source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/DrawAction.java@ 14011

Last change on this file since 14011 was 14011, checked in by Don-vip, 6 years ago

spotbugs - IS2_INCONSISTENT_SYNC - currentMouseEastNorth; locked 62% of time
  • Property svn:eol-style set to native
File size: 55.0 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;
32import javax.swing.SwingUtilities;
33
34import org.openstreetmap.josm.Main;
35import org.openstreetmap.josm.actions.JosmAction;
36import org.openstreetmap.josm.command.AddCommand;
37import org.openstreetmap.josm.command.ChangeCommand;
38import org.openstreetmap.josm.command.Command;
39import org.openstreetmap.josm.command.SequenceCommand;
40import org.openstreetmap.josm.data.Bounds;
41import org.openstreetmap.josm.data.coor.EastNorth;
42import org.openstreetmap.josm.data.osm.DataSelectionListener;
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.event.SelectionEventManager;
49import org.openstreetmap.josm.data.osm.visitor.paint.ArrowPaintHelper;
50import org.openstreetmap.josm.data.osm.visitor.paint.PaintColors;
51import org.openstreetmap.josm.data.preferences.AbstractProperty;
52import org.openstreetmap.josm.data.preferences.BooleanProperty;
53import org.openstreetmap.josm.data.preferences.CachingProperty;
54import org.openstreetmap.josm.data.preferences.DoubleProperty;
55import org.openstreetmap.josm.data.preferences.NamedColorProperty;
56import org.openstreetmap.josm.data.preferences.StrokeProperty;
57import org.openstreetmap.josm.gui.MainApplication;
58import org.openstreetmap.josm.gui.MainMenu;
59import org.openstreetmap.josm.gui.MapFrame;
60import org.openstreetmap.josm.gui.MapView;
61import org.openstreetmap.josm.gui.MapViewState.MapViewPoint;
62import org.openstreetmap.josm.gui.NavigatableComponent;
63import org.openstreetmap.josm.gui.draw.MapPath2D;
64import org.openstreetmap.josm.gui.layer.Layer;
65import org.openstreetmap.josm.gui.layer.MapViewPaintable;
66import org.openstreetmap.josm.gui.layer.OsmDataLayer;
67import org.openstreetmap.josm.gui.util.KeyPressReleaseListener;
68import org.openstreetmap.josm.gui.util.ModifierExListener;
69import org.openstreetmap.josm.tools.Geometry;
70import org.openstreetmap.josm.tools.ImageProvider;
71import org.openstreetmap.josm.tools.Pair;
72import org.openstreetmap.josm.tools.Shortcut;
73import org.openstreetmap.josm.tools.Utils;
74
75/**
76 * Mapmode to add nodes, create and extend ways.
77 */
78public class DrawAction extends MapMode implements MapViewPaintable, DataSelectionListener, KeyPressReleaseListener, ModifierExListener {
79
80 /**
81 * If this property is set, the draw action moves the viewport when adding new points.
82 * @since 12182
83 */
84 public static final CachingProperty<Boolean> VIEWPORT_FOLLOWING = new BooleanProperty("draw.viewport.following", false).cached();
85
86 private static final Color ORANGE_TRANSPARENT = new Color(Color.ORANGE.getRed(), Color.ORANGE.getGreen(), Color.ORANGE.getBlue(), 128);
87
88 private static final ArrowPaintHelper START_WAY_INDICATOR = new ArrowPaintHelper(Utils.toRadians(90), 8);
89
90 static final CachingProperty<Boolean> USE_REPEATED_SHORTCUT
91 = new BooleanProperty("draw.anglesnap.toggleOnRepeatedA", true).cached();
92 static final CachingProperty<BasicStroke> RUBBER_LINE_STROKE
93 = new StrokeProperty("draw.stroke.helper-line", "3").cached();
94
95 static final CachingProperty<BasicStroke> HIGHLIGHT_STROKE
96 = new StrokeProperty("draw.anglesnap.stroke.highlight", "10").cached();
97 static final CachingProperty<BasicStroke> HELPER_STROKE
98 = new StrokeProperty("draw.anglesnap.stroke.helper", "1 4").cached();
99
100 static final CachingProperty<Double> SNAP_ANGLE_TOLERANCE
101 = new DoubleProperty("draw.anglesnap.tolerance", 5.0).cached();
102 static final CachingProperty<Boolean> DRAW_CONSTRUCTION_GEOMETRY
103 = new BooleanProperty("draw.anglesnap.drawConstructionGeometry", true).cached();
104 static final CachingProperty<Boolean> SHOW_PROJECTED_POINT
105 = new BooleanProperty("draw.anglesnap.drawProjectedPoint", true).cached();
106 static final CachingProperty<Boolean> SNAP_TO_PROJECTIONS
107 = new BooleanProperty("draw.anglesnap.projectionsnap", true).cached();
108
109 static final CachingProperty<Boolean> SHOW_ANGLE
110 = new BooleanProperty("draw.anglesnap.showAngle", true).cached();
111
112 static final CachingProperty<Color> SNAP_HELPER_COLOR
113 = new NamedColorProperty(marktr("draw angle snap"), Color.ORANGE).cached();
114
115 static final CachingProperty<Color> HIGHLIGHT_COLOR
116 = new NamedColorProperty(marktr("draw angle snap highlight"), ORANGE_TRANSPARENT).cached();
117
118 static final AbstractProperty<Color> RUBBER_LINE_COLOR
119 = PaintColors.SELECTED.getProperty().getChildColor(marktr("helper line"));
120
121 static final CachingProperty<Boolean> DRAW_HELPER_LINE
122 = new BooleanProperty("draw.helper-line", true).cached();
123 static final CachingProperty<Boolean> DRAW_TARGET_HIGHLIGHT
124 = new BooleanProperty("draw.target-highlight", true).cached();
125 static final CachingProperty<Double> SNAP_TO_INTERSECTION_THRESHOLD
126 = new DoubleProperty("edit.snap-intersection-threshold", 10).cached();
127
128 private final Cursor cursorJoinNode;
129 private final Cursor cursorJoinWay;
130
131 private transient Node lastUsedNode;
132 private double toleranceMultiplier;
133
134 private transient Node mouseOnExistingNode;
135 private transient Set<Way> mouseOnExistingWays = new HashSet<>();
136 // old highlights store which primitives are currently highlighted. This
137 // is true, even if target highlighting is disabled since the status bar
138 // derives its information from this list as well.
139 private transient Set<OsmPrimitive> oldHighlights = new HashSet<>();
140 // new highlights contains a list of primitives that should be highlighted
141 // but haven't been so far. The idea is to compare old and new and only
142 // repaint if there are changes.
