source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/ExtrudeAction.java@ 8870

Last change on this file since 8870 was 8870, checked in by Don-vip, 9 years ago

sonar - squid:S2325 - "private" methods that don't access instance data should be "static"
  • Property svn:eol-style set to native
File size: 50.1 KB
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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 * Toggles dual alignment mode.
361 */
362 private void toggleDualAlign() {
363 dualAlignEnabled = !dualAlignEnabled;
364 dualAlignCheckboxMenuItem.setState(dualAlignEnabled);
365 updateStatusLine();
366 }
367
368 /**
369 * If the left mouse button is pressed over a segment or a node, switches
370 * to appropriate {@link #mode}, depending on Ctrl/Alt/Shift modifiers and
371 * {@link #dualAlignEnabled}.
372 * @param e current mouse event
373 */
374 @Override
375 public void mousePressed(MouseEvent e) {
376 if (!Main.map.mapView.isActiveLayerVisible())
377 return;
378 if (!(Boolean) this.getValue("active"))
379 return;
380 if (e.getButton() != MouseEvent.BUTTON1)
381 return;
382
383 requestFocusInMapView();
384 updateKeyModifiers(e);
385
386 selectedNode = Main.map.mapView.getNearestNode(e.getPoint(), OsmPrimitive.isSelectablePredicate);
387 selectedSegment = Main.map.mapView.getNearestWaySegment(e.getPoint(), OsmPrimitive.isSelectablePredicate);
388
389 // If nothing gets caught, stay in select mode
390 if (selectedSegment == null && selectedNode == null) return;
391
392 if (selectedNode != null) {
393 if (ctrl || nodeDragWithoutCtrl) {
394 movingNodeList = new ArrayList<>();
395 movingNodeList.add(selectedNode);
396 calculatePossibleDirectionsByNode();
397 if (possibleMoveDirections.isEmpty()) {
398 // if no directions fould, do not enter dragging mode
399 return;
400 }
401 mode = Mode.translate_node;
402 dualAlignActive = false;
403 }
404 } else {
405 // Otherwise switch to another mode
406 if (dualAlignEnabled && checkDualAlignConditions()) {
407 dualAlignActive = true;
408 calculatePossibleDirectionsForDualAlign();
409 dualAlignSegmentCollapsed = false;
410 } else {
411 dualAlignActive = false;
412 calculatePossibleDirectionsBySegment();
413 }
414 if (ctrl) {
415 mode = Mode.translate;
416 movingNodeList = new ArrayList<>();
417 movingNodeList.add(selectedSegment.getFirstNode());
418 movingNodeList.add(selectedSegment.getSecondNode());
419 } else if (alt) {
420 mode = Mode.create_new;
421 // create a new segment and then select and extrude the new segment
422 getCurrentDataSet().setSelected(selectedSegment.way);
423 alwaysCreateNodes = true;
424 } else {
425 mode = Mode.extrude;
426 getCurrentDataSet().setSelected(selectedSegment.way);
427 alwaysCreateNodes = shift;
428 }
429 }
430
431 // Signifies that nothing has happened yet
432 newN1en = null;
433 newN2en = null;
434 moveCommand = null;
435 moveCommand2 = null;
436
437 Main.map.mapView.addTemporaryLayer(this);
438
439 updateStatusLine();
440 Main.map.mapView.repaint();
441
442 // Make note of time pressed
443 mouseDownTime = System.currentTimeMillis();
444
445 // Make note of mouse position
446 initialMousePos = e.getPoint();
447 }
448
449 /**
450 * Performs action depending on what {@link #mode} we're in.
451 * @param e current mouse event
452 */
453 @Override
454 public void mouseDragged(MouseEvent e) {
455 if (!Main.map.mapView.isActiveLayerVisible())
456 return;
457
458 // do not count anything as a drag if it lasts less than 100 milliseconds.
459 if (System.currentTimeMillis() - mouseDownTime < initialMoveDelay)
460 return;
461
462 if (mode == Mode.select) {
463 // Just sit tight and wait for mouse to be released.
