source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/ExtrudeAction.java@ 9062

Last change on this file since 9062 was 9059, 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;
72 private boolean nodeDragWithoutCtrl;
73
74 private long mouseDownTime;
75 private transient WaySegment selectedSegment;
76 private transient Node selectedNode;
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 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.
177 * Treat {@link #mode} (extrude/translate/create_new) as dual aligned. */
178 private boolean dualAlignActive;
179 /** Dual alignment reference segments */
180 private transient ReferenceSegment dualAlignSegment1, dualAlignSegment2;
181 /** {@code true}, if new segment was collapsed */
182 private boolean dualAlignSegmentCollapsed;
183 // Dual alignment UI stuff
184 private final DualAlignChangeAction dualAlignChangeAction;
185 private final JCheckBoxMenuItem dualAlignCheckboxMenuItem;
186 private final transient Shortcut dualAlignShortcut;
187 private boolean useRepeatedShortcut;
188 private boolean ignoreNextKeyRelease;
189
190 private class DualAlignChangeAction extends JosmAction {
191 DualAlignChangeAction() {
192 super(tr("Dual alignment"), /* ICON() */ "mapmode/extrude/dualalign",
193 tr("Switch dual alignment mode while extruding"), null, false);
194 putValue("help", ht("/Action/Extrude#DualAlign"));
195 }
196
197 @Override
198 public void actionPerformed(ActionEvent e) {
199 toggleDualAlign();
200 }
201 }
202
203 /**
204 * Creates a new ExtrudeAction
205 * @param mapFrame The MapFrame this action belongs to.
206 */
207 public ExtrudeAction(MapFrame mapFrame) {
208 super(tr("Extrude"), /* ICON(mapmode/) */ "extrude/extrude", tr("Create areas"),
209 Shortcut.registerShortcut("mapmode:extrude", tr("Mode: {0}", tr("Extrude")), KeyEvent.VK_X, Shortcut.DIRECT),
210 mapFrame,
211 ImageProvider.getCursor("normal", "rectangle"));
212 putValue("help", ht("/Action/Extrude"));
213 cursorCreateNew = ImageProvider.getCursor("normal", "rectangle_plus");
214 cursorTranslate = ImageProvider.getCursor("normal", "rectangle_move");
215 cursorCreateNodes = ImageProvider.getCursor("normal", "rectangle_plussmall");
216
217 dualAlignEnabled = false;
218 dualAlignChangeAction = new DualAlignChangeAction();
219 dualAlignCheckboxMenuItem = addDualAlignMenuItem();
220 dualAlignCheckboxMenuItem.getAction().setEnabled(false);
221 dualAlignCheckboxMenuItem.setState(dualAlignEnabled);
222 dualAlignShortcut = Shortcut.registerShortcut("mapmode:extrudedualalign",
223 tr("Mode: {0}", tr("Extrude Dual alignment")), KeyEvent.CHAR_UNDEFINED, Shortcut.NONE);
224 readPreferences(); // to show prefernces in table before entering the mode
225 }
226
227 @Override
228 public void destroy() {
229 super.destroy();
230 dualAlignChangeAction.destroy();
231 }
232
233 private JCheckBoxMenuItem addDualAlignMenuItem() {
234 int n = Main.main.menu.editMenu.getItemCount();
235 for (int i = n-1; i > 0; i--) {
236 JMenuItem item = Main.main.menu.editMenu.getItem(i);
237 if (item != null && item.getAction() != null && item.getAction() instanceof DualAlignChangeAction) {
238 Main.main.menu.editMenu.remove(i);
239 }
240 }
241 return MainMenu.addWithCheckbox(Main.main.menu.editMenu, dualAlignChangeAction, MainMenu.WINDOW_MENU_GROUP.VOLATILE);
242 }
243
244 // -------------------------------------------------------------------------
245 // Mode methods
246 // -------------------------------------------------------------------------
247
248 @Override
249 public String getModeHelpText() {
250 StringBuilder rv;
251 if (mode == Mode.select) {
252 rv = new StringBuilder(tr("Drag a way segment to make a rectangle. Ctrl-drag to move a segment along its normal, " +
253 "Alt-drag to create a new rectangle, double click to add a new node."));
254 if (dualAlignEnabled) {
255 rv.append(' ').append(tr("Dual alignment active."));
256 if (dualAlignSegmentCollapsed)
257 rv.append(' ').append(tr("Segment collapsed due to its direction reversing."));
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 if (dualAlignSegmentCollapsed) {
275 rv.append(' ').append(tr("Segment collapsed due to its direction reversing."));
276 }
277 }
278 }
279 return rv.toString();
280 }
281
282 @Override
283 public boolean layerIsSupported(Layer l) {
284 return l instanceof OsmDataLayer;
285 }
286
287 @Override
288 public void enterMode() {
289 super.enterMode();
290 Main.map.mapView.addMouseListener(this);
291 Main.map.mapView.addMouseMotionListener(this);
292 readPreferences();
293 ignoreNextKeyRelease = true;
294 Main.map.keyDetector.addKeyListener(this);
295 Main.map.keyDetector.addModifierListener(this);
296 }
297
298 private void readPreferences() {
299 initialMoveDelay = Main.pref.getInteger("edit.initial-move-delay", 200);
300 initialMoveThreshold = Main.pref.getInteger("extrude.initial-move-threshold", 1);
301 mainColor = Main.pref.getColor(marktr("Extrude: main line"), null);
302 if (mainColor == null) mainColor = PaintColors.SELECTED.get();
303 helperColor = Main.pref.getColor(marktr("Extrude: helper line"), Color.ORANGE);
