source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/DrawAction.java@ 12316

Last change on this file since 12316 was 12316, checked in by michael2402, 7 years ago

Add a method to undo/redo to get the last command.
  • Property svn:eol-style set to native
File size: 52.3 KB
Line 
1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.actions.mapmode;
3
4import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
5import static org.openstreetmap.josm.tools.I18n.marktr;
6import static org.openstreetmap.josm.tools.I18n.tr;
7import static org.openstreetmap.josm.tools.I18n.trn;
8
9import java.awt.BasicStroke;
10import java.awt.Color;
11import java.awt.Cursor;
12import java.awt.Graphics2D;
13import java.awt.Point;
14import java.awt.event.ActionEvent;
15import java.awt.event.KeyEvent;
16import java.awt.event.MouseEvent;
17import java.util.ArrayList;
18import java.util.Collection;
19import java.util.Collections;
20import java.util.HashMap;
21import java.util.HashSet;
22import java.util.Iterator;
23import java.util.LinkedList;
24import java.util.List;
25import java.util.Map;
26import java.util.Set;
27
28import javax.swing.AbstractAction;
29import javax.swing.JCheckBoxMenuItem;
30import javax.swing.JMenuItem;
31import javax.swing.JOptionPane;
32
33import org.openstreetmap.josm.Main;
34import org.openstreetmap.josm.actions.JosmAction;
35import org.openstreetmap.josm.command.AddCommand;
36import org.openstreetmap.josm.command.ChangeCommand;
37import org.openstreetmap.josm.command.Command;
38import org.openstreetmap.josm.command.SequenceCommand;
39import org.openstreetmap.josm.data.Bounds;
40import org.openstreetmap.josm.data.SelectionChangedListener;
41import org.openstreetmap.josm.data.coor.EastNorth;
42import org.openstreetmap.josm.data.osm.DataSet;
43import org.openstreetmap.josm.data.osm.Node;
44import org.openstreetmap.josm.data.osm.OsmPrimitive;
45import org.openstreetmap.josm.data.osm.Way;
46import org.openstreetmap.josm.data.osm.WaySegment;
47import org.openstreetmap.josm.data.osm.visitor.paint.ArrowPaintHelper;
48import org.openstreetmap.josm.data.osm.visitor.paint.PaintColors;
49import org.openstreetmap.josm.data.preferences.AbstractToStringProperty;
50import org.openstreetmap.josm.data.preferences.BooleanProperty;
51import org.openstreetmap.josm.data.preferences.CachingProperty;
52import org.openstreetmap.josm.data.preferences.ColorProperty;
53import org.openstreetmap.josm.data.preferences.DoubleProperty;
54import org.openstreetmap.josm.data.preferences.StrokeProperty;
55import org.openstreetmap.josm.gui.MainMenu;
56import org.openstreetmap.josm.gui.MapView;
57import org.openstreetmap.josm.gui.MapViewState.MapViewPoint;
58import org.openstreetmap.josm.gui.NavigatableComponent;
59import org.openstreetmap.josm.gui.draw.MapPath2D;
60import org.openstreetmap.josm.gui.layer.Layer;
61import org.openstreetmap.josm.gui.layer.MapViewPaintable;
62import org.openstreetmap.josm.gui.layer.OsmDataLayer;
63import org.openstreetmap.josm.gui.util.KeyPressReleaseListener;
64import org.openstreetmap.josm.gui.util.ModifierListener;
65import org.openstreetmap.josm.tools.Geometry;
66import org.openstreetmap.josm.tools.ImageProvider;
67import org.openstreetmap.josm.tools.Pair;
68import org.openstreetmap.josm.tools.Shortcut;
69import org.openstreetmap.josm.tools.Utils;
70
71/**
72 * Mapmode to add nodes, create and extend ways.
73 */
74public class DrawAction extends MapMode implements MapViewPaintable, SelectionChangedListener, KeyPressReleaseListener, ModifierListener {
75
76 /**
77 * If this property is set, the draw action moves the viewport when adding new points.
78 * @since 12182
79 */
80 public static final CachingProperty<Boolean> VIEWPORT_FOLLOWING = new BooleanProperty("draw.viewport.following", false).cached();
81
82 private static final Color ORANGE_TRANSPARENT = new Color(Color.ORANGE.getRed(), Color.ORANGE.getGreen(), Color.ORANGE.getBlue(), 128);
83
84 private static final ArrowPaintHelper START_WAY_INDICATOR = new ArrowPaintHelper(Utils.toRadians(90), 8);
85
86 static final CachingProperty<Boolean> USE_REPEATED_SHORTCUT
87 = new BooleanProperty("draw.anglesnap.toggleOnRepeatedA", true).cached();
88 static final CachingProperty<BasicStroke> RUBBER_LINE_STROKE
89 = new StrokeProperty("draw.stroke.helper-line", "3").cached();
90
91 static final CachingProperty<BasicStroke> HIGHLIGHT_STROKE
92 = new StrokeProperty("draw.anglesnap.stroke.highlight", "10").cached();
93 static final CachingProperty<BasicStroke> HELPER_STROKE
94 = new StrokeProperty("draw.anglesnap.stroke.helper", "1 4").cached();
95
96 static final CachingProperty<Double> SNAP_ANGLE_TOLERANCE
97 = new DoubleProperty("draw.anglesnap.tolerance", 5.0).cached();
98 static final CachingProperty<Boolean> DRAW_CONSTRUCTION_GEOMETRY
99 = new BooleanProperty("draw.anglesnap.drawConstructionGeometry", true).cached();
100 static final CachingProperty<Boolean> SHOW_PROJECTED_POINT
101 = new BooleanProperty("draw.anglesnap.drawProjectedPoint", true).cached();
102 static final CachingProperty<Boolean> SNAP_TO_PROJECTIONS
103 = new BooleanProperty("draw.anglesnap.projectionsnap", true).cached();
104
105 static final CachingProperty<Boolean> SHOW_ANGLE
106 = new BooleanProperty("draw.anglesnap.showAngle", true).cached();
107
108 static final CachingProperty<Color> SNAP_HELPER_COLOR
109 = new ColorProperty(marktr("draw angle snap"), Color.ORANGE).cached();
110
111 static final CachingProperty<Color> HIGHLIGHT_COLOR
112 = new ColorProperty(marktr("draw angle snap highlight"), ORANGE_TRANSPARENT).cached();
113
114 static final AbstractToStringProperty<Color> RUBBER_LINE_COLOR
115 = PaintColors.SELECTED.getProperty().getChildColor(marktr("helper line"));
116
117 static final CachingProperty<Boolean> DRAW_HELPER_LINE
118 = new BooleanProperty("draw.helper-line", true).cached();
119 static final CachingProperty<Boolean> DRAW_TARGET_HIGHLIGHT
120 = new BooleanProperty("draw.target-highlight", true).cached();
121 static final CachingProperty<Double> SNAP_TO_INTERSECTION_THRESHOLD
122 = new DoubleProperty("edit.snap-intersection-threshold", 10).cached();
123
124 private final Cursor cursorJoinNode;
125 private final Cursor cursorJoinWay;
126
127 private transient Node lastUsedNode;
128 private double toleranceMultiplier;
129
130 private transient Node mouseOnExistingNode;
131 private transient Set<Way> mouseOnExistingWays = new HashSet<>();
132 // old highlights store which primitives are currently highlighted. This
133 // is true, even if target highlighting is disabled since the status bar
134 // derives its information from this list as well.
