source: josm/trunk/src/org/openstreetmap/josm/actions/SimplifyWayAction.java@ 8308

Last change on this file since 8308 was 7509, checked in by stoecker, 10 years ago

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[6380]1// License: GPL. For details, see LICENSE file.
[2575]2package org.openstreetmap.josm.actions;
3
[2976]4import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
[2575]5import static org.openstreetmap.josm.tools.I18n.tr;
6import static org.openstreetmap.josm.tools.I18n.trn;
7
8import java.awt.event.ActionEvent;
9import java.awt.event.KeyEvent;
[2999]10import java.util.ArrayList;
[2575]11import java.util.Collection;
12import java.util.Collections;
13import java.util.HashSet;
14import java.util.LinkedList;
15import java.util.List;
16
17import javax.swing.JOptionPane;
18
19import org.openstreetmap.josm.Main;
20import org.openstreetmap.josm.command.ChangeCommand;
21import org.openstreetmap.josm.command.Command;
22import org.openstreetmap.josm.command.DeleteCommand;
23import org.openstreetmap.josm.command.SequenceCommand;
[3952]24import org.openstreetmap.josm.data.osm.DataSet;
[2575]25import org.openstreetmap.josm.data.osm.Node;
26import org.openstreetmap.josm.data.osm.OsmPrimitive;
27import org.openstreetmap.josm.data.osm.Way;
[2976]28import org.openstreetmap.josm.gui.HelpAwareOptionPane;
29import org.openstreetmap.josm.gui.HelpAwareOptionPane.ButtonSpec;
[6131]30import org.openstreetmap.josm.gui.Notification;
[2976]31import org.openstreetmap.josm.gui.help.HelpUtil;
32import org.openstreetmap.josm.tools.ImageProvider;
[2575]33import org.openstreetmap.josm.tools.Shortcut;
34
[6248]35/**
36 * Delete unnecessary nodes from a way
[6411]37 * @since 2575
[6248]38 */
[2575]39public class SimplifyWayAction extends JosmAction {
[7509]40
[6248]41 /**
42 * Constructs a new {@code SimplifyWayAction}.
43 */
[2575]44 public SimplifyWayAction() {
45 super(tr("Simplify Way"), "simplify", tr("Delete unnecessary nodes from a way."), Shortcut.registerShortcut("tools:simplify", tr("Tool: {0}", tr("Simplify Way")),
[4982]46 KeyEvent.VK_Y, Shortcut.SHIFT), true);
[2976]47 putValue("help", ht("/Action/SimplifyWay"));
[2575]48 }
49
[4461]50 protected boolean confirmWayWithNodesOutsideBoundingBox(List<? extends OsmPrimitive> primitives) {
[6639]51 return DeleteCommand.checkAndConfirmOutlyingDelete(primitives, null);
[2976]52 }
53
54 protected void alertSelectAtLeastOneWay() {
[6131]55 new Notification(
56 tr("Please select at least one way to simplify."))
57 .setIcon(JOptionPane.WARNING_MESSAGE)
58 .setDuration(Notification.TIME_SHORT)
59 .setHelpTopic(HelpUtil.ht("/Action/SimplifyWay#SelectAWayToSimplify"))
60 .show();
[2976]61 }
62
63 protected boolean confirmSimplifyManyWays(int numWays) {
64 ButtonSpec[] options = new ButtonSpec[] {
65 new ButtonSpec(
66 tr("Yes"),
67 ImageProvider.get("ok"),
68 tr("Simplify all selected ways"),
69 null
[4869]70 ),
71 new ButtonSpec(
72 tr("Cancel"),
73 ImageProvider.get("cancel"),
74 tr("Cancel operation"),
75 null
76 )
[2976]77 };
78 int ret = HelpAwareOptionPane.showOptionDialog(
79 Main.parent,
80 tr(
81 "The selection contains {0} ways. Are you sure you want to simplify them all?",
82 numWays
[4869]83 ),
84 tr("Simplify ways?"),
85 JOptionPane.WARNING_MESSAGE,
86 null, // no special icon
87 options,
88 options[0],
89 HelpUtil.ht("/Action/SimplifyWay#ConfirmSimplifyAll")
90 );
[2976]91 return ret == 0;
92 }
93
[6084]94 @Override
[2976]95 public void actionPerformed(ActionEvent e) {
[3952]96 DataSet ds = getCurrentDataSet();
97 ds.beginUpdate();
[6981]98 try {
[4461]99 List<Way> ways = OsmPrimitive.getFilteredList(ds.getSelected(), Way.class);
[3952]100 if (ways.isEmpty()) {
101 alertSelectAtLeastOneWay();
[2575]102 return;
[6981]103 } else if (!confirmWayWithNodesOutsideBoundingBox(ways)) {
[4461]104 return;
[6981]105 } else if (ways.size() > 10 && !confirmSimplifyManyWays(ways.size())) {
106 return;
[3952]107 }
[2575]108
[7005]109 Collection<Command> allCommands = new LinkedList<>();
[3952]110 for (Way way: ways) {
[6411]111 SequenceCommand simplifyCommand = simplifyWay(way);
[3952]112 if (simplifyCommand == null) {
113 continue;
114 }
115 allCommands.add(simplifyCommand);
[2575]116 }
[3952]117 if (allCommands.isEmpty()) return;
118 SequenceCommand rootCommand = new SequenceCommand(
119 trn("Simplify {0} way", "Simplify {0} ways", allCommands.size(), allCommands.size()),
120 allCommands
[4869]121 );
[3952]122 Main.main.undoRedo.add(rootCommand);
123 } finally {
124 ds.endUpdate();
[2575]125 }
[2976]126 Main.map.repaint();
[2575]127 }
128
[2976]129 /**
130 * Replies true if <code>node</code> is a required node which can't be removed
131 * in order to simplify the way.