304 helperStrokeDash = GuiHelper.getCustomizedStroke(Main.pref.get("extrude.stroke.helper-line", "1 4"));
305 helperStrokeRA = new BasicStroke(1);
306 symbolSize = Main.pref.getDouble("extrude.angle-symbol-radius", 8);
307 nodeDragWithoutCtrl = Main.pref.getBoolean("extrude.drag-nodes-without-ctrl", false);
308 oldLineStroke = GuiHelper.getCustomizedStroke(Main.pref.get("extrude.ctrl.stroke.old-line", "1"));
309 mainStroke = GuiHelper.getCustomizedStroke(Main.pref.get("extrude.stroke.main", "3"));
310
311 ignoreSharedNodes = Main.pref.getBoolean("extrude.ignore-shared-nodes", true);
312 dualAlignCheckboxMenuItem.getAction().setEnabled(true);
313 useRepeatedShortcut = Main.pref.getBoolean("extrude.dualalign.toggleOnRepeatedX", true);
314 keepSegmentDirection = Main.pref.getBoolean("extrude.dualalign.keep-segment-direction", true);
315 }
316
317 @Override
318 public void exitMode() {
319 Main.map.mapView.removeMouseListener(this);
320 Main.map.mapView.removeMouseMotionListener(this);
321 Main.map.mapView.removeTemporaryLayer(this);
322 dualAlignCheckboxMenuItem.getAction().setEnabled(false);
323 Main.map.keyDetector.removeKeyListener(this);
324 Main.map.keyDetector.removeModifierListener(this);
325 super.exitMode();
326 }
327
328 // -------------------------------------------------------------------------
329 // Event handlers
330 // -------------------------------------------------------------------------
331
332 /**
333 * This method is called to indicate different modes via cursor when the Alt/Ctrl/Shift modifier is pressed,
334 */
335 @Override
336 public void modifiersChanged(int modifiers) {
337 if (!Main.isDisplayingMapView() || !Main.map.mapView.isActiveLayerDrawable())
338 return;
339 updateKeyModifiers(modifiers);
340 if (mode == Mode.select) {
341 Main.map.mapView.setNewCursor(ctrl ? cursorTranslate : alt ? cursorCreateNew : shift ? cursorCreateNodes : cursor, this);
342 }
343 }
344
345 @Override
346 public void doKeyPressed(KeyEvent e) {
347 }
348
349 @Override
350 public void doKeyReleased(KeyEvent e) {
351 if (!dualAlignShortcut.isEvent(e) && !(useRepeatedShortcut && getShortcut().isEvent(e)))
352 return;
353 if (ignoreNextKeyRelease) {
354 ignoreNextKeyRelease = false;
355 } else {
356 toggleDualAlign();
357 }
358 }
359
360 /**
361 * Toggles dual alignment mode.
362 */
363 private void toggleDualAlign() {
364 dualAlignEnabled = !dualAlignEnabled;
365 dualAlignCheckboxMenuItem.setState(dualAlignEnabled);
366 updateStatusLine();
367 }
368
369 /**
370 * If the left mouse button is pressed over a segment or a node, switches
371 * to appropriate {@link #mode}, depending on Ctrl/Alt/Shift modifiers and
372 * {@link #dualAlignEnabled}.
373 * @param e current mouse event
374 */
375 @Override
376 public void mousePressed(MouseEvent e) {
377 if (!Main.map.mapView.isActiveLayerVisible())
378 return;
379 if (!(Boolean) this.getValue("active"))
380 return;
381 if (e.getButton() != MouseEvent.BUTTON1)
382 return;
383
384 requestFocusInMapView();
385 updateKeyModifiers(e);
386
387 selectedNode = Main.map.mapView.getNearestNode(e.getPoint(), OsmPrimitive.isSelectablePredicate);
388 selectedSegment = Main.map.mapView.getNearestWaySegment(e.getPoint(), OsmPrimitive.isSelectablePredicate);
389
390 // If nothing gets caught, stay in select mode
391 if (selectedSegment == null && selectedNode == null) return;
392
393 if (selectedNode != null) {
394 if (ctrl || nodeDragWithoutCtrl) {
395 movingNodeList = new ArrayList<>();
396 movingNodeList.add(selectedNode);
397 calculatePossibleDirectionsByNode();
398 if (possibleMoveDirections.isEmpty()) {
399 // if no directions fould, do not enter dragging mode
400 return;
401 }
402 mode = Mode.translate_node;
403 dualAlignActive = false;
404 }
405 } else {
406 // Otherwise switch to another mode
407 if (dualAlignEnabled && checkDualAlignConditions()) {
408 dualAlignActive = true;
409 calculatePossibleDirectionsForDualAlign();
410 dualAlignSegmentCollapsed = false;
411 } else {
412 dualAlignActive = false;
413 calculatePossibleDirectionsBySegment();
414 }
415 if (ctrl) {
416 mode = Mode.translate;
417 movingNodeList = new ArrayList<>();
418 movingNodeList.add(selectedSegment.getFirstNode());
419 movingNodeList.add(selectedSegment.getSecondNode());
420 } else if (alt) {
421 mode = Mode.create_new;
422 // create a new segment and then select and extrude the new segment
423 getCurrentDataSet().setSelected(selectedSegment.way);
424 alwaysCreateNodes = true;
425 } else {
426 mode = Mode.extrude;
427 getCurrentDataSet().setSelected(selectedSegment.way);
428 alwaysCreateNodes = shift;
429 }
430 }
431
432 // Signifies that nothing has happened yet
433 newN1en = null;
434 newN2en = null;
435 moveCommand = null;
436 moveCommand2 = null;
437
438 Main.map.mapView.addTemporaryLayer(this);
439
440 updateStatusLine();
441 Main.map.mapView.repaint();
442
443 // Make note of time pressed
444 mouseDownTime = System.currentTimeMillis();
445
446 // Make note of mouse position
447 initialMousePos = e.getPoint();
448 }
449
450 /**
451 * Performs action depending on what {@link #mode} we're in.
