source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/DrawAction.java@ 4086

Last change on this file since 4086 was 4086, checked in by bastiK, 13 years ago

new follow line action (author: Germán Márquez Mejía) fixes #4190
  • Property svn:eol-style set to native
File size: 35.5 KB
Line 
1// License: GPL. See LICENSE file for details.
2package org.openstreetmap.josm.actions.mapmode;
3
4import static org.openstreetmap.josm.tools.I18n.tr;
5import static org.openstreetmap.josm.tools.I18n.trn;
6
7import java.awt.AWTEvent;
8import java.awt.BasicStroke;
9import java.awt.Color;
10import java.awt.Cursor;
11import java.awt.EventQueue;
12import java.awt.Graphics2D;
13import java.awt.Point;
14import java.awt.Toolkit;
15import java.awt.event.AWTEventListener;
16import java.awt.event.ActionEvent;
17import java.awt.event.InputEvent;
18import java.awt.event.KeyEvent;
19import java.awt.event.MouseEvent;
20import java.awt.geom.GeneralPath;
21import java.util.ArrayList;
22import java.util.Collection;
23import java.util.Collections;
24import java.util.HashMap;
25import java.util.HashSet;
26import java.util.Iterator;
27import java.util.LinkedList;
28import java.util.List;
29import java.util.Map;
30import java.util.Set;
31
32import javax.swing.JOptionPane;
33
34import org.openstreetmap.josm.Main;
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.coor.LatLon;
43import org.openstreetmap.josm.data.osm.DataSet;
44import org.openstreetmap.josm.data.osm.Node;
45import org.openstreetmap.josm.data.osm.OsmPrimitive;
46import org.openstreetmap.josm.data.osm.Way;
47import org.openstreetmap.josm.data.osm.WaySegment;
48import org.openstreetmap.josm.data.osm.visitor.paint.PaintColors;
49import org.openstreetmap.josm.gui.MapFrame;
50import org.openstreetmap.josm.gui.MapView;
51import org.openstreetmap.josm.gui.layer.Layer;
52import org.openstreetmap.josm.gui.layer.MapViewPaintable;
53import org.openstreetmap.josm.gui.layer.OsmDataLayer;
54import org.openstreetmap.josm.tools.ImageProvider;
55import org.openstreetmap.josm.tools.Pair;
56import org.openstreetmap.josm.tools.Shortcut;
57
58/**
59 *
60 */
61public class DrawAction extends MapMode implements MapViewPaintable, SelectionChangedListener, AWTEventListener {
62 //static private final Logger logger = Logger.getLogger(DrawAction.class.getName());
63
64 final private Cursor cursorJoinNode;
65 final private Cursor cursorJoinWay;
66
67 private Node lastUsedNode = null;
68 private double PHI=Math.toRadians(90);
69
70 private boolean ctrl;
71 private boolean alt;
72 private boolean shift;
73 private Node mouseOnExistingNode;
74 private Set<Way> mouseOnExistingWays = new HashSet<Way>();
75 private Set<OsmPrimitive> oldHighlights = new HashSet<OsmPrimitive>();
76 private boolean drawHelperLine;
77 private boolean wayIsFinished = false;
78 private boolean drawTargetHighlight;
79 private Point mousePos;
80 private Point oldMousePos;
81 private Color selectedColor;
82
83 private Node currentBaseNode;
84 private EastNorth currentMouseEastNorth;
85
86 private Shortcut extraShortcut;
87
88 public DrawAction(MapFrame mapFrame) {
89 super(tr("Draw"), "node/autonode", tr("Draw nodes"),
90 Shortcut.registerShortcut("mapmode:draw", tr("Mode: {0}", tr("Draw")), KeyEvent.VK_A, Shortcut.GROUP_EDIT),
91 mapFrame, ImageProvider.getCursor("crosshair", null));
92
93 // Add extra shortcut N
94 extraShortcut = Shortcut.registerShortcut("mapmode:drawfocus", tr("Mode: Draw Focus"), KeyEvent.VK_N, Shortcut.GROUP_EDIT);
95 Main.registerActionShortcut(this, extraShortcut);
96
97 cursorJoinNode = ImageProvider.getCursor("crosshair", "joinnode");
98 cursorJoinWay = ImageProvider.getCursor("crosshair", "joinway");
99 }
100
101 /**
102 * Checks if a map redraw is required and does so if needed. Also updates the status bar
103 */
104 private void redrawIfRequired() {
105 updateStatusLine();
106 if ((!drawHelperLine || wayIsFinished) && !drawTargetHighlight) return;
107 Main.map.mapView.repaint();
108 }
109
110 /**
111 * Takes the data from computeHelperLine to determine which ways/nodes should be highlighted
112 * (if feature enabled). Also sets the target cursor if appropriate.
