source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/ExtrudeAction.java@ 7226

Last change on this file since 7226 was 7226, checked in by akks, 10 years ago

see #7991:patch by AlfonZ mod. Show and correctly handle segment collapsing in X mode
  • Property svn:eol-style set to native
File size: 49.2 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;
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;
27import javax.swing.JCheckBoxMenuItem;
28import javax.swing.JMenuItem;
29
30import org.openstreetmap.josm.Main;
31import org.openstreetmap.josm.actions.JosmAction;
32import org.openstreetmap.josm.actions.MergeNodesAction;
33import org.openstreetmap.josm.command.AddCommand;
34import org.openstreetmap.josm.command.ChangeCommand;
35import org.openstreetmap.josm.command.Command;
36import org.openstreetmap.josm.command.MoveCommand;
37import org.openstreetmap.josm.command.SequenceCommand;
38import org.openstreetmap.josm.data.Bounds;
39import org.openstreetmap.josm.data.coor.EastNorth;
40import org.openstreetmap.josm.data.osm.Node;
41import org.openstreetmap.josm.data.osm.OsmPrimitive;
42import org.openstreetmap.josm.data.osm.Way;
43import org.openstreetmap.josm.data.osm.WaySegment;
44import org.openstreetmap.josm.data.osm.visitor.paint.PaintColors;
45import org.openstreetmap.josm.gui.MainMenu;
46import org.openstreetmap.josm.gui.MapFrame;
47import org.openstreetmap.josm.gui.MapView;
48import org.openstreetmap.josm.gui.layer.Layer;
49import org.openstreetmap.josm.gui.layer.MapViewPaintable;
50import org.openstreetmap.josm.gui.layer.OsmDataLayer;
51import org.openstreetmap.josm.gui.util.KeyPressReleaseListener;
52import org.openstreetmap.josm.gui.util.GuiHelper;
53import org.openstreetmap.josm.gui.util.ModifierListener;
54import org.openstreetmap.josm.tools.Geometry;
55import org.openstreetmap.josm.tools.ImageProvider;
56import org.openstreetmap.josm.tools.Shortcut;
57import org.openstreetmap.josm.tools.Utils;
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 WaySegment selectedSegment = null;
76 private Node selectedNode = null;
77 private Color mainColor;
78 private 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 Stroke helperStrokeDash;
90 private Stroke helperStrokeRA;
91
92 private Stroke oldLineStroke;
93 private double symbolSize;
94 /**
95 * Possible directions to move to.
96 */
97 private List<ReferenceSegment> possibleMoveDirections;
98
99
100 /**
101 * Collection of nodes that is moved
102 */
103 private ArrayList<Node> movingNodeList;
104
105 /**
106 * The direction that is currently active.
107 */
108 private 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 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 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 ReferenceSegment dualAlignSegment1, dualAlignSegment2;
180 /** {@code true}, if new segment was collapsed */
181 private boolean dualAlignSegmentCollapsed;
182 // Dual alignment UI stuff
183 private final DualAlignChangeAction dualAlignChangeAction;
184 private final JCheckBoxMenuItem dualAlignCheckboxMenuItem;
185 private final 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"), "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"), "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 }
259 } else {
260 if (mode == Mode.translate)
261 rv = new StringBuilder(tr("Move a segment along its normal, then release the mouse button."));
262 else if (mode == Mode.translate_node)
263 rv = new StringBuilder(tr("Move the node along one of the segments, then release the mouse button."));
264 else if (mode == Mode.extrude)
265 rv = new StringBuilder(tr("Draw a rectangle of the desired size, then release the mouse button."));
266 else if (mode == Mode.create_new)
267 rv = new StringBuilder(tr("Draw a rectangle of the desired size, then release the mouse button."));
268 else {
269 Main.warn("Extrude: unknown mode " + mode);
270 rv = new StringBuilder();
271 }
272 if (dualAlignActive)
273 rv.append(" ").append(tr("Dual alignment active."));
274 }
275 return rv.toString();
276 }
277
278 @Override
279 public boolean layerIsSupported(Layer l) {
280 return l instanceof OsmDataLayer;
281 }
282
283 @Override
284 public void enterMode() {
285 super.enterMode();
286 Main.map.mapView.addMouseListener(this);
287 Main.map.mapView.addMouseMotionListener(this);
288 readPreferences();
289 ignoreNextKeyRelease = true;
290 Main.map.keyDetector.addKeyListener(this);
291 Main.map.keyDetector.addModifierListener(this);
292 }
293
294 private void readPreferences() {
295 initialMoveDelay = Main.pref.getInteger("edit.initial-move-delay",200);
296 initialMoveThreshold = Main.pref.getInteger("extrude.initial-move-threshold", 1);
297 mainColor = Main.pref.getColor(marktr("Extrude: main line"), null);
298 if (mainColor == null) mainColor = PaintColors.SELECTED.get();
299 helperColor = Main.pref.getColor(marktr("Extrude: helper line"), Color.ORANGE);
300 helperStrokeDash = GuiHelper.getCustomizedStroke(Main.pref.get("extrude.stroke.helper-line", "1 4"));