452 * @param e current mouse event
453 */
454 @Override
455 public void mouseDragged(MouseEvent e) {
456 if (!Main.map.mapView.isActiveLayerVisible())
457 return;
458
459 // do not count anything as a drag if it lasts less than 100 milliseconds.
460 if (System.currentTimeMillis() - mouseDownTime < initialMoveDelay)
461 return;
462
463 if (mode == Mode.select) {
464 // Just sit tight and wait for mouse to be released.
465 } else {
466 //move, create new and extrude mode - move the selected segment
467
468 EastNorth mouseEn = Main.map.mapView.getEastNorth(e.getPoint().x, e.getPoint().y);
469 EastNorth bestMovement = calculateBestMovementAndNewNodes(mouseEn);
470
471 Main.map.mapView.setNewCursor(Cursor.MOVE_CURSOR, this);
472
473 if (dualAlignActive) {
474 if (mode == Mode.extrude || mode == Mode.create_new) {
475 // nothing here
476 } else if (mode == Mode.translate) {
477 EastNorth movement1 = newN1en.subtract(initialN1en);
478 EastNorth movement2 = newN2en.subtract(initialN2en);
479 // move nodes to new position
480 if (moveCommand == null || moveCommand2 == null) {
481 // make a new move commands
482 moveCommand = new MoveCommand(movingNodeList.get(0), movement1.getX(), movement1.getY());
483 moveCommand2 = new MoveCommand(movingNodeList.get(1), movement2.getX(), movement2.getY());
484 Command c = new SequenceCommand(tr("Extrude Way"), moveCommand, moveCommand2);
485 Main.main.undoRedo.add(c);
486 } else {
487 // reuse existing move commands
488 moveCommand.moveAgainTo(movement1.getX(), movement1.getY());
489 moveCommand2.moveAgainTo(movement2.getX(), movement2.getY());
490 }
491 }
492 } else {
493 if (mode == Mode.extrude || mode == Mode.create_new) {
494 //nothing here
495 } else if (mode == Mode.translate_node || mode == Mode.translate) {
496 //move nodes to new position
497 if (moveCommand == null) {
498 //make a new move command
499 moveCommand = new MoveCommand(new ArrayList<OsmPrimitive>(movingNodeList), bestMovement);
500 Main.main.undoRedo.add(moveCommand);
501 } else {
502 //reuse existing move command
503 moveCommand.moveAgainTo(bestMovement.getX(), bestMovement.getY());
504 }
505 }
506 }
507
508 Main.map.mapView.repaint();
509 }
510 }
511
512 /**
513 * Does anything that needs to be done, then switches back to select mode.
514 * @param e current mouse event
515 */
516 @Override
517 public void mouseReleased(MouseEvent e) {
518
519 if (!Main.map.mapView.isActiveLayerVisible())
520 return;
521
522 if (mode == Mode.select) {
523 // Nothing to be done
524 } else {
525 if (mode == Mode.create_new) {
526 if (e.getPoint().distance(initialMousePos) > initialMoveThreshold && newN1en != null) {
527 createNewRectangle();
528 }
529 } else if (mode == Mode.extrude) {
530 if (e.getClickCount() == 2 && e.getPoint().equals(initialMousePos)) {
531 // double click adds a new node
532 addNewNode(e);
533 } else if (e.getPoint().distance(initialMousePos) > initialMoveThreshold && newN1en != null && selectedSegment != null) {
534 // main extrusion commands
535 performExtrusion();
536 }
537 } else if (mode == Mode.translate || mode == Mode.translate_node) {
538 //Commit translate
539 //the move command is already committed in mouseDragged
540 joinNodesIfCollapsed(movingNodeList);
541 }
542
543 updateKeyModifiers(e);
544 // Switch back into select mode
545 Main.map.mapView.setNewCursor(ctrl ? cursorTranslate : alt ? cursorCreateNew : shift ? cursorCreateNodes : cursor, this);
546 Main.map.mapView.removeTemporaryLayer(this);
547 selectedSegment = null;
548 moveCommand = null;
549 mode = Mode.select;
550 dualAlignSegmentCollapsed = false;
551 updateStatusLine();
552 Main.map.mapView.repaint();
553 }
554 }
555
556 // -------------------------------------------------------------------------
557 // Custom methods
558 // -------------------------------------------------------------------------
559
560 /**
561 * Inserts node into nearby segment.
562 * @param e current mouse point
563 */
564 private static void addNewNode(MouseEvent e) {
565 // Should maybe do the same as in DrawAction and fetch all nearby segments?
