source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/ExtrudeAction.java@ 8465

Last change on this file since 8465 was 8465, checked in by Don-vip, 9 years ago

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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;
7
8import java.awt.BasicStroke;
9import java.awt.Color;
10import java.awt.Cursor;
11import java.awt.Graphics2D;
12import java.awt.Point;
13import java.awt.Rectangle;
14import java.awt.Stroke;
15import java.awt.event.ActionEvent;
16import java.awt.event.KeyEvent;
17import java.awt.event.MouseEvent;
18import java.awt.geom.AffineTransform;
19import java.awt.geom.GeneralPath;
20import java.awt.geom.Line2D;
21import java.awt.geom.NoninvertibleTransformException;
22import java.awt.geom.Point2D;
23import java.util.ArrayList;
24import java.util.Collection;
25import java.util.LinkedList;
26import java.util.List;
27
28import javax.swing.JCheckBoxMenuItem;
29import javax.swing.JMenuItem;
30
31import org.openstreetmap.josm.Main;
32import org.openstreetmap.josm.actions.JosmAction;
33import org.openstreetmap.josm.actions.MergeNodesAction;
34import org.openstreetmap.josm.command.AddCommand;
35import org.openstreetmap.josm.command.ChangeCommand;
36import org.openstreetmap.josm.command.Command;
37import org.openstreetmap.josm.command.MoveCommand;
38import org.openstreetmap.josm.command.SequenceCommand;
39import org.openstreetmap.josm.data.Bounds;
40import org.openstreetmap.josm.data.coor.EastNorth;
41import org.openstreetmap.josm.data.osm.Node;
42import org.openstreetmap.josm.data.osm.OsmPrimitive;
43import org.openstreetmap.josm.data.osm.Way;
44import org.openstreetmap.josm.data.osm.WaySegment;
45import org.openstreetmap.josm.data.osm.visitor.paint.PaintColors;
46import org.openstreetmap.josm.gui.MainMenu;
47import org.openstreetmap.josm.gui.MapFrame;
48import org.openstreetmap.josm.gui.MapView;
49import org.openstreetmap.josm.gui.layer.Layer;
50import org.openstreetmap.josm.gui.layer.MapViewPaintable;
51import org.openstreetmap.josm.gui.layer.OsmDataLayer;
52import org.openstreetmap.josm.gui.util.GuiHelper;
53import org.openstreetmap.josm.gui.util.KeyPressReleaseListener;
54import org.openstreetmap.josm.gui.util.ModifierListener;
55import org.openstreetmap.josm.tools.Geometry;
56import org.openstreetmap.josm.tools.ImageProvider;
57import org.openstreetmap.josm.tools.Shortcut;
58
59/**
60 * Makes a rectangle from a line, or modifies a rectangle.
61 */
62public class ExtrudeAction extends MapMode implements MapViewPaintable, KeyPressReleaseListener, ModifierListener {
63
64 enum Mode { extrude, translate, select, create_new, translate_node }
65
66 private Mode mode = Mode.select;
67
68 /**
69 * If {@code true}, when extruding create new node(s) even if segments are parallel.
70 */
71 private boolean alwaysCreateNodes = false;
72 private boolean nodeDragWithoutCtrl;
73
74 private long mouseDownTime = 0;
75 private transient WaySegment selectedSegment = null;
76 private transient Node selectedNode = null;
77 private Color mainColor;
78 private transient Stroke mainStroke;
79
80 /** settings value whether shared nodes should be ignored or not */
81 private boolean ignoreSharedNodes;
82
83 private boolean keepSegmentDirection;
84
85 /**
86 * drawing settings for helper lines
87 */
88 private Color helperColor;
89 private transient Stroke helperStrokeDash;
90 private transient Stroke helperStrokeRA;
91
92 private transient Stroke oldLineStroke;
93 private double symbolSize;
94 /**
95 * Possible directions to move to.
96 */
97 private transient List<ReferenceSegment> possibleMoveDirections;
98
99
100 /**
101 * Collection of nodes that is moved
102 */
103 private List<Node> movingNodeList;
104
105 /**
106 * The direction that is currently active.
107 */
108 private transient ReferenceSegment activeMoveDirection;
109
110 /**
111 * The position of the mouse cursor when the drag action was initiated.
112 */
113 private Point initialMousePos;
114 /**
115 * The time which needs to pass between click and release before something
116 * counts as a move, in milliseconds
117 */
118 private int initialMoveDelay = 200;
119 /**
120 * The minimal shift of mouse (in pixels) befire something counts as move
121 */
122 private int initialMoveThreshold = 1;
123
124 /**
125 * The initial EastNorths of node1 and node2
126 */
127 private EastNorth initialN1en;
128 private EastNorth initialN2en;
129 /**
130 * The new EastNorths of node1 and node2
131 */
132 private EastNorth newN1en;
133 private EastNorth newN2en;
134
135 /**
136 * the command that performed last move.
137 */
138 private transient MoveCommand moveCommand;
139 /**
140 * The command used for dual alignment movement.
141 * Needs to be separate, due to two nodes moving in different directions.