301 helperStrokeRA = new BasicStroke(1);
302 symbolSize = Main.pref.getDouble("extrude.angle-symbol-radius", 8);
303 nodeDragWithoutCtrl = Main.pref.getBoolean("extrude.drag-nodes-without-ctrl", false);
304 oldLineStroke = GuiHelper.getCustomizedStroke(Main.pref.get("extrude.ctrl.stroke.old-line", "1"));
305 mainStroke = GuiHelper.getCustomizedStroke(Main.pref.get("extrude.stroke.main", "3"));
306
307 ignoreSharedNodes = Main.pref.getBoolean("extrude.ignore-shared-nodes", true);
308 dualAlignCheckboxMenuItem.getAction().setEnabled(true);
309 useRepeatedShortcut = Main.pref.getBoolean("extrude.dualalign.toggleOnRepeatedX", true);
310 keepSegmentDirection = Main.pref.getBoolean("extrude.dualalign.keep-segment-direction", true);
311 }
312
313 @Override
314 public void exitMode() {
315 Main.map.mapView.removeMouseListener(this);
316 Main.map.mapView.removeMouseMotionListener(this);
317 Main.map.mapView.removeTemporaryLayer(this);
318 dualAlignCheckboxMenuItem.getAction().setEnabled(false);
319 Main.map.keyDetector.removeKeyListener(this);
320 Main.map.keyDetector.removeModifierListener(this);
321 super.exitMode();
322 }
323
324 // -------------------------------------------------------------------------
325 // Event handlers
326 // -------------------------------------------------------------------------
327
328 /**
329 * This method is called to indicate different modes via cursor when the Alt/Ctrl/Shift modifier is pressed,
330 */
331 @Override
332 public void modifiersChanged(int modifiers) {
333 if (!Main.isDisplayingMapView() || !Main.map.mapView.isActiveLayerDrawable())
334 return;
335 updateKeyModifiers(modifiers);
336 if (mode == Mode.select) {
337 Main.map.mapView.setNewCursor(ctrl ? cursorTranslate : alt ? cursorCreateNew : shift ? cursorCreateNodes : cursor, this);
338 }
339 };
340
341 @Override
342 public void doKeyPressed(KeyEvent e) {
343 }
344
345 @Override
346 public void doKeyReleased(KeyEvent e) {
347 if (!dualAlignShortcut.isEvent(e) && !(useRepeatedShortcut && getShortcut().isEvent(e)))
348 return;
349 if (ignoreNextKeyRelease) {
350 ignoreNextKeyRelease = false;
351 } else {
352 toggleDualAlign();
353 }
354 }
355 /**
356 * Toggles dual alignment mode.
357 */
358 private void toggleDualAlign() {
359 dualAlignEnabled = !dualAlignEnabled;
360 dualAlignCheckboxMenuItem.setState(dualAlignEnabled);
361 updateStatusLine();
362 }
363
364 /**
365 * If the left mouse button is pressed over a segment or a node, switches
366 * to appropriate {@link #mode}, depending on Ctrl/Alt/Shift modifiers and
367 * {@link #dualAlignEnabled}.
368 * @param e
369 */
370 @Override
371 public void mousePressed(MouseEvent e) {
372 if(!Main.map.mapView.isActiveLayerVisible())
373 return;
374 if (!(Boolean)this.getValue("active"))
375 return;
376 if (e.getButton() != MouseEvent.BUTTON1)
377 return;
378
379 requestFocusInMapView();
380 updateKeyModifiers(e);
381
382 selectedNode = Main.map.mapView.getNearestNode(e.getPoint(), OsmPrimitive.isSelectablePredicate);
383 selectedSegment = Main.map.mapView.getNearestWaySegment(e.getPoint(), OsmPrimitive.isSelectablePredicate);
384
385 // If nothing gets caught, stay in select mode
386 if (selectedSegment == null && selectedNode == null) return;
387
388 if (selectedNode != null) {
389 if (ctrl || nodeDragWithoutCtrl) {
390 movingNodeList = new ArrayList<>();
391 movingNodeList.add(selectedNode);
392 calculatePossibleDirectionsByNode();
393 if (possibleMoveDirections.isEmpty()) {
394 // if no directions fould, do not enter dragging mode
395 return;
396 }
397 mode = Mode.translate_node;
398 dualAlignActive = false;
399 }
400 } else {
401 // Otherwise switch to another mode
402 if (dualAlignEnabled && checkDualAlignConditions()) {
403 dualAlignActive = true;
404 calculatePossibleDirectionsForDualAlign();
405 dualAlignSegmentCollapsed = false;
406 } else {
407 dualAlignActive = false;
408 calculatePossibleDirectionsBySegment();
409 }
410 if (ctrl) {
411 mode = Mode.translate;
412 movingNodeList = new ArrayList<>();
413 movingNodeList.add(selectedSegment.getFirstNode());
414 movingNodeList.add(selectedSegment.getSecondNode());
415 } else if (alt) {
416 mode = Mode.create_new;
417 // create a new segment and then select and extrude the new segment
418 getCurrentDataSet().setSelected(selectedSegment.way);
419 alwaysCreateNodes = true;
420 } else {
421 mode = Mode.extrude;
422 getCurrentDataSet().setSelected(selectedSegment.way);
423 alwaysCreateNodes = shift;
424 }
425 }
426
427 // Signifies that nothing has happened yet
428 newN1en = null;
429 newN2en = null;
430 moveCommand = null;
431 moveCommand2 = null;
432
433 Main.map.mapView.addTemporaryLayer(this);
434
435 updateStatusLine();
436 Main.map.mapView.repaint();
437
438 // Make note of time pressed
439 mouseDownTime = System.currentTimeMillis();
440
441 // Make note of mouse position
442 initialMousePos = e.getPoint();
443 }
444
445 /**
446 * Performs action depending on what {@link #mode} we're in.