464 } else {
465 //move, create new and extrude mode - move the selected segment
466
467 EastNorth mouseEn = Main.map.mapView.getEastNorth(e.getPoint().x, e.getPoint().y);
468 EastNorth bestMovement = calculateBestMovementAndNewNodes(mouseEn);
469
470 Main.map.mapView.setNewCursor(Cursor.MOVE_CURSOR, this);
471
472 if (dualAlignActive) {
473 if (mode == Mode.extrude || mode == Mode.create_new) {
474 // nothing here
475 } else if (mode == Mode.translate) {
476 EastNorth movement1 = newN1en.subtract(initialN1en);
477 EastNorth movement2 = newN2en.subtract(initialN2en);
478 // move nodes to new position
479 if (moveCommand == null || moveCommand2 == null) {
480 // make a new move commands
481 moveCommand = new MoveCommand(movingNodeList.get(0), movement1.getX(), movement1.getY());
482 moveCommand2 = new MoveCommand(movingNodeList.get(1), movement2.getX(), movement2.getY());
483 Command c = new SequenceCommand(tr("Extrude Way"), moveCommand, moveCommand2);
484 Main.main.undoRedo.add(c);
485 } else {
486 // reuse existing move commands
487 moveCommand.moveAgainTo(movement1.getX(), movement1.getY());
488 moveCommand2.moveAgainTo(movement2.getX(), movement2.getY());
489 }
490 }
491 } else {
492 if (mode == Mode.extrude || mode == Mode.create_new) {
493 //nothing here
494 } else if (mode == Mode.translate_node || mode == Mode.translate) {
495 //move nodes to new position
496 if (moveCommand == null) {
497 //make a new move command
498 moveCommand = new MoveCommand(new ArrayList<OsmPrimitive>(movingNodeList), bestMovement);
499 Main.main.undoRedo.add(moveCommand);
500 } else {
501 //reuse existing move command
502 moveCommand.moveAgainTo(bestMovement.getX(), bestMovement.getY());
503 }
504 }
505 }
506
507 Main.map.mapView.repaint();
508 }
509 }
510
511 /**
512 * Does anything that needs to be done, then switches back to select mode.
513 * @param e current mouse event
514 */
515 @Override
516 public void mouseReleased(MouseEvent e) {
517
518 if (!Main.map.mapView.isActiveLayerVisible())
519 return;
520
521 if (mode == Mode.select) {
522 // Nothing to be done
523 } else {
524 if (mode == Mode.create_new) {
525 if (e.getPoint().distance(initialMousePos) > initialMoveThreshold && newN1en != null) {
526 createNewRectangle();
527 }
528 } else if (mode == Mode.extrude) {
529 if (e.getClickCount() == 2 && e.getPoint().equals(initialMousePos)) {
530 // double click adds a new node
531 addNewNode(e);
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 static 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.
626 // nodeOverlapsSegment is true if angle between segments is 0 or PI, segmentAngleZero only if angle is 0
627 boolean segmentAngleZero = prevNode != null && Math.abs(Geometry.getCornerAngle(prevNode.getEastNorth(), initialN1en, newN1en)) < 1e-5;
628 boolean hasOtherWays = hasNodeOtherWays(selectedSegment.getFirstNode(), selectedSegment.way);
629 List<Node> changedNodes = new ArrayList<>();
630 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
631 //move existing node
632 Node n1Old = selectedSegment.getFirstNode();
633 cmds.add(new MoveCommand(n1Old, Main.getProjection().eastNorth2latlon(newN1en)));
634 changedNodes.add(n1Old);
635 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
636 // replace shared node with new one
637 Node n1Old = selectedSegment.getFirstNode();
638 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
639 wnew.addNode(insertionPoint, n1New);
640 wnew.removeNode(n1Old);
641 wayWasModified = true;
642 cmds.add(new AddCommand(n1New));
643 changedNodes.add(n1New);