113 */
114 private void addHighlighting() {
115 removeHighlighting();
116 // if ctrl key is held ("no join"), don't highlight anything
117 if (ctrl) {
118 Main.map.mapView.setNewCursor(cursor, this);
119 return;
120 }
121
122 // This happens when nothing is selected, but we still want to highlight the "target node"
123 if (mouseOnExistingNode == null && getCurrentDataSet().getSelected().size() == 0
124 && mousePos != null) {
125 mouseOnExistingNode = Main.map.mapView.getNearestNode(mousePos, OsmPrimitive.isSelectablePredicate);
126 }
127
128 if (mouseOnExistingNode != null) {
129 Main.map.mapView.setNewCursor(cursorJoinNode, this);
130 // We also need this list for the statusbar help text
131 oldHighlights.add(mouseOnExistingNode);
132 if(drawTargetHighlight) {
133 mouseOnExistingNode.setHighlighted(true);
134 }
135 return;
136 }
137
138 // Insert the node into all the nearby way segments
139 if (mouseOnExistingWays.size() == 0) {
140 Main.map.mapView.setNewCursor(cursor, this);
141 return;
142 }
143
144 Main.map.mapView.setNewCursor(cursorJoinWay, this);
145
146 // We also need this list for the statusbar help text
147 oldHighlights.addAll(mouseOnExistingWays);
148 if (!drawTargetHighlight) return;
149 for (Way w : mouseOnExistingWays) {
150 w.setHighlighted(true);
151 }
152 }
153
154 /**
155 * Removes target highlighting from primitives
156 */
157 private void removeHighlighting() {
158 for(OsmPrimitive prim : oldHighlights) {
159 prim.setHighlighted(false);
160 }
161 oldHighlights = new HashSet<OsmPrimitive>();
162 }
163
164 @Override public void enterMode() {
165 if (!isEnabled())
166 return;
167 super.enterMode();
168 selectedColor =PaintColors.SELECTED.get();
169 drawHelperLine = Main.pref.getBoolean("draw.helper-line", true);
170 drawTargetHighlight = Main.pref.getBoolean("draw.target-highlight", true);
171 wayIsFinished = false;
172
173 Main.map.mapView.addMouseListener(this);
174 Main.map.mapView.addMouseMotionListener(this);
175 Main.map.mapView.addTemporaryLayer(this);
176 DataSet.addSelectionListener(this);
177
178 try {
179 Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.KEY_EVENT_MASK);
180 } catch (SecurityException ex) {
181 }
182 // would like to but haven't got mouse position yet:
183 // computeHelperLine(false, false, false);
184 }
185
186 @Override public void exitMode() {
187 super.exitMode();
188 Main.map.mapView.removeMouseListener(this);
189 Main.map.mapView.removeMouseMotionListener(this);
190 Main.map.mapView.removeTemporaryLayer(this);
191 DataSet.removeSelectionListener(this);
192 removeHighlighting();
193 try {
194 Toolkit.getDefaultToolkit().removeAWTEventListener(this);
195 } catch (SecurityException ex) {
196 }
197
198 // when exiting we let everybody know about the currently selected
199 // primitives
200 //
201 DataSet ds = getCurrentDataSet();
202 if(ds != null) {
203 ds.fireSelectionChanged();
204 }
205 }
206
207 /**
208 * redraw to (possibly) get rid of helper line if selection changes.
209 */
210 public void eventDispatched(AWTEvent event) {
211 if(Main.map == null || Main.map.mapView == null || !Main.map.mapView.isActiveLayerDrawable())
212 return;
213 updateKeyModifiers((InputEvent) event);
214 computeHelperLine();
215 addHighlighting();
216 redrawIfRequired();
217 }
218 /**
219 * redraw to (possibly) get rid of helper line if selection changes.
220 */
221 public void selectionChanged(Collection<? extends OsmPrimitive> newSelection) {
222 if(!Main.map.mapView.isActiveLayerDrawable())
223 return;
224 computeHelperLine();
225 addHighlighting();
226 redrawIfRequired();
227 }
228
229 private void tryAgain(MouseEvent e) {
230 getCurrentDataSet().setSelected();
231 mouseReleased(e);
232 }
233
234 /**
235 * This function should be called when the user wishes to finish his current draw action.