142 */
143 private transient MoveCommand moveCommand2;
144
145 /** The cursor for the 'create_new' mode. */
146 private final Cursor cursorCreateNew;
147
148 /** The cursor for the 'translate' mode. */
149 private final Cursor cursorTranslate;
150
151 /** The cursor for the 'alwaysCreateNodes' submode. */
152 private final Cursor cursorCreateNodes;
153
154 private static class ReferenceSegment {
155 public final EastNorth en;
156 public final EastNorth p1;
157 public final EastNorth p2;
158 public final boolean perpendicular;
159
160 public ReferenceSegment(EastNorth en, EastNorth p1, EastNorth p2, boolean perpendicular) {
161 this.en = en;
162 this.p1 = p1;
163 this.p2 = p2;
164 this.perpendicular = perpendicular;
165 }
166
167 @Override
168 public String toString() {
169 return "ReferenceSegment[en=" + en + ", p1=" + p1 + ", p2=" + p2 + ", perp=" + perpendicular + "]";
170 }
171 }
172
173 // Dual alignment mode stuff
174 /** {@code true}, if dual alignment mode is enabled. User wants following extrude to be dual aligned. */
175 private boolean dualAlignEnabled;
176 /** {@code true}, if dual alignment is active. User is dragging the mouse, required conditions are met. Treat {@link #mode} (extrude/translate/create_new) as dual aligned. */
177 private boolean dualAlignActive;
178 /** Dual alignment reference segments */
179 private transient ReferenceSegment dualAlignSegment1, dualAlignSegment2;
180 /** {@code true}, if new segment was collapsed */
181 private boolean dualAlignSegmentCollapsed = false;
182 // Dual alignment UI stuff
183 private final DualAlignChangeAction dualAlignChangeAction;
184 private final JCheckBoxMenuItem dualAlignCheckboxMenuItem;
185 private final transient Shortcut dualAlignShortcut;
186 private boolean useRepeatedShortcut;
187 private boolean ignoreNextKeyRelease;
188
189 private class DualAlignChangeAction extends JosmAction {
190 public DualAlignChangeAction() {
191 super(tr("Dual alignment"), /* ICON() */ "mapmode/extrude/dualalign",
192 tr("Switch dual alignment mode while extruding"), null, false);
193 putValue("help", ht("/Action/Extrude#DualAlign"));
194 }
195
196 @Override
197 public void actionPerformed(ActionEvent e) {
198 toggleDualAlign();
199 }
200 }
201
202 /**
203 * Creates a new ExtrudeAction
204 * @param mapFrame The MapFrame this action belongs to.
205 */
206 public ExtrudeAction(MapFrame mapFrame) {
207 super(tr("Extrude"), /* ICON(mapmode/) */ "extrude/extrude", tr("Create areas"),
208 Shortcut.registerShortcut("mapmode:extrude", tr("Mode: {0}", tr("Extrude")), KeyEvent.VK_X, Shortcut.DIRECT),
209 mapFrame,
210 ImageProvider.getCursor("normal", "rectangle"));
211 putValue("help", ht("/Action/Extrude"));
212 cursorCreateNew = ImageProvider.getCursor("normal", "rectangle_plus");
213 cursorTranslate = ImageProvider.getCursor("normal", "rectangle_move");
214 cursorCreateNodes = ImageProvider.getCursor("normal", "rectangle_plussmall");
215
216 dualAlignEnabled = false;
217 dualAlignChangeAction = new DualAlignChangeAction();
218 dualAlignCheckboxMenuItem = addDualAlignMenuItem();
219 dualAlignCheckboxMenuItem.getAction().setEnabled(false);
220 dualAlignCheckboxMenuItem.setState(dualAlignEnabled);
221 dualAlignShortcut = Shortcut.registerShortcut("mapmode:extrudedualalign",
222 tr("Mode: {0}", tr("Extrude Dual alignment")), KeyEvent.CHAR_UNDEFINED, Shortcut.NONE);
223 readPreferences(); // to show prefernces in table before entering the mode
224 }
225
226 @Override
227 public void destroy() {
228 super.destroy();
229 dualAlignChangeAction.destroy();
230 }
231
232 private JCheckBoxMenuItem addDualAlignMenuItem() {
233 int n = Main.main.menu.editMenu.getItemCount();
234 for (int i = n-1; i>0; i--) {
235 JMenuItem item = Main.main.menu.editMenu.getItem(i);
236 if (item != null && item.getAction() != null && item.getAction() instanceof DualAlignChangeAction) {
237 Main.main.menu.editMenu.remove(i);
238 }
239 }
240 return MainMenu.addWithCheckbox(Main.main.menu.editMenu, dualAlignChangeAction, MainMenu.WINDOW_MENU_GROUP.VOLATILE);
241 }
242
243 // -------------------------------------------------------------------------
244 // Mode methods
245 // -------------------------------------------------------------------------
246
247 @Override
248 public String getModeHelpText() {
249 StringBuilder rv;
250 if (mode == Mode.select) {
251 rv = new StringBuilder(tr("Drag a way segment to make a rectangle. Ctrl-drag to move a segment along its normal, " +
252 "Alt-drag to create a new rectangle, double click to add a new node."));
253 if (dualAlignEnabled) {
254 rv.append(' ').append(tr("Dual alignment active."));
255 if (dualAlignSegmentCollapsed)
256 rv.append(' ').append(tr("Segment collapsed due to its direction reversing."));
257 }
258 } else {
259 if (mode == Mode.translate)
260 rv = new StringBuilder(tr("Move a segment along its normal, then release the mouse button."));
261 else if (mode == Mode.translate_node)
262 rv = new StringBuilder(tr("Move the node along one of the segments, then release the mouse button."));
263 else if (mode == Mode.extrude)
264 rv = new StringBuilder(tr("Draw a rectangle of the desired size, then release the mouse button."));
265 else if (mode == Mode.create_new)
266 rv = new StringBuilder(tr("Draw a rectangle of the desired size, then release the mouse button."));
267 else {
268 Main.warn("Extrude: unknown mode " + mode);
269 rv = new StringBuilder();
270 }
271 if (dualAlignActive) {
272 rv.append(' ').append(tr("Dual alignment active."));
273 if (dualAlignSegmentCollapsed) {
274 rv.append(' ').append(tr("Segment collapsed due to its direction reversing."));
275 }
276 }
277 }
278 return rv.toString();
279 }
280
281 @Override
282 public boolean layerIsSupported(Layer l) {
283 return l instanceof OsmDataLayer;
284 }
285
286 @Override
287 public void enterMode() {
288 super.enterMode();
289 Main.map.mapView.addMouseListener(this);
290 Main.map.mapView.addMouseMotionListener(this);
291 readPreferences();
292 ignoreNextKeyRelease = true;
