source: josm/trunk/src/org/openstreetmap/josm/actions/SimplifyWayAction.java@ 8884

Last change on this file since 8884 was 8540, checked in by Don-vip, 9 years ago

fix remaining checkstyle issues
  • Property svn:eol-style set to native
File size: 10.7 KB
Line 
1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.actions;
3
4import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
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;
10import java.util.ArrayList;
11import java.util.Collection;
12import java.util.Collections;
13import java.util.HashSet;
14import java.util.LinkedList;
15import java.util.List;
16import java.util.Set;
17
18import javax.swing.JOptionPane;
19
20import org.openstreetmap.josm.Main;
21import org.openstreetmap.josm.command.ChangeCommand;
22import org.openstreetmap.josm.command.Command;
23import org.openstreetmap.josm.command.DeleteCommand;
24import org.openstreetmap.josm.command.SequenceCommand;
25import org.openstreetmap.josm.data.osm.DataSet;
26import org.openstreetmap.josm.data.osm.Node;
27import org.openstreetmap.josm.data.osm.OsmPrimitive;
28import org.openstreetmap.josm.data.osm.Way;
29import org.openstreetmap.josm.gui.HelpAwareOptionPane;
30import org.openstreetmap.josm.gui.HelpAwareOptionPane.ButtonSpec;
31import org.openstreetmap.josm.gui.Notification;
32import org.openstreetmap.josm.gui.help.HelpUtil;
33import org.openstreetmap.josm.tools.ImageProvider;
34import org.openstreetmap.josm.tools.Shortcut;
35
36/**
37 * Delete unnecessary nodes from a way
38 * @since 2575
39 */
40public class SimplifyWayAction extends JosmAction {
41
42 /**
43 * Constructs a new {@code SimplifyWayAction}.
44 */
45 public SimplifyWayAction() {
46 super(tr("Simplify Way"), "simplify", tr("Delete unnecessary nodes from a way."),
47 Shortcut.registerShortcut("tools:simplify", tr("Tool: {0}", tr("Simplify Way")), KeyEvent.VK_Y, Shortcut.SHIFT), true);
48 putValue("help", ht("/Action/SimplifyWay"));
49 }
50
51 protected boolean confirmWayWithNodesOutsideBoundingBox(List<? extends OsmPrimitive> primitives) {
52 return DeleteCommand.checkAndConfirmOutlyingDelete(primitives, null);
53 }
54
55 protected void alertSelectAtLeastOneWay() {
56 new Notification(
57 tr("Please select at least one way to simplify."))
58 .setIcon(JOptionPane.WARNING_MESSAGE)
59 .setDuration(Notification.TIME_SHORT)
60 .setHelpTopic(HelpUtil.ht("/Action/SimplifyWay#SelectAWayToSimplify"))
61 .show();
62 }
63
64 protected boolean confirmSimplifyManyWays(int numWays) {
65 ButtonSpec[] options = new ButtonSpec[] {
66 new ButtonSpec(
67 tr("Yes"),
68 ImageProvider.get("ok"),
69 tr("Simplify all selected ways"),
70 null
71 ),
72 new ButtonSpec(
73 tr("Cancel"),
74 ImageProvider.get("cancel"),
75 tr("Cancel operation"),
76 null
77 )
78 };
79 int ret = HelpAwareOptionPane.showOptionDialog(
80 Main.parent,
81 tr(
82 "The selection contains {0} ways. Are you sure you want to simplify them all?",
83 numWays
84 ),
85 tr("Simplify ways?"),
86 JOptionPane.WARNING_MESSAGE,
87 null, // no special icon
88 options,
89 options[0],
90 HelpUtil.ht("/Action/SimplifyWay#ConfirmSimplifyAll")
91 );
92 return ret == 0;
93 }
94
95 @Override
96 public void actionPerformed(ActionEvent e) {
97 DataSet ds = getCurrentDataSet();
98 ds.beginUpdate();
99 try {
100 List<Way> ways = OsmPrimitive.getFilteredList(ds.getSelected(), Way.class);
101 if (ways.isEmpty()) {
102 alertSelectAtLeastOneWay();
103 return;
104 } else if (!confirmWayWithNodesOutsideBoundingBox(ways)) {
105 return;
106 } else if (ways.size() > 10 && !confirmSimplifyManyWays(ways.size())) {
107 return;
108 }
109
110 Collection<Command> allCommands = new LinkedList<>();
111 for (Way way: ways) {
112 SequenceCommand simplifyCommand = simplifyWay(way);
113 if (simplifyCommand == null) {
114 continue;
115 }
116 allCommands.add(simplifyCommand);
117 }
118 if (allCommands.isEmpty()) return;
119 SequenceCommand rootCommand = new SequenceCommand(
120 trn("Simplify {0} way", "Simplify {0} ways", allCommands.size(), allCommands.size()),
121 allCommands
122 );
123 Main.main.undoRedo.add(rootCommand);
124 } finally {
125 ds.endUpdate();
126 }
127 Main.map.repaint();
128 }
129
130 /**
131 * Replies true if <code>node</code> is a required node which can't be removed
132 * in order to simplify the way.
133 *
134 * @param way the way to be simplified
135 * @param node the node to check
136 * @return true if <code>node</code> is a required node which can't be removed
137 * in order to simplify the way.
138 */
139 protected boolean isRequiredNode(Way way, Node node) {
140 boolean isRequired = Collections.frequency(way.getNodes(), node) > 1;
141 if (!isRequired) {
142 List<OsmPrimitive> parents = new LinkedList<>();
143 parents.addAll(node.getReferrers());
144 parents.remove(way);
145 isRequired = !parents.isEmpty();
146 }
147 if (!isRequired) {
148 isRequired = node.isTagged();
149 }
150 return isRequired;
151 }
152
153 /**
154 * Simplifies a way with default threshold (read from preferences).