236 * If Potlatch Style is enabled, it will switch to select tool, otherwise simply disable
237 * the helper line until the user chooses to draw something else.
238 */
239 private void finishDrawing() {
240 // let everybody else know about the current selection
241 //
242 Main.main.getCurrentDataSet().fireSelectionChanged();
243 lastUsedNode = null;
244 wayIsFinished = true;
245 Main.map.selectSelectTool(true);
246
247 // Redraw to remove the helper line stub
248 computeHelperLine();
249 removeHighlighting();
250 redrawIfRequired();
251 }
252
253 /**
254 * If user clicked with the left button, add a node at the current mouse
255 * position.
256 *
257 * If in nodeway mode, insert the node into the way.
258 */
259 @Override public void mouseReleased(MouseEvent e) {
260 if (e.getButton() != MouseEvent.BUTTON1)
261 return;
262 if(!Main.map.mapView.isActiveLayerDrawable())
263 return;
264 // request focus in order to enable the expected keyboard shortcuts
265 //
266 Main.map.mapView.requestFocus();
267
268 if(e.getClickCount() > 1 && mousePos != null && mousePos.equals(oldMousePos)) {
269 // A double click equals "user clicked last node again, finish way"
270 // Change draw tool only if mouse position is nearly the same, as
271 // otherwise fast clicks will count as a double click
272 finishDrawing();
273 return;
274 }
275 oldMousePos = mousePos;
276
277 // we copy ctrl/alt/shift from the event just in case our global
278 // AWTEvent didn't make it through the security manager. Unclear
279 // if that can ever happen but better be safe.
280 updateKeyModifiers(e);
281 mousePos = e.getPoint();
282
283 DataSet ds = getCurrentDataSet();
284 Collection<OsmPrimitive> selection = new ArrayList<OsmPrimitive>(ds.getSelected());
285 Collection<Command> cmds = new LinkedList<Command>();
286 Collection<OsmPrimitive> newSelection = new LinkedList<OsmPrimitive>(ds.getSelected());
287
288 ArrayList<Way> reuseWays = new ArrayList<Way>(),
289 replacedWays = new ArrayList<Way>();
290 boolean newNode = false;
291 Node n = null;
292
293 if (!ctrl) {
294 n = Main.map.mapView.getNearestNode(mousePos, OsmPrimitive.isSelectablePredicate);
295 }
296
297 if (n != null) {
298 // user clicked on node
299 if (selection.isEmpty() || wayIsFinished) {
300 // select the clicked node and do nothing else
301 // (this is just a convenience option so that people don't
302 // have to switch modes)
303 newSelection.clear();
304 newSelection.add(n);
305 getCurrentDataSet().setSelected(n);
306 // The user explicitly selected a node, so let him continue drawing
307 wayIsFinished = false;
308 return;
309 }
310 } else {
311 // no node found in clicked area
312 n = new Node(Main.map.mapView.getLatLon(e.getX(), e.getY()));
313 if (n.getCoor().isOutSideWorld()) {
314 JOptionPane.showMessageDialog(
315 Main.parent,
316 tr("Cannot add a node outside of the world."),
317 tr("Warning"),
318 JOptionPane.WARNING_MESSAGE
319 );
320 return;
321 }
322 newNode = true;
323
324 cmds.add(new AddCommand(n));
325
326 if (!ctrl) {
327 // Insert the node into all the nearby way segments
328 List<WaySegment> wss = Main.map.mapView.getNearestWaySegments(e.getPoint(), OsmPrimitive.isSelectablePredicate);
329 Map<Way, List<Integer>> insertPoints = new HashMap<Way, List<Integer>>();
330 for (WaySegment ws : wss) {
331 List<Integer> is;
332 if (insertPoints.containsKey(ws.way)) {
333 is = insertPoints.get(ws.way);
334 } else {
335 is = new ArrayList<Integer>();
336 insertPoints.put(ws.way, is);
337 }
338
339 is.add(ws.lowerIndex);
340 }
341
342 Set<Pair<Node,Node>> segSet = new HashSet<Pair<Node,Node>>();
343
344 for (Map.Entry<Way, List<Integer>> insertPoint : insertPoints.entrySet()) {
345 Way w = insertPoint.getKey();
346 List<Integer> is = insertPoint.getValue();
347
348 Way wnew = new Way(w);
349
350 pruneSuccsAndReverse(is);
351 for (int i : is) {
352 segSet.add(
353 Pair.sort(new Pair<Node,Node>(w.getNode(i), w.getNode(i+1))));
354 }
355 for (int i : is) {
356 wnew.addNode(i + 1, n);
357 }
358
359 // If ALT is pressed, a new way should be created and that new way should get
360 // selected. This works everytime unless the ways the nodes get inserted into
361 // are already selected. This is the case when creating a self-overlapping way
362 // but pressing ALT prevents this. Therefore we must de-select the way manually
363 // here so /only/ the new way will be selected after this method finishes.