566 WaySegment ws = Main.map.mapView.getNearestWaySegment(e.getPoint(), OsmPrimitive.isSelectablePredicate);
567 if (ws != null) {
568 Node n = new Node(Main.map.mapView.getLatLon(e.getX(), e.getY()));
569 EastNorth A = ws.getFirstNode().getEastNorth();
570 EastNorth B = ws.getSecondNode().getEastNorth();
571 n.setEastNorth(Geometry.closestPointToSegment(A, B, n.getEastNorth()));
572 Way wnew = new Way(ws.way);
573 wnew.addNode(ws.lowerIndex+1, n);
574 SequenceCommand cmds = new SequenceCommand(tr("Add a new node to an existing way"),
575 new AddCommand(n), new ChangeCommand(ws.way, wnew));
576 Main.main.undoRedo.add(cmds);
577 }
578 }
579
580 /**
581 * Creates a new way that shares segment with selected way.
582 */
583 private void createNewRectangle() {
584 if (selectedSegment == null) return;
585 // crete a new rectangle
586 Collection<Command> cmds = new LinkedList<>();
587 Node third = new Node(newN2en);
588 Node fourth = new Node(newN1en);
589 Way wnew = new Way();
590 wnew.addNode(selectedSegment.getFirstNode());
591 wnew.addNode(selectedSegment.getSecondNode());
592 wnew.addNode(third);
593 if (!dualAlignSegmentCollapsed) {
594 // rectangle can degrade to triangle for dual alignment after collapsing
595 wnew.addNode(fourth);
596 }
597 // ... and close the way
598 wnew.addNode(selectedSegment.getFirstNode());
599 // undo support
600 cmds.add(new AddCommand(third));
601 if (!dualAlignSegmentCollapsed) {
602 cmds.add(new AddCommand(fourth));
603 }
604 cmds.add(new AddCommand(wnew));
605 Command c = new SequenceCommand(tr("Extrude Way"), cmds);
606 Main.main.undoRedo.add(c);
607 getCurrentDataSet().setSelected(wnew);
608 }
609
610 /**
611 * Does actual extrusion of {@link #selectedSegment}.
612 * Uses {@link #initialN1en}, {@link #initialN2en} saved in calculatePossibleDirections* call
613 * Uses {@link #newN1en}, {@link #newN2en} calculated by {@link #calculateBestMovementAndNewNodes}
614 */
615 private void performExtrusion() {
616 // create extrusion
617 Collection<Command> cmds = new LinkedList<>();
618 Way wnew = new Way(selectedSegment.way);
619 boolean wayWasModified = false;
620 boolean wayWasSingleSegment = wnew.getNodesCount() == 2;
621 int insertionPoint = selectedSegment.lowerIndex + 1;
622
623 //find if the new points overlap existing segments (in case of 90 degree angles)
624 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
625 boolean nodeOverlapsSegment = prevNode != null && Geometry.segmentsParallel(initialN1en, prevNode.getEastNorth(), initialN1en, newN1en);
626 // segmentAngleZero marks subset of nodeOverlapsSegment.
627 // nodeOverlapsSegment is true if angle between segments is 0 or PI, segmentAngleZero only if angle is 0
628 boolean segmentAngleZero = prevNode != null && Math.abs(Geometry.getCornerAngle(prevNode.getEastNorth(), initialN1en, newN1en)) < 1e-5;
629 boolean hasOtherWays = hasNodeOtherWays(selectedSegment.getFirstNode(), selectedSegment.way);
630 List<Node> changedNodes = new ArrayList<>();
631 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
632 //move existing node
633 Node n1Old = selectedSegment.getFirstNode();
634 cmds.add(new MoveCommand(n1Old, Main.getProjection().eastNorth2latlon(newN1en)));
635 changedNodes.add(n1Old);
636 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
637 // replace shared node with new one
638 Node n1Old = selectedSegment.getFirstNode();
639 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
640 wnew.addNode(insertionPoint, n1New);
641 wnew.removeNode(n1Old);
642 wayWasModified = true;
643 cmds.add(new AddCommand(n1New));
644 changedNodes.add(n1New);
645 } else {
646 //introduce new node
647 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
648 wnew.addNode(insertionPoint, n1New);
649 wayWasModified = true;
650 insertionPoint++;
651 cmds.add(new AddCommand(n1New));
652 changedNodes.add(n1New);
653 }
654
655 //find if the new points overlap existing segments (in case of 90 degree angles)
656 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
657 nodeOverlapsSegment = nextNode != null && Geometry.segmentsParallel(initialN2en, nextNode.getEastNorth(), initialN2en, newN2en);
658 segmentAngleZero = nextNode != null && Math.abs(Geometry.getCornerAngle(nextNode.getEastNorth(), initialN2en, newN2en)) < 1e-5;
659 hasOtherWays = hasNodeOtherWays(selectedSegment.getSecondNode(), selectedSegment.way);
660
661 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
662 //move existing node
663 Node n2Old = selectedSegment.getSecondNode();
664 cmds.add(new MoveCommand(n2Old, Main.getProjection().eastNorth2latlon(newN2en)));
665 changedNodes.add(n2Old);
666 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
667 // replace shared node with new one
668 Node n2Old = selectedSegment.getSecondNode();
669 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
670 wnew.addNode(insertionPoint, n2New);
671 wnew.removeNode(n2Old);
672 wayWasModified = true;
673 cmds.add(new AddCommand(n2New));
674 changedNodes.add(n2New);
675 } else {
676 //introduce new node
677 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
678 wnew.addNode(insertionPoint, n2New);
679 wayWasModified = true;
680 insertionPoint++;
681 cmds.add(new AddCommand(n2New));
682 changedNodes.add(n2New);
683 }
684
685 //the way was a single segment, close the way
686 if (wayWasSingleSegment) {
687 wnew.addNode(selectedSegment.getFirstNode());
688 wayWasModified = true;
689 }
690 if (wayWasModified) {
691 // we only need to change the way if its node list was really modified
692 cmds.add(new ChangeCommand(selectedSegment.way, wnew));
693 }
694 Command c = new SequenceCommand(tr("Extrude Way"), cmds);
695 Main.main.undoRedo.add(c);
696 joinNodesIfCollapsed(changedNodes);
697 }
698
699 private void joinNodesIfCollapsed(List<Node> changedNodes) {
700 if (!dualAlignActive || newN1en == null || newN2en == null) return;
701 if (newN1en.distance(newN2en) > 1e-6) return;
702 // If the dual alignment moved two nodes to the same point, merge them
703 Node targetNode = MergeNodesAction.selectTargetNode(changedNodes);
704 Node locNode = MergeNodesAction.selectTargetLocationNode(changedNodes);
705 Command mergeCmd = MergeNodesAction.mergeNodes(Main.main.getEditLayer(), changedNodes, targetNode, locNode);
706 if (mergeCmd != null) {
707 Main.main.undoRedo.add(mergeCmd);
708 } else {
709 // undo extruding command itself
710 Main.main.undoRedo.undo();
711 }
712 }
713
714 /**
715 * This method tests if {@code node} has other ways apart from the given one.