644 } else {
645 //introduce new node
646 Node n1New = new Node(Main.getProjection().eastNorth2latlon(newN1en));
647 wnew.addNode(insertionPoint, n1New);
648 wayWasModified = true;
649 insertionPoint++;
650 cmds.add(new AddCommand(n1New));
651 changedNodes.add(n1New);
652 }
653
654 //find if the new points overlap existing segments (in case of 90 degree angles)
655 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
656 nodeOverlapsSegment = nextNode != null && Geometry.segmentsParallel(initialN2en, nextNode.getEastNorth(), initialN2en, newN2en);
657 segmentAngleZero = nextNode != null && Math.abs(Geometry.getCornerAngle(nextNode.getEastNorth(), initialN2en, newN2en)) < 1e-5;
658 hasOtherWays = hasNodeOtherWays(selectedSegment.getSecondNode(), selectedSegment.way);
659
660 if (nodeOverlapsSegment && !alwaysCreateNodes && !hasOtherWays) {
661 //move existing node
662 Node n2Old = selectedSegment.getSecondNode();
663 cmds.add(new MoveCommand(n2Old, Main.getProjection().eastNorth2latlon(newN2en)));
664 changedNodes.add(n2Old);
665 } else if (ignoreSharedNodes && segmentAngleZero && !alwaysCreateNodes && hasOtherWays) {
666 // replace shared node with new one
667 Node n2Old = selectedSegment.getSecondNode();
668 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
669 wnew.addNode(insertionPoint, n2New);
670 wnew.removeNode(n2Old);
671 wayWasModified = true;
672 cmds.add(new AddCommand(n2New));
673 changedNodes.add(n2New);
674 } else {
675 //introduce new node
676 Node n2New = new Node(Main.getProjection().eastNorth2latlon(newN2en));
677 wnew.addNode(insertionPoint, n2New);
678 wayWasModified = true;
679 insertionPoint++;
680 cmds.add(new AddCommand(n2New));
681 changedNodes.add(n2New);
682 }
683
684 //the way was a single segment, close the way
685 if (wayWasSingleSegment) {
686 wnew.addNode(selectedSegment.getFirstNode());
687 wayWasModified = true;
688 }
689 if (wayWasModified) {
690 // we only need to change the way if its node list was really modified
691 cmds.add(new ChangeCommand(selectedSegment.way, wnew));
692 }
693 Command c = new SequenceCommand(tr("Extrude Way"), cmds);
694 Main.main.undoRedo.add(c);
695 joinNodesIfCollapsed(changedNodes);
696 }
697
698 private void joinNodesIfCollapsed(List<Node> changedNodes) {
699 if (!dualAlignActive || newN1en == null || newN2en == null) return;
700 if (newN1en.distance(newN2en) > 1e-6) return;
701 // If the dual alignment moved two nodes to the same point, merge them
702 Node targetNode = MergeNodesAction.selectTargetNode(changedNodes);
703 Node locNode = MergeNodesAction.selectTargetLocationNode(changedNodes);
704 Command mergeCmd = MergeNodesAction.mergeNodes(Main.main.getEditLayer(), changedNodes, targetNode, locNode);
705 if (mergeCmd != null) {
706 Main.main.undoRedo.add(mergeCmd);
707 } else {
708 // undo extruding command itself
709 Main.main.undoRedo.undo();
710 }
711 }
712
713 /**
714 * This method tests if {@code node} has other ways apart from the given one.
715 * @param node node to test
716 * @param myWay way known to contain this node
717 * @return {@code true} if {@code node} belongs only to {@code myWay}, false if there are more ways.
718 */
719 private static boolean hasNodeOtherWays(Node node, Way myWay) {
720 for (OsmPrimitive p : node.getReferrers()) {
721 if (p instanceof Way && p.isUsable() && p != myWay)
722 return true;
723 }
724 return false;
725 }
726
727 /**
728 * Determines best movement from {@link #initialMousePos} to current mouse position,
729 * choosing one of the directions from {@link #possibleMoveDirections}.