364 if(alt) {
365 newSelection.add(insertPoint.getKey());
366 }
367
368 cmds.add(new ChangeCommand(insertPoint.getKey(), wnew));
369 replacedWays.add(insertPoint.getKey());
370 reuseWays.add(wnew);
371 }
372
373 adjustNode(segSet, n);
374 }
375 }
376
377 // This part decides whether or not a "segment" (i.e. a connection) is made to an
378 // existing node.
379
380 // For a connection to be made, the user must either have a node selected (connection
381 // is made to that node), or he must have a way selected *and* one of the endpoints
382 // of that way must be the last used node (connection is made to last used node), or
383 // he must have a way and a node selected (connection is made to the selected node).
384
385 // If the above does not apply, the selection is cleared and a new try is started
386
387 boolean extendedWay = false;
388 boolean wayIsFinishedTemp = wayIsFinished;
389 wayIsFinished = false;
390
391 // don't draw lines if shift is held
392 if (selection.size() > 0 && !shift) {
393 Node selectedNode = null;
394 Way selectedWay = null;
395
396 for (OsmPrimitive p : selection) {
397 if (p instanceof Node) {
398 if (selectedNode != null) {
399 // Too many nodes selected to do something useful
400 tryAgain(e);
401 return;
402 }
403 selectedNode = (Node) p;
404 } else if (p instanceof Way) {
405 if (selectedWay != null) {
406 // Too many ways selected to do something useful
407 tryAgain(e);
408 return;
409 }
410 selectedWay = (Way) p;
411 }
412 }
413
414 // the node from which we make a connection
415 Node n0 = findNodeToContinueFrom(selectedNode, selectedWay);
416 // We have a selection but it isn't suitable. Try again.
417 if(n0 == null) {
418 tryAgain(e);
419 return;
420 }
421 if(!wayIsFinishedTemp){
422 if(isSelfContainedWay(selectedWay, n0, n))
423 return;
424
425 // User clicked last node again, finish way
426 if(n0 == n) {
427 finishDrawing();
428 return;
429 }
430
431 // Ok we know now that we'll insert a line segment, but will it connect to an
432 // existing way or make a new way of its own? The "alt" modifier means that the
433 // user wants a new way.
434 Way way = alt ? null : (selectedWay != null) ? selectedWay : getWayForNode(n0);
435 Way wayToSelect;
436
437 // Don't allow creation of self-overlapping ways
438 if(way != null) {
439 int nodeCount=0;
440 for (Node p : way.getNodes())
441 if(p.equals(n0)) {
442 nodeCount++;
443 }
444 if(nodeCount > 1) {
445 way = null;
446 }
447 }
448
449 if (way == null) {
450 way = new Way();
451 way.addNode(n0);
452 cmds.add(new AddCommand(way));
453 wayToSelect = way;
454 } else {
455 int i;
456 if ((i = replacedWays.indexOf(way)) != -1) {
457 way = reuseWays.get(i);
458 wayToSelect = way;
459 } else {
460 wayToSelect = way;
461 Way wnew = new Way(way);
462 cmds.add(new ChangeCommand(way, wnew));
463 way = wnew;
464 }
465 }
466
467 // Connected to a node that's already in the way
468 if(way.containsNode(n)) {
469 wayIsFinished = true;
470 selection.clear();
471 }
472
473 // Add new node to way
474 if (way.getNode(way.getNodesCount() - 1) == n0) {
475 way.addNode(n);
476 } else {
477 way.addNode(0, n);
478 }
479
480 extendedWay = true;
481 newSelection.clear();
482 newSelection.add(wayToSelect);
483 }
484 }
485
486 String title;
487 if (!extendedWay) {
488 if (!newNode)
489 return; // We didn't do anything.