135 private transient Set<OsmPrimitive> oldHighlights = new HashSet<>();
136 // new highlights contains a list of primitives that should be highlighted
137 // but haven't been so far. The idea is to compare old and new and only
138 // repaint if there are changes.
139 private transient Set<OsmPrimitive> newHighlights = new HashSet<>();
140 private boolean wayIsFinished;
141 private Point mousePos;
142 private Point oldMousePos;
143
144 private transient Node currentBaseNode;
145 private transient Node previousNode;
146 private EastNorth currentMouseEastNorth;
147
148 private final transient DrawSnapHelper snapHelper = new DrawSnapHelper(this);
149
150 private final transient Shortcut backspaceShortcut;
151 private final BackSpaceAction backspaceAction;
152 private final transient Shortcut snappingShortcut;
153 private boolean ignoreNextKeyRelease;
154
155 private final SnapChangeAction snapChangeAction;
156 private final JCheckBoxMenuItem snapCheckboxMenuItem;
157 private static final BasicStroke BASIC_STROKE = new BasicStroke(1);
158
159 private Point rightClickPressPos;
160
161 /**
162 * Constructs a new {@code DrawAction}.
163 * @since 11713
164 */
165 public DrawAction() {
166 super(tr("Draw"), "node/autonode", tr("Draw nodes"),
167 Shortcut.registerShortcut("mapmode:draw", tr("Mode: {0}", tr("Draw")), KeyEvent.VK_A, Shortcut.DIRECT),
168 ImageProvider.getCursor("crosshair", null));
169
170 snappingShortcut = Shortcut.registerShortcut("mapmode:drawanglesnapping",
171 tr("Mode: Draw Angle snapping"), KeyEvent.CHAR_UNDEFINED, Shortcut.NONE);
172 snapChangeAction = new SnapChangeAction();
173 snapCheckboxMenuItem = addMenuItem();
174 snapHelper.setMenuCheckBox(snapCheckboxMenuItem);
175 backspaceShortcut = Shortcut.registerShortcut("mapmode:backspace",
176 tr("Backspace in Add mode"), KeyEvent.VK_BACK_SPACE, Shortcut.DIRECT);
177 backspaceAction = new BackSpaceAction();
178 cursorJoinNode = ImageProvider.getCursor("crosshair", "joinnode");
179 cursorJoinWay = ImageProvider.getCursor("crosshair", "joinway");
180
181 snapHelper.init();
182 }
183
184 private JCheckBoxMenuItem addMenuItem() {
185 int n = Main.main.menu.editMenu.getItemCount();
186 for (int i = n-1; i > 0; i--) {
187 JMenuItem item = Main.main.menu.editMenu.getItem(i);
188 if (item != null && item.getAction() != null && item.getAction() instanceof SnapChangeAction) {
189 Main.main.menu.editMenu.remove(i);
190 }
191 }
192 return MainMenu.addWithCheckbox(Main.main.menu.editMenu, snapChangeAction, MainMenu.WINDOW_MENU_GROUP.VOLATILE);
193 }
194
195 /**
196 * Checks if a map redraw is required and does so if needed. Also updates the status bar.
197 * @return true if a repaint is needed
198 */
199 private boolean redrawIfRequired() {
200 updateStatusLine();
201 // repaint required if the helper line is active.
202 boolean needsRepaint = DRAW_HELPER_LINE.get() && !wayIsFinished;
203 if (DRAW_TARGET_HIGHLIGHT.get()) {
204 // move newHighlights to oldHighlights; only update changed primitives
205 for (OsmPrimitive x : newHighlights) {
206 if (oldHighlights.contains(x)) {
207 continue;
208 }
209 x.setHighlighted(true);
210 needsRepaint = true;
211 }
212 oldHighlights.removeAll(newHighlights);
213 for (OsmPrimitive x : oldHighlights) {
214 x.setHighlighted(false);
215 needsRepaint = true;
216 }
217 }
218 // required in order to print correct help text
219 oldHighlights = newHighlights;
220
221 if (!needsRepaint && !DRAW_TARGET_HIGHLIGHT.get())
222 return false;
223
224 // update selection to reflect which way being modified
225 OsmDataLayer editLayer = getLayerManager().getEditLayer();
226 if (editLayer != null && getCurrentBaseNode() != null && !editLayer.data.selectionEmpty()) {
227 DataSet currentDataSet = editLayer.data;
228 Way continueFrom = getWayForNode(getCurrentBaseNode());
229 if (alt && continueFrom != null && (!getCurrentBaseNode().isSelected() || continueFrom.isSelected())) {
230 addRemoveSelection(currentDataSet, getCurrentBaseNode(), continueFrom);
231 needsRepaint = true;
232 } else if (!alt && continueFrom != null && !continueFrom.isSelected()) {
233 currentDataSet.addSelected(continueFrom);
234 needsRepaint = true;
235 }
236 }
237
238 if (needsRepaint && editLayer != null) {
239 editLayer.invalidate();
240 }
241 return needsRepaint;
242 }
243
244 private static void addRemoveSelection(DataSet ds, OsmPrimitive toAdd, OsmPrimitive toRemove) {
245 ds.beginUpdate(); // to prevent the selection listener to screw around with the state
246 try {
247 ds.addSelected(toAdd);
248 ds.clearSelection(toRemove);
249 } finally {
250 ds.endUpdate();
251 }
252 }
253
254 @Override
255 public void enterMode() {
256 if (!isEnabled())
257 return;
258 super.enterMode();
259 readPreferences();
260
261 // determine if selection is suitable to continue drawing. If it
262 // isn't, set wayIsFinished to true to avoid superfluous repaints.
