source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/ExtrudeAction.java@ 8324

Last change on this file since 8324 was 8308, checked in by Don-vip, 9 years ago

fix potential NPEs and Sonar issues related to serialization
  • Property svn:eol-style set to native
File size: 49.9 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;
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 ArrayList<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 }
532 else if (e.getPoint().distance(initialMousePos) > initialMoveThreshold && newN1en != null && selectedSegment != null) {
533 // main extrusion commands
534 performExtrusion();
535 }
536 } else if (mode == Mode.translate || mode == Mode.translate_node) {
537 //Commit translate
538 //the move command is already committed in mouseDragged
539 joinNodesIfCollapsed(movingNodeList);
540 }
541
542 updateKeyModifiers(e);
543 // Switch back into select mode
544 Main.map.mapView.setNewCursor(ctrl ? cursorTranslate : alt ? cursorCreateNew : shift ? cursorCreateNodes : cursor, this);
545 Main.map.mapView.removeTemporaryLayer(this);
546 selectedSegment = null;
547 moveCommand = null;
548 mode = Mode.select;
549 dualAlignSegmentCollapsed = false;
550 updateStatusLine();
551 Main.map.mapView.repaint();
552 }
553 }
554
555 // -------------------------------------------------------------------------
556 // Custom methods
557 // -------------------------------------------------------------------------
558
559 /**
560 * Inserts node into nearby segment.
561 * @param e current mouse point
562 */
563 private void addNewNode(MouseEvent e) {
564 // Should maybe do the same as in DrawAction and fetch all nearby segments?
565 WaySegment ws = Main.map.mapView.getNearestWaySegment(e.getPoint(), OsmPrimitive.isSelectablePredicate);
566 if (ws != null) {
567 Node n = new Node(Main.map.mapView.getLatLon(e.getX(), e.getY()));
568 EastNorth A = ws.getFirstNode().getEastNorth();
569 EastNorth B = ws.getSecondNode().getEastNorth();
570 n.setEastNorth(Geometry.closestPointToSegment(A, B, n.getEastNorth()));
571 Way wnew = new Way(ws.way);
572 wnew.addNode(ws.lowerIndex+1, n);
573 SequenceCommand cmds = new SequenceCommand(tr("Add a new node to an existing way"),
574 new AddCommand(n), new ChangeCommand(ws.way, wnew));
575 Main.main.undoRedo.add(cmds);
576 }
577 }
578
579 /**
580 * Creates a new way that shares segment with selected way.
581 */
582 private void createNewRectangle() {
583 if (selectedSegment == null) return;
584 // crete a new rectangle
585 Collection<Command> cmds = new LinkedList<>();
586 Node third = new Node(newN2en);
587 Node fourth = new Node(newN1en);
588 Way wnew = new Way();
589 wnew.addNode(selectedSegment.getFirstNode());
590 wnew.addNode(selectedSegment.getSecondNode());
591 wnew.addNode(third);
592 if (!dualAlignSegmentCollapsed) {
593 // rectangle can degrade to triangle for dual alignment after collapsing
594 wnew.addNode(fourth);
595 }
596 // ... and close the way
597 wnew.addNode(selectedSegment.getFirstNode());
598 // undo support
599 cmds.add(new AddCommand(third));
600 if (!dualAlignSegmentCollapsed) {
601 cmds.add(new AddCommand(fourth));
602 }
603 cmds.add(new AddCommand(wnew));
604 Command c = new SequenceCommand(tr("Extrude Way"), cmds);
605 Main.main.undoRedo.add(c);
606 getCurrentDataSet().setSelected(wnew);
607 }
608
609 /**
610 * Does actual extrusion of {@link #selectedSegment}.