490 else if (reuseWays.isEmpty()) {
491 title = tr("Add node");
492 } else {
493 title = tr("Add node into way");
494 for (Way w : reuseWays) {
495 newSelection.remove(w);
496 }
497 }
498 newSelection.clear();
499 newSelection.add(n);
500 } else if (!newNode) {
501 title = tr("Connect existing way to node");
502 } else if (reuseWays.isEmpty()) {
503 title = tr("Add a new node to an existing way");
504 } else {
505 title = tr("Add node into way and connect");
506 }
507
508 Command c = new SequenceCommand(title, cmds);
509
510 Main.main.undoRedo.add(c);
511 if(!wayIsFinished) {
512 lastUsedNode = n;
513 }
514
515 getCurrentDataSet().setSelected(newSelection);
516
517 // "viewport following" mode for tracing long features
518 // from aerial imagery or GPS tracks.
519 if (n != null && Main.map.mapView.viewportFollowing) {
520 Main.map.mapView.smoothScrollTo(n.getEastNorth());
521 };
522 computeHelperLine();
523 removeHighlighting();
524 redrawIfRequired();
525 }
526
527 /**
528 * Prevent creation of ways that look like this: <---->
529 * This happens if users want to draw a no-exit-sideway from the main way like this:
530 * ^
531 * |<---->
532 * |
533 * The solution isn't ideal because the main way will end in the side way, which is bad for
534 * navigation software ("drive straight on") but at least easier to fix. Maybe users will fix
535 * it on their own, too. At least it's better than producing an error.
536 *
537 * @param Way the way to check
538 * @param Node the current node (i.e. the one the connection will be made from)
539 * @param Node the target node (i.e. the one the connection will be made to)
540 * @return Boolean True if this would create a selfcontaining way, false otherwise.
541 */
542 private boolean isSelfContainedWay(Way selectedWay, Node currentNode, Node targetNode) {
543 if(selectedWay != null) {
544 int posn0 = selectedWay.getNodes().indexOf(currentNode);
545 if( posn0 != -1 && // n0 is part of way
546 (posn0 >= 1 && targetNode.equals(selectedWay.getNode(posn0-1))) || // previous node
547 (posn0 < selectedWay.getNodesCount()-1) && targetNode.equals(selectedWay.getNode(posn0+1))) { // next node
548 getCurrentDataSet().setSelected(targetNode);
549 lastUsedNode = targetNode;
550 return true;
551 }
552 }
553
554 return false;
555 }
556
557 /**
558 * Finds a node to continue drawing from. Decision is based upon given node and way.
559 * @param selectedNode Currently selected node, may be null
560 * @param selectedWay Currently selected way, may be null
561 * @return Node if a suitable node is found, null otherwise
562 */
563 private Node findNodeToContinueFrom(Node selectedNode, Way selectedWay) {
564 // No nodes or ways have been selected, this occurs when a relation
565 // has been selected or the selection is empty
566 if(selectedNode == null && selectedWay == null)
567 return null;
568
569 if (selectedNode == null) {
570 if (selectedWay.isFirstLastNode(lastUsedNode))
571 return lastUsedNode;
572
573 // We have a way selected, but no suitable node to continue from. Start anew.
574 return null;
575 }
576
577 if (selectedWay == null)
578 return selectedNode;
579
580 if (selectedWay.isFirstLastNode(selectedNode))
581 return selectedNode;
582
583 // We have a way and node selected, but it's not at the start/end of the way. Start anew.
584 return null;
585 }
586
587 @Override public void mouseDragged(MouseEvent e) {
588 mouseMoved(e);
589 }
590
591 @Override public void mouseMoved(MouseEvent e) {
592 if(!Main.map.mapView.isActiveLayerDrawable())
593 return;
594
595 // we copy ctrl/alt/shift from the event just in case our global
596 // AWTEvent didn't make it through the security manager. Unclear
597 // if that can ever happen but better be safe.
598 updateKeyModifiers(e);
599 mousePos = e.getPoint();
600
601 computeHelperLine();
602 addHighlighting();
603 redrawIfRequired();
604 }
605
606 private void updateKeyModifiers(InputEvent e) {
607 ctrl = (e.getModifiers() & ActionEvent.CTRL_MASK) != 0;
608 alt = (e.getModifiers() & (ActionEvent.ALT_MASK|InputEvent.ALT_GRAPH_MASK)) != 0;
609 shift = (e.getModifiers() & ActionEvent.SHIFT_MASK) != 0;
610 }
611
612 private void updateKeyModifiers(MouseEvent e) {
613 ctrl = (e.getModifiers() & ActionEvent.CTRL_MASK) != 0;
614 alt = (e.getModifiers() & (ActionEvent.ALT_MASK|InputEvent.ALT_GRAPH_MASK)) != 0;
615 shift = (e.getModifiers() & ActionEvent.SHIFT_MASK) != 0;
616 }
617
618 /**
619 * This method prepares data required for painting the "helper line" from
620 * the last used position to the mouse cursor. It duplicates some code from
621 * mouseReleased() (FIXME).