716 * @param node node to test
717 * @param myWay way known to contain this node
718 * @return {@code true} if {@code node} belongs only to {@code myWay}, false if there are more ways.
719 */
720 private static boolean hasNodeOtherWays(Node node, Way myWay) {
721 for (OsmPrimitive p : node.getReferrers()) {
722 if (p instanceof Way && p.isUsable() && p != myWay)
723 return true;
724 }
725 return false;
726 }
727
728 /**
729 * Determines best movement from {@link #initialMousePos} to current mouse position,
730 * choosing one of the directions from {@link #possibleMoveDirections}.
731 * @param mouseEn current mouse position
732 * @return movement vector
733 */
734 private EastNorth calculateBestMovement(EastNorth mouseEn) {
735
736 EastNorth initialMouseEn = Main.map.mapView.getEastNorth(initialMousePos.x, initialMousePos.y);
737 EastNorth mouseMovement = mouseEn.subtract(initialMouseEn);
738
739 double bestDistance = Double.POSITIVE_INFINITY;
740 EastNorth bestMovement = null;
741 activeMoveDirection = null;
742
743 //find the best movement direction and vector
744 for (ReferenceSegment direction : possibleMoveDirections) {
745 EastNorth movement = calculateSegmentOffset(initialN1en, initialN2en, direction.en, mouseEn);
746 if (movement == null) {
747 //if direction parallel to segment.
748 continue;
749 }
750
751 double distanceFromMouseMovement = movement.distance(mouseMovement);
752 if (bestDistance > distanceFromMouseMovement) {
753 bestDistance = distanceFromMouseMovement;
754 activeMoveDirection = direction;
755 bestMovement = movement;
756 }
757 }
758 return bestMovement;
759
760
761 }
762
763 /***
764 * This method calculates offset amount by which to move the given segment
765 * perpendicularly for it to be in line with mouse position.
766 * @param segmentP1 segment's first point
767 * @param segmentP2 segment's second point
768 * @param moveDirection direction of movement
769 * @param targetPos mouse position
770 * @return offset amount of P1 and P2.
771 */
772 private static EastNorth calculateSegmentOffset(EastNorth segmentP1, EastNorth segmentP2, EastNorth moveDirection,
773 EastNorth targetPos) {
774 EastNorth intersectionPoint;
775 if (segmentP1.distanceSq(segmentP2) > 1e-7) {
776 intersectionPoint = Geometry.getLineLineIntersection(segmentP1, segmentP2, targetPos, targetPos.add(moveDirection));
777 } else {
778 intersectionPoint = Geometry.closestPointToLine(targetPos, targetPos.add(moveDirection), segmentP1);
779 }
780
781 if (intersectionPoint == null)
782 return null;
783 else
784 //return distance form base to target position
785 return targetPos.subtract(intersectionPoint);
786 }
787
788 /**
789 * Gathers possible move directions - perpendicular to the selected segment
790 * and parallel to neighboring segments.
791 */
792 private void calculatePossibleDirectionsBySegment() {
793 // remember initial positions for segment nodes.
794 initialN1en = selectedSegment.getFirstNode().getEastNorth();
795 initialN2en = selectedSegment.getSecondNode().getEastNorth();
796
797 //add direction perpendicular to the selected segment
798 possibleMoveDirections = new ArrayList<>();
799 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
800 initialN1en.getY() - initialN2en.getY(),
801 initialN2en.getX() - initialN1en.getX()
802 ), initialN1en, initialN2en, true));
803
804
805 //add directions parallel to neighbor segments
806 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
807 if (prevNode != null) {
808 EastNorth en = prevNode.getEastNorth();
809 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
810 initialN1en.getX() - en.getX(),
811 initialN1en.getY() - en.getY()
812 ), initialN1en, en, false));
813 }
814
815 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
816 if (nextNode != null) {
817 EastNorth en = nextNode.getEastNorth();
818 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
819 initialN2en.getX() - en.getX(),
820 initialN2en.getY() - en.getY()
821 ), initialN2en, en, false));
822 }
823 }
824
825 /**
826 * Gathers possible move directions - along all adjacent segments.
827 */
828 private void calculatePossibleDirectionsByNode() {
829 // remember initial positions for segment nodes.