293 Main.map.keyDetector.addKeyListener(this);
294 Main.map.keyDetector.addModifierListener(this);
295 }
296
297 private void readPreferences() {
298 initialMoveDelay = Main.pref.getInteger("edit.initial-move-delay",200);
299 initialMoveThreshold = Main.pref.getInteger("extrude.initial-move-threshold", 1);
300 mainColor = Main.pref.getColor(marktr("Extrude: main line"), null);
301 if (mainColor == null) mainColor = PaintColors.SELECTED.get();
302 helperColor = Main.pref.getColor(marktr("Extrude: helper line"), Color.ORANGE);
303 helperStrokeDash = GuiHelper.getCustomizedStroke(Main.pref.get("extrude.stroke.helper-line", "1 4"));
304 helperStrokeRA = new BasicStroke(1);
305 symbolSize = Main.pref.getDouble("extrude.angle-symbol-radius", 8);
306 nodeDragWithoutCtrl = Main.pref.getBoolean("extrude.drag-nodes-without-ctrl", false);
307 oldLineStroke = GuiHelper.getCustomizedStroke(Main.pref.get("extrude.ctrl.stroke.old-line", "1"));
308 mainStroke = GuiHelper.getCustomizedStroke(Main.pref.get("extrude.stroke.main", "3"));
309
310 ignoreSharedNodes = Main.pref.getBoolean("extrude.ignore-shared-nodes", true);
311 dualAlignCheckboxMenuItem.getAction().setEnabled(true);
312 useRepeatedShortcut = Main.pref.getBoolean("extrude.dualalign.toggleOnRepeatedX", true);
313 keepSegmentDirection = Main.pref.getBoolean("extrude.dualalign.keep-segment-direction", true);
314 }
315
316 @Override
317 public void exitMode() {
318 Main.map.mapView.removeMouseListener(this);
319 Main.map.mapView.removeMouseMotionListener(this);
320 Main.map.mapView.removeTemporaryLayer(this);
321 dualAlignCheckboxMenuItem.getAction().setEnabled(false);
322 Main.map.keyDetector.removeKeyListener(this);
323 Main.map.keyDetector.removeModifierListener(this);
324 super.exitMode();
325 }
326
327 // -------------------------------------------------------------------------
328 // Event handlers
329 // -------------------------------------------------------------------------
330
331 /**
332 * This method is called to indicate different modes via cursor when the Alt/Ctrl/Shift modifier is pressed,
333 */
334 @Override
335 public void modifiersChanged(int modifiers) {
336 if (!Main.isDisplayingMapView() || !Main.map.mapView.isActiveLayerDrawable())
337 return;
338 updateKeyModifiers(modifiers);
339 if (mode == Mode.select) {
340 Main.map.mapView.setNewCursor(ctrl ? cursorTranslate : alt ? cursorCreateNew : shift ? cursorCreateNodes : cursor, this);
341 }
342 }
343
344 @Override
345 public void doKeyPressed(KeyEvent e) {
346 }
347
348 @Override
349 public void doKeyReleased(KeyEvent e) {
350 if (!dualAlignShortcut.isEvent(e) && !(useRepeatedShortcut && getShortcut().isEvent(e)))
351 return;
352 if (ignoreNextKeyRelease) {
353 ignoreNextKeyRelease = false;
354 } else {
355 toggleDualAlign();
356 }
357 }
358 /**
359 * Toggles dual alignment mode.
360 */
361 private void toggleDualAlign() {
362 dualAlignEnabled = !dualAlignEnabled;
363 dualAlignCheckboxMenuItem.setState(dualAlignEnabled);
364 updateStatusLine();
365 }
366
367 /**
368 * If the left mouse button is pressed over a segment or a node, switches
369 * to appropriate {@link #mode}, depending on Ctrl/Alt/Shift modifiers and
370 * {@link #dualAlignEnabled}.
371 * @param e
372 */
373 @Override
374 public void mousePressed(MouseEvent e) {
375 if(!Main.map.mapView.isActiveLayerVisible())
376 return;
377 if (!(Boolean)this.getValue("active"))
378 return;
379 if (e.getButton() != MouseEvent.BUTTON1)
380 return;
381
382 requestFocusInMapView();
383 updateKeyModifiers(e);
384
385 selectedNode = Main.map.mapView.getNearestNode(e.getPoint(), OsmPrimitive.isSelectablePredicate);
386 selectedSegment = Main.map.mapView.getNearestWaySegment(e.getPoint(), OsmPrimitive.isSelectablePredicate);
387
388 // If nothing gets caught, stay in select mode
389 if (selectedSegment == null && selectedNode == null) return;
390
391 if (selectedNode != null) {
392 if (ctrl || nodeDragWithoutCtrl) {
393 movingNodeList = new ArrayList<>();
394 movingNodeList.add(selectedNode);
395 calculatePossibleDirectionsByNode();
396 if (possibleMoveDirections.isEmpty()) {
397 // if no directions fould, do not enter dragging mode
398 return;
399 }
400 mode = Mode.translate_node;
401 dualAlignActive = false;
402 }
403 } else {
404 // Otherwise switch to another mode
405 if (dualAlignEnabled && checkDualAlignConditions()) {
406 dualAlignActive = true;
407 calculatePossibleDirectionsForDualAlign();
408 dualAlignSegmentCollapsed = false;
409 } else {
410 dualAlignActive = false;
411 calculatePossibleDirectionsBySegment();
412 }
413 if (ctrl) {
414 mode = Mode.translate;
415 movingNodeList = new ArrayList<>();
416 movingNodeList.add(selectedSegment.getFirstNode());
417 movingNodeList.add(selectedSegment.getSecondNode());
418 } else if (alt) {
419 mode = Mode.create_new;
420 // create a new segment and then select and extrude the new segment
421 getCurrentDataSet().setSelected(selectedSegment.way);
422 alwaysCreateNodes = true;
423 } else {
424 mode = Mode.extrude;
425 getCurrentDataSet().setSelected(selectedSegment.way);
426 alwaysCreateNodes = shift;
427 }
428 }
429
430 // Signifies that nothing has happened yet
431 newN1en = null;
432 newN2en = null;
433 moveCommand = null;
434 moveCommand2 = null;
435
436 Main.map.mapView.addTemporaryLayer(this);
437
438 updateStatusLine();
439 Main.map.mapView.repaint();
440
441 // Make note of time pressed
442 mouseDownTime = System.currentTimeMillis();
443
444 // Make note of mouse position
445 initialMousePos = e.getPoint();
446 }
447
448 /**
449 * Performs action depending on what {@link #mode} we're in.
450 * @param e
451 */
452 @Override
453 public void mouseDragged(MouseEvent e) {
454 if(!Main.map.mapView.isActiveLayerVisible())
455 return;
456
457 // do not count anything as a drag if it lasts less than 100 milliseconds.
458 if (System.currentTimeMillis() - mouseDownTime < initialMoveDelay)
459 return;
460
461 if (mode == Mode.select) {
462 // Just sit tight and wait for mouse to be released.