611 * Uses {@link #initialN1en}, {@link #initialN2en} saved in calculatePossibleDirections* call
612 * Uses {@link #newN1en}, {@link #newN2en} calculated by {@link #calculateBestMovementAndNewNodes}
613 */
614 private void performExtrusion() {
615 // create extrusion
616 Collection<Command> cmds = new LinkedList<>();
617 Way wnew = new Way(selectedSegment.way);
618 boolean wayWasModified = false;
619 boolean wayWasSingleSegment = wnew.getNodesCount() == 2;
620 int insertionPoint = selectedSegment.lowerIndex + 1;
621
622 //find if the new points overlap existing segments (in case of 90 degree angles)
623 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
624 boolean nodeOverlapsSegment = prevNode != null && Geometry.segmentsParallel(initialN1en, prevNode.getEastNorth(), initialN1en, newN1en);
625 // segmentAngleZero marks subset of nodeOverlapsSegment. nodeOverlapsSegment is true if angle between segments is 0 or PI, segmentAngleZero only if angle is 0
626 boolean segmentAngleZero = prevNode != null && Math.abs(Geometry.getCornerAngle(prevNode.getEastNorth(), initialN1en, newN1en)) < 1e-5;
627 boolean hasOtherWays = hasNodeOtherWays(selectedSegment.getFirstNode(), selectedSegment.way);
628 ArrayList<Node> changedNodes = new ArrayList<>();
629 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
630 //move existing node
631 Node n1Old = selectedSegment.getFirstNode();
632 cmds.add(new MoveCommand(n1Old, Main.getProjection().eastNorth2latlon(newN1en)));
633 changedNodes.add(n1Old);
634 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
635 // replace shared node with new one
636 Node n1Old = selectedSegment.getFirstNode();
637 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
638 wnew.addNode(insertionPoint, n1New);
639 wnew.removeNode(n1Old);
640 wayWasModified = true;
641 cmds.add(new AddCommand(n1New));
642 changedNodes.add(n1New);
643 } else {
644 //introduce new node
645 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
646 wnew.addNode(insertionPoint, n1New);
647 wayWasModified = true;
648 insertionPoint ++;
649 cmds.add(new AddCommand(n1New));
650 changedNodes.add(n1New);
651 }
652
653 //find if the new points overlap existing segments (in case of 90 degree angles)
654 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
655 nodeOverlapsSegment = nextNode != null && Geometry.segmentsParallel(initialN2en, nextNode.getEastNorth(), initialN2en, newN2en);
656 segmentAngleZero = nextNode != null && Math.abs(Geometry.getCornerAngle(nextNode.getEastNorth(), initialN2en, newN2en)) < 1e-5;
657 hasOtherWays = hasNodeOtherWays(selectedSegment.getSecondNode(), selectedSegment.way);
658
659 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
660 //move existing node
661 Node n2Old = selectedSegment.getSecondNode();
662 cmds.add(new MoveCommand(n2Old, Main.getProjection().eastNorth2latlon(newN2en)));
663 changedNodes.add(n2Old);
664 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
665 // replace shared node with new one
666 Node n2Old = selectedSegment.getSecondNode();
667 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
668 wnew.addNode(insertionPoint, n2New);
669 wnew.removeNode(n2Old);
670 wayWasModified = true;
671 cmds.add(new AddCommand(n2New));
672 changedNodes.add(n2New);
673 } else {
674 //introduce new node
675 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
676 wnew.addNode(insertionPoint, n2New);
677 wayWasModified = true;
678 insertionPoint ++;
679 cmds.add(new AddCommand(n2New));
680 changedNodes.add(n2New);
681 }
682
683 //the way was a single segment, close the way
684 if (wayWasSingleSegment) {
685 wnew.addNode(selectedSegment.getFirstNode());
686 wayWasModified = true;
687 }
688 if (wayWasModified) {
689 // we only need to change the way if its node list was really modified
690 cmds.add(new ChangeCommand(selectedSegment.way, wnew));
691 }
692 Command c = new SequenceCommand(tr("Extrude Way"), cmds);
693 Main.main.undoRedo.add(c);
694 joinNodesIfCollapsed(changedNodes);
695 }
696
697 private void joinNodesIfCollapsed(List<Node> changedNodes) {
698 if (!dualAlignActive || newN1en == null || newN2en == null) return;
699 if (newN1en.distance(newN2en) > 1e-6) return;
700 // If the dual alignment moved two nodes to the same point, merge them
701 Node targetNode = MergeNodesAction.selectTargetNode(changedNodes);
702 Node locNode = MergeNodesAction.selectTargetLocationNode(changedNodes);
703 Command mergeCmd = MergeNodesAction.mergeNodes(Main.main.getEditLayer(), changedNodes, targetNode, locNode);
704 if (mergeCmd!=null) {
705 Main.main.undoRedo.add(mergeCmd);
706 } else {
707 // undo extruding command itself
708 Main.main.undoRedo.undo();
709 }
710 }
711
712 /**
713 * This method tests if {@code node} has other ways apart from the given one.