622 */
623 private void computeHelperLine() {
624 MapView mv = Main.map.mapView;
625 if (mousePos == null) {
626 // Don't draw the line.
627 currentMouseEastNorth = null;
628 currentBaseNode = null;
629 return;
630 }
631
632 double distance = -1;
633 double angle = -1;
634
635 Collection<OsmPrimitive> selection = getCurrentDataSet().getSelected();
636
637 Node selectedNode = null;
638 Way selectedWay = null;
639 Node currentMouseNode = null;
640 mouseOnExistingNode = null;
641 mouseOnExistingWays = new HashSet<Way>();
642
643 Main.map.statusLine.setAngle(-1);
644 Main.map.statusLine.setHeading(-1);
645 Main.map.statusLine.setDist(-1);
646
647 if (!ctrl && mousePos != null) {
648 currentMouseNode = mv.getNearestNode(mousePos, OsmPrimitive.isSelectablePredicate);
649 }
650
651 // We need this for highlighting and we'll only do so if we actually want to re-use
652 // *and* there is no node nearby (because nodes beat ways when re-using)
653 if(!ctrl && currentMouseNode == null) {
654 List<WaySegment> wss = mv.getNearestWaySegments(mousePos, OsmPrimitive.isSelectablePredicate);
655 for(WaySegment ws : wss) {
656 mouseOnExistingWays.add(ws.way);
657 }
658 }
659
660 if (currentMouseNode != null) {
661 // user clicked on node
662 if (selection.isEmpty()) return;
663 currentMouseEastNorth = currentMouseNode.getEastNorth();
664 mouseOnExistingNode = currentMouseNode;
665 } else {
666 // no node found in clicked area
667 currentMouseEastNorth = mv.getEastNorth(mousePos.x, mousePos.y);
668 }
669
670 for (OsmPrimitive p : selection) {
671 if (p instanceof Node) {
672 if (selectedNode != null) return;
673 selectedNode = (Node) p;
674 } else if (p instanceof Way) {
675 if (selectedWay != null) return;
676 selectedWay = (Way) p;
677 }
678 }
679
680 // the node from which we make a connection
681 currentBaseNode = null;
682 Node previousNode = null;
683
684 if (selectedNode == null) {
685 if (selectedWay == null)
686 return;
687 if (selectedWay.isFirstLastNode(lastUsedNode)) {
688 currentBaseNode = lastUsedNode;
689 if (lastUsedNode == selectedWay.getNode(selectedWay.getNodesCount()-1) && selectedWay.getNodesCount() > 1) {
690 previousNode = selectedWay.getNode(selectedWay.getNodesCount()-2);
691 }
692 }
693 } else if (selectedWay == null) {
694 currentBaseNode = selectedNode;
695 } else {
696 if (selectedNode == selectedWay.getNode(0) || selectedNode == selectedWay.getNode(selectedWay.getNodesCount()-1)) {
697 currentBaseNode = selectedNode;
698 }
699 }
700
701 if (currentBaseNode == null || currentBaseNode == currentMouseNode)
702 return; // Don't create zero length way segments.
703
704 // find out the distance, in metres, between the base point and the mouse cursor
705 LatLon mouseLatLon = mv.getProjection().eastNorth2latlon(currentMouseEastNorth);
706 distance = currentBaseNode.getCoor().greatCircleDistance(mouseLatLon);
707
708 double hdg = Math.toDegrees(currentBaseNode.getEastNorth()
709 .heading(currentMouseEastNorth));
710 if (previousNode != null) {
711 angle = hdg - Math.toDegrees(previousNode.getEastNorth()
712 .heading(currentBaseNode.getEastNorth()));
713 angle += angle < 0 ? 360 : 0;
714 }
715
716 Main.map.statusLine.setAngle(angle);
717 Main.map.statusLine.setHeading(hdg);
718 Main.map.statusLine.setDist(distance);
719 // Now done in redrawIfRequired()
720 //updateStatusLine();
721 }
722
723 /**
724 * Repaint on mouse exit so that the helper line goes away.