447 * @param e
448 */
449 @Override
450 public void mouseDragged(MouseEvent e) {
451 if(!Main.map.mapView.isActiveLayerVisible())
452 return;
453
454 // do not count anything as a drag if it lasts less than 100 milliseconds.
455 if (System.currentTimeMillis() - mouseDownTime < initialMoveDelay)
456 return;
457
458 if (mode == Mode.select) {
459 // Just sit tight and wait for mouse to be released.
460 } else {
461 //move, create new and extrude mode - move the selected segment
462
463 EastNorth mouseEn = Main.map.mapView.getEastNorth(e.getPoint().x, e.getPoint().y);
464 EastNorth bestMovement = calculateBestMovementAndNewNodes(mouseEn);
465
466 Main.map.mapView.setNewCursor(Cursor.MOVE_CURSOR, this);
467
468 if (dualAlignActive) {
469 if (mode == Mode.extrude || mode == Mode.create_new) {
470 // nothing here
471 } else if (mode == Mode.translate) {
472 EastNorth movement1 = initialN1en.sub(newN1en);
473 EastNorth movement2 = initialN2en.sub(newN2en);
474 // move nodes to new position
475 if (moveCommand == null || moveCommand2 == null) {
476 // make a new move commands
477 moveCommand = new MoveCommand(movingNodeList.get(0), movement1.getX(), movement1.getY());
478 moveCommand2 = new MoveCommand(movingNodeList.get(1), movement2.getX(), movement2.getY());
479 Command c = new SequenceCommand(tr("Extrude Way"), moveCommand, moveCommand2);
480 Main.main.undoRedo.add(c);
481 } else {
482 // reuse existing move commands
483 moveCommand.moveAgainTo(movement1.getX(), movement1.getY());
484 moveCommand2.moveAgainTo(movement2.getX(), movement2.getY());
485 }
486 }
487 } else {
488 if (mode == Mode.extrude || mode == Mode.create_new) {
489 //nothing here
490 } else if (mode == Mode.translate_node || mode == Mode.translate) {
491 //move nodes to new position
492 if (moveCommand == null) {
493 //make a new move command
494 moveCommand = new MoveCommand(new ArrayList<OsmPrimitive>(movingNodeList), bestMovement);
495 Main.main.undoRedo.add(moveCommand);
496 } else {
497 //reuse existing move command
498 moveCommand.moveAgainTo(bestMovement.getX(), bestMovement.getY());
499 }
500 }
501 }
502
503 Main.map.mapView.repaint();
504 }
505 }
506
507 /**
508 * Does anything that needs to be done, then switches back to select mode.
509 * @param e
510 */
511 @Override
512 public void mouseReleased(MouseEvent e) {
513
514 if(!Main.map.mapView.isActiveLayerVisible())
515 return;
516
517 if (mode == Mode.select) {
518 // Nothing to be done
519 } else {
520 if (mode == Mode.create_new) {
521 if (e.getPoint().distance(initialMousePos) > initialMoveThreshold && newN1en != null) {
522 createNewRectangle();
523 }
524 } else if (mode == Mode.extrude) {
525 if( e.getClickCount() == 2 && e.getPoint().equals(initialMousePos) ) {
526 // double click adds a new node
527 addNewNode(e);
528 }
529 else if (e.getPoint().distance(initialMousePos) > initialMoveThreshold && newN1en != null && selectedSegment != null) {
530 // main extrusion commands
531 performExtrusion();
532 }
533 } else if (mode == Mode.translate || mode == Mode.translate_node) {
534 //Commit translate
535 //the move command is already committed in mouseDragged
536 joinNodesIfCollapsed(movingNodeList);
537 }
538
539 updateKeyModifiers(e);
540 // Switch back into select mode
541 Main.map.mapView.setNewCursor(ctrl ? cursorTranslate : alt ? cursorCreateNew : shift ? cursorCreateNodes : cursor, this);
542 Main.map.mapView.removeTemporaryLayer(this);
543 selectedSegment = null;
544 moveCommand = null;
545 mode = Mode.select;
546 updateStatusLine();
547 Main.map.mapView.repaint();
548 }
549 }
550
551 // -------------------------------------------------------------------------
552 // Custom methods
553 // -------------------------------------------------------------------------
554
555 /**
556 * Inserts node into nearby segment.
557 * @param e current mouse point
558 */
559 private void addNewNode(MouseEvent e) {
560 // Should maybe do the same as in DrawAction and fetch all nearby segments?
561 WaySegment ws = Main.map.mapView.getNearestWaySegment(e.getPoint(), OsmPrimitive.isSelectablePredicate);
562 if (ws != null) {
563 Node n = new Node(Main.map.mapView.getLatLon(e.getX(), e.getY()));
564 EastNorth A = ws.getFirstNode().getEastNorth();
565 EastNorth B = ws.getSecondNode().getEastNorth();
566 n.setEastNorth(Geometry.closestPointToSegment(A, B, n.getEastNorth()));
567 Way wnew = new Way(ws.way);
568 wnew.addNode(ws.lowerIndex+1, n);
569 SequenceCommand cmds = new SequenceCommand(tr("Add a new node to an existing way"),
570 new AddCommand(n), new ChangeCommand(ws.way, wnew));
571 Main.main.undoRedo.add(cmds);
572 }
573 }
574
575 /**
576 * Creates a new way that shares segment with selected way.