714 * @param node
715 * @param myWay
716 * @return {@code true} if {@code node} belongs only to {@code myWay}, false if there are more ways.
717 */
718 private static boolean hasNodeOtherWays(Node node, Way myWay) {
719 for (OsmPrimitive p : node.getReferrers()) {
720 if (p instanceof Way && p.isUsable() && p != myWay)
721 return true;
722 }
723 return false;
724 }
725
726 /**
727 * Determines best movement from {@link #initialMousePos} to current mouse position,
728 * choosing one of the directions from {@link #possibleMoveDirections}.
729 * @param mouseEn current mouse position
730 * @return movement vector
731 */
732 private EastNorth calculateBestMovement(EastNorth mouseEn) {
733
734 EastNorth initialMouseEn = Main.map.mapView.getEastNorth(initialMousePos.x, initialMousePos.y);
735 EastNorth mouseMovement = initialMouseEn.sub(mouseEn);
736
737 double bestDistance = Double.POSITIVE_INFINITY;
738 EastNorth bestMovement = null;
739 activeMoveDirection = null;
740
741 //find the best movement direction and vector
742 for (ReferenceSegment direction : possibleMoveDirections) {
743 EastNorth movement = calculateSegmentOffset(initialN1en, initialN2en, direction.en, mouseEn);
744 if (movement == null) {
745 //if direction parallel to segment.
746 continue;
747 }
748
749 double distanceFromMouseMovement = movement.distance(mouseMovement);
750 if (bestDistance > distanceFromMouseMovement) {
751 bestDistance = distanceFromMouseMovement;
752 activeMoveDirection = direction;
753 bestMovement = movement;
754 }
755 }
756 return bestMovement;
757
758
759 }
760
761 /***
762 * This method calculates offset amount by which to move the given segment
763 * perpendicularly for it to be in line with mouse position.
764 * @param segmentP1 segment's first point
765 * @param segmentP2 segment's second point
766 * @param moveDirection direction of movement
767 * @param targetPos mouse position
768 * @return offset amount of P1 and P2.
769 */
770 private static EastNorth calculateSegmentOffset(EastNorth segmentP1, EastNorth segmentP2, EastNorth moveDirection,
771 EastNorth targetPos) {
772 EastNorth intersectionPoint;
773 if (segmentP1.distanceSq(segmentP2)>1e-7) {
774 intersectionPoint = Geometry.getLineLineIntersection(segmentP1, segmentP2, targetPos, targetPos.add(moveDirection));
775 } else {
776 intersectionPoint = Geometry.closestPointToLine(targetPos, targetPos.add(moveDirection), segmentP1);
777 }
778
779 if (intersectionPoint == null)
780 return null;
781 else
782 //return distance form base to target position
783 return intersectionPoint.sub(targetPos);
784 }
785
786 /**
787 * Gathers possible move directions - perpendicular to the selected segment
788 * and parallel to neighboring segments.
789 */
790 private void calculatePossibleDirectionsBySegment() {
791 // remember initial positions for segment nodes.
792 initialN1en = selectedSegment.getFirstNode().getEastNorth();
793 initialN2en = selectedSegment.getSecondNode().getEastNorth();
794
795 //add direction perpendicular to the selected segment
796 possibleMoveDirections = new ArrayList<>();
797 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
798 initialN1en.getY() - initialN2en.getY(),
799 initialN2en.getX() - initialN1en.getX()
800 ), initialN1en, initialN2en, true));
801
802
803 //add directions parallel to neighbor segments
804 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
805 if (prevNode != null) {
806 EastNorth en = prevNode.getEastNorth();
807 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
808 initialN1en.getX() - en.getX(),
809 initialN1en.getY() - en.getY()
810 ), initialN1en, en, false));
811 }
812
813 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
814 if (nextNode != null) {
815 EastNorth en = nextNode.getEastNorth();
816 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
817 initialN2en.getX() - en.getX(),
818 initialN2en.getY() - en.getY()
819 ), initialN2en, en, false));
820 }
821 }
822
823 /**
824 * Gathers possible move directions - along all adjacent segments.