463 } else {
464 //move, create new and extrude mode - move the selected segment
465
466 EastNorth mouseEn = Main.map.mapView.getEastNorth(e.getPoint().x, e.getPoint().y);
467 EastNorth bestMovement = calculateBestMovementAndNewNodes(mouseEn);
468
469 Main.map.mapView.setNewCursor(Cursor.MOVE_CURSOR, this);
470
471 if (dualAlignActive) {
472 if (mode == Mode.extrude || mode == Mode.create_new) {
473 // nothing here
474 } else if (mode == Mode.translate) {
475 EastNorth movement1 = initialN1en.sub(newN1en);
476 EastNorth movement2 = initialN2en.sub(newN2en);
477 // move nodes to new position
478 if (moveCommand == null || moveCommand2 == null) {
479 // make a new move commands
480 moveCommand = new MoveCommand(movingNodeList.get(0), movement1.getX(), movement1.getY());
481 moveCommand2 = new MoveCommand(movingNodeList.get(1), movement2.getX(), movement2.getY());
482 Command c = new SequenceCommand(tr("Extrude Way"), moveCommand, moveCommand2);
483 Main.main.undoRedo.add(c);
484 } else {
485 // reuse existing move commands
486 moveCommand.moveAgainTo(movement1.getX(), movement1.getY());
487 moveCommand2.moveAgainTo(movement2.getX(), movement2.getY());
488 }
489 }
490 } else {
491 if (mode == Mode.extrude || mode == Mode.create_new) {
492 //nothing here
493 } else if (mode == Mode.translate_node || mode == Mode.translate) {
494 //move nodes to new position
495 if (moveCommand == null) {
496 //make a new move command
497 moveCommand = new MoveCommand(new ArrayList<OsmPrimitive>(movingNodeList), bestMovement);
498 Main.main.undoRedo.add(moveCommand);
499 } else {
500 //reuse existing move command
501 moveCommand.moveAgainTo(bestMovement.getX(), bestMovement.getY());
502 }
503 }
504 }
505
506 Main.map.mapView.repaint();
507 }
508 }
509
510 /**
511 * Does anything that needs to be done, then switches back to select mode.
512 * @param e
513 */
514 @Override
515 public void mouseReleased(MouseEvent e) {
516
517 if(!Main.map.mapView.isActiveLayerVisible())
518 return;
519
520 if (mode == Mode.select) {
521 // Nothing to be done
522 } else {
523 if (mode == Mode.create_new) {
524 if (e.getPoint().distance(initialMousePos) > initialMoveThreshold && newN1en != null) {
525 createNewRectangle();
526 }
527 } else if (mode == Mode.extrude) {
528 if (e.getClickCount() == 2 && e.getPoint().equals(initialMousePos)) {
529 // double click adds a new node
530 addNewNode(e);
531 } else if (e.getPoint().distance(initialMousePos) > initialMoveThreshold && newN1en != null && selectedSegment != null) {
532 // main extrusion commands
533 performExtrusion();
534 }
535 } else if (mode == Mode.translate || mode == Mode.translate_node) {
536 //Commit translate
537 //the move command is already committed in mouseDragged
538 joinNodesIfCollapsed(movingNodeList);
539 }
540
541 updateKeyModifiers(e);
542 // Switch back into select mode
543 Main.map.mapView.setNewCursor(ctrl ? cursorTranslate : alt ? cursorCreateNew : shift ? cursorCreateNodes : cursor, this);
544 Main.map.mapView.removeTemporaryLayer(this);
545 selectedSegment = null;
546 moveCommand = null;
547 mode = Mode.select;
548 dualAlignSegmentCollapsed = false;
549 updateStatusLine();
550 Main.map.mapView.repaint();
551 }
552 }
553
554 // -------------------------------------------------------------------------
555 // Custom methods
556 // -------------------------------------------------------------------------
557
558 /**
559 * Inserts node into nearby segment.
560 * @param e current mouse point
561 */
562 private void addNewNode(MouseEvent e) {
563 // Should maybe do the same as in DrawAction and fetch all nearby segments?
564 WaySegment ws = Main.map.mapView.getNearestWaySegment(e.getPoint(), OsmPrimitive.isSelectablePredicate);
565 if (ws != null) {
566 Node n = new Node(Main.map.mapView.getLatLon(e.getX(), e.getY()));
567 EastNorth A = ws.getFirstNode().getEastNorth();
568 EastNorth B = ws.getSecondNode().getEastNorth();
569 n.setEastNorth(Geometry.closestPointToSegment(A, B, n.getEastNorth()));
570 Way wnew = new Way(ws.way);
571 wnew.addNode(ws.lowerIndex+1, n);
572 SequenceCommand cmds = new SequenceCommand(tr("Add a new node to an existing way"),
573 new AddCommand(n), new ChangeCommand(ws.way, wnew));
574 Main.main.undoRedo.add(cmds);
575 }
576 }
577
578 /**
579 * Creates a new way that shares segment with selected way.
580 */
581 private void createNewRectangle() {
582 if (selectedSegment == null) return;
583 // crete a new rectangle
584 Collection<Command> cmds = new LinkedList<>();
585 Node third = new Node(newN2en);
586 Node fourth = new Node(newN1en);
587 Way wnew = new Way();
588 wnew.addNode(selectedSegment.getFirstNode());
589 wnew.addNode(selectedSegment.getSecondNode());
590 wnew.addNode(third);
591 if (!dualAlignSegmentCollapsed) {
592 // rectangle can degrade to triangle for dual alignment after collapsing
593 wnew.addNode(fourth);
594 }
595 // ... and close the way
596 wnew.addNode(selectedSegment.getFirstNode());
597 // undo support
598 cmds.add(new AddCommand(third));
599 if (!dualAlignSegmentCollapsed) {
600 cmds.add(new AddCommand(fourth));
601 }
602 cmds.add(new AddCommand(wnew));
603 Command c = new SequenceCommand(tr("Extrude Way"), cmds);
604 Main.main.undoRedo.add(c);
605 getCurrentDataSet().setSelected(wnew);
606 }
607
608 /**
609 * Does actual extrusion of {@link #selectedSegment}.