577 */
578 private void createNewRectangle() {
579 if (selectedSegment == null) return;
580 // crete a new rectangle
581 Collection<Command> cmds = new LinkedList<>();
582 Node third = new Node(newN2en);
583 Node fourth = new Node(newN1en);
584 Way wnew = new Way();
585 wnew.addNode(selectedSegment.getFirstNode());
586 wnew.addNode(selectedSegment.getSecondNode());
587 wnew.addNode(third);
588 wnew.addNode(fourth);
589 // ... and close the way
590 wnew.addNode(selectedSegment.getFirstNode());
591 // undo support
592 cmds.add(new AddCommand(third));
593 cmds.add(new AddCommand(fourth));
594 cmds.add(new AddCommand(wnew));
595 Command c = new SequenceCommand(tr("Extrude Way"), cmds);
596 Main.main.undoRedo.add(c);
597 getCurrentDataSet().setSelected(wnew);
598 }
599
600 /**
601 * Does actual extrusion of {@link #selectedSegment}.
602 * Uses {@link #initialN1en}, {@link #initialN2en} saved in calculatePossibleDirections* call
603 * Uses {@link #newN1en}, {@link #newN2en} calculated by {@link #calculateBestMovementAndNewNodes}
604 */
605 private void performExtrusion() {
606 // create extrusion
607 Collection<Command> cmds = new LinkedList<>();
608 Way wnew = new Way(selectedSegment.way);
609 boolean wayWasModified = false;
610 boolean wayWasSingleSegment = wnew.getNodesCount() == 2;
611 int insertionPoint = selectedSegment.lowerIndex + 1;
612
613 //find if the new points overlap existing segments (in case of 90 degree angles)
614 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
615 boolean nodeOverlapsSegment = prevNode != null && Geometry.segmentsParallel(initialN1en, prevNode.getEastNorth(), initialN1en, newN1en);
616 // segmentAngleZero marks subset of nodeOverlapsSegment. nodeOverlapsSegment is true if angle between segments is 0 or PI, segmentAngleZero only if angle is 0
617 boolean segmentAngleZero = prevNode != null && Math.abs(Geometry.getCornerAngle(prevNode.getEastNorth(), initialN1en, newN1en)) < 1e-5;
618 boolean hasOtherWays = hasNodeOtherWays(selectedSegment.getFirstNode(), selectedSegment.way);
619 ArrayList<Node> changedNodes = new ArrayList<>();
620 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
621 //move existing node
622 Node n1Old = selectedSegment.getFirstNode();
623 cmds.add(new MoveCommand(n1Old, Main.getProjection().eastNorth2latlon(newN1en)));
624 changedNodes.add(n1Old);
625 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
626 // replace shared node with new one
627 Node n1Old = selectedSegment.getFirstNode();
628 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
629 wnew.addNode(insertionPoint, n1New);
630 wnew.removeNode(n1Old);
631 wayWasModified = true;
632 cmds.add(new AddCommand(n1New));
633 changedNodes.add(n1New);
634 } else {
635 //introduce new node
636 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
637 wnew.addNode(insertionPoint, n1New);
638 wayWasModified = true;
639 insertionPoint ++;
640 cmds.add(new AddCommand(n1New));
641 changedNodes.add(n1New);
642 }
643
644 //find if the new points overlap existing segments (in case of 90 degree angles)
645 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
646 nodeOverlapsSegment = nextNode != null && Geometry.segmentsParallel(initialN2en, nextNode.getEastNorth(), initialN2en, newN2en);
647 segmentAngleZero = nextNode != null && Math.abs(Geometry.getCornerAngle(nextNode.getEastNorth(), initialN2en, newN2en)) < 1e-5;
648 hasOtherWays = hasNodeOtherWays(selectedSegment.getSecondNode(), selectedSegment.way);
649
650 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
651 //move existing node
652 Node n2Old = selectedSegment.getSecondNode();
653 cmds.add(new MoveCommand(n2Old, Main.getProjection().eastNorth2latlon(newN2en)));
654 changedNodes.add(n2Old);
655 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
656 // replace shared node with new one
657 Node n2Old = selectedSegment.getSecondNode();
658 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
659 wnew.addNode(insertionPoint, n2New);
660 wnew.removeNode(n2Old);
661 wayWasModified = true;
662 cmds.add(new AddCommand(n2New));
663 changedNodes.add(n2New);
664 } else {
665 //introduce new node
666 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
667 wnew.addNode(insertionPoint, n2New);
668 wayWasModified = true;
669 insertionPoint ++;
670 cmds.add(new AddCommand(n2New));
671 changedNodes.add(n2New);
672 }
673
674 //the way was a single segment, close the way
675 if (wayWasSingleSegment) {
676 wnew.addNode(selectedSegment.getFirstNode());
677 wayWasModified = true;
678 }
679 if (wayWasModified) {
680 // we only need to change the way if its node list was really modified
681 cmds.add(new ChangeCommand(selectedSegment.way, wnew));
682 }
683 Command c = new SequenceCommand(tr("Extrude Way"), cmds);
684 Main.main.undoRedo.add(c);
685 joinNodesIfCollapsed(changedNodes);
686 }
687
688 private void joinNodesIfCollapsed(List<Node> changedNodes) {
689 if (newN1en.distance(newN2en) < 1e-6) {
690 // If the dual alignment created moved two nodes to the same point, merge them
691 Node targetNode = MergeNodesAction.selectTargetNode(changedNodes);
692 Node locNode = MergeNodesAction.selectTargetLocationNode(changedNodes);
693 Command mergeCmd = MergeNodesAction.mergeNodes(Main.main.getEditLayer(), changedNodes, targetNode, locNode);
694 if (mergeCmd!=null) {
695 Main.main.undoRedo.add(mergeCmd);
696 } else {
697 // undo extruding command itself
698 Main.main.undoRedo.undo();
699 }
700 }
701 }
702
703 /**
704 * This method tests if {@code node} has other ways apart from the given one.