725 */
726 @Override public void mouseExited(MouseEvent e) {
727 if(!Main.map.mapView.isActiveLayerDrawable())
728 return;
729 mousePos = e.getPoint();
730 Main.map.mapView.repaint();
731 }
732
733 /**
734 * @return If the node is the end of exactly one way, return this.
735 * <code>null</code> otherwise.
736 */
737 public Way getWayForNode(Node n) {
738 Way way = null;
739 for (Way w : OsmPrimitive.getFilteredList(n.getReferrers(), Way.class)) {
740 if (!w.isUsable() || w.getNodesCount() < 1) {
741 continue;
742 }
743 Node firstNode = w.getNode(0);
744 Node lastNode = w.getNode(w.getNodesCount() - 1);
745 if ((firstNode == n || lastNode == n) && (firstNode != lastNode)) {
746 if (way != null)
747 return null;
748 way = w;
749 }
750 }
751 return way;
752 }
753
754 public Node getCurrentBaseNode() {
755 return currentBaseNode;
756 }
757
758 private static void pruneSuccsAndReverse(List<Integer> is) {
759 //if (is.size() < 2) return;
760
761 HashSet<Integer> is2 = new HashSet<Integer>();
762 for (int i : is) {
763 if (!is2.contains(i - 1) && !is2.contains(i + 1)) {
764 is2.add(i);
765 }
766 }
767 is.clear();
768 is.addAll(is2);
769 Collections.sort(is);
770 Collections.reverse(is);
771 }
772
773 /**
774 * Adjusts the position of a node to lie on a segment (or a segment
775 * intersection).
776 *
777 * If one or more than two segments are passed, the node is adjusted
778 * to lie on the first segment that is passed.
779 *
780 * If two segments are passed, the node is adjusted to be at their
781 * intersection.
782 *
783 * No action is taken if no segments are passed.
784 *
785 * @param segs the segments to use as a reference when adjusting
786 * @param n the node to adjust
787 */
788 private static void adjustNode(Collection<Pair<Node,Node>> segs, Node n) {
789
790 switch (segs.size()) {
791 case 0:
792 return;
793 case 2:
794 // This computes the intersection between
795 // the two segments and adjusts the node position.
796 Iterator<Pair<Node,Node>> i = segs.iterator();
797 Pair<Node,Node> seg = i.next();
798 EastNorth A = seg.a.getEastNorth();
799 EastNorth B = seg.b.getEastNorth();
800 seg = i.next();
801 EastNorth C = seg.a.getEastNorth();
802 EastNorth D = seg.b.getEastNorth();
803
804 double u=det(B.east() - A.east(), B.north() - A.north(), C.east() - D.east(), C.north() - D.north());
805
806 // Check for parallel segments and do nothing if they are
807 // In practice this will probably only happen when a way has been duplicated
808
809 if (u == 0) return;
810
811 // q is a number between 0 and 1
812 // It is the point in the segment where the intersection occurs
813 // if the segment is scaled to lenght 1
814
815 double q = det(B.north() - C.north(), B.east() - C.east(), D.north() - C.north(), D.east() - C.east()) / u;
816 EastNorth intersection = new EastNorth(
817 B.east() + q * (A.east() - B.east()),
818 B.north() + q * (A.north() - B.north()));
819
820 int snapToIntersectionThreshold
821 = Main.pref.getInteger("edit.snap-intersection-threshold",10);
822
823 // only adjust to intersection if within snapToIntersectionThreshold pixel of mouse click; otherwise
824 // fall through to default action.
825 // (for semi-parallel lines, intersection might be miles away!)