143 private transient Set<OsmPrimitive> newHighlights = new HashSet<>();
144 private boolean wayIsFinished;
145 private Point mousePos;
146 private Point oldMousePos;
147
148 private transient Node currentBaseNode;
149 private transient Node previousNode;
150 private EastNorth currentMouseEastNorth;
151
152 private final transient DrawSnapHelper snapHelper = new DrawSnapHelper(this);
153
154 private final transient Shortcut backspaceShortcut;
155 private final BackSpaceAction backspaceAction;
156 private final transient Shortcut snappingShortcut;
157 private boolean ignoreNextKeyRelease;
158
159 private final SnapChangeAction snapChangeAction;
160 private final JCheckBoxMenuItem snapCheckboxMenuItem;
161 private static final BasicStroke BASIC_STROKE = new BasicStroke(1);
162
163 private Point rightClickPressPos;
164
165 /**
166 * Constructs a new {@code DrawAction}.
167 * @since 11713
168 */
169 public DrawAction() {
170 super(tr("Draw"), "node/autonode", tr("Draw nodes"),
171 Shortcut.registerShortcut("mapmode:draw", tr("Mode: {0}", tr("Draw")), KeyEvent.VK_A, Shortcut.DIRECT),
172 ImageProvider.getCursor("crosshair", null));
173
174 snappingShortcut = Shortcut.registerShortcut("mapmode:drawanglesnapping",
175 tr("Mode: Draw Angle snapping"), KeyEvent.CHAR_UNDEFINED, Shortcut.NONE);
176 snapChangeAction = new SnapChangeAction();
177 snapCheckboxMenuItem = addMenuItem();
178 snapHelper.setMenuCheckBox(snapCheckboxMenuItem);
179 backspaceShortcut = Shortcut.registerShortcut("mapmode:backspace",
180 tr("Backspace in Add mode"), KeyEvent.VK_BACK_SPACE, Shortcut.DIRECT);
181 backspaceAction = new BackSpaceAction();
182 cursorJoinNode = ImageProvider.getCursor("crosshair", "joinnode");
183 cursorJoinWay = ImageProvider.getCursor("crosshair", "joinway");
184
185 snapHelper.init();
186 }
187
188 private JCheckBoxMenuItem addMenuItem() {
189 int n = MainApplication.getMenu().editMenu.getItemCount();
190 for (int i = n-1; i > 0; i--) {
191 JMenuItem item = MainApplication.getMenu().editMenu.getItem(i);
192 if (item != null && item.getAction() != null && item.getAction() instanceof SnapChangeAction) {
193 MainApplication.getMenu().editMenu.remove(i);
194 }
195 }
196 return MainMenu.addWithCheckbox(MainApplication.getMenu().editMenu, snapChangeAction, MainMenu.WINDOW_MENU_GROUP.VOLATILE);
197 }
198
199 /**
200 * Checks if a map redraw is required and does so if needed. Also updates the status bar.
201 * @param e event, can be null
202 * @return true if a repaint is needed
203 */
204 private boolean redrawIfRequired(Object e) {
205 updateStatusLine();
206 // repaint required if the helper line is active.
207 boolean needsRepaint = DRAW_HELPER_LINE.get() && !wayIsFinished;
208 if (DRAW_TARGET_HIGHLIGHT.get()) {
209 // move newHighlights to oldHighlights; only update changed primitives
210 for (OsmPrimitive x : newHighlights) {
211 if (oldHighlights.contains(x)) {
212 continue;
213 }
214 x.setHighlighted(true);
215 needsRepaint = true;
216 }
217 oldHighlights.removeAll(newHighlights);
218 for (OsmPrimitive x : oldHighlights) {
219 x.setHighlighted(false);
220 needsRepaint = true;
221 }
222 }
223 // required in order to print correct help text
224 oldHighlights = newHighlights;
225
226 if (!needsRepaint && !DRAW_TARGET_HIGHLIGHT.get())
227 return false;
228
229 // update selection to reflect which way being modified
230 OsmDataLayer editLayer = getLayerManager().getEditLayer();
231 Node baseNode = getCurrentBaseNode();
232 if (editLayer != null && baseNode != null && !editLayer.data.selectionEmpty()) {
233 DataSet currentDataSet = editLayer.getDataSet();
234 Way continueFrom = getWayForNode(baseNode);
235 if (alt && continueFrom != null && (!baseNode.isSelected() || continueFrom.isSelected())) {
236 addRemoveSelection(currentDataSet, baseNode, continueFrom);
237 needsRepaint = true;
238 } else if (!alt && continueFrom != null && !continueFrom.isSelected()) {
239 addSelection(currentDataSet, continueFrom);
240 needsRepaint = true;
241 }
242 }
243
244 if (!needsRepaint && e instanceof SelectionChangeEvent) {
245 SelectionChangeEvent event = (SelectionChangeEvent) e;
246 needsRepaint = !event.getOldSelection().isEmpty() && event.getSelection().isEmpty();
247 }
248
249 if (needsRepaint && editLayer != null) {
250 editLayer.invalidate();
251 }
252 return needsRepaint;
253 }
254
255 private static void addRemoveSelection(DataSet ds, OsmPrimitive toAdd, OsmPrimitive toRemove) {
256 ds.beginUpdate(); // to prevent the selection listener to screw around with the state
257 try {
258 addSelection(ds, toAdd);
259 clearSelection(ds, toRemove);
260 } finally {
261 ds.endUpdate();
262 }
263 }
264
265 private static void updatePreservedFlag(OsmPrimitive osm, boolean state) {
266 // Preserves selected primitives and selected way nodes
267 osm.setPreserved(state);
268 if (osm instanceof Way) {
269 for (Node n : ((Way) osm).getNodes()) {
270 n.setPreserved(state);
271 }
272 }
273 }
274
275 private static void setSelection(DataSet ds, Collection<OsmPrimitive> toSet) {
276 toSet.stream().forEach(x -> updatePreservedFlag(x, true));
277 ds.setSelected(toSet);
278 }
279
280 private static void setSelection(DataSet ds, OsmPrimitive toSet) {
281 updatePreservedFlag(toSet, true);
282 ds.setSelected(toSet);
283 }
284
285 private static void addSelection(DataSet ds, OsmPrimitive toAdd) {
286 updatePreservedFlag(toAdd, true);
287 ds.addSelected(toAdd);
288 }
289
290 private static void clearSelection(DataSet ds, OsmPrimitive toRemove) {
291 ds.clearSelection(toRemove);
292 updatePreservedFlag(toRemove, false);
293 }
294
295 @Override
296 public void enterMode() {
297 if (!isEnabled())
298 return;
299 super.enterMode();
300 readPreferences();
301
302 // determine if selection is suitable to continue drawing. If it
303 // isn't, set wayIsFinished to true to avoid superfluous repaints.