730 * @param mouseEn current mouse position
731 * @return movement vector
732 */
733 private EastNorth calculateBestMovement(EastNorth mouseEn) {
734
735 EastNorth initialMouseEn = Main.map.mapView.getEastNorth(initialMousePos.x, initialMousePos.y);
736 EastNorth mouseMovement = mouseEn.subtract(initialMouseEn);
737
738 double bestDistance = Double.POSITIVE_INFINITY;
739 EastNorth bestMovement = null;
740 activeMoveDirection = null;
741
742 //find the best movement direction and vector
743 for (ReferenceSegment direction : possibleMoveDirections) {
744 EastNorth movement = calculateSegmentOffset(initialN1en, initialN2en, direction.en, mouseEn);
745 if (movement == null) {
746 //if direction parallel to segment.
747 continue;
748 }
749
750 double distanceFromMouseMovement = movement.distance(mouseMovement);
751 if (bestDistance > distanceFromMouseMovement) {
752 bestDistance = distanceFromMouseMovement;
753 activeMoveDirection = direction;
754 bestMovement = movement;
755 }
756 }
757 return bestMovement;
758
759
760 }
761
762 /***
763 * This method calculates offset amount by which to move the given segment
764 * perpendicularly for it to be in line with mouse position.
765 * @param segmentP1 segment's first point
766 * @param segmentP2 segment's second point
767 * @param moveDirection direction of movement
768 * @param targetPos mouse position
769 * @return offset amount of P1 and P2.
770 */
771 private static EastNorth calculateSegmentOffset(EastNorth segmentP1, EastNorth segmentP2, EastNorth moveDirection,
772 EastNorth targetPos) {
773 EastNorth intersectionPoint;
774 if (segmentP1.distanceSq(segmentP2) > 1e-7) {
775 intersectionPoint = Geometry.getLineLineIntersection(segmentP1, segmentP2, targetPos, targetPos.add(moveDirection));
776 } else {
777 intersectionPoint = Geometry.closestPointToLine(targetPos, targetPos.add(moveDirection), segmentP1);
778 }
779
780 if (intersectionPoint == null)
781 return null;
782 else
783 //return distance form base to target position
784 return targetPos.subtract(intersectionPoint);
785 }
786
787 /**
788 * Gathers possible move directions - perpendicular to the selected segment
789 * and parallel to neighboring segments.
790 */
791 private void calculatePossibleDirectionsBySegment() {
792 // remember initial positions for segment nodes.
793 initialN1en = selectedSegment.getFirstNode().getEastNorth();
794 initialN2en = selectedSegment.getSecondNode().getEastNorth();
795
796 //add direction perpendicular to the selected segment
797 possibleMoveDirections = new ArrayList<>();
798 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
799 initialN1en.getY() - initialN2en.getY(),
800 initialN2en.getX() - initialN1en.getX()
801 ), initialN1en, initialN2en, true));
802
803
804 //add directions parallel to neighbor segments
805 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
806 if (prevNode != null) {
807 EastNorth en = prevNode.getEastNorth();
808 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
809 initialN1en.getX() - en.getX(),
810 initialN1en.getY() - en.getY()
811 ), initialN1en, en, false));
812 }
813
814 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
815 if (nextNode != null) {
816 EastNorth en = nextNode.getEastNorth();
817 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
818 initialN2en.getX() - en.getX(),
819 initialN2en.getY() - en.getY()
820 ), initialN2en, en, false));
821 }
822 }
823
824 /**
825 * Gathers possible move directions - along all adjacent segments.
826 */
827 private void calculatePossibleDirectionsByNode() {
828 // remember initial positions for segment nodes.
829 initialN1en = selectedNode.getEastNorth();
830 initialN2en = initialN1en;
831 possibleMoveDirections = new ArrayList<>();
832 for (OsmPrimitive p: selectedNode.getReferrers()) {
833 if (p instanceof Way && p.isUsable()) {
834 for (Node neighbor: ((Way) p).getNeighbours(selectedNode)) {
835 EastNorth en = neighbor.getEastNorth();
836 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
837 initialN1en.getX() - en.getX(),
838 initialN1en.getY() - en.getY()
839 ), initialN1en, en, false));
840 }
841 }
842 }
843 }
844
845 /**
846 * Checks dual alignment conditions:
847 * 1. selected segment has both neighboring segments,
848 * 2. selected segment is not parallel with neighboring segments.