155 *
156 * @param w the way to simplify
157 * @return The sequence of commands to run
158 * @since 6411
159 */
160 public final SequenceCommand simplifyWay(Way w) {
161 return simplifyWay(w, Main.pref.getDouble("simplify-way.max-error", 3.0));
162 }
163
164 /**
165 * Simplifies a way with a given threshold.
166 *
167 * @param w the way to simplify
168 * @param threshold the max error threshold
169 * @return The sequence of commands to run
170 * @since 6411
171 */
172 public SequenceCommand simplifyWay(Way w, double threshold) {
173 int lower = 0;
174 int i = 0;
175 List<Node> newNodes = new ArrayList<>(w.getNodesCount());
176 while (i < w.getNodesCount()) {
177 if (isRequiredNode(w, w.getNode(i))) {
178 // copy a required node to the list of new nodes. Simplify not possible
179 newNodes.add(w.getNode(i));
180 i++;
181 lower++;
182 continue;
183 }
184 i++;
185 // find the longest sequence of not required nodes ...
186 while (i < w.getNodesCount() && !isRequiredNode(w, w.getNode(i))) {
187 i++;
188 }
189 // ... and simplify them
190 buildSimplifiedNodeList(w.getNodes(), lower, Math.min(w.getNodesCount()-1, i), threshold, newNodes);
191 lower = i;
192 i++;
193 }
194
195 Set<Node> delNodes = new HashSet<>();
196 delNodes.addAll(w.getNodes());
197 delNodes.removeAll(newNodes);
198
199 if (delNodes.isEmpty()) return null;
200
201 Collection<Command> cmds = new LinkedList<>();
202 Way newWay = new Way(w);
203 newWay.setNodes(newNodes);
204 cmds.add(new ChangeCommand(w, newWay));
205 cmds.add(new DeleteCommand(delNodes));
206 w.getDataSet().clearSelection(delNodes);
207 return new SequenceCommand(
208 trn("Simplify Way (remove {0} node)", "Simplify Way (remove {0} nodes)", delNodes.size(), delNodes.size()), cmds);
209 }
210
211 /**
212 * Builds the simplified list of nodes for a way segment given by a lower index <code>from</code>
213 * and an upper index <code>to</code>
214 *
215 * @param wnew the way to simplify
216 * @param from the lower index
217 * @param to the upper index
218 * @param threshold the max error threshold
219 */
220 protected void buildSimplifiedNodeList(List<Node> wnew, int from, int to, double threshold, List<Node> simplifiedNodes) {
221
222 Node fromN = wnew.get(from);
223 Node toN = wnew.get(to);
224
225 // Get max xte
226 int imax = -1;
227 double xtemax = 0;
228 for (int i = from + 1; i < to; i++) {
229 Node n = wnew.get(i);
230 double xte = Math.abs(EARTH_RAD
231 * xtd(fromN.getCoor().lat() * Math.PI / 180, fromN.getCoor().lon() * Math.PI / 180, toN.getCoor().lat() * Math.PI
232 / 180, toN.getCoor().lon() * Math.PI / 180, n.getCoor().lat() * Math.PI / 180, n.getCoor().lon() * Math.PI
233 / 180));
234 if (xte > xtemax) {
235 xtemax = xte;
236 imax = i;
237 }
238 }
239
240 if (imax != -1 && xtemax >= threshold) {
241 // Segment cannot be simplified - try shorter segments
242 buildSimplifiedNodeList(wnew, from, imax, threshold, simplifiedNodes);
243 buildSimplifiedNodeList(wnew, imax, to, threshold, simplifiedNodes);
244 } else {
245 // Simplify segment
246 if (simplifiedNodes.isEmpty() || simplifiedNodes.get(simplifiedNodes.size()-1) != fromN) {
247 simplifiedNodes.add(fromN);
248 }
249 if (fromN != toN) {
250 simplifiedNodes.add(toN);
251 }
252 }
253 }
254
255 public static final double EARTH_RAD = 6378137.0;
256
257 /* From Aviaton Formulary v1.3
258 * http://williams.best.vwh.net/avform.htm
259 */
260 public static double dist(double lat1, double lon1, double lat2, double lon2) {
261 return 2 * Math.asin(Math.sqrt(Math.pow(Math.sin((lat1 - lat2) / 2), 2) + Math.cos(lat1) * Math.cos(lat2)
262 * Math.pow(Math.sin((lon1 - lon2) / 2), 2)));
263 }
264
265 public static double course(double lat1, double lon1, double lat2, double lon2) {
266 return Math.atan2(Math.sin(lon1 - lon2) * Math.cos(lat2), Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1)
267 * Math.cos(lat2) * Math.cos(lon1 - lon2))
268 % (2 * Math.PI);
269 }
270
271 public static double xtd(double lat1, double lon1, double lat2, double lon2, double lat3, double lon3) {
272 double distAD = dist(lat1, lon1, lat3, lon3);
273 double crsAD = course(lat1, lon1, lat3, lon3);
274 double crsAB = course(lat1, lon1, lat2, lon2);
275 return Math.asin(Math.sin(distAD) * Math.sin(crsAD - crsAB));
276 }
277
278 @Override
279 protected void updateEnabledState() {
280 if (getCurrentDataSet() == null) {
281 setEnabled(false);
282 } else {
283 updateEnabledState(getCurrentDataSet().getSelected());
284 }
285 }
286
287 @Override
288 protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
289 setEnabled(selection != null && !selection.isEmpty());
290 }
291}
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