825 */
826 private void calculatePossibleDirectionsByNode() {
827 // remember initial positions for segment nodes.
828 initialN1en = selectedNode.getEastNorth();
829 initialN2en = initialN1en;
830 possibleMoveDirections = new ArrayList<>();
831 for (OsmPrimitive p: selectedNode.getReferrers()) {
832 if (p instanceof Way && p.isUsable()) {
833 for (Node neighbor: ((Way) p).getNeighbours(selectedNode)) {
834 EastNorth en = neighbor.getEastNorth();
835 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
836 initialN1en.getX() - en.getX(),
837 initialN1en.getY() - en.getY()
838 ), initialN1en, en, false));
839 }
840 }
841 }
842 }
843
844 /**
845 * Checks dual alignment conditions:
846 * 1. selected segment has both neighboring segments,
847 * 2. selected segment is not parallel with neighboring segments.
848 * @return {@code true} if dual alignment conditions are satisfied
849 */
850 private boolean checkDualAlignConditions() {
851 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
852 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
853 if (prevNode == null || nextNode == null) {
854 return false;
855 }
856
857 EastNorth n1en = selectedSegment.getFirstNode().getEastNorth();
858 EastNorth n2en = selectedSegment.getSecondNode().getEastNorth();
859 if (n1en.distance(prevNode.getEastNorth())<1e-4 ||
860 n2en.distance(nextNode.getEastNorth())<1e-4 ) {
861 return false;
862 }
863
864 boolean prevSegmentParallel = Geometry.segmentsParallel(n1en, prevNode.getEastNorth(), n1en, n2en);
865 boolean nextSegmentParallel = Geometry.segmentsParallel(n2en, nextNode.getEastNorth(), n1en, n2en);
866 if (prevSegmentParallel || nextSegmentParallel) {
867 return false;
868 }
869
870 return true;
871 }
872
873 /**
874 * Gathers possible move directions - perpendicular to the selected segment only.
875 * Neighboring segments go to {@link #dualAlignSegment1} and {@link #dualAlignSegment2}.
876 */
877 private void calculatePossibleDirectionsForDualAlign() {
878 // remember initial positions for segment nodes.
879 initialN1en = selectedSegment.getFirstNode().getEastNorth();
880 initialN2en = selectedSegment.getSecondNode().getEastNorth();
881
882 // add direction perpendicular to the selected segment
883 possibleMoveDirections = new ArrayList<ReferenceSegment>();
884 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
885 initialN1en.getY() - initialN2en.getY(),
886 initialN2en.getX() - initialN1en.getX()
887 ), initialN1en, initialN2en, true));
888
889 // set neighboring segments
890 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
891 EastNorth prevNodeEn = prevNode.getEastNorth();
892 dualAlignSegment1 = new ReferenceSegment(new EastNorth(
893 initialN1en.getX() - prevNodeEn.getX(),
894 initialN1en.getY() - prevNodeEn.getY()
895 ), initialN1en, prevNodeEn, false);
896
897 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
898 EastNorth nextNodeEn = nextNode.getEastNorth();
899 dualAlignSegment2 = new ReferenceSegment(new EastNorth(
900 initialN2en.getX() - nextNodeEn.getX(),
901 initialN2en.getY() - nextNodeEn.getY()
902 ), initialN2en, nextNodeEn, false);
903 }
904
905 /**
906 * Calculate newN1en, newN2en best suitable for given mouse coordinates
907 * For dual align, calculates positions of new nodes, aligning them to neighboring segments.
908 * Elsewhere, just adds the vetor returned by calculateBestMovement to {@link #initialN1en}, {@link #initialN2en}.