263 determineCurrentBaseNodeAndPreviousNode(getLayerManager().getEditDataSet().getSelected());
264 wayIsFinished = getCurrentBaseNode() == null;
265
266 toleranceMultiplier = 0.01 * NavigatableComponent.PROP_SNAP_DISTANCE.get();
267
268 snapHelper.init();
269 snapCheckboxMenuItem.getAction().setEnabled(true);
270
271 Main.map.statusLine.getAnglePanel().addMouseListener(snapHelper.anglePopupListener);
272 Main.registerActionShortcut(backspaceAction, backspaceShortcut);
273
274 Main.map.mapView.addMouseListener(this);
275 Main.map.mapView.addMouseMotionListener(this);
276 Main.map.mapView.addTemporaryLayer(this);
277 DataSet.addSelectionListener(this);
278
279 Main.map.keyDetector.addKeyListener(this);
280 Main.map.keyDetector.addModifierListener(this);
281 ignoreNextKeyRelease = true;
282 }
283
284 @Override
285 public void exitMode() {
286 super.exitMode();
287 Main.map.mapView.removeMouseListener(this);
288 Main.map.mapView.removeMouseMotionListener(this);
289 Main.map.mapView.removeTemporaryLayer(this);
290 DataSet.removeSelectionListener(this);
291 Main.unregisterActionShortcut(backspaceAction, backspaceShortcut);
292 snapHelper.unsetFixedMode();
293 snapCheckboxMenuItem.getAction().setEnabled(false);
294
295 Main.map.statusLine.getAnglePanel().removeMouseListener(snapHelper.anglePopupListener);
296 Main.map.statusLine.activateAnglePanel(false);
297
298 removeHighlighting();
299 Main.map.keyDetector.removeKeyListener(this);
300 Main.map.keyDetector.removeModifierListener(this);
301 }
302
303 /**
304 * redraw to (possibly) get rid of helper line if selection changes.
305 */
306 @Override
307 public void modifiersChanged(int modifiers) {
308 if (!Main.isDisplayingMapView() || !Main.map.mapView.isActiveLayerDrawable())
309 return;
310 updateKeyModifiers(modifiers);
311 computeHelperLine();
312 addHighlighting();
313 }
314
315 @Override
316 public void doKeyPressed(KeyEvent e) {
317 if (!snappingShortcut.isEvent(e) && !(USE_REPEATED_SHORTCUT.get() && getShortcut().isEvent(e)))
318 return;
319 snapHelper.setFixedMode();
320 computeHelperLine();
321 redrawIfRequired();
322 }
323
324 @Override
325 public void doKeyReleased(KeyEvent e) {
326 if (!snappingShortcut.isEvent(e) && !(USE_REPEATED_SHORTCUT.get() && getShortcut().isEvent(e)))
327 return;
328 if (ignoreNextKeyRelease) {
329 ignoreNextKeyRelease = false;
330 return;
331 }
332 snapHelper.unFixOrTurnOff();
333 computeHelperLine();
334 redrawIfRequired();
335 }
336
337 /**
338 * redraw to (possibly) get rid of helper line if selection changes.
339 */
340 @Override
341 public void selectionChanged(Collection<? extends OsmPrimitive> newSelection) {
342 if (!Main.map.mapView.isActiveLayerDrawable())
343 return;
344 computeHelperLine();
345 addHighlighting();
346 }
347
348 private void tryAgain(MouseEvent e) {
349 getLayerManager().getEditDataSet().setSelected();
350 mouseReleased(e);
351 }
352
353 /**
354 * This function should be called when the user wishes to finish his current draw action.
355 * If Potlatch Style is enabled, it will switch to select tool, otherwise simply disable
356 * the helper line until the user chooses to draw something else.
357 */
358 private void finishDrawing() {
359 lastUsedNode = null;
360 wayIsFinished = true;
361 Main.map.selectSelectTool(true);
362 snapHelper.noSnapNow();
363
364 // Redraw to remove the helper line stub
365 computeHelperLine();
366 removeHighlighting();
367 }
368
369 @Override
370 public void mousePressed(MouseEvent e) {
371 if (e.getButton() == MouseEvent.BUTTON3) {
372 rightClickPressPos = e.getPoint();
373 }
374 }
375
376 /**
377 * If user clicked with the left button, add a node at the current mouse
378 * position.
379 *
380 * If in nodeway mode, insert the node into the way.
381 */
382 @Override
383 public void mouseReleased(MouseEvent e) {
384 if (e.getButton() == MouseEvent.BUTTON3) {
385 Point curMousePos = e.getPoint();
386 if (curMousePos.equals(rightClickPressPos)) {
387 tryToSetBaseSegmentForAngleSnap();
388 }
389 return;
390 }
391 if (e.getButton() != MouseEvent.BUTTON1)
392 return;
393 if (!Main.map.mapView.isActiveLayerDrawable())
394 return;
395 // request focus in order to enable the expected keyboard shortcuts
396 //
397 Main.map.mapView.requestFocus();
398
399 if (e.getClickCount() > 1 && mousePos != null && mousePos.equals(oldMousePos)) {
400 // A double click equals "user clicked last node again, finish way"
401 // Change draw tool only if mouse position is nearly the same, as
402 // otherwise fast clicks will count as a double click
403 finishDrawing();
404 return;
405 }
406 oldMousePos = mousePos;
407
408 // we copy ctrl/alt/shift from the event just in case our global
409 // keyDetector didn't make it through the security manager. Unclear
410 // if that can ever happen but better be safe.
411 updateKeyModifiers(e);
412 mousePos = e.getPoint();
413
414 DataSet ds = getLayerManager().getEditDataSet();
415 Collection<OsmPrimitive> selection = new ArrayList<>(ds.getSelected());
416
417 boolean newNode = false;
418 Node n = Main.map.mapView.getNearestNode(mousePos, OsmPrimitive::isSelectable);
419 if (ctrl) {
420 Iterator<Way> it = ds.getSelectedWays().iterator();
421 if (it.hasNext()) {
422 // ctrl-click on node of selected way = reuse node despite of ctrl
423 if (!it.next().containsNode(n)) n = null;
424 } else {
425 n = null; // ctrl-click + no selected way = new node
426 }
427 }
428
429 if (n != null && !snapHelper.isActive()) {
430 // user clicked on node
431 if (selection.isEmpty() || wayIsFinished) {
432 // select the clicked node and do nothing else
433 // (this is just a convenience option so that people don't
434 // have to switch modes)
435
436 ds.setSelected(n);
437 // If we extend/continue an existing way, select it already now to make it obvious
438 Way continueFrom = getWayForNode(n);
439 if (continueFrom != null) {
440 ds.addSelected(continueFrom);
441 }
442
443 // The user explicitly selected a node, so let him continue drawing
444 wayIsFinished = false;
445 return;
446 }
447 } else {
448 EastNorth newEN;
449 if (n != null) {
450 EastNorth foundPoint = n.getEastNorth();
451 // project found node to snapping line
452 newEN = snapHelper.getSnapPoint(foundPoint);
453 // do not add new node if there is some node within snapping distance
454 double tolerance = Main.map.mapView.getDist100Pixel() * toleranceMultiplier;
455 if (foundPoint.distance(newEN) > tolerance) {
456 n = new Node(newEN); // point != projected, so we create new node
457 newNode = true;
458 }
459 } else { // n==null, no node found in clicked area
460 EastNorth mouseEN = Main.map.mapView.getEastNorth(e.getX(), e.getY());
461 newEN = snapHelper.isSnapOn() ? snapHelper.getSnapPoint(mouseEN) : mouseEN;
462 n = new Node(newEN); //create node at clicked point
463 newNode = true;
464 }
465 snapHelper.unsetFixedMode();
466 }
467
468 Collection<Command> cmds = new LinkedList<>();
469 Collection<OsmPrimitive> newSelection = new LinkedList<>(ds.getSelected());
470 List<Way> reuseWays = new ArrayList<>();
471 List<Way> replacedWays = new ArrayList<>();
472
473 if (newNode) {
474 if (n.getCoor().isOutSideWorld()) {
475 JOptionPane.showMessageDialog(
476 Main.parent,
477 tr("Cannot add a node outside of the world."),
478 tr("Warning"),
479 JOptionPane.WARNING_MESSAGE
480 );
481 return;
482 }
483 cmds.add(new AddCommand(n));
484
485 if (!ctrl) {
486 // Insert the node into all the nearby way segments
487 List<WaySegment> wss = Main.map.mapView.getNearestWaySegments(
488 Main.map.mapView.getPoint(n), OsmPrimitive::isSelectable);
489 if (snapHelper.isActive()) {
490 tryToMoveNodeOnIntersection(wss, n);
491 }
492 insertNodeIntoAllNearbySegments(wss, n, newSelection, cmds, replacedWays, reuseWays);
493 }
494 }
495 // now "n" is newly created or reused node that shoud be added to some way
496
497 // This part decides whether or not a "segment" (i.e. a connection) is made to an existing node.