610 * Uses {@link #initialN1en}, {@link #initialN2en} saved in calculatePossibleDirections* call
611 * Uses {@link #newN1en}, {@link #newN2en} calculated by {@link #calculateBestMovementAndNewNodes}
612 */
613 private void performExtrusion() {
614 // create extrusion
615 Collection<Command> cmds = new LinkedList<>();
616 Way wnew = new Way(selectedSegment.way);
617 boolean wayWasModified = false;
618 boolean wayWasSingleSegment = wnew.getNodesCount() == 2;
619 int insertionPoint = selectedSegment.lowerIndex + 1;
620
621 //find if the new points overlap existing segments (in case of 90 degree angles)
622 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
623 boolean nodeOverlapsSegment = prevNode != null && Geometry.segmentsParallel(initialN1en, prevNode.getEastNorth(), initialN1en, newN1en);
624 // segmentAngleZero marks subset of nodeOverlapsSegment. nodeOverlapsSegment is true if angle between segments is 0 or PI, segmentAngleZero only if angle is 0
625 boolean segmentAngleZero = prevNode != null && Math.abs(Geometry.getCornerAngle(prevNode.getEastNorth(), initialN1en, newN1en)) < 1e-5;
626 boolean hasOtherWays = hasNodeOtherWays(selectedSegment.getFirstNode(), selectedSegment.way);
627 List<Node> changedNodes = new ArrayList<>();
628 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
629 //move existing node
630 Node n1Old = selectedSegment.getFirstNode();
631 cmds.add(new MoveCommand(n1Old, Main.getProjection().eastNorth2latlon(newN1en)));
632 changedNodes.add(n1Old);
633 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
634 // replace shared node with new one
635 Node n1Old = selectedSegment.getFirstNode();
636 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
637 wnew.addNode(insertionPoint, n1New);
638 wnew.removeNode(n1Old);
639 wayWasModified = true;
640 cmds.add(new AddCommand(n1New));
641 changedNodes.add(n1New);
642 } else {
643 //introduce new node
644 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
645 wnew.addNode(insertionPoint, n1New);
646 wayWasModified = true;
647 insertionPoint++;
648 cmds.add(new AddCommand(n1New));
649 changedNodes.add(n1New);
650 }
651
652 //find if the new points overlap existing segments (in case of 90 degree angles)
653 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
654 nodeOverlapsSegment = nextNode != null && Geometry.segmentsParallel(initialN2en, nextNode.getEastNorth(), initialN2en, newN2en);
655 segmentAngleZero = nextNode != null && Math.abs(Geometry.getCornerAngle(nextNode.getEastNorth(), initialN2en, newN2en)) < 1e-5;
656 hasOtherWays = hasNodeOtherWays(selectedSegment.getSecondNode(), selectedSegment.way);
657
658 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
659 //move existing node
660 Node n2Old = selectedSegment.getSecondNode();
661 cmds.add(new MoveCommand(n2Old, Main.getProjection().eastNorth2latlon(newN2en)));
662 changedNodes.add(n2Old);
663 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
664 // replace shared node with new one
665 Node n2Old = selectedSegment.getSecondNode();
666 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
667 wnew.addNode(insertionPoint, n2New);
668 wnew.removeNode(n2Old);
669 wayWasModified = true;
670 cmds.add(new AddCommand(n2New));
671 changedNodes.add(n2New);
672 } else {
673 //introduce new node
674 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
675 wnew.addNode(insertionPoint, n2New);
676 wayWasModified = true;
677 insertionPoint++;
678 cmds.add(new AddCommand(n2New));
679 changedNodes.add(n2New);
680 }
681
682 //the way was a single segment, close the way
683 if (wayWasSingleSegment) {
684 wnew.addNode(selectedSegment.getFirstNode());
685 wayWasModified = true;
686 }
687 if (wayWasModified) {
688 // we only need to change the way if its node list was really modified
689 cmds.add(new ChangeCommand(selectedSegment.way, wnew));
690 }
691 Command c = new SequenceCommand(tr("Extrude Way"), cmds);
692 Main.main.undoRedo.add(c);
693 joinNodesIfCollapsed(changedNodes);
694 }
695
696 private void joinNodesIfCollapsed(List<Node> changedNodes) {
697 if (!dualAlignActive || newN1en == null || newN2en == null) return;
698 if (newN1en.distance(newN2en) > 1e-6) return;
699 // If the dual alignment moved two nodes to the same point, merge them
700 Node targetNode = MergeNodesAction.selectTargetNode(changedNodes);
701 Node locNode = MergeNodesAction.selectTargetLocationNode(changedNodes);
702 Command mergeCmd = MergeNodesAction.mergeNodes(Main.main.getEditLayer(), changedNodes, targetNode, locNode);
703 if (mergeCmd!=null) {
704 Main.main.undoRedo.add(mergeCmd);
705 } else {
706 // undo extruding command itself
707 Main.main.undoRedo.undo();
708 }
709 }
710
711 /**
712 * This method tests if {@code node} has other ways apart from the given one.
713 * @param node
714 * @param myWay
715 * @return {@code true} if {@code node} belongs only to {@code myWay}, false if there are more ways.
716 */
717 private static boolean hasNodeOtherWays(Node node, Way myWay) {
718 for (OsmPrimitive p : node.getReferrers()) {
719 if (p instanceof Way && p.isUsable() && p != myWay)
720 return true;
721 }
722 return false;
723 }
724
725 /**
726 * Determines best movement from {@link #initialMousePos} to current mouse position,
727 * choosing one of the directions from {@link #possibleMoveDirections}.
728 * @param mouseEn current mouse position
729 * @return movement vector
730 */
731 private EastNorth calculateBestMovement(EastNorth mouseEn) {
732
733 EastNorth initialMouseEn = Main.map.mapView.getEastNorth(initialMousePos.x, initialMousePos.y);
734 EastNorth mouseMovement = initialMouseEn.sub(mouseEn);
735
736 double bestDistance = Double.POSITIVE_INFINITY;
737 EastNorth bestMovement = null;
738 activeMoveDirection = null;
739
740 //find the best movement direction and vector
741 for (ReferenceSegment direction : possibleMoveDirections) {
742 EastNorth movement = calculateSegmentOffset(initialN1en, initialN2en, direction.en, mouseEn);
743 if (movement == null) {
744 //if direction parallel to segment.