705 * @param node
706 * @param myWay
707 * @return {@code true} if {@code node} belongs only to {@code myWay}, false if there are more ways.
708 */
709 private static boolean hasNodeOtherWays(Node node, Way myWay) {
710 for (OsmPrimitive p : node.getReferrers()) {
711 if (p instanceof Way && p.isUsable() && p != myWay)
712 return true;
713 }
714 return false;
715 }
716
717 /**
718 * Determines best movement from {@link #initialMousePos} to current mouse position,
719 * choosing one of the directions from {@link #possibleMoveDirections}.
720 * @param mouseEn current mouse position
721 * @return movement vector
722 */
723 private EastNorth calculateBestMovement(EastNorth mouseEn) {
724
725 EastNorth initialMouseEn = Main.map.mapView.getEastNorth(initialMousePos.x, initialMousePos.y);
726 EastNorth mouseMovement = initialMouseEn.sub(mouseEn);
727
728 double bestDistance = Double.POSITIVE_INFINITY;
729 EastNorth bestMovement = null;
730 activeMoveDirection = null;
731
732 //find the best movement direction and vector
733 for (ReferenceSegment direction : possibleMoveDirections) {
734 EastNorth movement = calculateSegmentOffset(initialN1en, initialN2en, direction.en, mouseEn);
735 if (movement == null) {
736 //if direction parallel to segment.
737 continue;
738 }
739
740 double distanceFromMouseMovement = movement.distance(mouseMovement);
741 if (bestDistance > distanceFromMouseMovement) {
742 bestDistance = distanceFromMouseMovement;
743 activeMoveDirection = direction;
744 bestMovement = movement;
745 }
746 }
747 return bestMovement;
748
749
750 }
751
752 /***
753 * This method calculates offset amount by which to move the given segment
754 * perpendicularly for it to be in line with mouse position.
755 * @param segmentP1 segment's first point
756 * @param segmentP2 segment's second point
757 * @param moveDirection direction of movement
758 * @param targetPos mouse position
759 * @return offset amount of P1 and P2.
760 */
761 private static EastNorth calculateSegmentOffset(EastNorth segmentP1, EastNorth segmentP2, EastNorth moveDirection,
762 EastNorth targetPos) {
763 EastNorth intersectionPoint;
764 if (segmentP1.distanceSq(segmentP2)>1e-7) {
765 intersectionPoint = Geometry.getLineLineIntersection(segmentP1, segmentP2, targetPos, targetPos.add(moveDirection));
766 } else {
767 intersectionPoint = Geometry.closestPointToLine(targetPos, targetPos.add(moveDirection), segmentP1);
768 }
769
770 if (intersectionPoint == null)
771 return null;
772 else
773 //return distance form base to target position
774 return intersectionPoint.sub(targetPos);
775 }
776
777 /**
778 * Gathers possible move directions - perpendicular to the selected segment
779 * and parallel to neighboring segments.
780 */
781 private void calculatePossibleDirectionsBySegment() {
782 // remember initial positions for segment nodes.
783 initialN1en = selectedSegment.getFirstNode().getEastNorth();
784 initialN2en = selectedSegment.getSecondNode().getEastNorth();
785
786 //add direction perpendicular to the selected segment
787 possibleMoveDirections = new ArrayList<>();
788 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
789 initialN1en.getY() - initialN2en.getY(),
790 initialN2en.getX() - initialN1en.getX()
791 ), initialN1en, initialN2en, true));
792
793
794 //add directions parallel to neighbor segments
795 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
796 if (prevNode != null) {
797 EastNorth en = prevNode.getEastNorth();
798 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
799 initialN1en.getX() - en.getX(),
800 initialN1en.getY() - en.getY()
801 ), initialN1en, en, false));
802 }
803
804 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
805 if (nextNode != null) {
806 EastNorth en = nextNode.getEastNorth();
807 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
808 initialN2en.getX() - en.getX(),
809 initialN2en.getY() - en.getY()
810 ), initialN2en, en, false));
811 }
812 }
813
814 /**
815 * Gathers possible move directions - along all adjacent segments.
816 */
817 private void calculatePossibleDirectionsByNode() {
818 // remember initial positions for segment nodes.