498
499 // For a connection to be made, the user must either have a node selected (connection
500 // is made to that node), or he must have a way selected *and* one of the endpoints
501 // of that way must be the last used node (connection is made to last used node), or
502 // he must have a way and a node selected (connection is made to the selected node).
503
504 // If the above does not apply, the selection is cleared and a new try is started
505
506 boolean extendedWay = false;
507 boolean wayIsFinishedTemp = wayIsFinished;
508 wayIsFinished = false;
509
510 // don't draw lines if shift is held
511 if (!selection.isEmpty() && !shift) {
512 Node selectedNode = null;
513 Way selectedWay = null;
514
515 for (OsmPrimitive p : selection) {
516 if (p instanceof Node) {
517 if (selectedNode != null) {
518 // Too many nodes selected to do something useful
519 tryAgain(e);
520 return;
521 }
522 selectedNode = (Node) p;
523 } else if (p instanceof Way) {
524 if (selectedWay != null) {
525 // Too many ways selected to do something useful
526 tryAgain(e);
527 return;
528 }
529 selectedWay = (Way) p;
530 }
531 }
532
533 // the node from which we make a connection
534 Node n0 = findNodeToContinueFrom(selectedNode, selectedWay);
535 // We have a selection but it isn't suitable. Try again.
536 if (n0 == null) {
537 tryAgain(e);
538 return;
539 }
540 if (!wayIsFinishedTemp) {
541 if (isSelfContainedWay(selectedWay, n0, n))
542 return;
543
544 // User clicked last node again, finish way
545 if (n0 == n) {
546 finishDrawing();
547 return;
548 }
549
550 // Ok we know now that we'll insert a line segment, but will it connect to an
551 // existing way or make a new way of its own? The "alt" modifier means that the
552 // user wants a new way.
553 Way way = alt ? null : (selectedWay != null ? selectedWay : getWayForNode(n0));
554 Way wayToSelect;
555
556 // Don't allow creation of self-overlapping ways
557 if (way != null) {
558 int nodeCount = 0;
559 for (Node p : way.getNodes()) {
560 if (p.equals(n0)) {
561 nodeCount++;
562 }
563 }
564 if (nodeCount > 1) {
565 way = null;
566 }
567 }
568
569 if (way == null) {
570 way = new Way();
571 way.addNode(n0);
572 cmds.add(new AddCommand(way));
573 wayToSelect = way;
574 } else {
575 int i;
576 if ((i = replacedWays.indexOf(way)) != -1) {
577 way = reuseWays.get(i);
578 wayToSelect = way;
579 } else {
580 wayToSelect = way;
581 Way wnew = new Way(way);
582 cmds.add(new ChangeCommand(way, wnew));
583 way = wnew;
584 }
585 }
586
587 // Connected to a node that's already in the way
588 if (way.containsNode(n)) {
589 wayIsFinished = true;
590 selection.clear();
591 }
592
593 // Add new node to way
594 if (way.getNode(way.getNodesCount() - 1) == n0) {
595 way.addNode(n);
596 } else {
597 way.addNode(0, n);
598 }
599
600 extendedWay = true;
601 newSelection.clear();
602 newSelection.add(wayToSelect);
603 }
604 }
605 if (!extendedWay && !newNode) {
606 return; // We didn't do anything.
607 }
608
609 String title = getTitle(newNode, n, newSelection, reuseWays, extendedWay);
610
611 Command c = new SequenceCommand(title, cmds);
612
613 Main.main.undoRedo.add(c);
614 if (!wayIsFinished) {
615 lastUsedNode = n;
616 }
617
618 ds.setSelected(newSelection);
619
620 // "viewport following" mode for tracing long features
621 // from aerial imagery or GPS tracks.
622 if (VIEWPORT_FOLLOWING.get()) {
623 Main.map.mapView.smoothScrollTo(n.getEastNorth());
624 }
625 computeHelperLine();
626 removeHighlighting();
627 }
628
629 private static String getTitle(boolean newNode, Node n, Collection<OsmPrimitive> newSelection, List<Way> reuseWays,
630 boolean extendedWay) {
631 String title;
632 if (!extendedWay) {
633 if (reuseWays.isEmpty()) {
634 title = tr("Add node");
635 } else {
636 title = tr("Add node into way");
637 for (Way w : reuseWays) {
638 newSelection.remove(w);
639 }
640 }
641 newSelection.clear();
642 newSelection.add(n);
643 } else if (!newNode) {
644 title = tr("Connect existing way to node");
645 } else if (reuseWays.isEmpty()) {
646 title = tr("Add a new node to an existing way");
647 } else {
648 title = tr("Add node into way and connect");
649 }
650 return title;
651 }
652
653 private void insertNodeIntoAllNearbySegments(List<WaySegment> wss, Node n, Collection<OsmPrimitive> newSelection,
654 Collection<Command> cmds, List<Way> replacedWays, List<Way> reuseWays) {
655 Map<Way, List<Integer>> insertPoints = new HashMap<>();
656 for (WaySegment ws : wss) {
657 List<Integer> is;
658 if (insertPoints.containsKey(ws.way)) {
659 is = insertPoints.get(ws.way);
660 } else {
661 is = new ArrayList<>();
662 insertPoints.put(ws.way, is);
663 }
664
665 is.add(ws.lowerIndex);
666 }
667
668 Set<Pair<Node, Node>> segSet = new HashSet<>();
669
670 for (Map.Entry<Way, List<Integer>> insertPoint : insertPoints.entrySet()) {
671 Way w = insertPoint.getKey();
672 List<Integer> is = insertPoint.getValue();
673
674 Way wnew = new Way(w);
675
676 pruneSuccsAndReverse(is);
677 for (int i : is) {
678 segSet.add(Pair.sort(new Pair<>(w.getNode(i), w.getNode(i+1))));
679 wnew.addNode(i + 1, n);
680 }
681
682 // If ALT is pressed, a new way should be created and that new way should get
683 // selected. This works everytime unless the ways the nodes get inserted into
684 // are already selected. This is the case when creating a self-overlapping way
685 // but pressing ALT prevents this. Therefore we must de-select the way manually
686 // here so /only/ the new way will be selected after this method finishes.