745 continue;
746 }
747
748 double distanceFromMouseMovement = movement.distance(mouseMovement);
749 if (bestDistance > distanceFromMouseMovement) {
750 bestDistance = distanceFromMouseMovement;
751 activeMoveDirection = direction;
752 bestMovement = movement;
753 }
754 }
755 return bestMovement;
756
757
758 }
759
760 /***
761 * This method calculates offset amount by which to move the given segment
762 * perpendicularly for it to be in line with mouse position.
763 * @param segmentP1 segment's first point
764 * @param segmentP2 segment's second point
765 * @param moveDirection direction of movement
766 * @param targetPos mouse position
767 * @return offset amount of P1 and P2.
768 */
769 private static EastNorth calculateSegmentOffset(EastNorth segmentP1, EastNorth segmentP2, EastNorth moveDirection,
770 EastNorth targetPos) {
771 EastNorth intersectionPoint;
772 if (segmentP1.distanceSq(segmentP2)>1e-7) {
773 intersectionPoint = Geometry.getLineLineIntersection(segmentP1, segmentP2, targetPos, targetPos.add(moveDirection));
774 } else {
775 intersectionPoint = Geometry.closestPointToLine(targetPos, targetPos.add(moveDirection), segmentP1);
776 }
777
778 if (intersectionPoint == null)
779 return null;
780 else
781 //return distance form base to target position
782 return intersectionPoint.sub(targetPos);
783 }
784
785 /**
786 * Gathers possible move directions - perpendicular to the selected segment
787 * and parallel to neighboring segments.
788 */
789 private void calculatePossibleDirectionsBySegment() {
790 // remember initial positions for segment nodes.
791 initialN1en = selectedSegment.getFirstNode().getEastNorth();
792 initialN2en = selectedSegment.getSecondNode().getEastNorth();
793
794 //add direction perpendicular to the selected segment
795 possibleMoveDirections = new ArrayList<>();
796 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
797 initialN1en.getY() - initialN2en.getY(),
798 initialN2en.getX() - initialN1en.getX()
799 ), initialN1en, initialN2en, true));
800
801
802 //add directions parallel to neighbor segments
803 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
804 if (prevNode != null) {
805 EastNorth en = prevNode.getEastNorth();
806 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
807 initialN1en.getX() - en.getX(),
808 initialN1en.getY() - en.getY()
809 ), initialN1en, en, false));
810 }
811
812 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
813 if (nextNode != null) {
814 EastNorth en = nextNode.getEastNorth();
815 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
816 initialN2en.getX() - en.getX(),
817 initialN2en.getY() - en.getY()
818 ), initialN2en, en, false));
819 }
820 }
821
822 /**
823 * Gathers possible move directions - along all adjacent segments.
824 */
825 private void calculatePossibleDirectionsByNode() {
826 // remember initial positions for segment nodes.
827 initialN1en = selectedNode.getEastNorth();
828 initialN2en = initialN1en;
829 possibleMoveDirections = new ArrayList<>();
830 for (OsmPrimitive p: selectedNode.getReferrers()) {
831 if (p instanceof Way && p.isUsable()) {
832 for (Node neighbor: ((Way) p).getNeighbours(selectedNode)) {
833 EastNorth en = neighbor.getEastNorth();
834 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
835 initialN1en.getX() - en.getX(),
836 initialN1en.getY() - en.getY()
837 ), initialN1en, en, false));
838 }
839 }
840 }
841 }
842
843 /**
844 * Checks dual alignment conditions:
845 * 1. selected segment has both neighboring segments,
846 * 2. selected segment is not parallel with neighboring segments.
847 * @return {@code true} if dual alignment conditions are satisfied
848 */
849 private boolean checkDualAlignConditions() {
850 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
851 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
852 if (prevNode == null || nextNode == null) {
853 return false;
854 }
855
856 EastNorth n1en = selectedSegment.getFirstNode().getEastNorth();
857 EastNorth n2en = selectedSegment.getSecondNode().getEastNorth();
858 if (n1en.distance(prevNode.getEastNorth())<1e-4 ||
859 n2en.distance(nextNode.getEastNorth())<1e-4) {
860 return false;
861 }
862
863 boolean prevSegmentParallel = Geometry.segmentsParallel(n1en, prevNode.getEastNorth(), n1en, n2en);
864 boolean nextSegmentParallel = Geometry.segmentsParallel(n2en, nextNode.getEastNorth(), n1en, n2en);
865 if (prevSegmentParallel || nextSegmentParallel) {
866 return false;
867 }
868
869 return true;
870 }
871
872 /**
873 * Gathers possible move directions - perpendicular to the selected segment only.
874 * Neighboring segments go to {@link #dualAlignSegment1} and {@link #dualAlignSegment2}.
875 */
876 private void calculatePossibleDirectionsForDualAlign() {
877 // remember initial positions for segment nodes.
878 initialN1en = selectedSegment.getFirstNode().getEastNorth();
879 initialN2en = selectedSegment.getSecondNode().getEastNorth();
880
881 // add direction perpendicular to the selected segment
882 possibleMoveDirections = new ArrayList<ReferenceSegment>();
883 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
884 initialN1en.getY() - initialN2en.getY(),
885 initialN2en.getX() - initialN1en.getX()
886 ), initialN1en, initialN2en, true));
887
888 // set neighboring segments
889 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
890 EastNorth prevNodeEn = prevNode.getEastNorth();
891 dualAlignSegment1 = new ReferenceSegment(new EastNorth(
892 initialN1en.getX() - prevNodeEn.getX(),
893 initialN1en.getY() - prevNodeEn.getY()
894 ), initialN1en, prevNodeEn, false);
895
896 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
897 EastNorth nextNodeEn = nextNode.getEastNorth();
898 dualAlignSegment2 = new ReferenceSegment(new EastNorth(
899 initialN2en.getX() - nextNodeEn.getX(),
900 initialN2en.getY() - nextNodeEn.getY()
901 ), initialN2en, nextNodeEn, false);
902 }
903
904 /**
905 * Calculate newN1en, newN2en best suitable for given mouse coordinates
906 * For dual align, calculates positions of new nodes, aligning them to neighboring segments.
907 * Elsewhere, just adds the vetor returned by calculateBestMovement to {@link #initialN1en}, {@link #initialN2en}.