849 * @return {@code true} if dual alignment conditions are satisfied
850 */
851 private boolean checkDualAlignConditions() {
852 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
853 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
854 if (prevNode == null || nextNode == null) {
855 return false;
856 }
857
858 EastNorth n1en = selectedSegment.getFirstNode().getEastNorth();
859 EastNorth n2en = selectedSegment.getSecondNode().getEastNorth();
860 if (n1en.distance(prevNode.getEastNorth()) < 1e-4 ||
861 n2en.distance(nextNode.getEastNorth()) < 1e-4) {
862 return false;
863 }
864
865 boolean prevSegmentParallel = Geometry.segmentsParallel(n1en, prevNode.getEastNorth(), n1en, n2en);
866 boolean nextSegmentParallel = Geometry.segmentsParallel(n2en, nextNode.getEastNorth(), n1en, n2en);
867 if (prevSegmentParallel || nextSegmentParallel) {
868 return false;
869 }
870
871 return true;
872 }
873
874 /**
875 * Gathers possible move directions - perpendicular to the selected segment only.
876 * Neighboring segments go to {@link #dualAlignSegment1} and {@link #dualAlignSegment2}.
877 */
878 private void calculatePossibleDirectionsForDualAlign() {
879 // remember initial positions for segment nodes.
880 initialN1en = selectedSegment.getFirstNode().getEastNorth();
881 initialN2en = selectedSegment.getSecondNode().getEastNorth();
882
883 // add direction perpendicular to the selected segment
884 possibleMoveDirections = new ArrayList<ReferenceSegment>();
885 possibleMoveDirections.add(new ReferenceSegment(new EastNorth(
886 initialN1en.getY() - initialN2en.getY(),
887 initialN2en.getX() - initialN1en.getX()
888 ), initialN1en, initialN2en, true));
889
890 // set neighboring segments
891 Node prevNode = getPreviousNode(selectedSegment.lowerIndex);
892 EastNorth prevNodeEn = prevNode.getEastNorth();
893 dualAlignSegment1 = new ReferenceSegment(new EastNorth(
894 initialN1en.getX() - prevNodeEn.getX(),
895 initialN1en.getY() - prevNodeEn.getY()
896 ), initialN1en, prevNodeEn, false);
897
898 Node nextNode = getNextNode(selectedSegment.lowerIndex + 1);
899 EastNorth nextNodeEn = nextNode.getEastNorth();
900 dualAlignSegment2 = new ReferenceSegment(new EastNorth(
901 initialN2en.getX() - nextNodeEn.getX(),
902 initialN2en.getY() - nextNodeEn.getY()
903 ), initialN2en, nextNodeEn, false);
904 }
905
906 /**
907 * Calculate newN1en, newN2en best suitable for given mouse coordinates
908 * For dual align, calculates positions of new nodes, aligning them to neighboring segments.
909 * Elsewhere, just adds the vetor returned by calculateBestMovement to {@link #initialN1en}, {@link #initialN2en}.
910 * @return best movement vector
911 */
912 private EastNorth calculateBestMovementAndNewNodes(EastNorth mouseEn) {
913 EastNorth bestMovement = calculateBestMovement(mouseEn);
914 EastNorth n1movedEn = initialN1en.add(bestMovement), n2movedEn;
915
916 // find out the movement distance, in metres
917 double distance = Main.getProjection().eastNorth2latlon(initialN1en).greatCircleDistance(
918 Main.getProjection().eastNorth2latlon(n1movedEn));
919 Main.map.statusLine.setDist(distance);
920 updateStatusLine();
921
922 if (dualAlignActive) {
923 // new positions of selected segment's nodes, without applying dual alignment
924 n1movedEn = initialN1en.add(bestMovement);
925 n2movedEn = initialN2en.add(bestMovement);
926
927 // calculate intersections of parallel shifted segment and the adjacent lines
928 newN1en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment1.p1, dualAlignSegment1.p2);
929 newN2en = Geometry.getLineLineIntersection(n1movedEn, n2movedEn, dualAlignSegment2.p1, dualAlignSegment2.p2);
930 if (newN1en == null || newN2en == null) return bestMovement;
931 if (keepSegmentDirection && isOppositeDirection(newN1en, newN2en, initialN1en, initialN2en)) {
932 EastNorth collapsedSegmentPosition = Geometry.getLineLineIntersection(dualAlignSegment1.p1, dualAlignSegment1.p2,
933 dualAlignSegment2.p1, dualAlignSegment2.p2);
934 newN1en = collapsedSegmentPosition;
935 newN2en = collapsedSegmentPosition;
936 dualAlignSegmentCollapsed = true;
937 } else {
938 dualAlignSegmentCollapsed = false;
939 }
940 } else {
941 newN1en = n1movedEn;
942 newN2en = initialN2en.add(bestMovement);
943 }
944 return bestMovement;
945 }
946
947 /**
948 * Gets a node index from selected way before given index.