304 determineCurrentBaseNodeAndPreviousNode(getLayerManager().getEditDataSet().getSelected());
305 wayIsFinished = getCurrentBaseNode() == null;
306
307 toleranceMultiplier = 0.01 * NavigatableComponent.PROP_SNAP_DISTANCE.get();
308
309 snapHelper.init();
310 snapCheckboxMenuItem.getAction().setEnabled(true);
311
312 MapFrame map = MainApplication.getMap();
313 map.statusLine.getAnglePanel().addMouseListener(snapHelper.anglePopupListener);
314 MainApplication.registerActionShortcut(backspaceAction, backspaceShortcut);
315
316 map.mapView.addMouseListener(this);
317 map.mapView.addMouseMotionListener(this);
318 map.mapView.addTemporaryLayer(this);
319 SelectionEventManager.getInstance().addSelectionListenerForEdt(this);
320
321 map.keyDetector.addKeyListener(this);
322 map.keyDetector.addModifierExListener(this);
323 ignoreNextKeyRelease = true;
324 }
325
326 @Override
327 public void exitMode() {
328 super.exitMode();
329 MapFrame map = MainApplication.getMap();
330 map.mapView.removeMouseListener(this);
331 map.mapView.removeMouseMotionListener(this);
332 map.mapView.removeTemporaryLayer(this);
333 SelectionEventManager.getInstance().removeSelectionListener(this);
334 MainApplication.unregisterActionShortcut(backspaceAction, backspaceShortcut);
335 snapHelper.unsetFixedMode();
336 snapCheckboxMenuItem.getAction().setEnabled(false);
337
338 map.statusLine.getAnglePanel().removeMouseListener(snapHelper.anglePopupListener);
339 map.statusLine.activateAnglePanel(false);
340
341 DataSet ds = getLayerManager().getEditDataSet();
342 if (ds != null) {
343 ds.getSelected().stream().forEach(x -> updatePreservedFlag(x, false));
344 }
345
346 removeHighlighting(null);
347 map.keyDetector.removeKeyListener(this);
348 map.keyDetector.removeModifierExListener(this);
349 }
350
351 /**
352 * redraw to (possibly) get rid of helper line if selection changes.
353 */
354 @Override
355 public void modifiersExChanged(int modifiers) {
356 if (!MainApplication.isDisplayingMapView() || !MainApplication.getMap().mapView.isActiveLayerDrawable())
357 return;
358 updateKeyModifiersEx(modifiers);
359 computeHelperLine();
360 addHighlighting(null);
361 }
362
363 @Override
364 public void doKeyPressed(KeyEvent e) {
365 if (!snappingShortcut.isEvent(e) && !(USE_REPEATED_SHORTCUT.get() && getShortcut().isEvent(e)))
366 return;
367 snapHelper.setFixedMode();
368 computeHelperLine();
369 redrawIfRequired(e);
370 }
371
372 @Override
373 public void doKeyReleased(KeyEvent e) {
374 if (!snappingShortcut.isEvent(e) && !(USE_REPEATED_SHORTCUT.get() && getShortcut().isEvent(e)))
375 return;
376 if (ignoreNextKeyRelease) {
377 ignoreNextKeyRelease = false;
378 return;
379 }
380 snapHelper.unFixOrTurnOff();
381 computeHelperLine();
382 redrawIfRequired(e);
383 }
384
385 /**
386 * redraw to (possibly) get rid of helper line if selection changes.
387 */
388 @Override
389 public void selectionChanged(SelectionChangeEvent event) {
390 if (!MainApplication.getMap().mapView.isActiveLayerDrawable())
391 return;
392 // Make sure helper line is computed later (causes deadlock in selection event chain otherwise)
393 SwingUtilities.invokeLater(() -> {
394 event.getOldSelection().stream().forEach(x -> updatePreservedFlag(x, false));
395 event.getSelection().stream().forEach(x -> updatePreservedFlag(x, true));
396 if (MainApplication.getMap() != null) {
397 computeHelperLine();
398 addHighlighting(event);
399 }
400 });
401 }
402
403 private void tryAgain(MouseEvent e) {
404 getLayerManager().getEditDataSet().clearSelection();
405 mouseReleased(e);
406 }
407
408 /**
409 * This function should be called when the user wishes to finish his current draw action.
410 * If Potlatch Style is enabled, it will switch to select tool, otherwise simply disable
411 * the helper line until the user chooses to draw something else.
412 */
413 private void finishDrawing() {
414 lastUsedNode = null;
415 wayIsFinished = true;
416 MainApplication.getMap().selectSelectTool(true);
417 snapHelper.noSnapNow();
418
419 // Redraw to remove the helper line stub
420 computeHelperLine();
421 removeHighlighting(null);
422 }
423
424 @Override
425 public void mousePressed(MouseEvent e) {
426 if (e.getButton() == MouseEvent.BUTTON3) {
427 rightClickPressPos = e.getPoint();
428 }
429 }
430
431 /**
432 * If user clicked with the left button, add a node at the current mouse
433 * position.
434 *
435 * If in nodeway mode, insert the node into the way.
436 */
437 @Override
438 public void mouseReleased(MouseEvent e) {
439 if (e.getButton() == MouseEvent.BUTTON3) {
440 Point curMousePos = e.getPoint();
441 if (curMousePos.equals(rightClickPressPos)) {
442 tryToSetBaseSegmentForAngleSnap();
443 }
444 return;
445 }
446 if (e.getButton() != MouseEvent.BUTTON1)
447 return;
448 MapView mapView = MainApplication.getMap().mapView;
449 if (!mapView.isActiveLayerDrawable())
450 return;
451 // request focus in order to enable the expected keyboard shortcuts
452 //
453 mapView.requestFocus();
454
455 if (e.getClickCount() > 1 && mousePos != null && mousePos.equals(oldMousePos)) {
456 // A double click equals "user clicked last node again, finish way"
457 // Change draw tool only if mouse position is nearly the same, as
458 // otherwise fast clicks will count as a double click
459 finishDrawing();
460 return;
461 }
462 oldMousePos = mousePos;
463
464 // we copy ctrl/alt/shift from the event just in case our global
465 // keyDetector didn't make it through the security manager. Unclear
466 // if that can ever happen but better be safe.