687 if (alt) {
688 newSelection.add(insertPoint.getKey());
689 }
690
691 cmds.add(new ChangeCommand(insertPoint.getKey(), wnew));
692 replacedWays.add(insertPoint.getKey());
693 reuseWays.add(wnew);
694 }
695
696 adjustNode(segSet, n);
697 }
698
699 /**
700 * Prevent creation of ways that look like this: &lt;----&gt;
701 * This happens if users want to draw a no-exit-sideway from the main way like this:
702 * ^
703 * |&lt;----&gt;
704 * |
705 * The solution isn't ideal because the main way will end in the side way, which is bad for
706 * navigation software ("drive straight on") but at least easier to fix. Maybe users will fix
707 * it on their own, too. At least it's better than producing an error.
708 *
709 * @param selectedWay the way to check
710 * @param currentNode the current node (i.e. the one the connection will be made from)
711 * @param targetNode the target node (i.e. the one the connection will be made to)
712 * @return {@code true} if this would create a selfcontaining way, {@code false} otherwise.
713 */
714 private boolean isSelfContainedWay(Way selectedWay, Node currentNode, Node targetNode) {
715 if (selectedWay != null) {
716 int posn0 = selectedWay.getNodes().indexOf(currentNode);
717 // CHECKSTYLE.OFF: SingleSpaceSeparator
718 if ((posn0 != -1 && // n0 is part of way
719 (posn0 >= 1 && targetNode.equals(selectedWay.getNode(posn0-1)))) || // previous node
720 (posn0 < selectedWay.getNodesCount()-1 && targetNode.equals(selectedWay.getNode(posn0+1)))) { // next node
721 getLayerManager().getEditDataSet().setSelected(targetNode);
722 lastUsedNode = targetNode;
723 return true;
724 }
725 // CHECKSTYLE.ON: SingleSpaceSeparator
726 }
727
728 return false;
729 }
730
731 /**
732 * Finds a node to continue drawing from. Decision is based upon given node and way.
733 * @param selectedNode Currently selected node, may be null
734 * @param selectedWay Currently selected way, may be null
735 * @return Node if a suitable node is found, null otherwise
736 */
737 private Node findNodeToContinueFrom(Node selectedNode, Way selectedWay) {
738 // No nodes or ways have been selected, this occurs when a relation
739 // has been selected or the selection is empty
740 if (selectedNode == null && selectedWay == null)
741 return null;
742
743 if (selectedNode == null) {
744 if (selectedWay.isFirstLastNode(lastUsedNode))
745 return lastUsedNode;
746
747 // We have a way selected, but no suitable node to continue from. Start anew.
748 return null;
749 }
750
751 if (selectedWay == null)
752 return selectedNode;
753
754 if (selectedWay.isFirstLastNode(selectedNode))
755 return selectedNode;
756
757 // We have a way and node selected, but it's not at the start/end of the way. Start anew.
758 return null;
759 }
760
761 @Override
762 public void mouseDragged(MouseEvent e) {
763 mouseMoved(e);
764 }
765
766 @Override
767 public void mouseMoved(MouseEvent e) {
768 if (!Main.map.mapView.isActiveLayerDrawable())
769 return;
770
771 // we copy ctrl/alt/shift from the event just in case our global
772 // keyDetector didn't make it through the security manager. Unclear
773 // if that can ever happen but better be safe.
774 updateKeyModifiers(e);
775 mousePos = e.getPoint();
776 if (snapHelper.isSnapOn() && ctrl)
777 tryToSetBaseSegmentForAngleSnap();
778
779 computeHelperLine();
780 addHighlighting();
781 }
782
783 /**
784 * This method is used to detect segment under mouse and use it as reference for angle snapping
785 */
786 private void tryToSetBaseSegmentForAngleSnap() {
787 WaySegment seg = Main.map.mapView.getNearestWaySegment(mousePos, OsmPrimitive::isSelectable);
788 if (seg != null) {
789 snapHelper.setBaseSegment(seg);
790 }
791 }
792
793 /**
794 * This method prepares data required for painting the "helper line" from
795 * the last used position to the mouse cursor. It duplicates some code from
796 * mouseReleased() (FIXME).
797 */
798 private void computeHelperLine() {
799 if (mousePos == null) {
800 // Don't draw the line.
801 currentMouseEastNorth = null;
802 currentBaseNode = null;
803 return;
804 }
805
806 Collection<OsmPrimitive> selection = getLayerManager().getEditDataSet().getSelected();
807
808 MapView mv = Main.map.mapView;
809 Node currentMouseNode = null;
810 mouseOnExistingNode = null;
811 mouseOnExistingWays = new HashSet<>();
812
813 showStatusInfo(-1, -1, -1, snapHelper.isSnapOn());
814
815 if (!ctrl && mousePos != null) {
816 currentMouseNode = mv.getNearestNode(mousePos, OsmPrimitive::isSelectable);
817 }
818
819 // We need this for highlighting and we'll only do so if we actually want to re-use
820 // *and* there is no node nearby (because nodes beat ways when re-using)
821 if (!ctrl && currentMouseNode == null) {
822 List<WaySegment> wss = mv.getNearestWaySegments(mousePos, OsmPrimitive::isSelectable);
823 for (WaySegment ws : wss) {
824 mouseOnExistingWays.add(ws.way);
825 }
826 }
827
828 if (currentMouseNode != null) {
829 // user clicked on node
830 if (selection.isEmpty()) return;
831 currentMouseEastNorth = currentMouseNode.getEastNorth();
832 mouseOnExistingNode = currentMouseNode;
833 } else {
834 // no node found in clicked area
835 currentMouseEastNorth = mv.getEastNorth(mousePos.x, mousePos.y);
836 }
837
838 determineCurrentBaseNodeAndPreviousNode(selection);
839 if (previousNode == null) {
840 snapHelper.noSnapNow();
841 }
842
843 if (getCurrentBaseNode() == null || getCurrentBaseNode() == currentMouseNode)
844 return; // Don't create zero length way segments.