909 * @return best movement vector
910 */
911 private EastNorth calculateBestMovementAndNewNodes(EastNorth mouseEn) {
912 EastNorth bestMovement = calculateBestMovement(mouseEn);
913 EastNorth n1movedEn = initialN1en.add(bestMovement), n2movedEn;
914
915 // find out the movement distance, in metres
916 double distance = Main.getProjection().eastNorth2latlon(initialN1en).greatCircleDistance(Main.getProjection().eastNorth2latlon(n1movedEn));
917 Main.map.statusLine.setDist(distance);
918 updateStatusLine();
919
920 if (dualAlignActive) {
921 // new positions of selected segment's nodes, without applying dual alignment
922 n1movedEn = initialN1en.add(bestMovement);
923 n2movedEn = initialN2en.add(bestMovement);
924
925 // calculate intersections of parallel shifted segment and the adjacent lines
926 newN1en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment1.p1, dualAlignSegment1.p2);
927 newN2en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment2.p1, dualAlignSegment2.p2);
928 if (newN1en == null || newN2en == null) return bestMovement;
929 if (keepSegmentDirection && isOppositeDirection(newN1en, newN2en, initialN1en, initialN2en)) {
930 EastNorth collapsedSegmentPosition = Geometry.getLineLineIntersection(dualAlignSegment1.p1, dualAlignSegment1.p2, dualAlignSegment2.p1, dualAlignSegment2.p2);
931 newN1en = collapsedSegmentPosition;
932 newN2en = collapsedSegmentPosition;
933 dualAlignSegmentCollapsed = true;
934 } else {
935 dualAlignSegmentCollapsed = false;
936 }
937 } else {
938 newN1en = n1movedEn;
939 newN2en = initialN2en.add(bestMovement);
940 }
941 return bestMovement;
942 }
943
944 /**
945 * Gets a node index from selected way before given index.
946 * @param index index of current node
947 * @return index of previous node or <code>-1</code> if there are no nodes there.
948 */
949 private int getPreviousNodeIndex(int index) {
950 if (index > 0)
951 return index - 1;
952 else if (selectedSegment.way.isClosed())
953 return selectedSegment.way.getNodesCount() - 2;
954 else
955 return -1;
956 }
957
958 /**
959 * Gets a node from selected way before given index.
960 * @param index index of current node
961 * @return previous node or <code>null</code> if there are no nodes there.
962 */
963 private Node getPreviousNode(int index) {
964 int indexPrev = getPreviousNodeIndex(index);
965 if (indexPrev >= 0)
966 return selectedSegment.way.getNode(indexPrev);
967 else
968 return null;
969 }
970
971
972 /**
973 * Gets a node index from selected way after given index.
974 * @param index index of current node
975 * @return index of next node or <code>-1</code> if there are no nodes there.
976 */
977 private int getNextNodeIndex(int index) {
978 int count = selectedSegment.way.getNodesCount();
979 if (index < count - 1)
980 return index + 1;
981 else if (selectedSegment.way.isClosed())
982 return 1;
983 else
984 return -1;
985 }
986
987 /**
988 * Gets a node from selected way after given index.
989 * @param index index of current node
990 * @return next node or <code>null</code> if there are no nodes there.
991 */
992 private Node getNextNode(int index) {
993 int indexNext = getNextNodeIndex(index);
994 if (indexNext >= 0)
995 return selectedSegment.way.getNode(indexNext);
996 else
997 return null;
998 }
999
1000 // -------------------------------------------------------------------------
1001 // paint methods
1002 // -------------------------------------------------------------------------
1003
1004 @Override
1005 public void paint(Graphics2D g, MapView mv, Bounds box) {
1006 Graphics2D g2 = g;
1007 if (mode == Mode.select) {
1008 // Nothing to do
1009 } else {
1010 if (newN1en != null) {
1011
1012 Point p1 = mv.getPoint(initialN1en);
1013 Point p2 = mv.getPoint(initialN2en);
1014 Point p3 = mv.getPoint(newN1en);
1015 Point p4 = mv.getPoint(newN2en);
1016
1017 Point2D normalUnitVector = getNormalUniVector();
1018
1019 if (mode == Mode.extrude || mode == Mode.create_new) {
1020 g2.setColor(mainColor);
1021 g2.setStroke(mainStroke);
1022 // Draw rectangle around new area.