949 * @param index index of current node
950 * @return index of previous node or <code>-1</code> if there are no nodes there.
951 */
952 private int getPreviousNodeIndex(int index) {
953 if (index > 0)
954 return index - 1;
955 else if (selectedSegment.way.isClosed())
956 return selectedSegment.way.getNodesCount() - 2;
957 else
958 return -1;
959 }
960
961 /**
962 * Gets a node from selected way before given index.
963 * @param index index of current node
964 * @return previous node or <code>null</code> if there are no nodes there.
965 */
966 private Node getPreviousNode(int index) {
967 int indexPrev = getPreviousNodeIndex(index);
968 if (indexPrev >= 0)
969 return selectedSegment.way.getNode(indexPrev);
970 else
971 return null;
972 }
973
974
975 /**
976 * Gets a node index from selected way after given index.
977 * @param index index of current node
978 * @return index of next node or <code>-1</code> if there are no nodes there.
979 */
980 private int getNextNodeIndex(int index) {
981 int count = selectedSegment.way.getNodesCount();
982 if (index < count - 1)
983 return index + 1;
984 else if (selectedSegment.way.isClosed())
985 return 1;
986 else
987 return -1;
988 }
989
990 /**
991 * Gets a node from selected way after given index.
992 * @param index index of current node
993 * @return next node or <code>null</code> if there are no nodes there.
994 */
995 private Node getNextNode(int index) {
996 int indexNext = getNextNodeIndex(index);
997 if (indexNext >= 0)
998 return selectedSegment.way.getNode(indexNext);
999 else
1000 return null;
1001 }
1002
1003 // -------------------------------------------------------------------------
1004 // paint methods
1005 // -------------------------------------------------------------------------
1006
1007 @Override
1008 public void paint(Graphics2D g, MapView mv, Bounds box) {
1009 Graphics2D g2 = g;
1010 if (mode == Mode.select) {
1011 // Nothing to do
1012 } else {
1013 if (newN1en != null) {
1014
1015 Point p1 = mv.getPoint(initialN1en);
1016 Point p2 = mv.getPoint(initialN2en);
1017 Point p3 = mv.getPoint(newN1en);
1018 Point p4 = mv.getPoint(newN2en);
1019
1020 Point2D normalUnitVector = getNormalUniVector();
1021
1022 if (mode == Mode.extrude || mode == Mode.create_new) {
1023 g2.setColor(mainColor);
1024 g2.setStroke(mainStroke);
1025 // Draw rectangle around new area.