845
846
847 double curHdg = Utils.toDegrees(getCurrentBaseNode().getEastNorth()
848 .heading(currentMouseEastNorth));
849 double baseHdg = -1;
850 if (previousNode != null) {
851 EastNorth en = previousNode.getEastNorth();
852 if (en != null) {
853 baseHdg = Utils.toDegrees(en.heading(getCurrentBaseNode().getEastNorth()));
854 }
855 }
856
857 snapHelper.checkAngleSnapping(currentMouseEastNorth, baseHdg, curHdg);
858
859 // status bar was filled by snapHelper
860 }
861
862 static void showStatusInfo(double angle, double hdg, double distance, boolean activeFlag) {
863 Main.map.statusLine.setAngle(angle);
864 Main.map.statusLine.activateAnglePanel(activeFlag);
865 Main.map.statusLine.setHeading(hdg);
866 Main.map.statusLine.setDist(distance);
867 }
868
869 /**
870 * Helper function that sets fields currentBaseNode and previousNode
871 * @param selection
872 * uses also lastUsedNode field
873 */
874 private void determineCurrentBaseNodeAndPreviousNode(Collection<OsmPrimitive> selection) {
875 Node selectedNode = null;
876 Way selectedWay = null;
877 for (OsmPrimitive p : selection) {
878 if (p instanceof Node) {
879 if (selectedNode != null)
880 return;
881 selectedNode = (Node) p;
882 } else if (p instanceof Way) {
883 if (selectedWay != null)
884 return;
885 selectedWay = (Way) p;
886 }
887 }
888 // we are here, if not more than 1 way or node is selected,
889
890 // the node from which we make a connection
891 currentBaseNode = null;
892 previousNode = null;
893
894 // Try to find an open way to measure angle from it. The way is not to be continued!
895 // warning: may result in changes of currentBaseNode and previousNode
896 // please remove if bugs arise
897 if (selectedWay == null && selectedNode != null) {
898 for (OsmPrimitive p: selectedNode.getReferrers()) {
899 if (p.isUsable() && p instanceof Way && ((Way) p).isFirstLastNode(selectedNode)) {
900 if (selectedWay != null) { // two uncontinued ways, nothing to take as reference
901 selectedWay = null;
902 break;
903 } else {
904 // set us ~continue this way (measure angle from it)
905 selectedWay = (Way) p;
906 }
907 }
908 }
909 }
910
911 if (selectedNode == null) {
912 if (selectedWay == null)
913 return;
914 continueWayFromNode(selectedWay, lastUsedNode);
915 } else if (selectedWay == null) {
916 currentBaseNode = selectedNode;
917 } else if (!selectedWay.isDeleted()) { // fix #7118
918 continueWayFromNode(selectedWay, selectedNode);
919 }
920 }
921
922 /**
923 * if one of the ends of {@code way} is given {@code node},
924 * then set currentBaseNode = node and previousNode = adjacent node of way
925 * @param way way to continue
926 * @param node starting node
927 */
928 private void continueWayFromNode(Way way, Node node) {
929 int n = way.getNodesCount();
930 if (node == way.firstNode()) {
931 currentBaseNode = node;
932 if (n > 1) previousNode = way.getNode(1);
933 } else if (node == way.lastNode()) {
934 currentBaseNode = node;
935 if (n > 1) previousNode = way.getNode(n-2);
936 }
937 }
938
939 /**
940 * Repaint on mouse exit so that the helper line goes away.
941 */
942 @Override
943 public void mouseExited(MouseEvent e) {
944 OsmDataLayer editLayer = Main.getLayerManager().getEditLayer();
945 if (editLayer == null)
946 return;
947 mousePos = e.getPoint();
948 snapHelper.noSnapNow();
949 boolean repaintIssued = removeHighlighting();
950 // force repaint in case snapHelper needs one. If removeHighlighting
951 // caused one already, don't do it again.
952 if (!repaintIssued) {
953 editLayer.invalidate();
954 }
955 }
956
957 /**
958 * @param n node
959 * @return If the node is the end of exactly one way, return this.
960 * <code>null</code> otherwise.
961 */
962 public static Way getWayForNode(Node n) {
963 Way way = null;
964 for (Way w : Utils.filteredCollection(n.getReferrers(), Way.class)) {
965 if (!w.isUsable() || w.getNodesCount() < 1) {
966 continue;
967 }
968 Node firstNode = w.getNode(0);
969 Node lastNode = w.getNode(w.getNodesCount() - 1);
970 if ((firstNode == n || lastNode == n) && (firstNode != lastNode)) {
971 if (way != null)
972 return null;
973 way = w;
974 }
975 }
976 return way;
977 }
978
979 /**
980 * Replies the current base node, after having checked it is still usable (see #11105).
981 * @return the current base node (can be null). If not-null, it's guaranteed the node is usable
982 */
983 public Node getCurrentBaseNode() {
984 if (currentBaseNode != null && (currentBaseNode.getDataSet() == null || !currentBaseNode.isUsable())) {
985 currentBaseNode = null;
986 }
987 return currentBaseNode;
988 }
989
990 private static void pruneSuccsAndReverse(List<Integer> is) {
991 Set<Integer> is2 = new HashSet<>();
992 for (int i : is) {
993 if (!is2.contains(i - 1) && !is2.contains(i + 1)) {
994 is2.add(i);
995 }
996 }
997 is.clear();
998 is.addAll(is2);
999 Collections.sort(is);
1000 Collections.reverse(is);
1001 }
1002
1003 /**
1004 * Adjusts the position of a node to lie on a segment (or a segment intersection).
1005 *
1006 * If one or more than two segments are passed, the node is adjusted
1007 * to lie on the first segment that is passed.
1008 *
1009 * If two segments are passed, the node is adjusted to be at their intersection.
1010 *
1011 * No action is taken if no segments are passed.
1012 *
1013 * @param segs the segments to use as a reference when adjusting
1014 * @param n the node to adjust
1015 */
1016 private static void adjustNode(Collection<Pair<Node, Node>> segs, Node n) {
1017 switch (segs.size()) {
1018 case 0:
1019 return;
1020 case 2:
1021 adjustNodeTwoSegments(segs, n);
1022 break;
1023 default:
1024 adjustNodeDefault(segs, n);
1025 }
1026 }
1027
1028 private static void adjustNodeTwoSegments(Collection<Pair<Node, Node>> segs, Node n) {
1029 // This computes the intersection between the two segments and adjusts the node position.
