/**
* Tests if the areas have some intersections to join.
*
* @param areas Areas to test
* @return @{code true} if areas are joinable
*/
private boolean testJoin(List<Multipolygon> areas) {
List<Way> allStartingWays = new ArrayList<Way>();
for (Multipolygon area : areas) {
allStartingWays.add(area.outerWay);
allStartingWays.addAll(area.innerWays);
}
// find intersection points
Set<Node> nodes = Geometry.addIntersections(allStartingWays, true, cmds);
return !nodes.isEmpty();
}
/**
* Will join two or more overlapping areas
*
* @param areas list of areas to join
* @return new area formed.
*/
private JoinAreasResult joinAreas(List<Multipolygon> areas) throws UserCancelException {
JoinAreasResult result = new JoinAreasResult();
result.hasChanges = false;
List<Way> allStartingWays = new ArrayList<Way>();
List<Way> innerStartingWays = new ArrayList<Way>();
List<Way> outerStartingWays = new ArrayList<Way>();
for (Multipolygon area : areas) {
outerStartingWays.add(area.outerWay);
innerStartingWays.addAll(area.innerWays);
}
allStartingWays.addAll(innerStartingWays);
allStartingWays.addAll(outerStartingWays);
// first remove nodes in the same coordinate
boolean removedDuplicates = false;
removedDuplicates |= removeDuplicateNodes(allStartingWays);
if (removedDuplicates) {
result.hasChanges = true;
commitCommands(marktr("Removed duplicate nodes"));
}
// find intersection points
Set<Node> nodes = Geometry.addIntersections(allStartingWays, false, cmds);
// no intersections, return.
if (nodes.isEmpty()) return result;
commitCommands(marktr("Added node on all intersections"));
List<RelationRole> relations = new ArrayList<RelationRole>();
// Remove ways from all relations so ways can be combined/split quietly
for (Way way : allStartingWays) {
relations.addAll(removeFromAllRelations(way));
}
// Don't warn now, because it will really look corrupted
boolean warnAboutRelations = !relations.isEmpty() && allStartingWays.size() > 1;
List<WayInPolygon> preparedWays = new ArrayList<WayInPolygon>();
for (Way way : outerStartingWays) {
List<Way> splitWays = splitWayOnNodes(way, nodes);
preparedWays.addAll(markWayInsideSide(splitWays, false));
}
for (Way way : innerStartingWays) {
List<Way> splitWays = splitWayOnNodes(way, nodes);
preparedWays.addAll(markWayInsideSide(splitWays, true));
}
// Find boundary ways
List<Way> discardedWays = new ArrayList<Way>();
List<AssembledPolygon> bounadries = findBoundaryPolygons(preparedWays, discardedWays);
// find polygons
List<AssembledMultipolygon> preparedPolygons = findPolygons(bounadries);
// assemble final polygons
List<Multipolygon> polygons = new ArrayList<Multipolygon>();
Set<Relation> relationsToDelete = new LinkedHashSet<Relation>();
for (AssembledMultipolygon pol : preparedPolygons) {
// create the new ways
Multipolygon resultPol = joinPolygon(pol);
// create multipolygon relation, if necessary.
RelationRole ownMultipolygonRelation =
addOwnMultigonRelation(resultPol.innerWays, resultPol.outerWay);
// add back the original relations, merged with our new multipolygon relation
fixRelations(relations, resultPol.outerWay, ownMultipolygonRelation, relationsToDelete);
// strip tags from inner ways
// TODO: preserve tags on existing inner ways
stripTags(resultPol.innerWays);
polygons.add(resultPol);
}
commitCommands(marktr("Assemble new polygons"));
for (Relation rel : relationsToDelete) {
cmds.add(new DeleteCommand(rel));
}
commitCommands(marktr("Delete relations"));
// Delete the discarded inner ways
if (!discardedWays.isEmpty()) {
Command deleteCmd = DeleteCommand.delete(Main.main.getEditLayer(), discardedWays, true);
if (deleteCmd != null) {
cmds.add(deleteCmd);
commitCommands(marktr("Delete Ways that are not part of an inner multipolygon"));
}
}
makeCommitsOneAction(marktr("Joined overlapping areas"));
if (warnAboutRelations) {
new Notification(
tr(
"Some of the ways were part of relations that have been modified.<br>Please verify no errors have been introduced."))
.setIcon(JOptionPane.INFORMATION_MESSAGE)
.setDuration(Notification.TIME_LONG)
.show();
}
result.hasChanges = true;
result.polygons = polygons;
return result;
}