467 updateKeyModifiers(e);
468 mousePos = e.getPoint();
469
470 DataSet ds = getLayerManager().getEditDataSet();
471 Collection<OsmPrimitive> selection = new ArrayList<>(ds.getSelected());
472
473 boolean newNode = false;
474 Node n = mapView.getNearestNode(mousePos, OsmPrimitive::isSelectable);
475 if (ctrl) {
476 Iterator<Way> it = ds.getSelectedWays().iterator();
477 if (it.hasNext()) {
478 // ctrl-click on node of selected way = reuse node despite of ctrl
479 if (!it.next().containsNode(n)) n = null;
480 } else {
481 n = null; // ctrl-click + no selected way = new node
482 }
483 }
484
485 if (n != null && !snapHelper.isActive()) {
486 // user clicked on node
487 if (selection.isEmpty() || wayIsFinished) {
488 // select the clicked node and do nothing else
489 // (this is just a convenience option so that people don't
490 // have to switch modes)
491
492 setSelection(ds, n);
493 // If we extend/continue an existing way, select it already now to make it obvious
494 Way continueFrom = getWayForNode(n);
495 if (continueFrom != null) {
496 addSelection(ds, continueFrom);
497 }
498
499 // The user explicitly selected a node, so let him continue drawing
500 wayIsFinished = false;
501 return;
502 }
503 } else {
504 EastNorth newEN;
505 if (n != null) {
506 EastNorth foundPoint = n.getEastNorth();
507 // project found node to snapping line
508 newEN = snapHelper.getSnapPoint(foundPoint);
509 // do not add new node if there is some node within snapping distance
510 double tolerance = mapView.getDist100Pixel() * toleranceMultiplier;
511 if (foundPoint.distance(newEN) > tolerance) {
512 n = new Node(newEN); // point != projected, so we create new node
513 newNode = true;
514 }
515 } else { // n==null, no node found in clicked area
516 EastNorth mouseEN = mapView.getEastNorth(e.getX(), e.getY());
517 newEN = snapHelper.isSnapOn() ? snapHelper.getSnapPoint(mouseEN) : mouseEN;
518 n = new Node(newEN); //create node at clicked point
519 newNode = true;
520 }
521 snapHelper.unsetFixedMode();
522 }
523
524 Collection<Command> cmds = new LinkedList<>();
525 Collection<OsmPrimitive> newSelection = new LinkedList<>(ds.getSelected());
526 List<Way> reuseWays = new ArrayList<>();
527 List<Way> replacedWays = new ArrayList<>();
528
529 if (newNode) {
530 if (n.getCoor().isOutSideWorld()) {
531 JOptionPane.showMessageDialog(
532 Main.parent,
533 tr("Cannot add a node outside of the world."),
534 tr("Warning"),
535 JOptionPane.WARNING_MESSAGE
536 );
537 return;
538 }
539 cmds.add(new AddCommand(ds, n));
540
541 if (!ctrl) {
542 // Insert the node into all the nearby way segments
543 List<WaySegment> wss = mapView.getNearestWaySegments(
544 mapView.getPoint(n), OsmPrimitive::isSelectable);
545 if (snapHelper.isActive()) {
546 tryToMoveNodeOnIntersection(wss, n);
547 }
548 insertNodeIntoAllNearbySegments(wss, n, newSelection, cmds, replacedWays, reuseWays);
549 }
550 }
551 // now "n" is newly created or reused node that shoud be added to some way
552
553 // This part decides whether or not a "segment" (i.e. a connection) is made to an existing node.
554
555 // For a connection to be made, the user must either have a node selected (connection
556 // is made to that node), or he must have a way selected *and* one of the endpoints
557 // of that way must be the last used node (connection is made to last used node), or
558 // he must have a way and a node selected (connection is made to the selected node).
559
560 // If the above does not apply, the selection is cleared and a new try is started
561
562 boolean extendedWay = false;
563 boolean wayIsFinishedTemp = wayIsFinished;
564 wayIsFinished = false;
565
566 // don't draw lines if shift is held
567 if (!selection.isEmpty() && !shift) {
568 Node selectedNode = null;
569 Way selectedWay = null;
570
571 for (OsmPrimitive p : selection) {
572 if (p instanceof Node) {
573 if (selectedNode != null) {
574 // Too many nodes selected to do something useful
575 tryAgain(e);
576 return;
577 }
578 selectedNode = (Node) p;
579 } else if (p instanceof Way) {
580 if (selectedWay != null) {
581 // Too many ways selected to do something useful
582 tryAgain(e);
583 return;
584 }
585 selectedWay = (Way) p;
586 }
587 }
588
589 // the node from which we make a connection
590 Node n0 = findNodeToContinueFrom(selectedNode, selectedWay);
591 // We have a selection but it isn't suitable. Try again.
592 if (n0 == null) {
593 tryAgain(e);
594 return;
595 }
596 if (!wayIsFinishedTemp) {
597 if (isSelfContainedWay(selectedWay, n0, n))
598 return;
599
600 // User clicked last node again, finish way
601 if (n0 == n) {
602 finishDrawing();
603 return;
604 }
605
606 // Ok we know now that we'll insert a line segment, but will it connect to an
607 // existing way or make a new way of its own? The "alt" modifier means that the
608 // user wants a new way.
609 Way way = alt ? null : (selectedWay != null ? selectedWay : getWayForNode(n0));
610 Way wayToSelect;
611
612 // Don't allow creation of self-overlapping ways
613 if (way != null) {
614 int nodeCount = 0;
615 for (Node p : way.getNodes()) {
616 if (p.equals(n0)) {
617 nodeCount++;
618 }
619 }
620 if (nodeCount > 1) {
621 way = null;
622 }
623 }
624
625 if (way == null) {
626 way = new Way();
627 way.addNode(n0);
628 cmds.add(new AddCommand(ds, way));
629 wayToSelect = way;
630 } else {
631 int i;
632 if ((i = replacedWays.indexOf(way)) != -1) {
633 way = reuseWays.get(i);
634 wayToSelect = way;
635 } else {
636 wayToSelect = way;
637 Way wnew = new Way(way);
638 cmds.add(new ChangeCommand(way, wnew));
639 way = wnew;
640 }
641 }
642
643 // Connected to a node that's already in the way
644 if (way.containsNode(n)) {
645 wayIsFinished = true;
646 selection.clear();
647 }
648
649 // Add new node to way
650 if (way.getNode(way.getNodesCount() - 1) == n0) {
651 way.addNode(n);
652 } else {
653 way.addNode(0, n);
654 }
655
656 extendedWay = true;
657 newSelection.clear();
658 newSelection.add(wayToSelect);
659 }
660 }
661 if (!extendedWay && !newNode) {
662 return; // We didn't do anything.
663 }
664
665 String title = getTitle(newNode, n, newSelection, reuseWays, extendedWay);
666
667 Command c = new SequenceCommand(title, cmds);
668
669 MainApplication.undoRedo.add(c);
670 if (!wayIsFinished) {
671 lastUsedNode = n;
672 }
673
674 setSelection(ds, newSelection);
675
676 // "viewport following" mode for tracing long features
677 // from aerial imagery or GPS tracks.