[3530]132 *
[2976]133 * @param way the way to be simplified
134 * @param node the node to check
135 * @return true if <code>node</code> is a required node which can't be removed
136 * in order to simplify the way.
137 */
138 protected boolean isRequiredNode(Way way, Node node) {
139 boolean isRequired = Collections.frequency(way.getNodes(), node) > 1;
140 if (! isRequired) {
[7005]141 List<OsmPrimitive> parents = new LinkedList<>();
[2976]142 parents.addAll(node.getReferrers());
143 parents.remove(way);
144 isRequired = !parents.isEmpty();
145 }
146 if (!isRequired) {
147 isRequired = node.isTagged();
148 }
149 return isRequired;
150 }
151
152 /**
[6411]153 * Simplifies a way with default threshold (read from preferences).
[3530]154 *
[2976]155 * @param w the way to simplify
[6411]156 * @return The sequence of commands to run
157 * @since 6411
[2976]158 */
[6411]159 public final SequenceCommand simplifyWay(Way w) {
160 return simplifyWay(w, Main.pref.getDouble("simplify-way.max-error", 3.0));
161 }
162
163 /**
164 * Simplifies a way with a given threshold.
165 *
166 * @param w the way to simplify
167 * @return The sequence of commands to run
168 * @since 6411
169 */
170 public SequenceCommand simplifyWay(Way w, double threshold) {
[2976]171 int lower = 0;
172 int i = 0;
[7005]173 List<Node> newNodes = new ArrayList<>(w.getNodesCount());
[2976]174 while(i < w.getNodesCount()){
175 if (isRequiredNode(w,w.getNode(i))) {
[6411]176 // copy a required node to the list of new nodes. Simplify not possible
[2976]177 newNodes.add(w.getNode(i));
178 i++;
179 lower++;
180 continue;
[2575]181 }
[2976]182 i++;
183 // find the longest sequence of not required nodes ...
184 while(i<w.getNodesCount() && !isRequiredNode(w,w.getNode(i))) {
185 i++;
[2575]186 }
[2976]187 // ... and simplify them
[2999]188 buildSimplifiedNodeList(w.getNodes(), lower, Math.min(w.getNodesCount()-1, i), threshold,newNodes);
[2976]189 lower=i;
190 i++;
[2575]191 }
192
[7005]193 HashSet<Node> delNodes = new HashSet<>();
[2575]194 delNodes.addAll(w.getNodes());
[2976]195 delNodes.removeAll(newNodes);
[2575]196
[2976]197 if (delNodes.isEmpty()) return null;
[2575]198
[7005]199 Collection<Command> cmds = new LinkedList<>();
[2976]200 Way newWay = new Way(w);
201 newWay.setNodes(newNodes);
202 cmds.add(new ChangeCommand(w, newWay));
203 cmds.add(new DeleteCommand(delNodes));
[6411]204 w.getDataSet().clearSelection(delNodes);
[2976]205 return new SequenceCommand(trn("Simplify Way (remove {0} node)", "Simplify Way (remove {0} nodes)", delNodes.size(), delNodes.size()), cmds);
[2575]206 }
207
[2976]208 /**
209 * Builds the simplified list of nodes for a way segment given by a lower index <code>from</code>
210 * and an upper index <code>to</code>
[3530]211 *
[2976]212 * @param wnew the way to simplify
213 * @param from the lower index
214 * @param to the upper index
215 * @param threshold
[2575]216 */
[2999]217 protected void buildSimplifiedNodeList(List<Node> wnew, int from, int to, double threshold, List<Node> simplifiedNodes) {
[2575]218
[2999]219 Node fromN = wnew.get(from);
220 Node toN = wnew.get(to);
[2976]221
[2999]222 // Get max xte
[2575]223 int imax = -1;
224 double xtemax = 0;
225 for (int i = from + 1; i < to; i++) {
[2999]226 Node n = wnew.get(i);
[2575]227 double xte = Math.abs(EARTH_RAD
228 * xtd(fromN.getCoor().lat() * Math.PI / 180, fromN.getCoor().lon() * Math.PI / 180, toN.getCoor().lat() * Math.PI
229 / 180, toN.getCoor().lon() * Math.PI / 180, n.getCoor().lat() * Math.PI / 180, n.getCoor().lon() * Math.PI
230 / 180));
231 if (xte > xtemax) {
232 xtemax = xte;
233 imax = i;
234 }
235 }
236
[2976]237 if (imax != -1 && xtemax >= threshold) {
[2999]238 // Segment cannot be simplified - try shorter segments
[2976]239 buildSimplifiedNodeList(wnew, from, imax,threshold,simplifiedNodes);
240 buildSimplifiedNodeList(wnew, imax, to, threshold,simplifiedNodes);
241 } else {
[2999]242 // Simplify segment
[2976]243 if (simplifiedNodes.isEmpty() || simplifiedNodes.get(simplifiedNodes.size()-1) != fromN) {
244 simplifiedNodes.add(fromN);
245 }
[2999]246 if (fromN != toN) {
[2976]247 simplifiedNodes.add(toN);
248 }
[2575]249 }
250 }
251
[4869]252 public static final double EARTH_RAD = 6378137.0;
[2575]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) {
[6981]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));
[2575]273 }
274
275 @Override
276 protected void updateEnabledState() {
277 if (getCurrentDataSet() == null) {
278 setEnabled(false);
279 } else {
280 updateEnabledState(getCurrentDataSet().getSelected());
281 }
282 }
283
284 @Override
285 protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
286 setEnabled(selection != null && !selection.isEmpty());
287 }
288}
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