1026 GeneralPath b = new GeneralPath();
1027 b.moveTo(p1.x, p1.y); b.lineTo(p3.x, p3.y);
1028 b.lineTo(p4.x, p4.y); b.lineTo(p2.x, p2.y);
1029 b.lineTo(p1.x, p1.y);
1030 g2.draw(b);
1031
1032 if (dualAlignActive) {
1033 // Draw reference ways
1034 drawReferenceSegment(g2, mv, dualAlignSegment1);
1035 drawReferenceSegment(g2, mv, dualAlignSegment2);
1036 } else if (activeMoveDirection != null) {
1037 // Draw reference way
1038 drawReferenceSegment(g2, mv, activeMoveDirection);
1039
1040 // Draw right angle marker on first node position, only when moving at right angle
1041 if (activeMoveDirection.perpendicular) {
1042 // mirror RightAngle marker, so it is inside the extrude
1043 double headingRefWS = activeMoveDirection.p1.heading(activeMoveDirection.p2);
1044 double headingMoveDir = Math.atan2(normalUnitVector.getY(), normalUnitVector.getX());
1045 double headingDiff = headingRefWS - headingMoveDir;
1046 if (headingDiff < 0) headingDiff += 2 * Math.PI;
1047 boolean mirrorRA = Math.abs(headingDiff - Math.PI) > 1e-5;
1048 Point pr1 = mv.getPoint(activeMoveDirection.p1);
1049 drawAngleSymbol(g2, pr1, normalUnitVector, mirrorRA);
1050 }
1051 }
1052 } else if (mode == Mode.translate || mode == Mode.translate_node) {
1053 g2.setColor(mainColor);
1054 if (p1.distance(p2) < 3) {
1055 g2.setStroke(mainStroke);
1056 g2.drawOval((int) (p1.x-symbolSize/2), (int) (p1.y-symbolSize/2),
1057 (int) (symbolSize), (int) (symbolSize));
1058 } else {
1059 Line2D oldline = new Line2D.Double(p1, p2);
1060 g2.setStroke(oldLineStroke);
1061 g2.draw(oldline);
1062 }
1063
1064 if (dualAlignActive) {
1065 // Draw reference ways
1066 drawReferenceSegment(g2, mv, dualAlignSegment1);
1067 drawReferenceSegment(g2, mv, dualAlignSegment2);
1068 } else if (activeMoveDirection != null) {
1069
1070 g2.setColor(helperColor);
1071 g2.setStroke(helperStrokeDash);
1072 // Draw a guideline along the normal.
1073 Line2D normline;
1074 Point2D centerpoint = new Point2D.Double((p1.getX()+p2.getX())*0.5, (p1.getY()+p2.getY())*0.5);
1075 normline = createSemiInfiniteLine(centerpoint, normalUnitVector, g2);
1076 g2.draw(normline);
1077 // Draw right angle marker on initial position, only when moving at right angle
1078 if (activeMoveDirection.perpendicular) {
1079 // EastNorth units per pixel
1080 g2.setStroke(helperStrokeRA);
1081 g2.setColor(mainColor);
1082 drawAngleSymbol(g2, centerpoint, normalUnitVector, false);
1083 }
1084 }
1085 }
1086 }
1087 g2.setStroke(helperStrokeRA); // restore default stroke to prevent starnge occasional drawings
1088 }
1089 }
1090
1091 private Point2D getNormalUniVector() {
1092 double fac = 1.0 / activeMoveDirection.en.length();
1093 // mult by factor to get unit vector.
1094 Point2D normalUnitVector = new Point2D.Double(activeMoveDirection.en.getX() * fac, activeMoveDirection.en.getY() * fac);
1095
1096 // Check to see if our new N1 is in a positive direction with respect to the normalUnitVector.
1097 // Even if the x component is zero, we should still be able to discern using +0.0 and -0.0
1098 if (newN1en != null && ((newN1en.getX() > initialN1en.getX()) != (normalUnitVector.getX() > -0.0))) {
1099 // If not, use a sign-flipped version of the normalUnitVector.
1100 normalUnitVector = new Point2D.Double(-normalUnitVector.getX(), -normalUnitVector.getY());
1101 }
1102
1103 //HACK: swap Y, because the target pixels are top down, but EastNorth is bottom-up.
1104 //This is normally done by MapView.getPoint, but it does not work on vectors.
1105 normalUnitVector.setLocation(normalUnitVector.getX(), -normalUnitVector.getY());
1106 return normalUnitVector;
1107 }
1108
1109 /**
1110 * Returns true if from1-to1 and from2-to2 vertors directions are opposite
1111 */
1112 private static boolean isOppositeDirection(EastNorth from1, EastNorth to1, EastNorth from2, EastNorth to2) {
1113 return (from1.getX()-to1.getX())*(from2.getX()-to2.getX())
1114 +(from1.getY()-to1.getY())*(from2.getY()-to2.getY()) < 0;
1115 }
1116
1117 /**
1118 * Draws right angle symbol at specified position.