830 initialN1en = selectedNode.getEastNorth();
831 initialN2en = initialN1en;
832 possibleMoveDirections = new ArrayList<>();
833 for (OsmPrimitive p: selectedNode.getReferrers()) {
834 if (p instanceof Way && p.isUsable()) {
835 for (Node neighbor: ((Way) p).getNeighbours(selectedNode)) {
836 EastNorth en = neighbor.getEastNorth();
837 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
838 initialN1en.getX() - en.getX(),
839 initialN1en.getY() - en.getY()
840 ), initialN1en, en, false));
841 }
842 }
843 }
844 }
845
846 /**
847 * Checks dual alignment conditions:
848 * 1. selected segment has both neighboring segments,
849 * 2. selected segment is not parallel with neighboring segments.
850 * @return {@code true} if dual alignment conditions are satisfied
851 */
852 private boolean checkDualAlignConditions() {
853 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
854 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
855 if (prevNode == null || nextNode == null) {
856 return false;
857 }
858
859 EastNorth n1en = selectedSegment.getFirstNode().getEastNorth();
860 EastNorth n2en = selectedSegment.getSecondNode().getEastNorth();
861 if (n1en.distance(prevNode.getEastNorth()) < 1e-4 ||
862 n2en.distance(nextNode.getEastNorth()) < 1e-4) {
863 return false;
864 }
865
866 boolean prevSegmentParallel = Geometry.segmentsParallel(n1en, prevNode.getEastNorth(), n1en, n2en);
867 boolean nextSegmentParallel = Geometry.segmentsParallel(n2en, nextNode.getEastNorth(), n1en, n2en);
868 if (prevSegmentParallel || nextSegmentParallel) {
869 return false;
870 }
871
872 return true;
873 }
874
875 /**
876 * Gathers possible move directions - perpendicular to the selected segment only.
877 * Neighboring segments go to {@link #dualAlignSegment1} and {@link #dualAlignSegment2}.
878 */
879 private void calculatePossibleDirectionsForDualAlign() {
880 // remember initial positions for segment nodes.
881 initialN1en = selectedSegment.getFirstNode().getEastNorth();
882 initialN2en = selectedSegment.getSecondNode().getEastNorth();
883
884 // add direction perpendicular to the selected segment
885 possibleMoveDirections = new ArrayList<ReferenceSegment>();
886 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
887 initialN1en.getY() - initialN2en.getY(),
888 initialN2en.getX() - initialN1en.getX()
889 ), initialN1en, initialN2en, true));
890
891 // set neighboring segments
892 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
893 EastNorth prevNodeEn = prevNode.getEastNorth();
894 dualAlignSegment1 = new ReferenceSegment(new EastNorth(
895 initialN1en.getX() - prevNodeEn.getX(),
896 initialN1en.getY() - prevNodeEn.getY()
897 ), initialN1en, prevNodeEn, false);
898
899 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
900 EastNorth nextNodeEn = nextNode.getEastNorth();
901 dualAlignSegment2 = new ReferenceSegment(new EastNorth(
902 initialN2en.getX() - nextNodeEn.getX(),
903 initialN2en.getY() - nextNodeEn.getY()
904 ), initialN2en, nextNodeEn, false);
905 }
906
907 /**
908 * Calculate newN1en, newN2en best suitable for given mouse coordinates
909 * For dual align, calculates positions of new nodes, aligning them to neighboring segments.
910 * Elsewhere, just adds the vetor returned by calculateBestMovement to {@link #initialN1en}, {@link #initialN2en}.
911 * @return best movement vector
912 */
913 private EastNorth calculateBestMovementAndNewNodes(EastNorth mouseEn) {
914 EastNorth bestMovement = calculateBestMovement(mouseEn);
915 EastNorth n1movedEn = initialN1en.add(bestMovement), n2movedEn;
916
917 // find out the movement distance, in metres
918 double distance = Main.getProjection().eastNorth2latlon(initialN1en).greatCircleDistance(
919 Main.getProjection().eastNorth2latlon(n1movedEn));
920 Main.map.statusLine.setDist(distance);
921 updateStatusLine();
922
923 if (dualAlignActive) {
924 // new positions of selected segment's nodes, without applying dual alignment
925 n1movedEn = initialN1en.add(bestMovement);
926 n2movedEn = initialN2en.add(bestMovement);
927
928 // calculate intersections of parallel shifted segment and the adjacent lines
929 newN1en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment1.p1, dualAlignSegment1.p2);
930 newN2en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment2.p1, dualAlignSegment2.p2);
931 if (newN1en == null || newN2en == null) return bestMovement;
932 if (keepSegmentDirection && isOppositeDirection(newN1en, newN2en, initialN1en, initialN2en)) {
933 EastNorth collapsedSegmentPosition = Geometry.getLineLineIntersection(dualAlignSegment1.p1, dualAlignSegment1.p2,
934 dualAlignSegment2.p1, dualAlignSegment2.p2);
935 newN1en = collapsedSegmentPosition;
936 newN2en = collapsedSegmentPosition;
937 dualAlignSegmentCollapsed = true;
938 } else {
939 dualAlignSegmentCollapsed = false;
940 }
941 } else {
942 newN1en = n1movedEn;
943 newN2en = initialN2en.add(bestMovement);
944 }
945 return bestMovement;
946 }
947
948 /**
949 * Gets a node index from selected way before given index.
950 * @param index index of current node
951 * @return index of previous node or <code>-1</code> if there are no nodes there.