908 * @return best movement vector
909 */
910 private EastNorth calculateBestMovementAndNewNodes(EastNorth mouseEn) {
911 EastNorth bestMovement = calculateBestMovement(mouseEn);
912 EastNorth n1movedEn = initialN1en.add(bestMovement), n2movedEn;
913
914 // find out the movement distance, in metres
915 double distance = Main.getProjection().eastNorth2latlon(initialN1en).greatCircleDistance(Main.getProjection().eastNorth2latlon(n1movedEn));
916 Main.map.statusLine.setDist(distance);
917 updateStatusLine();
918
919 if (dualAlignActive) {
920 // new positions of selected segment's nodes, without applying dual alignment
921 n1movedEn = initialN1en.add(bestMovement);
922 n2movedEn = initialN2en.add(bestMovement);
923
924 // calculate intersections of parallel shifted segment and the adjacent lines
925 newN1en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment1.p1, dualAlignSegment1.p2);
926 newN2en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment2.p1, dualAlignSegment2.p2);
927 if (newN1en == null || newN2en == null) return bestMovement;
928 if (keepSegmentDirection && isOppositeDirection(newN1en, newN2en, initialN1en, initialN2en)) {
929 EastNorth collapsedSegmentPosition = Geometry.getLineLineIntersection(dualAlignSegment1.p1, dualAlignSegment1.p2, dualAlignSegment2.p1, dualAlignSegment2.p2);
930 newN1en = collapsedSegmentPosition;
931 newN2en = collapsedSegmentPosition;
932 dualAlignSegmentCollapsed = true;
933 } else {
934 dualAlignSegmentCollapsed = false;
935 }
936 } else {
937 newN1en = n1movedEn;
938 newN2en = initialN2en.add(bestMovement);
939 }
940 return bestMovement;
941 }
942
943 /**
944 * Gets a node index from selected way before given index.
945 * @param index index of current node
946 * @return index of previous node or <code>-1</code> if there are no nodes there.
947 */
948 private int getPreviousNodeIndex(int index) {
949 if (index > 0)
950 return index - 1;
951 else if (selectedSegment.way.isClosed())
952 return selectedSegment.way.getNodesCount() - 2;
953 else
954 return -1;
955 }
956
957 /**
958 * Gets a node from selected way before given index.
959 * @param index index of current node
960 * @return previous node or <code>null</code> if there are no nodes there.
961 */
962 private Node getPreviousNode(int index) {
963 int indexPrev = getPreviousNodeIndex(index);
964 if (indexPrev >= 0)
965 return selectedSegment.way.getNode(indexPrev);
966 else
967 return null;
968 }
969
970
971 /**
972 * Gets a node index from selected way after given index.
973 * @param index index of current node
974 * @return index of next node or <code>-1</code> if there are no nodes there.
975 */
976 private int getNextNodeIndex(int index) {
977 int count = selectedSegment.way.getNodesCount();
978 if (index < count - 1)
979 return index + 1;
980 else if (selectedSegment.way.isClosed())
981 return 1;
982 else
983 return -1;
984 }
985
986 /**
987 * Gets a node from selected way after given index.
988 * @param index index of current node
989 * @return next node or <code>null</code> if there are no nodes there.
990 */
991 private Node getNextNode(int index) {
992 int indexNext = getNextNodeIndex(index);
993 if (indexNext >= 0)
994 return selectedSegment.way.getNode(indexNext);
995 else
996 return null;
997 }
998
999 // -------------------------------------------------------------------------
1000 // paint methods
1001 // -------------------------------------------------------------------------
1002
1003 @Override
1004 public void paint(Graphics2D g, MapView mv, Bounds box) {
1005 Graphics2D g2 = g;
1006 if (mode == Mode.select) {
1007 // Nothing to do
1008 } else {
1009 if (newN1en != null) {
1010
1011 Point p1 = mv.getPoint(initialN1en);
1012 Point p2 = mv.getPoint(initialN2en);
1013 Point p3 = mv.getPoint(newN1en);
1014 Point p4 = mv.getPoint(newN2en);
1015
1016 Point2D normalUnitVector = getNormalUniVector();
1017
1018 if (mode == Mode.extrude || mode == Mode.create_new) {
1019 g2.setColor(mainColor);
1020 g2.setStroke(mainStroke);
1021 // Draw rectangle around new area.
1022 GeneralPath b = new GeneralPath();
1023 b.moveTo(p1.x, p1.y); b.lineTo(p3.x, p3.y);
1024 b.lineTo(p4.x, p4.y); b.lineTo(p2.x, p2.y);
1025 b.lineTo(p1.x, p1.y);
1026 g2.draw(b);
1027
1028 if (dualAlignActive) {
1029 // Draw reference ways
1030 drawReferenceSegment(g2, mv, dualAlignSegment1);
1031 drawReferenceSegment(g2, mv, dualAlignSegment2);
1032 } else if (activeMoveDirection != null) {
1033 // Draw reference way
1034 drawReferenceSegment(g2, mv, activeMoveDirection);
1035
1036 // Draw right angle marker on first node position, only when moving at right angle
1037 if (activeMoveDirection.perpendicular) {
1038 // mirror RightAngle marker, so it is inside the extrude
1039 double headingRefWS = activeMoveDirection.p1.heading(activeMoveDirection.p2);
1040 double headingMoveDir = Math.atan2(normalUnitVector.getY(), normalUnitVector.getX());
1041 double headingDiff = headingRefWS - headingMoveDir;
1042 if (headingDiff < 0) headingDiff += 2 * Math.PI;
1043 boolean mirrorRA = Math.abs(headingDiff - Math.PI) > 1e-5;
1044 Point pr1 = mv.getPoint(activeMoveDirection.p1);
1045 drawAngleSymbol(g2, pr1, normalUnitVector, mirrorRA);
1046 }
1047 }
1048 } else if (mode == Mode.translate || mode == Mode.translate_node) {
1049 g2.setColor(mainColor);
1050 if (p1.distance(p2) < 3) {
1051 g2.setStroke(mainStroke);
1052 g2.drawOval((int)(p1.x-symbolSize/2), (int)(p1.y-symbolSize/2),
1053 (int)(symbolSize), (int)(symbolSize));
1054 } else {
1055 Line2D oldline = new Line2D.Double(p1, p2);
1056 g2.setStroke(oldLineStroke);
1057 g2.draw(oldline);
1058 }
1059
1060 if (dualAlignActive) {
1061 // Draw reference ways
1062 drawReferenceSegment(g2, mv, dualAlignSegment1);
1063 drawReferenceSegment(g2, mv, dualAlignSegment2);
1064 } else if (activeMoveDirection != null) {
1065
1066 g2.setColor(helperColor);
1067 g2.setStroke(helperStrokeDash);
1068 // Draw a guideline along the normal.