826 if (Main.map.mapView.getPoint(n).distance(Main.map.mapView.getPoint(intersection)) < snapToIntersectionThreshold) {
827 n.setEastNorth(intersection);
828 return;
829 }
830
831 default:
832 EastNorth P = n.getEastNorth();
833 seg = segs.iterator().next();
834 A = seg.a.getEastNorth();
835 B = seg.b.getEastNorth();
836 double a = P.distanceSq(B);
837 double b = P.distanceSq(A);
838 double c = A.distanceSq(B);
839 q = (a - b + c) / (2*c);
840 n.setEastNorth(new EastNorth(B.east() + q * (A.east() - B.east()), B.north() + q * (A.north() - B.north())));
841 }
842 }
843
844 // helper for adjustNode
845 static double det(double a, double b, double c, double d) {
846 return a * d - b * c;
847 }
848
849 public void paint(Graphics2D g, MapView mv, Bounds box) {
850 if (!drawHelperLine || wayIsFinished || shift) return;
851
852 // sanity checks
853 if (Main.map.mapView == null) return;
854 if (mousePos == null) return;
855
856 // don't draw line if we don't know where from or where to
857 if (currentBaseNode == null || currentMouseEastNorth == null) return;
858
859 // don't draw line if mouse is outside window
860 if (!Main.map.mapView.getBounds().contains(mousePos)) return;
861
862 Graphics2D g2 = g;
863 g2.setColor(selectedColor);
864 g2.setStroke(new BasicStroke(3, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
865 GeneralPath b = new GeneralPath();
866 Point p1=mv.getPoint(currentBaseNode);
867 Point p2=mv.getPoint(currentMouseEastNorth);
868
869 double t = Math.atan2(p2.y-p1.y, p2.x-p1.x) + Math.PI;
870
871 b.moveTo(p1.x,p1.y); b.lineTo(p2.x, p2.y);
872
873 // if alt key is held ("start new way"), draw a little perpendicular line
874 if (alt) {
875 b.moveTo((int)(p1.x + 8*Math.cos(t+PHI)), (int)(p1.y + 8*Math.sin(t+PHI)));
876 b.lineTo((int)(p1.x + 8*Math.cos(t-PHI)), (int)(p1.y + 8*Math.sin(t-PHI)));
877 }
878
879 g2.draw(b);
880 g2.setStroke(new BasicStroke(1));
881 }
882
883 @Override public String getModeHelpText() {
884 String rv = "";
885 /*
886 * No modifiers: all (Connect, Node Re-Use, Auto-Weld)
887 * CTRL: disables node re-use, auto-weld
888 * Shift: do not make connection
889 * ALT: make connection but start new way in doing so
890 */
891
892 /*
893 * Status line text generation is split into two parts to keep it maintainable.
894 * First part looks at what will happen to the new node inserted on click and
895 * the second part will look if a connection is made or not.
896 *
897 * Note that this help text is not absolutely accurate as it doesn't catch any special
898 * cases (e.g. when preventing <---> ways). The only special that it catches is when
899 * a way is about to be finished.
900 *
901 * First check what happens to the new node.
902 */
903
904 // oldHighlights stores the current highlights. If this
905 // list is empty we can assume that we won't do any joins
906 if (ctrl || oldHighlights.isEmpty()) {
907 rv = tr("Create new node.");
908 } else {
909 // oldHighlights may store a node or way, check if it's a node
910 OsmPrimitive x = oldHighlights.iterator().next();
911 if (x instanceof Node) {
912 rv = tr("Select node under cursor.");
913 } else {
914 rv = trn("Insert new node into way.", "Insert new node into {0} ways.",
915 oldHighlights.size(), oldHighlights.size());
916 }
917 }
918
919 /*
920 * Check whether a connection will be made
921 */
922 if (currentBaseNode != null && !wayIsFinished) {
923 if (alt) {
924 rv += " " + tr("Start new way from last node.");
925 } else {
926 rv += " " + tr("Continue way from last node.");
927 }
928 }
929
930 Node n = mouseOnExistingNode;
931 /*
932 * Handle special case: Highlighted node == selected node => finish drawing
933 */
934 if (n != null && getCurrentDataSet() != null && getCurrentDataSet().getSelectedNodes().contains(n)) {
935 if (wayIsFinished) {
936 rv = tr("Select node under cursor.");
937 } else {
938 rv = tr("Finish drawing.");
939 }
940 }
941
942 /*
943 * Handle special case: Self-Overlapping or closing way
944 */
945 if (getCurrentDataSet() != null && getCurrentDataSet().getSelectedWays().size() > 0 && !wayIsFinished && !alt) {
946 Way w = getCurrentDataSet().getSelectedWays().iterator().next();
947 for (Node m : w.getNodes()) {
948 if (m.equals(mouseOnExistingNode) || mouseOnExistingWays.contains(w)) {
949 rv += " " + tr("Finish drawing.");
950 break;
951 }
952 }
953 }
954 return rv;
955 }
956
957 @Override public boolean layerIsSupported(Layer l) {
958 return l instanceof OsmDataLayer;
959 }
960
961 @Override
962 protected void updateEnabledState() {
963 setEnabled(getEditLayer() != null);
964 }
965
966 @Override
967 public void destroy() {
968 super.destroy();
969 Main.unregisterActionShortcut(extraShortcut);
970 }
971}
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