678 if (VIEWPORT_FOLLOWING.get()) {
679 mapView.smoothScrollTo(n.getEastNorth());
680 }
681 computeHelperLine();
682 removeHighlighting(e);
683 }
684
685 private static String getTitle(boolean newNode, Node n, Collection<OsmPrimitive> newSelection, List<Way> reuseWays,
686 boolean extendedWay) {
687 String title;
688 if (!extendedWay) {
689 if (reuseWays.isEmpty()) {
690 title = tr("Add node");
691 } else {
692 title = tr("Add node into way");
693 for (Way w : reuseWays) {
694 newSelection.remove(w);
695 }
696 }
697 newSelection.clear();
698 newSelection.add(n);
699 } else if (!newNode) {
700 title = tr("Connect existing way to node");
701 } else if (reuseWays.isEmpty()) {
702 title = tr("Add a new node to an existing way");
703 } else {
704 title = tr("Add node into way and connect");
705 }
706 return title;
707 }
708
709 private void insertNodeIntoAllNearbySegments(List<WaySegment> wss, Node n, Collection<OsmPrimitive> newSelection,
710 Collection<Command> cmds, List<Way> replacedWays, List<Way> reuseWays) {
711 Map<Way, List<Integer>> insertPoints = new HashMap<>();
712 for (WaySegment ws : wss) {
713 List<Integer> is;
714 if (insertPoints.containsKey(ws.way)) {
715 is = insertPoints.get(ws.way);
716 } else {
717 is = new ArrayList<>();
718 insertPoints.put(ws.way, is);
719 }
720
721 is.add(ws.lowerIndex);
722 }
723
724 Set<Pair<Node, Node>> segSet = new HashSet<>();
725
726 for (Map.Entry<Way, List<Integer>> insertPoint : insertPoints.entrySet()) {
727 Way w = insertPoint.getKey();
728 List<Integer> is = insertPoint.getValue();
729
730 Way wnew = new Way(w);
731
732 pruneSuccsAndReverse(is);
733 for (int i : is) {
734 segSet.add(Pair.sort(new Pair<>(w.getNode(i), w.getNode(i+1))));
735 wnew.addNode(i + 1, n);
736 }
737
738 // If ALT is pressed, a new way should be created and that new way should get
739 // selected. This works everytime unless the ways the nodes get inserted into
740 // are already selected. This is the case when creating a self-overlapping way
741 // but pressing ALT prevents this. Therefore we must de-select the way manually
742 // here so /only/ the new way will be selected after this method finishes.
743 if (alt) {
744 newSelection.add(insertPoint.getKey());
745 }
746
747 cmds.add(new ChangeCommand(insertPoint.getKey(), wnew));
748 replacedWays.add(insertPoint.getKey());
749 reuseWays.add(wnew);
750 }
751
752 adjustNode(segSet, n);
753 }
754
755 /**
756 * Prevent creation of ways that look like this: &lt;----&gt;
757 * This happens if users want to draw a no-exit-sideway from the main way like this:
758 * ^
759 * |&lt;----&gt;
760 * |
761 * The solution isn't ideal because the main way will end in the side way, which is bad for
762 * navigation software ("drive straight on") but at least easier to fix. Maybe users will fix
763 * it on their own, too. At least it's better than producing an error.
764 *
765 * @param selectedWay the way to check
766 * @param currentNode the current node (i.e. the one the connection will be made from)
767 * @param targetNode the target node (i.e. the one the connection will be made to)
768 * @return {@code true} if this would create a selfcontaining way, {@code false} otherwise.
769 */
770 private boolean isSelfContainedWay(Way selectedWay, Node currentNode, Node targetNode) {
771 if (selectedWay != null) {
772 int posn0 = selectedWay.getNodes().indexOf(currentNode);
773 // CHECKSTYLE.OFF: SingleSpaceSeparator
774 if ((posn0 != -1 && // n0 is part of way
775 (posn0 >= 1 && targetNode.equals(selectedWay.getNode(posn0-1)))) || // previous node
776 (posn0 < selectedWay.getNodesCount()-1 && targetNode.equals(selectedWay.getNode(posn0+1)))) { // next node
777 setSelection(getLayerManager().getEditDataSet(), targetNode);
778 lastUsedNode = targetNode;
779 return true;
780 }
781 // CHECKSTYLE.ON: SingleSpaceSeparator
782 }
783
784 return false;
785 }
786
787 /**
788 * Finds a node to continue drawing from. Decision is based upon given node and way.
789 * @param selectedNode Currently selected node, may be null
790 * @param selectedWay Currently selected way, may be null
791 * @return Node if a suitable node is found, null otherwise
792 */
793 private Node findNodeToContinueFrom(Node selectedNode, Way selectedWay) {
794 // No nodes or ways have been selected, this occurs when a relation
795 // has been selected or the selection is empty
796 if (selectedNode == null && selectedWay == null)
797 return null;
798
799 if (selectedNode == null) {
800 if (selectedWay.isFirstLastNode(lastUsedNode))
801 return lastUsedNode;
802
803 // We have a way selected, but no suitable node to continue from. Start anew.
804 return null;
805 }
806
807 if (selectedWay == null)
808 return selectedNode;
809
810 if (selectedWay.isFirstLastNode(selectedNode))
811 return selectedNode;
812
813 // We have a way and node selected, but it's not at the start/end of the way. Start anew.
814 return null;
815 }
816
817 @Override
818 public void mouseDragged(MouseEvent e) {
819 mouseMoved(e);
820 }
821
822 @Override
823 public void mouseMoved(MouseEvent e) {
824 if (!MainApplication.getMap().mapView.isActiveLayerDrawable())
825 return;
826
827 // we copy ctrl/alt/shift from the event just in case our global
828 // keyDetector didn't make it through the security manager. Unclear
829 // if that can ever happen but better be safe.
830 updateKeyModifiers(e);
831 mousePos = e.getPoint();
832 if (snapHelper.isSnapOn() && ctrl)
833 tryToSetBaseSegmentForAngleSnap();
834
835 computeHelperLine();
836 addHighlighting(e);
837 }
838
839 /**
840 * This method is used to detect segment under mouse and use it as reference for angle snapping
841 */
842 private void tryToSetBaseSegmentForAngleSnap() {
843 if (mousePos != null) {
844 WaySegment seg = MainApplication.getMap().mapView.getNearestWaySegment(mousePos, OsmPrimitive::isSelectable);
845 if (seg != null) {
846 snapHelper.setBaseSegment(seg);
847 }
848 }
849 }
850
851 /**
852 * This method prepares data required for painting the "helper line" from
853 * the last used position to the mouse cursor. It duplicates some code from
854 * mouseReleased() (FIXME).
855 */
856 private synchronized void computeHelperLine() {
857 if (mousePos == null) {
858 // Don't draw the line.
859 currentMouseEastNorth = null;
860 currentBaseNode = null;
861 return;
862 }
863
864 DataSet ds = getLayerManager().getEditDataSet();
865 Collection<OsmPrimitive> selection = ds != null ? ds.getSelected() : Collections.emptyList();
866
867 MapView mv = MainApplication.getMap().mapView;
868 Node currentMouseNode = null;
869 mouseOnExistingNode = null;
870 mouseOnExistingWays = new HashSet<>();
871
872 if (!ctrl && mousePos != null) {
873 currentMouseNode = mv.getNearestNode(mousePos, OsmPrimitive::isSelectable);
874 }
875
876 // We need this for highlighting and we'll only do so if we actually want to re-use
877 // *and* there is no node nearby (because nodes beat ways when re-using)
878 if (!ctrl && currentMouseNode == null) {
879 List<WaySegment> wss = mv.getNearestWaySegments(mousePos, OsmPrimitive::isSelectable);
880 for (WaySegment ws : wss) {
881 mouseOnExistingWays.add(ws.way);
882 }
883 }
884
885 if (currentMouseNode != null) {
886 // user clicked on node
887 if (selection.isEmpty()) return;
888 currentMouseEastNorth = currentMouseNode.getEastNorth();
889 mouseOnExistingNode = currentMouseNode;
890 } else {
891 // no node found in clicked area
892 currentMouseEastNorth = mv.getEastNorth(mousePos.x, mousePos.y);
893 }
894
895 determineCurrentBaseNodeAndPreviousNode(selection);
896 if (previousNode == null) {
897 snapHelper.noSnapNow();
898 }
899
900 if (getCurrentBaseNode() == null || getCurrentBaseNode() == currentMouseNode)
901 return; // Don't create zero length way segments.