952 */
953 private int getPreviousNodeIndex(int index) {
954 if (index > 0)
955 return index - 1;
956 else if (selectedSegment.way.isClosed())
957 return selectedSegment.way.getNodesCount() - 2;
958 else
959 return -1;
960 }
961
962 /**
963 * Gets a node from selected way before given index.
964 * @param index index of current node
965 * @return previous node or <code>null</code> if there are no nodes there.
966 */
967 private Node getPreviousNode(int index) {
968 int indexPrev = getPreviousNodeIndex(index);
969 if (indexPrev >= 0)
970 return selectedSegment.way.getNode(indexPrev);
971 else
972 return null;
973 }
974
975
976 /**
977 * Gets a node index from selected way after given index.
978 * @param index index of current node
979 * @return index of next node or <code>-1</code> if there are no nodes there.
980 */
981 private int getNextNodeIndex(int index) {
982 int count = selectedSegment.way.getNodesCount();
983 if (index < count - 1)
984 return index + 1;
985 else if (selectedSegment.way.isClosed())
986 return 1;
987 else
988 return -1;
989 }
990
991 /**
992 * Gets a node from selected way after given index.
993 * @param index index of current node
994 * @return next node or <code>null</code> if there are no nodes there.
995 */
996 private Node getNextNode(int index) {
997 int indexNext = getNextNodeIndex(index);
998 if (indexNext >= 0)
999 return selectedSegment.way.getNode(indexNext);
1000 else
1001 return null;
1002 }
1003
1004 // -------------------------------------------------------------------------
1005 // paint methods
1006 // -------------------------------------------------------------------------
1007
1008 @Override
1009 public void paint(Graphics2D g, MapView mv, Bounds box) {
1010 Graphics2D g2 = g;
1011 if (mode == Mode.select) {
1012 // Nothing to do
1013 } else {
1014 if (newN1en != null) {
1015
1016 Point p1 = mv.getPoint(initialN1en);
1017 Point p2 = mv.getPoint(initialN2en);
1018 Point p3 = mv.getPoint(newN1en);
1019 Point p4 = mv.getPoint(newN2en);
1020
1021 Point2D normalUnitVector = getNormalUniVector();
1022
1023 if (mode == Mode.extrude || mode == Mode.create_new) {
1024 g2.setColor(mainColor);
1025 g2.setStroke(mainStroke);
1026 // Draw rectangle around new area.
1027 GeneralPath b = new GeneralPath();
1028 b.moveTo(p1.x, p1.y); b.lineTo(p3.x, p3.y);
1029 b.lineTo(p4.x, p4.y); b.lineTo(p2.x, p2.y);
1030 b.lineTo(p1.x, p1.y);
1031 g2.draw(b);
1032
1033 if (dualAlignActive) {
1034 // Draw reference ways
1035 drawReferenceSegment(g2, mv, dualAlignSegment1);
1036 drawReferenceSegment(g2, mv, dualAlignSegment2);
1037 } else if (activeMoveDirection != null) {
1038 // Draw reference way
1039 drawReferenceSegment(g2, mv, activeMoveDirection);
1040
1041 // Draw right angle marker on first node position, only when moving at right angle
1042 if (activeMoveDirection.perpendicular) {
1043 // mirror RightAngle marker, so it is inside the extrude
1044 double headingRefWS = activeMoveDirection.p1.heading(activeMoveDirection.p2);
1045 double headingMoveDir = Math.atan2(normalUnitVector.getY(), normalUnitVector.getX());
1046 double headingDiff = headingRefWS - headingMoveDir;
1047 if (headingDiff < 0) headingDiff += 2 * Math.PI;
1048 boolean mirrorRA = Math.abs(headingDiff - Math.PI) > 1e-5;
1049 Point pr1 = mv.getPoint(activeMoveDirection.p1);
1050 drawAngleSymbol(g2, pr1, normalUnitVector, mirrorRA);
1051 }
1052 }
1053 } else if (mode == Mode.translate || mode == Mode.translate_node) {
1054 g2.setColor(mainColor);
1055 if (p1.distance(p2) < 3) {
1056 g2.setStroke(mainStroke);
1057 g2.drawOval((int) (p1.x-symbolSize/2), (int) (p1.y-symbolSize/2),
1058 (int) (symbolSize), (int) (symbolSize));
1059 } else {
1060 Line2D oldline = new Line2D.Double(p1, p2);
1061 g2.setStroke(oldLineStroke);
1062 g2.draw(oldline);
1063 }
1064
1065 if (dualAlignActive) {
1066 // Draw reference ways
1067 drawReferenceSegment(g2, mv, dualAlignSegment1);
1068 drawReferenceSegment(g2, mv, dualAlignSegment2);
1069 } else if (activeMoveDirection != null) {
1070
1071 g2.setColor(helperColor);
1072 g2.setStroke(helperStrokeDash);
1073 // Draw a guideline along the normal.
1074 Line2D normline;
1075 Point2D centerpoint = new Point2D.Double((p1.getX()+p2.getX())*0.5, (p1.getY()+p2.getY())*0.5);
1076 normline = createSemiInfiniteLine(centerpoint, normalUnitVector, g2);
1077 g2.draw(normline);
1078 // Draw right angle marker on initial position, only when moving at right angle
1079 if (activeMoveDirection.perpendicular) {
1080 // EastNorth units per pixel
1081 g2.setStroke(helperStrokeRA);
1082 g2.setColor(mainColor);
1083 drawAngleSymbol(g2, centerpoint, normalUnitVector, false);
1084 }
1085 }
1086 }
1087 }
1088 g2.setStroke(helperStrokeRA); // restore default stroke to prevent starnge occasional drawings
1089 }
1090 }
1091
1092 private Point2D getNormalUniVector() {
1093 double fac = 1.0 / activeMoveDirection.en.length();
1094 // mult by factor to get unit vector.