1023 GeneralPath b = new GeneralPath();
1024 b.moveTo(p1.x, p1.y); b.lineTo(p3.x, p3.y);
1025 b.lineTo(p4.x, p4.y); b.lineTo(p2.x, p2.y);
1026 b.lineTo(p1.x, p1.y);
1027 g2.draw(b);
1028
1029 if (dualAlignActive) {
1030 // Draw reference ways
1031 drawReferenceSegment(g2, mv, dualAlignSegment1);
1032 drawReferenceSegment(g2, mv, dualAlignSegment2);
1033 } else if (activeMoveDirection != null) {
1034 // Draw reference way
1035 drawReferenceSegment(g2, mv, activeMoveDirection);
1036
1037 // Draw right angle marker on first node position, only when moving at right angle
1038 if (activeMoveDirection.perpendicular) {
1039 // mirror RightAngle marker, so it is inside the extrude
1040 double headingRefWS = activeMoveDirection.p1.heading(activeMoveDirection.p2);
1041 double headingMoveDir = Math.atan2(normalUnitVector.getY(), normalUnitVector.getX());
1042 double headingDiff = headingRefWS - headingMoveDir;
1043 if (headingDiff < 0) headingDiff += 2 * Math.PI;
1044 boolean mirrorRA = Math.abs(headingDiff - Math.PI) > 1e-5;
1045 Point pr1 = mv.getPoint(activeMoveDirection.p1);
1046 drawAngleSymbol(g2, pr1, normalUnitVector, mirrorRA);
1047 }
1048 }
1049 } else if (mode == Mode.translate || mode == Mode.translate_node) {
1050 g2.setColor(mainColor);
1051 if (p1.distance(p2) < 3) {
1052 g2.setStroke(mainStroke);
1053 g2.drawOval((int)(p1.x-symbolSize/2), (int)(p1.y-symbolSize/2),
1054 (int)(symbolSize), (int)(symbolSize));
1055 } else {
1056 Line2D oldline = new Line2D.Double(p1, p2);
1057 g2.setStroke(oldLineStroke);
1058 g2.draw(oldline);
1059 }
1060
1061 if (dualAlignActive) {
1062 // Draw reference ways
1063 drawReferenceSegment(g2, mv, dualAlignSegment1);
1064 drawReferenceSegment(g2, mv, dualAlignSegment2);
1065 } else if (activeMoveDirection != null) {
1066
1067 g2.setColor(helperColor);
1068 g2.setStroke(helperStrokeDash);
1069 // Draw a guideline along the normal.
1070 Line2D normline;
1071 Point2D centerpoint = new Point2D.Double((p1.getX()+p2.getX())*0.5, (p1.getY()+p2.getY())*0.5);
1072 normline = createSemiInfiniteLine(centerpoint, normalUnitVector, g2);
1073 g2.draw(normline);
1074 // Draw right angle marker on initial position, only when moving at right angle
1075 if (activeMoveDirection.perpendicular) {
1076 // EastNorth units per pixel
1077 g2.setStroke(helperStrokeRA);
1078 g2.setColor(mainColor);
1079 drawAngleSymbol(g2, centerpoint, normalUnitVector, false);
1080 }
1081 }
1082 }
1083 }
1084 g2.setStroke(helperStrokeRA); // restore default stroke to prevent starnge occasional drawings
1085 }
1086 }
1087
1088 private Point2D getNormalUniVector() {
1089 double fac = 1.0 / activeMoveDirection.en.length();
1090 // mult by factor to get unit vector.
1091 Point2D normalUnitVector = new Point2D.Double(activeMoveDirection.en.getX() * fac, activeMoveDirection.en.getY() * fac);
1092
1093 // Check to see if our new N1 is in a positive direction with respect to the normalUnitVector.
1094 // Even if the x component is zero, we should still be able to discern using +0.0 and -0.0
1095 if (newN1en != null && ((newN1en.getX() > initialN1en.getX()) != (normalUnitVector.getX() > -0.0))) {
1096 // If not, use a sign-flipped version of the normalUnitVector.
1097 normalUnitVector = new Point2D.Double(-normalUnitVector.getX(), -normalUnitVector.getY());
1098 }
1099
1100 //HACK: swap Y, because the target pixels are top down, but EastNorth is bottom-up.
1101 //This is normally done by MapView.getPoint, but it does not work on vectors.