902
903 showStatusInfo(-1, -1, -1, snapHelper.isSnapOn());
904
905 double curHdg = Utils.toDegrees(getCurrentBaseNode().getEastNorth()
906 .heading(currentMouseEastNorth));
907 double baseHdg = -1;
908 if (previousNode != null) {
909 EastNorth en = previousNode.getEastNorth();
910 if (en != null) {
911 baseHdg = Utils.toDegrees(en.heading(getCurrentBaseNode().getEastNorth()));
912 }
913 }
914
915 snapHelper.checkAngleSnapping(currentMouseEastNorth, baseHdg, curHdg);
916
917 // status bar was filled by snapHelper
918 }
919
920 static void showStatusInfo(double angle, double hdg, double distance, boolean activeFlag) {
921 MapFrame map = MainApplication.getMap();
922 map.statusLine.setAngle(angle);
923 map.statusLine.activateAnglePanel(activeFlag);
924 map.statusLine.setHeading(hdg);
925 map.statusLine.setDist(distance);
926 }
927
928 /**
929 * Helper function that sets fields currentBaseNode and previousNode
930 * @param selection
931 * uses also lastUsedNode field
932 */
933 private synchronized void determineCurrentBaseNodeAndPreviousNode(Collection<OsmPrimitive> selection) {
934 Node selectedNode = null;
935 Way selectedWay = null;
936 for (OsmPrimitive p : selection) {
937 if (p instanceof Node) {
938 if (selectedNode != null)
939 return;
940 selectedNode = (Node) p;
941 } else if (p instanceof Way) {
942 if (selectedWay != null)
943 return;
944 selectedWay = (Way) p;
945 }
946 }
947 // we are here, if not more than 1 way or node is selected,
948
949 // the node from which we make a connection
950 currentBaseNode = null;
951 previousNode = null;
952
953 // Try to find an open way to measure angle from it. The way is not to be continued!
954 // warning: may result in changes of currentBaseNode and previousNode
955 // please remove if bugs arise
956 if (selectedWay == null && selectedNode != null) {
957 for (OsmPrimitive p: selectedNode.getReferrers()) {
958 if (p.isUsable() && p instanceof Way && ((Way) p).isFirstLastNode(selectedNode)) {
959 if (selectedWay != null) { // two uncontinued ways, nothing to take as reference
960 selectedWay = null;
961 break;
962 } else {
963 // set us ~continue this way (measure angle from it)
964 selectedWay = (Way) p;
965 }
966 }
967 }
968 }
969
970 if (selectedNode == null) {
971 if (selectedWay == null)
972 return;
973 continueWayFromNode(selectedWay, lastUsedNode);
974 } else if (selectedWay == null) {
975 currentBaseNode = selectedNode;
976 } else if (!selectedWay.isDeleted()) { // fix #7118
977 continueWayFromNode(selectedWay, selectedNode);
978 }
979 }
980
981 /**
982 * if one of the ends of {@code way} is given {@code node},
983 * then set currentBaseNode = node and previousNode = adjacent node of way
984 * @param way way to continue
985 * @param node starting node
986 */
987 private void continueWayFromNode(Way way, Node node) {
988 int n = way.getNodesCount();
989 if (node == way.firstNode()) {
990 currentBaseNode = node;
991 if (n > 1) previousNode = way.getNode(1);
992 } else if (node == way.lastNode()) {
993 currentBaseNode = node;
994 if (n > 1) previousNode = way.getNode(n-2);
995 }
996 }
997
998 /**
999 * Repaint on mouse exit so that the helper line goes away.
1000 */
1001 @Override
1002 public void mouseExited(MouseEvent e) {
1003 OsmDataLayer editLayer = MainApplication.getLayerManager().getEditLayer();
1004 if (editLayer == null)
1005 return;
1006 mousePos = e.getPoint();
1007 snapHelper.noSnapNow();
1008 boolean repaintIssued = removeHighlighting(e);
1009 // force repaint in case snapHelper needs one. If removeHighlighting
1010 // caused one already, don't do it again.
1011 if (!repaintIssued) {
1012 editLayer.invalidate();
1013 }
1014 }
1015
1016 /**
1017 * Replies the parent way of a node, if it is the end of exactly one usable way.
1018 * @param n node
1019 * @return If the node is the end of exactly one way, return this.
1020 * <code>null</code> otherwise.
1021 */
1022 public static Way getWayForNode(Node n) {
1023 Way way = null;
1024 for (Way w : Utils.filteredCollection(n.getReferrers(), Way.class)) {
1025 if (!w.isUsable() || w.getNodesCount() < 1) {
1026 continue;
1027 }
1028 Node firstNode = w.getNode(0);
1029 Node lastNode = w.getNode(w.getNodesCount() - 1);
1030 if ((firstNode == n || lastNode == n) && (firstNode != lastNode)) {
1031 if (way != null)
1032 return null;
1033 way = w;
1034 }
1035 }
1036 return way;
1037 }
1038
1039 /**
1040 * Replies the current base node, after having checked it is still usable (see #11105).
1041 * @return the current base node (can be null). If not-null, it's guaranteed the node is usable
1042 */
1043 public synchronized Node getCurrentBaseNode() {
1044 if (currentBaseNode != null && (currentBaseNode.getDataSet() == null || !currentBaseNode.isUsable())) {
1045 currentBaseNode = null;
1046 }
1047 return currentBaseNode;
1048 }
1049
1050 private static void pruneSuccsAndReverse(List<Integer> is) {
1051 Set<Integer> is2 = new HashSet<>();
1052 for (int i : is) {
1053 if (!is2.contains(i - 1) && !is2.contains(i + 1)) {
1054 is2.add(i);
1055 }
1056 }
1057 is.clear();
1058 is.addAll(is2);
1059 Collections.sort(is);
1060 Collections.reverse(is);
1061 }
1062
1063 /**
1064 * Adjusts the position of a node to lie on a segment (or a segment intersection).
1065 *
1066 * If one or more than two segments are passed, the node is adjusted
1067 * to lie on the first segment that is passed.
1068 *
1069 * If two segments are passed, the node is adjusted to be at their intersection.
1070 *
1071 * No action is taken if no segments are passed.
1072 *
1073 * @param segs the segments to use as a reference when adjusting
1074 * @param n the node to adjust
1075 */
1076 private static void adjustNode(Collection<Pair<Node, Node>> segs, Node n) {
1077 switch (segs.size()) {
1078 case 0:
1079 return;
1080 case 2:
1081 adjustNodeTwoSegments(segs, n);
1082 break;
1083 default:
1084 adjustNodeDefault(segs, n);
1085 }
1086 }
1087
1088 private static void adjustNodeTwoSegments(Collection<Pair<Node, Node>> segs, Node n) {
1089 // This computes the intersection between the two segments and adjusts the node position.