1095 Point2D normalUnitVector = new Point2D.Double(activeMoveDirection.en.getX() * fac, activeMoveDirection.en.getY() * fac);
1096
1097 // Check to see if our new N1 is in a positive direction with respect to the normalUnitVector.
1098 // Even if the x component is zero, we should still be able to discern using +0.0 and -0.0
1099 if (newN1en != null && ((newN1en.getX() > initialN1en.getX()) != (normalUnitVector.getX() > -0.0))) {
1100 // If not, use a sign-flipped version of the normalUnitVector.
1101 normalUnitVector = new Point2D.Double(-normalUnitVector.getX(), -normalUnitVector.getY());
1102 }
1103
1104 //HACK: swap Y, because the target pixels are top down, but EastNorth is bottom-up.
1105 //This is normally done by MapView.getPoint, but it does not work on vectors.
1106 normalUnitVector.setLocation(normalUnitVector.getX(), -normalUnitVector.getY());
1107 return normalUnitVector;
1108 }
1109
1110 /**
1111 * Determines if from1-to1 and from2-to2 vertors directions are opposite
1112 * @return true if from1-to1 and from2-to2 vertors directions are opposite
1113 */
1114 private static boolean isOppositeDirection(EastNorth from1, EastNorth to1, EastNorth from2, EastNorth to2) {
1115 return (from1.getX()-to1.getX())*(from2.getX()-to2.getX())
1116 +(from1.getY()-to1.getY())*(from2.getY()-to2.getY()) < 0;
1117 }
1118
1119 /**
1120 * Draws right angle symbol at specified position.
1121 * @param g2 the Graphics2D object used to draw on
1122 * @param center center point of angle
1123 * @param normal vector of normal
1124 * @param mirror {@code true} if symbol should be mirrored by the normal
1125 */
1126 private void drawAngleSymbol(Graphics2D g2, Point2D center, Point2D normal, boolean mirror) {
1127 // EastNorth units per pixel
1128 double factor = 1.0/g2.getTransform().getScaleX();
1129 double raoffsetx = symbolSize*factor*normal.getX();
1130 double raoffsety = symbolSize*factor*normal.getY();
1131
1132 double cx = center.getX(), cy = center.getY();
1133 double k = mirror ? -1 : 1;
1134 Point2D ra1 = new Point2D.Double(cx + raoffsetx, cy + raoffsety);
1135 Point2D ra3 = new Point2D.Double(cx - raoffsety*k, cy + raoffsetx*k);
1136 Point2D ra2 = new Point2D.Double(ra1.getX() - raoffsety*k, ra1.getY() + raoffsetx*k);
1137
1138 GeneralPath ra = new GeneralPath();
1139 ra.moveTo((float) ra1.getX(), (float) ra1.getY());
1140 ra.lineTo((float) ra2.getX(), (float) ra2.getY());
1141 ra.lineTo((float) ra3.getX(), (float) ra3.getY());
1142 g2.setStroke(helperStrokeRA);
1143 g2.draw(ra);
1144 }
1145
1146 /**
1147 * Draws given reference segment.
1148 * @param g2 the Graphics2D object used to draw on
1149 * @param mv map view
1150 * @param seg the reference segment
1151 */
1152 private void drawReferenceSegment(Graphics2D g2, MapView mv, ReferenceSegment seg) {
1153 Point p1 = mv.getPoint(seg.p1);
1154 Point p2 = mv.getPoint(seg.p2);
1155 GeneralPath b = new GeneralPath();
1156 b.moveTo(p1.x, p1.y);
1157 b.lineTo(p2.x, p2.y);
1158 g2.setColor(helperColor);
1159 g2.setStroke(helperStrokeDash);
1160 g2.draw(b);
1161 }
1162
1163 /**
1164 * Creates a new Line that extends off the edge of the viewport in one direction
1165 * @param start The start point of the line
1166 * @param unitvector A unit vector denoting the direction of the line
1167 * @param g the Graphics2D object it will be used on
1168 * @return created line
1169 */
1170 private static Line2D createSemiInfiniteLine(Point2D start, Point2D unitvector, Graphics2D g) {
1171 Rectangle bounds = g.getDeviceConfiguration().getBounds();
1172 try {
1173 AffineTransform invtrans = g.getTransform().createInverse();
1174 Point2D widthpoint = invtrans.deltaTransform(new Point2D.Double(bounds.width, 0), null);
1175 Point2D heightpoint = invtrans.deltaTransform(new Point2D.Double(0, bounds.height), null);
1176
1177 // Here we should end up with a gross overestimate of the maximum viewport diagonal in what
1178 // Graphics2D calls 'user space'. Essentially a manhattan distance of manhattan distances.
1179 // This can be used as a safe length of line to generate which will always go off-viewport.
1180 double linelength = Math.abs(widthpoint.getX()) + Math.abs(widthpoint.getY())
1181 + Math.abs(heightpoint.getX()) + Math.abs(heightpoint.getY());
1182
1183 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * linelength), start.getY()
1184 + (unitvector.getY() * linelength)));
1185 } catch (NoninvertibleTransformException e) {
1186 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * 10), start.getY()
1187 + (unitvector.getY() * 10)));
1188 }
1189 }
1190}
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