1102 normalUnitVector.setLocation(normalUnitVector.getX(), -normalUnitVector.getY());
1103 return normalUnitVector;
1104 }
1105
1106 /**
1107 * Returns true if from1-to1 and from2-to2 vertors directions are opposite
1108 */
1109 private boolean isOppositeDirection(EastNorth from1, EastNorth to1, EastNorth from2, EastNorth to2) {
1110 return (from1.getX()-to1.getX())*(from2.getX()-to2.getX())
1111 +(from1.getY()-to1.getY())*(from2.getY()-to2.getY()) < 0;
1112 }
1113
1114 /**
1115 * Draws right angle symbol at specified position.
1116 * @param g2 the Graphics2D object used to draw on
1117 * @param center center point of angle
1118 * @param normal vector of normal
1119 * @param mirror {@code true} if symbol should be mirrored by the normal
1120 */
1121 private void drawAngleSymbol(Graphics2D g2, Point2D center, Point2D normal, boolean mirror) {
1122 // EastNorth units per pixel
1123 double factor = 1.0/g2.getTransform().getScaleX();
1124 double raoffsetx = symbolSize*factor*normal.getX();
1125 double raoffsety = symbolSize*factor*normal.getY();
1126
1127 double cx = center.getX(), cy = center.getY();
1128 double k = (mirror ? -1 : 1);
1129 Point2D ra1 = new Point2D.Double(cx + raoffsetx, cy + raoffsety);
1130 Point2D ra3 = new Point2D.Double(cx - raoffsety*k, cy + raoffsetx*k);
1131 Point2D ra2 = new Point2D.Double(ra1.getX() - raoffsety*k, ra1.getY() + raoffsetx*k);
1132
1133 GeneralPath ra = new GeneralPath();
1134 ra.moveTo((float)ra1.getX(), (float)ra1.getY());
1135 ra.lineTo((float)ra2.getX(), (float)ra2.getY());
1136 ra.lineTo((float)ra3.getX(), (float)ra3.getY());
1137 g2.setStroke(helperStrokeRA);
1138 g2.draw(ra);
1139 }
1140
1141 /**
1142 * Draws given reference segment.
1143 * @param g2 the Graphics2D object used to draw on
1144 * @param mv
1145 * @param seg the reference segment
1146 */
1147 private void drawReferenceSegment(Graphics2D g2, MapView mv, ReferenceSegment seg)
1148 {
1149 Point p1 = mv.getPoint(seg.p1);
1150 Point p2 = mv.getPoint(seg.p2);
1151 GeneralPath b = new GeneralPath();
1152 b.moveTo(p1.x, p1.y);
1153 b.lineTo(p2.x, p2.y);
1154 g2.setColor(helperColor);
1155 g2.setStroke(helperStrokeDash);
1156 g2.draw(b);
1157 }
1158
1159 /**
1160 * Creates a new Line that extends off the edge of the viewport in one direction
1161 * @param start The start point of the line
1162 * @param unitvector A unit vector denoting the direction of the line
1163 * @param g the Graphics2D object it will be used on
1164 * @return created line
1165 */
1166 private static Line2D createSemiInfiniteLine(Point2D start, Point2D unitvector, Graphics2D g) {
1167 Rectangle bounds = g.getDeviceConfiguration().getBounds();
1168 try {
1169 AffineTransform invtrans = g.getTransform().createInverse();
1170 Point2D widthpoint = invtrans.deltaTransform(new Point2D.Double(bounds.width,0), null);
1171 Point2D heightpoint = invtrans.deltaTransform(new Point2D.Double(0,bounds.height), null);
1172
1173 // Here we should end up with a gross overestimate of the maximum viewport diagonal in what
1174 // Graphics2D calls 'user space'. Essentially a manhattan distance of manhattan distances.
1175 // This can be used as a safe length of line to generate which will always go off-viewport.
1176 double linelength = Math.abs(widthpoint.getX()) + Math.abs(widthpoint.getY()) + Math.abs(heightpoint.getX()) + Math.abs(heightpoint.getY());
1177
1178 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * linelength) , start.getY() + (unitvector.getY() * linelength)));
1179 }
1180 catch (NoninvertibleTransformException e) {
1181 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * 10) , start.getY() + (unitvector.getY() * 10)));
1182 }
1183 }
1184}
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