1090 Iterator<Pair<Node, Node>> i = segs.iterator();
1091 Pair<Node, Node> seg = i.next();
1092 EastNorth pA = seg.a.getEastNorth();
1093 EastNorth pB = seg.b.getEastNorth();
1094 seg = i.next();
1095 EastNorth pC = seg.a.getEastNorth();
1096 EastNorth pD = seg.b.getEastNorth();
1097
1098 double u = det(pB.east() - pA.east(), pB.north() - pA.north(), pC.east() - pD.east(), pC.north() - pD.north());
1099
1100 // Check for parallel segments and do nothing if they are
1101 // In practice this will probably only happen when a way has been duplicated
1102
1103 if (u == 0)
1104 return;
1105
1106 // q is a number between 0 and 1
1107 // It is the point in the segment where the intersection occurs
1108 // if the segment is scaled to length 1
1109
1110 double q = det(pB.north() - pC.north(), pB.east() - pC.east(), pD.north() - pC.north(), pD.east() - pC.east()) / u;
1111 EastNorth intersection = new EastNorth(
1112 pB.east() + q * (pA.east() - pB.east()),
1113 pB.north() + q * (pA.north() - pB.north()));
1114
1115
1116 // only adjust to intersection if within snapToIntersectionThreshold pixel of mouse click; otherwise
1117 // fall through to default action.
1118 // (for semi-parallel lines, intersection might be miles away!)
1119 MapFrame map = MainApplication.getMap();
1120 if (map.mapView.getPoint2D(n).distance(map.mapView.getPoint2D(intersection)) < SNAP_TO_INTERSECTION_THRESHOLD.get()) {
1121 n.setEastNorth(intersection);
1122 return;
1123 }
1124
1125 adjustNodeDefault(segs, n);
1126 }
1127
1128 private static void adjustNodeDefault(Collection<Pair<Node, Node>> segs, Node n) {
1129 EastNorth p = n.getEastNorth();
1130 Pair<Node, Node> seg = segs.iterator().next();
1131 EastNorth pA = seg.a.getEastNorth();
1132 EastNorth pB = seg.b.getEastNorth();
1133 double a = p.distanceSq(pB);
1134 double b = p.distanceSq(pA);
1135 double c = pA.distanceSq(pB);
1136 double q = (a - b + c) / (2*c);
1137 n.setEastNorth(new EastNorth(pB.east() + q * (pA.east() - pB.east()), pB.north() + q * (pA.north() - pB.north())));
1138 }
1139
1140 // helper for adjustNode
1141 static double det(double a, double b, double c, double d) {
1142 return a * d - b * c;
1143 }
1144
1145 private void tryToMoveNodeOnIntersection(List<WaySegment> wss, Node n) {
1146 if (wss.isEmpty())
1147 return;
1148 WaySegment ws = wss.get(0);
1149 EastNorth p1 = ws.getFirstNode().getEastNorth();
1150 EastNorth p2 = ws.getSecondNode().getEastNorth();
1151 if (snapHelper.dir2 != null && getCurrentBaseNode() != null) {
1152 EastNorth xPoint = Geometry.getSegmentSegmentIntersection(p1, p2, snapHelper.dir2,
1153 getCurrentBaseNode().getEastNorth());
1154 if (xPoint != null) {
1155 n.setEastNorth(xPoint);
1156 }
1157 }
1158 }
1159
1160 /**
1161 * Takes the data from computeHelperLine to determine which ways/nodes should be highlighted
1162 * (if feature enabled). Also sets the target cursor if appropriate. It adds the to-be-
1163 * highlighted primitives to newHighlights but does not actually highlight them. This work is
1164 * done in redrawIfRequired. This means, calling addHighlighting() without redrawIfRequired()
1165 * will leave the data in an inconsistent state.
1166 *
1167 * The status bar derives its information from oldHighlights, so in order to update the status
1168 * bar both addHighlighting() and repaintIfRequired() are needed, since former fills newHighlights
1169 * and latter processes them into oldHighlights.
1170 * @param event event, can be null
1171 */
1172 private void addHighlighting(Object event) {
1173 newHighlights = new HashSet<>();
1174 MapView mapView = MainApplication.getMap().mapView;
1175
1176 // if ctrl key is held ("no join"), don't highlight anything
1177 if (ctrl) {
1178 mapView.setNewCursor(cursor, this);
1179 redrawIfRequired(event);
1180 return;
1181 }
1182
1183 // This happens when nothing is selected, but we still want to highlight the "target node"
1184 DataSet ds = getLayerManager().getEditDataSet();
1185 if (mouseOnExistingNode == null && mousePos != null && ds != null && ds.selectionEmpty()) {
1186 mouseOnExistingNode = mapView.getNearestNode(mousePos, OsmPrimitive::isSelectable);
1187 }
1188
1189 if (mouseOnExistingNode != null) {
1190 mapView.setNewCursor(cursorJoinNode, this);
1191 newHighlights.add(mouseOnExistingNode);
1192 redrawIfRequired(event);
1193 return;
1194 }
1195
1196 // Insert the node into all the nearby way segments
1197 if (mouseOnExistingWays.isEmpty()) {
1198 mapView.setNewCursor(cursor, this);
1199 redrawIfRequired(event);
1200 return;
1201 }
1202
1203 mapView.setNewCursor(cursorJoinWay, this);
1204 newHighlights.addAll(mouseOnExistingWays);
1205 redrawIfRequired(event);
1206 }
1207
1208 /**
1209 * Removes target highlighting from primitives. Issues repaint if required.
1210 * @param event event, can be null
1211 * @return true if a repaint has been issued.
1212 */
1213 private boolean removeHighlighting(Object event) {
1214 newHighlights = new HashSet<>();
1215 return redrawIfRequired(event);
1216 }
1217
1218 @Override
1219 public synchronized void paint(Graphics2D g, MapView mv, Bounds box) {
1220 // sanity checks
1221 MapView mapView = MainApplication.getMap().mapView;
1222 if (mapView == null || mousePos == null
1223 // don't draw line if we don't know where from or where to
1224 || currentMouseEastNorth == null || getCurrentBaseNode() == null
1225 // don't draw line if mouse is outside window
1226 || !mapView.getState().getForView(mousePos.getX(), mousePos.getY()).isInView())
1227 return;
1228
1229 Graphics2D g2 = g;
1230 snapHelper.drawIfNeeded(g2, mv.getState());
1231 if (!DRAW_HELPER_LINE.get() || wayIsFinished || shift)
1232 return;
1233
1234 if (!snapHelper.isActive()) {
1235 g2.setColor(RUBBER_LINE_COLOR.get());
1236 g2.setStroke(RUBBER_LINE_STROKE.get());
1237 paintConstructionGeometry(mv, g2);
1238 } else if (DRAW_CONSTRUCTION_GEOMETRY.get()) {
1239 // else use color and stoke from snapHelper.draw
1240 paintConstructionGeometry(mv, g2);
1241 }
1242 }
1243
1244 private void paintConstructionGeometry(MapView mv, Graphics2D g2) {
1245 MapPath2D b = new MapPath2D();
1246 MapViewPoint p1 = mv.getState().getPointFor(getCurrentBaseNode());
1247 MapViewPoint p2 = mv.getState().getPointFor(currentMouseEastNorth);
1248
1249 b.moveTo(p1);
1250 b.lineTo(p2);
1251
1252 // if alt key is held ("start new way"), draw a little perpendicular line
1253 if (alt) {
1254 START_WAY_INDICATOR.paintArrowAt(b, p1, p2);
1255 }
1256
1257 g2.draw(b);
1258 g2.setStroke(BASIC_STROKE);
1259 }
1260
1261 @Override
1262 public String getModeHelpText() {
1263 StringBuilder rv;
1264 /*
1265 * No modifiers: all (Connect, Node Re-Use, Auto-Weld)
1266 * CTRL: disables node re-use, auto-weld
1267 * Shift: do not make connection
1268 * ALT: make connection but start new way in doing so
1269 */
1270
1271 /*
1272 * Status line text generation is split into two parts to keep it maintainable.