819 initialN1en = selectedNode.getEastNorth();
820 initialN2en = initialN1en;
821 possibleMoveDirections = new ArrayList<>();
822 for (OsmPrimitive p: selectedNode.getReferrers()) {
823 if (p instanceof Way && p.isUsable()) {
824 for (Node neighbor: ((Way) p).getNeighbours(selectedNode)) {
825 EastNorth en = neighbor.getEastNorth();
826 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
827 initialN1en.getX() - en.getX(),
828 initialN1en.getY() - en.getY()
829 ), initialN1en, en, false));
830 }
831 }
832 }
833 }
834
835 /**
836 * Checks dual alignment conditions:
837 * 1. selected segment has both neighboring segments,
838 * 2. selected segment is not parallel with neighboring segments.
839 * @return {@code true} if dual alignment conditions are satisfied
840 */
841 private boolean checkDualAlignConditions() {
842 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
843 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
844 if (prevNode == null || nextNode == null) {
845 return false;
846 }
847
848 EastNorth n1en = selectedSegment.getFirstNode().getEastNorth();
849 EastNorth n2en = selectedSegment.getSecondNode().getEastNorth();
850 boolean prevSegmentParallel = Geometry.segmentsParallel(n1en, prevNode.getEastNorth(), n1en, n2en);
851 boolean nextSegmentParallel = Geometry.segmentsParallel(n2en, nextNode.getEastNorth(), n1en, n2en);
852 if (prevSegmentParallel || nextSegmentParallel) {
853 return false;
854 }
855
856 return true;
857 }
858
859 /**
860 * Gathers possible move directions - perpendicular to the selected segment only.
861 * Neighboring segments go to {@link #dualAlignSegment1} and {@link #dualAlignSegment2}.
862 */
863 private void calculatePossibleDirectionsForDualAlign() {
864 // remember initial positions for segment nodes.
865 initialN1en = selectedSegment.getFirstNode().getEastNorth();
866 initialN2en = selectedSegment.getSecondNode().getEastNorth();
867
868 // add direction perpendicular to the selected segment
869 possibleMoveDirections = new ArrayList<ReferenceSegment>();
870 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
871 initialN1en.getY() - initialN2en.getY(),
872 initialN2en.getX() - initialN1en.getX()
873 ), initialN1en, initialN2en, true));
874
875 // set neighboring segments
876 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
877 EastNorth prevNodeEn = prevNode.getEastNorth();
878 dualAlignSegment1 = new ReferenceSegment(new EastNorth(
879 initialN1en.getX() - prevNodeEn.getX(),
880 initialN1en.getY() - prevNodeEn.getY()
881 ), initialN1en, prevNodeEn, false);
882
883 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
884 EastNorth nextNodeEn = nextNode.getEastNorth();
885 dualAlignSegment2 = new ReferenceSegment(new EastNorth(
886 initialN2en.getX() - nextNodeEn.getX(),
887 initialN2en.getY() - nextNodeEn.getY()
888 ), initialN2en, nextNodeEn, false);
889 }
890
891 /**
892 * Calculate newN1en, newN2en best suitable for given mouse coordinates
893 * For dual align, calculates positions of new nodes, aligning them to neighboring segments.
894 * Elsewhere, just adds the vetor returned by calculateBestMovement to {@link #initialN1en}, {@link #initialN2en}.
895 * @return best movement vector
896 */
897 private EastNorth calculateBestMovementAndNewNodes(EastNorth mouseEn) {
898 EastNorth bestMovement = calculateBestMovement(mouseEn);
899 EastNorth n1movedEn = initialN1en.add(bestMovement), n2movedEn;
900
901 // find out the movement distance, in metres
902 double distance = Main.getProjection().eastNorth2latlon(initialN1en).greatCircleDistance(Main.getProjection().eastNorth2latlon(n1movedEn));
903 Main.map.statusLine.setDist(distance);
904 updateStatusLine();
905
906 if (dualAlignActive) {
907 // new positions of selected segment's nodes, without applying dual alignment
908 n1movedEn = initialN1en.add(bestMovement);
909 n2movedEn = initialN2en.add(bestMovement);
910
911 // calculate intersections of parallel shifted segment and the adjacent lines
912 newN1en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment1.p1, dualAlignSegment1.p2);
913 newN2en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment2.p1, dualAlignSegment2.p2);
914 if (newN1en == null || newN2en == null) return bestMovement;
915 if (keepSegmentDirection && isOppositeDirection(newN1en, newN2en, initialN1en, initialN2en)) {
916 EastNorth collapsedSegmentPosition = Geometry.getLineLineIntersection(dualAlignSegment1.p1, dualAlignSegment1.p2, dualAlignSegment2.p1, dualAlignSegment2.p2);
917 newN1en = collapsedSegmentPosition;
918 newN2en = collapsedSegmentPosition;
919 dualAlignSegmentCollapsed = true;
920 } else {
921 dualAlignSegmentCollapsed = false;
922 }
923 } else {
924 newN1en = n1movedEn;
925 newN2en = initialN2en.add(bestMovement);
926 }
927 return bestMovement;
928 }
929
930 /**
931 * Gets a node index from selected way before given index.
932 * @param index index of current node
933 * @return index of previous node or <code>-1</code> if there are no nodes there.
934 */
935 private int getPreviousNodeIndex(int index) {
936 if (index > 0)
937 return index - 1;
938 else if (selectedSegment.way.isClosed())
939 return selectedSegment.way.getNodesCount() - 2;
940 else
941 return -1;
942 }
943
944 /**
945 * Gets a node from selected way before given index.