1069 Line2D normline;
1070 Point2D centerpoint = new Point2D.Double((p1.getX()+p2.getX())*0.5, (p1.getY()+p2.getY())*0.5);
1071 normline = createSemiInfiniteLine(centerpoint, normalUnitVector, g2);
1072 g2.draw(normline);
1073 // Draw right angle marker on initial position, only when moving at right angle
1074 if (activeMoveDirection.perpendicular) {
1075 // EastNorth units per pixel
1076 g2.setStroke(helperStrokeRA);
1077 g2.setColor(mainColor);
1078 drawAngleSymbol(g2, centerpoint, normalUnitVector, false);
1079 }
1080 }
1081 }
1082 }
1083 g2.setStroke(helperStrokeRA); // restore default stroke to prevent starnge occasional drawings
1084 }
1085 }
1086
1087 private Point2D getNormalUniVector() {
1088 double fac = 1.0 / activeMoveDirection.en.length();
1089 // mult by factor to get unit vector.
1090 Point2D normalUnitVector = new Point2D.Double(activeMoveDirection.en.getX() * fac, activeMoveDirection.en.getY() * fac);
1091
1092 // Check to see if our new N1 is in a positive direction with respect to the normalUnitVector.
1093 // Even if the x component is zero, we should still be able to discern using +0.0 and -0.0
1094 if (newN1en != null && ((newN1en.getX() > initialN1en.getX()) != (normalUnitVector.getX() > -0.0))) {
1095 // If not, use a sign-flipped version of the normalUnitVector.
1096 normalUnitVector = new Point2D.Double(-normalUnitVector.getX(), -normalUnitVector.getY());
1097 }
1098
1099 //HACK: swap Y, because the target pixels are top down, but EastNorth is bottom-up.
1100 //This is normally done by MapView.getPoint, but it does not work on vectors.
1101 normalUnitVector.setLocation(normalUnitVector.getX(), -normalUnitVector.getY());
1102 return normalUnitVector;
1103 }
1104
1105 /**
1106 * Returns true if from1-to1 and from2-to2 vertors directions are opposite
1107 */
1108 private boolean isOppositeDirection(EastNorth from1, EastNorth to1, EastNorth from2, EastNorth to2) {
1109 return (from1.getX()-to1.getX())*(from2.getX()-to2.getX())
1110 +(from1.getY()-to1.getY())*(from2.getY()-to2.getY()) < 0;
1111 }
1112
1113 /**
1114 * Draws right angle symbol at specified position.
1115 * @param g2 the Graphics2D object used to draw on
1116 * @param center center point of angle
1117 * @param normal vector of normal
1118 * @param mirror {@code true} if symbol should be mirrored by the normal
1119 */
1120 private void drawAngleSymbol(Graphics2D g2, Point2D center, Point2D normal, boolean mirror) {
1121 // EastNorth units per pixel
1122 double factor = 1.0/g2.getTransform().getScaleX();
1123 double raoffsetx = symbolSize*factor*normal.getX();
1124 double raoffsety = symbolSize*factor*normal.getY();
1125
1126 double cx = center.getX(), cy = center.getY();
1127 double k = mirror ? -1 : 1;
1128 Point2D ra1 = new Point2D.Double(cx + raoffsetx, cy + raoffsety);
1129 Point2D ra3 = new Point2D.Double(cx - raoffsety*k, cy + raoffsetx*k);
1130 Point2D ra2 = new Point2D.Double(ra1.getX() - raoffsety*k, ra1.getY() + raoffsetx*k);
1131
1132 GeneralPath ra = new GeneralPath();
1133 ra.moveTo((float)ra1.getX(), (float)ra1.getY());
1134 ra.lineTo((float)ra2.getX(), (float)ra2.getY());
1135 ra.lineTo((float)ra3.getX(), (float)ra3.getY());
1136 g2.setStroke(helperStrokeRA);
1137 g2.draw(ra);
1138 }
1139
1140 /**
1141 * Draws given reference segment.
1142 * @param g2 the Graphics2D object used to draw on
1143 * @param mv
1144 * @param seg the reference segment
1145 */
1146 private void drawReferenceSegment(Graphics2D g2, MapView mv, ReferenceSegment seg) {
1147 Point p1 = mv.getPoint(seg.p1);
1148 Point p2 = mv.getPoint(seg.p2);
1149 GeneralPath b = new GeneralPath();
1150 b.moveTo(p1.x, p1.y);
1151 b.lineTo(p2.x, p2.y);
1152 g2.setColor(helperColor);
1153 g2.setStroke(helperStrokeDash);
1154 g2.draw(b);
1155 }
1156
1157 /**
1158 * Creates a new Line that extends off the edge of the viewport in one direction
1159 * @param start The start point of the line
1160 * @param unitvector A unit vector denoting the direction of the line
1161 * @param g the Graphics2D object it will be used on
1162 * @return created line
1163 */
1164 private static Line2D createSemiInfiniteLine(Point2D start, Point2D unitvector, Graphics2D g) {
1165 Rectangle bounds = g.getDeviceConfiguration().getBounds();
1166 try {
1167 AffineTransform invtrans = g.getTransform().createInverse();
1168 Point2D widthpoint = invtrans.deltaTransform(new Point2D.Double(bounds.width,0), null);
1169 Point2D heightpoint = invtrans.deltaTransform(new Point2D.Double(0,bounds.height), null);
1170
1171 // Here we should end up with a gross overestimate of the maximum viewport diagonal in what
1172 // Graphics2D calls 'user space'. Essentially a manhattan distance of manhattan distances.
1173 // This can be used as a safe length of line to generate which will always go off-viewport.
1174 double linelength = Math.abs(widthpoint.getX()) + Math.abs(widthpoint.getY()) + Math.abs(heightpoint.getX()) + Math.abs(heightpoint.getY());
1175
1176 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * linelength) , start.getY() + (unitvector.getY() * linelength)));
1177 } catch (NoninvertibleTransformException e) {
1178 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * 10) , start.getY() + (unitvector.getY() * 10)));
1179 }
1180 }
1181}
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