1119 * @param g2 the Graphics2D object used to draw on
1120 * @param center center point of angle
1121 * @param normal vector of normal
1122 * @param mirror {@code true} if symbol should be mirrored by the normal
1123 */
1124 private void drawAngleSymbol(Graphics2D g2, Point2D center, Point2D normal, boolean mirror) {
1125 // EastNorth units per pixel
1126 double factor = 1.0/g2.getTransform().getScaleX();
1127 double raoffsetx = symbolSize*factor*normal.getX();
1128 double raoffsety = symbolSize*factor*normal.getY();
1129
1130 double cx = center.getX(), cy = center.getY();
1131 double k = mirror ? -1 : 1;
1132 Point2D ra1 = new Point2D.Double(cx + raoffsetx, cy + raoffsety);
1133 Point2D ra3 = new Point2D.Double(cx - raoffsety*k, cy + raoffsetx*k);
1134 Point2D ra2 = new Point2D.Double(ra1.getX() - raoffsety*k, ra1.getY() + raoffsetx*k);
1135
1136 GeneralPath ra = new GeneralPath();
1137 ra.moveTo((float) ra1.getX(), (float) ra1.getY());
1138 ra.lineTo((float) ra2.getX(), (float) ra2.getY());
1139 ra.lineTo((float) ra3.getX(), (float) ra3.getY());
1140 g2.setStroke(helperStrokeRA);
1141 g2.draw(ra);
1142 }
1143
1144 /**
1145 * Draws given reference segment.
1146 * @param g2 the Graphics2D object used to draw on
1147 * @param mv map view
1148 * @param seg the reference segment
1149 */
1150 private void drawReferenceSegment(Graphics2D g2, MapView mv, ReferenceSegment seg) {
1151 Point p1 = mv.getPoint(seg.p1);
1152 Point p2 = mv.getPoint(seg.p2);
1153 GeneralPath b = new GeneralPath();
1154 b.moveTo(p1.x, p1.y);
1155 b.lineTo(p2.x, p2.y);
1156 g2.setColor(helperColor);
1157 g2.setStroke(helperStrokeDash);
1158 g2.draw(b);
1159 }
1160
1161 /**
1162 * Creates a new Line that extends off the edge of the viewport in one direction
1163 * @param start The start point of the line
1164 * @param unitvector A unit vector denoting the direction of the line
1165 * @param g the Graphics2D object it will be used on
1166 * @return created line
1167 */
1168 private static Line2D createSemiInfiniteLine(Point2D start, Point2D unitvector, Graphics2D g) {
1169 Rectangle bounds = g.getDeviceConfiguration().getBounds();
1170 try {
1171 AffineTransform invtrans = g.getTransform().createInverse();
1172 Point2D widthpoint = invtrans.deltaTransform(new Point2D.Double(bounds.width, 0), null);
1173 Point2D heightpoint = invtrans.deltaTransform(new Point2D.Double(0, bounds.height), null);
1174
1175 // Here we should end up with a gross overestimate of the maximum viewport diagonal in what
1176 // Graphics2D calls 'user space'. Essentially a manhattan distance of manhattan distances.
1177 // This can be used as a safe length of line to generate which will always go off-viewport.
1178 double linelength = Math.abs(widthpoint.getX()) + Math.abs(widthpoint.getY())
1179 + Math.abs(heightpoint.getX()) + Math.abs(heightpoint.getY());
1180
1181 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * linelength), start.getY()
1182 + (unitvector.getY() * linelength)));
1183 } catch (NoninvertibleTransformException e) {
1184 return new Line2D.Double(start, new Point2D.Double(start.getX() + (unitvector.getX() * 10), start.getY()
1185 + (unitvector.getY() * 10)));
1186 }
1187 }
1188}
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