1030 Iterator<Pair<Node, Node>> i = segs.iterator();
1031 Pair<Node, Node> seg = i.next();
1032 EastNorth pA = seg.a.getEastNorth();
1033 EastNorth pB = seg.b.getEastNorth();
1034 seg = i.next();
1035 EastNorth pC = seg.a.getEastNorth();
1036 EastNorth pD = seg.b.getEastNorth();
1037
1038 double u = det(pB.east() - pA.east(), pB.north() - pA.north(), pC.east() - pD.east(), pC.north() - pD.north());
1039
1040 // Check for parallel segments and do nothing if they are
1041 // In practice this will probably only happen when a way has been duplicated
1042
1043 if (u == 0)
1044 return;
1045
1046 // q is a number between 0 and 1
1047 // It is the point in the segment where the intersection occurs
1048 // if the segment is scaled to length 1
1049
1050 double q = det(pB.north() - pC.north(), pB.east() - pC.east(), pD.north() - pC.north(), pD.east() - pC.east()) / u;
1051 EastNorth intersection = new EastNorth(
1052 pB.east() + q * (pA.east() - pB.east()),
1053 pB.north() + q * (pA.north() - pB.north()));
1054
1055
1056 // only adjust to intersection if within snapToIntersectionThreshold pixel of mouse click; otherwise
1057 // fall through to default action.
1058 // (for semi-parallel lines, intersection might be miles away!)
1059 if (Main.map.mapView.getPoint2D(n).distance(Main.map.mapView.getPoint2D(intersection)) < SNAP_TO_INTERSECTION_THRESHOLD.get()) {
1060 n.setEastNorth(intersection);
1061 return;
1062 }
1063
1064 adjustNodeDefault(segs, n);
1065 }
1066
1067 private static void adjustNodeDefault(Collection<Pair<Node, Node>> segs, Node n) {
1068 EastNorth p = n.getEastNorth();
1069 Pair<Node, Node> seg = segs.iterator().next();
1070 EastNorth pA = seg.a.getEastNorth();
1071 EastNorth pB = seg.b.getEastNorth();
1072 double a = p.distanceSq(pB);
1073 double b = p.distanceSq(pA);
1074 double c = pA.distanceSq(pB);
1075 double q = (a - b + c) / (2*c);
1076 n.setEastNorth(new EastNorth(pB.east() + q * (pA.east() - pB.east()), pB.north() + q * (pA.north() - pB.north())));
1077 }
1078
1079 // helper for adjustNode
1080 static double det(double a, double b, double c, double d) {
1081 return a * d - b * c;
1082 }
1083
1084 private void tryToMoveNodeOnIntersection(List<WaySegment> wss, Node n) {
1085 if (wss.isEmpty())
1086 return;
1087 WaySegment ws = wss.get(0);
1088 EastNorth p1 = ws.getFirstNode().getEastNorth();
1089 EastNorth p2 = ws.getSecondNode().getEastNorth();
1090 if (snapHelper.dir2 != null && getCurrentBaseNode() != null) {
1091 EastNorth xPoint = Geometry.getSegmentSegmentIntersection(p1, p2, snapHelper.dir2,
1092 getCurrentBaseNode().getEastNorth());
1093 if (xPoint != null) {
1094 n.setEastNorth(xPoint);
1095 }
1096 }
1097 }
1098
1099 /**
1100 * Takes the data from computeHelperLine to determine which ways/nodes should be highlighted
1101 * (if feature enabled). Also sets the target cursor if appropriate. It adds the to-be-
1102 * highlighted primitives to newHighlights but does not actually highlight them. This work is
1103 * done in redrawIfRequired. This means, calling addHighlighting() without redrawIfRequired()
1104 * will leave the data in an inconsistent state.
1105 *
1106 * The status bar derives its information from oldHighlights, so in order to update the status
1107 * bar both addHighlighting() and repaintIfRequired() are needed, since former fills newHighlights
1108 * and latter processes them into oldHighlights.
1109 */
1110 private void addHighlighting() {
1111 newHighlights = new HashSet<>();
1112
1113 // if ctrl key is held ("no join"), don't highlight anything
1114 if (ctrl) {
1115 Main.map.mapView.setNewCursor(cursor, this);
1116 redrawIfRequired();
1117 return;
1118 }
1119
1120 // This happens when nothing is selected, but we still want to highlight the "target node"
1121 if (mouseOnExistingNode == null && mousePos != null && getLayerManager().getEditDataSet().selectionEmpty()) {
1122 mouseOnExistingNode = Main.map.mapView.getNearestNode(mousePos, OsmPrimitive::isSelectable);
1123 }
1124
1125 if (mouseOnExistingNode != null) {
1126 Main.map.mapView.setNewCursor(cursorJoinNode, this);
1127 newHighlights.add(mouseOnExistingNode);
1128 redrawIfRequired();
1129 return;
1130 }
1131
1132 // Insert the node into all the nearby way segments
1133 if (mouseOnExistingWays.isEmpty()) {
1134 Main.map.mapView.setNewCursor(cursor, this);
1135 redrawIfRequired();
1136 return;
1137 }
1138
1139 Main.map.mapView.setNewCursor(cursorJoinWay, this);
1140 newHighlights.addAll(mouseOnExistingWays);
1141 redrawIfRequired();
1142 }
1143
1144 /**
1145 * Removes target highlighting from primitives. Issues repaint if required.
1146 * @return true if a repaint has been issued.
1147 */
1148 private boolean removeHighlighting() {
1149 newHighlights = new HashSet<>();
1150 return redrawIfRequired();
1151 }
1152
1153 @Override
1154 public void paint(Graphics2D g, MapView mv, Bounds box) {
1155 // sanity checks
1156 if (Main.map.mapView == null || mousePos == null
1157 // don't draw line if we don't know where from or where to
1158 || currentMouseEastNorth == null || getCurrentBaseNode() == null
1159 // don't draw line if mouse is outside window
1160 || !Main.map.mapView.getState().getForView(mousePos.getX(), mousePos.getY()).isInView())
1161 return;
1162
1163 Graphics2D g2 = g;
1164 snapHelper.drawIfNeeded(g2, mv.getState());
1165 if (!DRAW_HELPER_LINE.get() || wayIsFinished || shift)
1166 return;
1167
1168 if (!snapHelper.isActive()) {
1169 g2.setColor(RUBBER_LINE_COLOR.get());
1170 g2.setStroke(RUBBER_LINE_STROKE.get());
1171 paintConstructionGeometry(mv, g2);
1172 } else if (DRAW_CONSTRUCTION_GEOMETRY.get()) {
1173 // else use color and stoke from snapHelper.draw
1174 paintConstructionGeometry(mv, g2);
1175 }
1176 }
1177
1178 private void paintConstructionGeometry(MapView mv, Graphics2D g2) {
1179 MapPath2D b = new MapPath2D();
1180 MapViewPoint p1 = mv.getState().getPointFor(getCurrentBaseNode());
1181 MapViewPoint p2 = mv.getState().getPointFor(currentMouseEastNorth);
1182
1183 b.moveTo(p1);
1184 b.lineTo(p2);
1185
1186 // if alt key is held ("start new way"), draw a little perpendicular line
1187 if (alt) {
1188 START_WAY_INDICATOR.paintArrowAt(b, p1, p2);
1189 }
1190
1191 g2.draw(b);
1192 g2.setStroke(BASIC_STROKE);
1193 }
1194
1195 @Override
1196 public String getModeHelpText() {
1197 StringBuilder rv;
1198 /*
1199 * No modifiers: all (Connect, Node Re-Use, Auto-Weld)
1200 * CTRL: disables node re-use, auto-weld
1201 * Shift: do not make connection
1202 * ALT: make connection but start new way in doing so
1203 */
1204
1205 /*
1206 * Status line text generation is split into two parts to keep it maintainable.
