 if (!isRequired) { 140 List<OsmPrimitive> parents = new LinkedList<>(); 141 parents.addAll(node.getReferrers()); 142 parents.remove(way); 143 isRequired = !parents.isEmpty(); 144 } 145 if (!isRequired) { 146 isRequired = node.isTagged(); 147 } 148 return isRequired; 149 } 150 151 /** 152 * Simplifies a way with default threshold (read from preferences). 153 * 154 * @param w the way to simplify 155 * @return The sequence of commands to run 156 * @since 6411 157 */ 158 public final SequenceCommand simplifyWay(Way w) { 159 return simplifyWay(w, Main.pref.getDouble("simplify-way.max-error", 3.0)); 160 } 161 162 /** 163 * Simplifies a way with a given threshold. 164 * 165 * @param w the way to simplify 166 * @param threshold the max error threshold 167 * @return The sequence of commands to run 168 * @since 6411 169 */ 170 public SequenceCommand simplifyWay(Way w, double threshold) { 171 int lower = 0; 172 int i = 0; 173 List<Node> newNodes = new ArrayList<>(w.getNodesCount()); 174 while (i < w.getNodesCount()) { 175 if (isRequiredNode(w, w.getNode(i))) { 176 // copy a required node to the list of new nodes. Simplify not possible 177 newNodes.add(w.getNode(i)); 178 i++; 179 lower++; 180 continue; 181 } 182 i++; 183 // find the longest sequence of not required nodes ... 184 while (i < w.getNodesCount() && !isRequiredNode(w, w.getNode(i))) { 185 i++; 186 } 187 // ... and simplify them 188 buildSimplifiedNodeList(w.getNodes(), lower, Math.min(w.getNodesCount()-1, i), threshold, newNodes); 189 lower = i; 190 i++; 191 } 192 193 Set<Node> delNodes = new HashSet<>(); 194 delNodes.addAll(w.getNodes()); 195 delNodes.removeAll(newNodes); 196 197 if (delNodes.isEmpty()) return null; 198 199 Collection<Command> cmds = new LinkedList<>(); 200 Way newWay = new Way(w); 201 newWay.setNodes(newNodes); 202 cmds.add(new ChangeCommand(w, newWay)); 203 cmds.add(new DeleteCommand(delNodes)); 204 w.getDataSet().clearSelection(delNodes); 205 return new SequenceCommand( 206 trn("Simplify Way (remove {0} node)", "Simplify Way (remove {0} nodes)", delNodes.size(), delNodes.size()), cmds); 207 } 208 209 /** 210 * Builds the simplified list of nodes for a way segment given by a lower index <code>from</code> 211 * and an upper index <code>to</code> 212 * 213 * @param wnew the way to simplify 214 * @param from the lower index 215 * @param to the upper index 216 * @param threshold the max error threshold 217 * @param simplifiedNodes list that will contain resulting nodes 218 */ 219 protected void buildSimplifiedNodeList(List<Node> wnew, int from, int to, double threshold, List<Node> simplifiedNodes) { 220 221 Node fromN = wnew.get(from); 222 Node toN = wnew.get(to); 223 224 // Get max xte 225 int imax = -1; 226 double xtemax = 0; 227 for (int i = from + 1; i < to; i++) { 228 Node n = wnew.get(i); 229 double xte = Math.abs(Ellipsoid.WGS84.a 230 * xtd(fromN.getCoor().lat() * Math.PI / 180, fromN.getCoor().lon() * Math.PI / 180, toN.getCoor().lat() * Math.PI 231 / 180, toN.getCoor().lon() * Math.PI / 180, n.getCoor().lat() * Math.PI / 180, n.getCoor().lon() * Math.PI 232 / 180)); 233 if (xte > xtemax) { 234 xtemax = xte; 235 imax = i; 236 } 237 } 238 239 if (imax != -1 && xtemax >= threshold) { 240 // Segment cannot be simplified - try shorter segments 241 buildSimplifiedNodeList(wnew, from, imax, threshold, simplifiedNodes); 242 buildSimplifiedNodeList(wnew, imax, to, threshold, simplifiedNodes); 243 } else { 244 // Simplify segment 245 if (simplifiedNodes.isEmpty() || simplifiedNodes.get(simplifiedNodes.size()-1) != fromN) { 246 simplifiedNodes.add(fromN); 247 } 248 if (fromN != toN) { 249 simplifiedNodes.add(toN); 250 } 251 } 252 } 253 254 /* From Aviaton Formulary v1.3 255 * http://williams.best.vwh.net/avform.htm 256 */ 257 public static double dist(double lat1, double lon1, double lat2, double lon2) { 258 return 2 * Math.asin(Math.sqrt(Math.pow(Math.sin((lat1 - lat2) / 2), 2) + Math.cos(lat1) * Math.cos(lat2) 259 * Math.pow(Math.sin((lon1 - lon2) / 2), 2))); 260 } 261 262 public static double course(double lat1, double lon1, double lat2, double lon2) { 263 return Math.atan2(Math.sin(lon1 - lon2) * Math.cos(lat2), Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1) 264 * Math.cos(lat2) * Math.cos(lon1 - lon2)) 265 % (2 * Math.PI); 266 } 267 268 public static double xtd(double lat1, double lon1, double lat2, double lon2, double lat3, double lon3) { 269 double distAD = dist(lat1, lon1, lat3, lon3); 270 double crsAD = course(lat1, lon1, lat3, lon3); 271 double crsAB = course(lat1, lon1, lat2, lon2); 272 return Math.asin(Math.sin(distAD) * Math.sin(crsAD - crsAB)); 273 } 274 275 @Override 276 protected void updateEnabledState() { 277 updateEnabledStateOnCurrentSelection(); 278 } 279 280 @Override 281 protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) { 282 setEnabled(selection != null && !selection.isEmpty()); 283 } 284}