946 * @param index index of current node
947 * @return previous node or <code>null</code> if there are no nodes there.
948 */
949 private Node getPreviousNode(int index) {
950 int indexPrev = getPreviousNodeIndex(index);
951 if (indexPrev >= 0)
952 return selectedSegment.way.getNode(indexPrev);
953 else
954 return null;
955 }
956
957
958 /**
959 * Gets a node index from selected way after given index.
960 * @param index index of current node
961 * @return index of next node or <code>-1</code> if there are no nodes there.
962 */
963 private int getNextNodeIndex(int index) {
964 int count = selectedSegment.way.getNodesCount();
965 if (index < count - 1)
966 return index + 1;
967 else if (selectedSegment.way.isClosed())
968 return 1;
969 else
970 return -1;
971 }
972
973 /**
974 * Gets a node from selected way after given index.
975 * @param index index of current node
976 * @return next node or <code>null</code> if there are no nodes there.
977 */
978 private Node getNextNode(int index) {
979 int indexNext = getNextNodeIndex(index);
980 if (indexNext >= 0)
981 return selectedSegment.way.getNode(indexNext);
982 else
983 return null;
984 }
985
986 // -------------------------------------------------------------------------
987 // paint methods
988 // -------------------------------------------------------------------------
989
990 @Override
991 public void paint(Graphics2D g, MapView mv, Bounds box) {
992 Graphics2D g2 = g;
993 if (mode == Mode.select) {
994 // Nothing to do
995 } else {
996 if (newN1en != null) {
997
998 Point p1 = mv.getPoint(initialN1en);
999 Point p2 = mv.getPoint(initialN2en);
1000 Point p3 = mv.getPoint(newN1en);
1001 Point p4 = mv.getPoint(newN2en);
1002
1003 Point2D normalUnitVector = getNormalUniVector();
1004
1005 if (mode == Mode.extrude || mode == Mode.create_new) {
1006 g2.setColor(mainColor);
1007 g2.setStroke(mainStroke);
1008 // Draw rectangle around new area.
1009 GeneralPath b = new GeneralPath();
1010 b.moveTo(p1.x, p1.y); b.lineTo(p3.x, p3.y);
1011 b.lineTo(p4.x, p4.y); b.lineTo(p2.x, p2.y);
1012 b.lineTo(p1.x, p1.y);
1013 g2.draw(b);
1014
1015 if (dualAlignActive) {
1016 // Draw reference ways
1017 drawReferenceSegment(g2, mv, dualAlignSegment1);
1018 drawReferenceSegment(g2, mv, dualAlignSegment2);
1019 } else if (activeMoveDirection != null) {
1020 // Draw reference way
1021 drawReferenceSegment(g2, mv, activeMoveDirection);
1022
1023 // Draw right angle marker on first node position, only when moving at right angle
1024 if (activeMoveDirection.perpendicular) {
1025 // mirror RightAngle marker, so it is inside the extrude
1026 double headingRefWS = activeMoveDirection.p1.heading(activeMoveDirection.p2);
1027 double headingMoveDir = Math.atan2(normalUnitVector.getY(), normalUnitVector.getX());
1028 double headingDiff = headingRefWS - headingMoveDir;
1029 if (headingDiff < 0) headingDiff += 2 * Math.PI;
1030 boolean mirrorRA = Math.abs(headingDiff - Math.PI) > 1e-5;
1031 Point pr1 = mv.getPoint(activeMoveDirection.p1);
1032 drawAngleSymbol(g2, pr1, normalUnitVector, mirrorRA);
1033 }
1034 }
1035 } else if (mode == Mode.translate || mode == Mode.translate_node) {
1036 g2.setColor(mainColor);
1037 if (p1.distance(p2) < 3) {
1038 g2.setStroke(mainStroke);
1039 g2.drawOval((int)(p1.x-symbolSize/2), (int)(p1.y-symbolSize/2),
1040 (int)(symbolSize), (int)(symbolSize));
1041 } else {
1042 Line2D oldline = new Line2D.Double(p1, p2);
1043 g2.setStroke(oldLineStroke);
1044 g2.draw(oldline);
1045 }
1046
1047 if (dualAlignActive) {
1048 // Draw reference ways
1049 drawReferenceSegment(g2, mv, dualAlignSegment1);
1050 drawReferenceSegment(g2, mv, dualAlignSegment2);
1051 } else if (activeMoveDirection != null) {
1052
1053 g2.setColor(helperColor);
1054 g2.setStroke(helperStrokeDash);
1055 // Draw a guideline along the normal.
1056 Line2D normline;
1057 Point2D centerpoint = new Point2D.Double((p1.getX()+p2.getX())*0.5, (p1.getY()+p2.getY())*0.5);
1058 normline = createSemiInfiniteLine(centerpoint, normalUnitVector, g2);
1059 g2.draw(normline);
1060 // Draw right angle marker on initial position, only when moving at right angle
1061 if (activeMoveDirection.perpendicular) {
1062 // EastNorth units per pixel
1063 g2.setStroke(helperStrokeRA);
1064 g2.setColor(mainColor);
1065 drawAngleSymbol(g2, centerpoint, normalUnitVector, false);
1066 }
1067 }
1068 }
1069 }
1070 g2.setStroke(helperStrokeRA); // restore default stroke to prevent starnge occasional drawings
1071 }
1072 }
1073
1074 private Point2D getNormalUniVector() {
1075 double fac = 1.0 / activeMoveDirection.en.length();
1076 // mult by factor to get unit vector.