1273 * First part looks at what will happen to the new node inserted on click and
1274 * the second part will look if a connection is made or not.
1275 *
1276 * Note that this help text is not absolutely accurate as it doesn't catch any special
1277 * cases (e.g. when preventing <---> ways). The only special that it catches is when
1278 * a way is about to be finished.
1279 *
1280 * First check what happens to the new node.
1281 */
1282
1283 // oldHighlights stores the current highlights. If this
1284 // list is empty we can assume that we won't do any joins
1285 if (ctrl || oldHighlights.isEmpty()) {
1286 rv = new StringBuilder(tr("Create new node."));
1287 } else {
1288 // oldHighlights may store a node or way, check if it's a node
1289 OsmPrimitive x = oldHighlights.iterator().next();
1290 if (x instanceof Node) {
1291 rv = new StringBuilder(tr("Select node under cursor."));
1292 } else {
1293 rv = new StringBuilder(trn("Insert new node into way.", "Insert new node into {0} ways.",
1294 oldHighlights.size(), oldHighlights.size()));
1295 }
1296 }
1297
1298 /*
1299 * Check whether a connection will be made
1300 */
1301 if (!wayIsFinished && getCurrentBaseNode() != null) {
1302 if (alt) {
1303 rv.append(' ').append(tr("Start new way from last node."));
1304 } else {
1305 rv.append(' ').append(tr("Continue way from last node."));
1306 }
1307 if (snapHelper.isSnapOn()) {
1308 rv.append(' ').append(tr("Angle snapping active."));
1309 }
1310 }
1311
1312 Node n = mouseOnExistingNode;
1313 DataSet ds = getLayerManager().getEditDataSet();
1314 /*
1315 * Handle special case: Highlighted node == selected node => finish drawing
1316 */
1317 if (n != null && ds != null && ds.getSelectedNodes().contains(n)) {
1318 if (wayIsFinished) {
1319 rv = new StringBuilder(tr("Select node under cursor."));
1320 } else {
1321 rv = new StringBuilder(tr("Finish drawing."));
1322 }
1323 }
1324
1325 /*
1326 * Handle special case: Self-Overlapping or closing way
1327 */
1328 if (ds != null && !ds.getSelectedWays().isEmpty() && !wayIsFinished && !alt) {
1329 Way w = ds.getSelectedWays().iterator().next();
1330 for (Node m : w.getNodes()) {
1331 if (m.equals(mouseOnExistingNode) || mouseOnExistingWays.contains(w)) {
1332 rv.append(' ').append(tr("Finish drawing."));
1333 break;
1334 }
1335 }
1336 }
1337 return rv.toString();
1338 }
1339
1340 /**
1341 * Get selected primitives, while draw action is in progress.
1342 *
1343 * While drawing a way, technically the last node is selected.
1344 * This is inconvenient when the user tries to add/edit tags to the way.
1345 * For this case, this method returns the current way as selection,
1346 * to work around this issue.
1347 * Otherwise the normal selection of the current data layer is returned.
1348 * @return selected primitives, while draw action is in progress
1349 */
1350 public Collection<OsmPrimitive> getInProgressSelection() {
1351 DataSet ds = getLayerManager().getEditDataSet();
1352 if (ds == null) return Collections.emptyList();
1353 if (getCurrentBaseNode() != null && !ds.selectionEmpty()) {
1354 Way continueFrom = getWayForNode(getCurrentBaseNode());
1355 if (continueFrom != null)
1356 return Collections.<OsmPrimitive>singleton(continueFrom);
1357 }
1358 return ds.getSelected();
1359 }
1360
1361 @Override
1362 public boolean layerIsSupported(Layer l) {
1363 return isEditableDataLayer(l);
1364 }
1365
1366 @Override
1367 protected void updateEnabledState() {
1368 setEnabled(getLayerManager().getEditLayer() != null);
1369 }
1370
1371 @Override
1372 public void destroy() {
1373 super.destroy();
1374 snapChangeAction.destroy();
1375 }
1376
1377 /**
1378 * Undo the last command. Binded by default to backspace key.
1379 */
1380 public class BackSpaceAction extends AbstractAction {
1381
1382 @Override
1383 public void actionPerformed(ActionEvent e) {
1384 MainApplication.undoRedo.undo();
1385 Command lastCmd = MainApplication.undoRedo.getLastCommand();
1386 if (lastCmd == null) return;
1387 Node n = null;
1388 for (OsmPrimitive p: lastCmd.getParticipatingPrimitives()) {
1389 if (p instanceof Node) {
1390 if (n == null) {
1391 n = (Node) p; // found one node
1392 wayIsFinished = false;
1393 } else {
1394 // if more than 1 node were affected by previous command,
1395 // we have no way to continue, so we forget about found node
1396 n = null;
1397 break;
1398 }
1399 }
1400 }
1401 // select last added node - maybe we will continue drawing from it
1402 if (n != null) {
1403 addSelection(getLayerManager().getEditDataSet(), n);
1404 }
1405 }
1406 }
1407
1408 private class SnapChangeAction extends JosmAction {
1409 /**
1410 * Constructs a new {@code SnapChangeAction}.
1411 */
1412 SnapChangeAction() {
1413 super(tr("Angle snapping"), /* ICON() */ "anglesnap",
1414 tr("Switch angle snapping mode while drawing"), null, false);
1415 putValue("help", ht("/Action/Draw/AngleSnap"));
1416 }
1417
1418 @Override
1419 public void actionPerformed(ActionEvent e) {
1420 if (snapHelper != null) {
1421 snapHelper.toggleSnapping();
1422 }
1423 }
1424
1425 @Override
1426 protected void updateEnabledState() {
1427 MapFrame map = MainApplication.getMap();
1428 setEnabled(map != null && map.mapMode instanceof DrawAction);
1429 }
1430 }
1431}
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