1207 * First part looks at what will happen to the new node inserted on click and
1208 * the second part will look if a connection is made or not.
1209 *
1210 * Note that this help text is not absolutely accurate as it doesn't catch any special
1211 * cases (e.g. when preventing <---> ways). The only special that it catches is when
1212 * a way is about to be finished.
1213 *
1214 * First check what happens to the new node.
1215 */
1216
1217 // oldHighlights stores the current highlights. If this
1218 // list is empty we can assume that we won't do any joins
1219 if (ctrl || oldHighlights.isEmpty()) {
1220 rv = new StringBuilder(tr("Create new node."));
1221 } else {
1222 // oldHighlights may store a node or way, check if it's a node
1223 OsmPrimitive x = oldHighlights.iterator().next();
1224 if (x instanceof Node) {
1225 rv = new StringBuilder(tr("Select node under cursor."));
1226 } else {
1227 rv = new StringBuilder(trn("Insert new node into way.", "Insert new node into {0} ways.",
1228 oldHighlights.size(), oldHighlights.size()));
1229 }
1230 }
1231
1232 /*
1233 * Check whether a connection will be made
1234 */
1235 if (!wayIsFinished && getCurrentBaseNode() != null) {
1236 if (alt) {
1237 rv.append(' ').append(tr("Start new way from last node."));
1238 } else {
1239 rv.append(' ').append(tr("Continue way from last node."));
1240 }
1241 if (snapHelper.isSnapOn()) {
1242 rv.append(' ').append(tr("Angle snapping active."));
1243 }
1244 }
1245
1246 Node n = mouseOnExistingNode;
1247 DataSet ds = getLayerManager().getEditDataSet();
1248 /*
1249 * Handle special case: Highlighted node == selected node => finish drawing
1250 */
1251 if (n != null && ds != null && ds.getSelectedNodes().contains(n)) {
1252 if (wayIsFinished) {
1253 rv = new StringBuilder(tr("Select node under cursor."));
1254 } else {
1255 rv = new StringBuilder(tr("Finish drawing."));
1256 }
1257 }
1258
1259 /*
1260 * Handle special case: Self-Overlapping or closing way
1261 */
1262 if (ds != null && !ds.getSelectedWays().isEmpty() && !wayIsFinished && !alt) {
1263 Way w = ds.getSelectedWays().iterator().next();
1264 for (Node m : w.getNodes()) {
1265 if (m.equals(mouseOnExistingNode) || mouseOnExistingWays.contains(w)) {
1266 rv.append(' ').append(tr("Finish drawing."));
1267 break;
1268 }
1269 }
1270 }
1271 return rv.toString();
1272 }
1273
1274 /**
1275 * Get selected primitives, while draw action is in progress.
1276 *
1277 * While drawing a way, technically the last node is selected.
1278 * This is inconvenient when the user tries to add/edit tags to the way.
1279 * For this case, this method returns the current way as selection,
1280 * to work around this issue.
1281 * Otherwise the normal selection of the current data layer is returned.
1282 * @return selected primitives, while draw action is in progress
1283 */
1284 public Collection<OsmPrimitive> getInProgressSelection() {
1285 DataSet ds = getLayerManager().getEditDataSet();
1286 if (ds == null) return null;
1287 if (getCurrentBaseNode() != null && !ds.selectionEmpty()) {
1288 Way continueFrom = getWayForNode(getCurrentBaseNode());
1289 if (continueFrom != null)
1290 return Collections.<OsmPrimitive>singleton(continueFrom);
1291 }
1292 return ds.getSelected();
1293 }
1294
1295 @Override
1296 public Collection<? extends OsmPrimitive> getPreservedPrimitives() {
1297 DataSet ds = getLayerManager().getEditDataSet();
1298 return ds != null ? ds.getSelected() : Collections.emptySet();
1299 }
1300
1301 @Override
1302 public boolean layerIsSupported(Layer l) {
1303 return l instanceof OsmDataLayer;
1304 }
1305
1306 @Override
1307 protected void updateEnabledState() {
1308 setEnabled(getLayerManager().getEditLayer() != null);
1309 }
1310
1311 @Override
1312 public void destroy() {
1313 super.destroy();
1314 snapChangeAction.destroy();
1315 }
1316
1317 /**
1318 * Undo the last command. Binded by default to backspace key.
1319 */
1320 public class BackSpaceAction extends AbstractAction {
1321
1322 @Override
1323 public void actionPerformed(ActionEvent e) {
1324 Main.main.undoRedo.undo();
1325 Command lastCmd = Main.main.undoRedo.getLastCommand();
1326 if (lastCmd == null) return;
1327 Node n = null;
1328 for (OsmPrimitive p: lastCmd.getParticipatingPrimitives()) {
1329 if (p instanceof Node) {
1330 if (n == null) {
1331 n = (Node) p; // found one node
1332 wayIsFinished = false;
1333 } else {
1334 // if more than 1 node were affected by previous command,
1335 // we have no way to continue, so we forget about found node
1336 n = null;
1337 break;
1338 }
1339 }
1340 }
1341 // select last added node - maybe we will continue drawing from it
1342 if (n != null) {
1343 getLayerManager().getEditDataSet().addSelected(n);
1344 }
1345 }
1346 }
1347
1348 private class SnapChangeAction extends JosmAction {
1349 /**
1350 * Constructs a new {@code SnapChangeAction}.
1351 */
1352 SnapChangeAction() {
1353 super(tr("Angle snapping"), /* ICON() */ "anglesnap",
1354 tr("Switch angle snapping mode while drawing"), null, false);
1355 putValue("help", ht("/Action/Draw/AngleSnap"));
1356 }
1357
1358 @Override
1359 public void actionPerformed(ActionEvent e) {
1360 if (snapHelper != null) {
1361 snapHelper.toggleSnapping();
1362 }
1363 }
1364
1365 @Override
1366 protected void updateEnabledState() {
1367 setEnabled(Main.map != null && Main.map.mapMode instanceof DrawAction);
1368 }
1369 }
1370}
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