1077 Point2D normalUnitVector = new Point2D.Double(activeMoveDirection.en.getX() * fac, activeMoveDirection.en.getY() * fac);
1078
1079 // Check to see if our new N1 is in a positive direction with respect to the normalUnitVector.
1080 // Even if the x component is zero, we should still be able to discern using +0.0 and -0.0
1081 if (newN1en != null && ((newN1en.getX() > initialN1en.getX()) != (normalUnitVector.getX() > -0.0))) {
1082 // If not, use a sign-flipped version of the normalUnitVector.
1083 normalUnitVector = new Point2D.Double(-normalUnitVector.getX(), -normalUnitVector.getY());
1084 }
1085
1086 //HACK: swap Y, because the target pixels are top down, but EastNorth is bottom-up.
1087 //This is normally done by MapView.getPoint, but it does not work on vectors.
1088 normalUnitVector.setLocation(normalUnitVector.getX(), -normalUnitVector.getY());
1089 return normalUnitVector;
1090 }
1091
1092 /**
1093 * Returns true if from1-to1 and from2-to2 vertors directions are opposite
1094 */
1095 private boolean isOppositeDirection(EastNorth from1, EastNorth to1, EastNorth from2, EastNorth to2) {
1096 return (from1.getX()-to1.getX())*(from2.getX()-to2.getX())
1097 +(from1.getY()-to1.getY())*(from2.getY()-to2.getY()) < 0;
1098 }
1099
1100 /**
1101 * Draws right angle symbol at specified position.
1102 * @param g2 the Graphics2D object used to draw on
1103 * @param center center point of angle
1104 * @param normal vector of normal
1105 * @param mirror {@code true} if symbol should be mirrored by the normal
1106 */
1107 private void drawAngleSymbol(Graphics2D g2, Point2D center, Point2D normal, boolean mirror) {
1108 // EastNorth units per pixel
1109 double factor = 1.0/g2.getTransform().getScaleX();
1110 double raoffsetx = symbolSize*factor*normal.getX();
1111 double raoffsety = symbolSize*factor*normal.getY();
1112
1113 double cx = center.getX(), cy = center.getY();
1114 double k = (mirror ? -1 : 1);
1115 Point2D ra1 = new Point2D.Double(cx + raoffsetx, cy + raoffsety);
1116 Point2D ra3 = new Point2D.Double(cx - raoffsety*k, cy + raoffsetx*k);
1117 Point2D ra2 = new Point2D.Double(ra1.getX() - raoffsety*k, ra1.getY() + raoffsetx*k);
1118
1119 GeneralPath ra = new GeneralPath();
1120 ra.moveTo((float)ra1.getX(), (float)ra1.getY());
1121 ra.lineTo((float)ra2.getX(), (float)ra2.getY());
1122 ra.lineTo((float)ra3.getX(), (float)ra3.getY());
1123 g2.setStroke(helperStrokeRA);
1124 g2.draw(ra);
1125 }
1126
1127 /**
1128 * Draws given reference segment.
1129 * @param g2 the Graphics2D object used to draw on
1130 * @param mv
1131 * @param p1en segment's first point
1132 * @param p2en segment's second point
1133 */
1134 private void drawReferenceSegment(Graphics2D g2, MapView mv, ReferenceSegment seg)
1135 {
1136 Point p1 = mv.getPoint(seg.p1);
1137 Point p2 = mv.getPoint(seg.p2);
1138 GeneralPath b = new GeneralPath();
1139 b.moveTo(p1.x, p1.y);
1140 b.lineTo(p2.x, p2.y);
1141 g2.setColor(helperColor);
1142 g2.setStroke(helperStrokeDash);
1143 g2.draw(b);
1144 }
1145
1146 /**
1147 * Creates a new Line that extends off the edge of the viewport in one direction
1148 * @param start The start point of the line
1149 * @param unitvector A unit vector denoting the direction of the line
1150 * @param g the Graphics2D object it will be used on
1151 * @return created line
1152 */
1153 private static Line2D createSemiInfiniteLine(Point2D start, Point2D unitvector, Graphics2D g) {
1154 Rectangle bounds = g.getDeviceConfiguration().getBounds();
1155 try {
1156 AffineTransform invtrans = g.getTransform().createInverse();
1157 Point2D widthpoint = invtrans.deltaTransform(new Point2D.Double(bounds.width,0), null);
1158 Point2D heightpoint = invtrans.deltaTransform(new Point2D.Double(0,bounds.height), null);
1159
1160 // Here we should end up with a gross overestimate of the maximum viewport diagonal in what
1161 // Graphics2D calls 'user space'. Essentially a manhattan distance of manhattan distances.
1162 // This can be used as a safe length of line to generate which will always go off-viewport.
1163 double linelength = Math.abs(widthpoint.getX()) + Math.abs(widthpoint.getY()) + Math.abs(heightpoint.getX()) + Math.abs(heightpoint.getY());
1164
1165 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * linelength) , start.getY() + (unitvector.getY() * linelength)));
1166 }
1167 catch (NoninvertibleTransformException e) {
1168 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * 10) , start.getY() + (unitvector.getY() * 10)));
1169 }
1170 }
1171}
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