001// License: GPL. For details, see LICENSE file. 002package org.openstreetmap.josm.gui.dialogs.relation.sort; 003 004import static org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction.NONE; 005import static org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction.ROUNDABOUT_LEFT; 006import static org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction.ROUNDABOUT_RIGHT; 007 008import org.openstreetmap.josm.data.coor.EastNorth; 009import org.openstreetmap.josm.data.osm.Node; 010import org.openstreetmap.josm.data.osm.RelationMember; 011import org.openstreetmap.josm.data.osm.Way; 012import org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction; 013 014/** 015 * Utility classes for the {@link RelationSorter}. 016 */ 017final class RelationSortUtils { 018 019 private RelationSortUtils() { 020 // Hide default constructor for utils classes 021 } 022 023 /** 024 * determine, if the way i is a roundabout and if yes, what type of roundabout 025 * @param member relation member 026 * @return roundabout type 027 */ 028 static Direction roundaboutType(RelationMember member) { 029 if (member == null || !member.isWay()) return NONE; 030 return roundaboutType(member.getWay()); 031 } 032 033 static Direction roundaboutType(Way w) { 034 if (w != null && w.hasTag("junction", "roundabout")) { 035 int nodesCount = w.getNodesCount(); 036 if (nodesCount > 2 && nodesCount < 200) { 037 Node n1 = w.getNode(0); 038 Node n2 = w.getNode(1); 039 Node n3 = w.getNode(2); 040 if (n1 != null && n2 != null && n3 != null && w.isClosed()) { 041 /** do some simple determinant / cross product test on the first 3 nodes 042 to see, if the roundabout goes clock wise or ccw */ 043 EastNorth en1 = n1.getEastNorth(); 044 EastNorth en2 = n2.getEastNorth(); 045 EastNorth en3 = n3.getEastNorth(); 046 if (en1 != null && en2 != null && en3 != null) { 047 en1 = en2.subtract(en1); 048 en2 = en3.subtract(en2); 049 return en1.north() * en2.east() - en2.north() * en1.east() > 0 ? ROUNDABOUT_LEFT : ROUNDABOUT_RIGHT; 050 } 051 } 052 } 053 } 054 return NONE; 055 } 056 057 static boolean isBackward(final RelationMember member) { 058 return "backward".equals(member.getRole()); 059 } 060 061 static boolean isForward(final RelationMember member) { 062 return "forward".equals(member.getRole()); 063 } 064 065 static boolean isOneway(final RelationMember member) { 066 return isForward(member) || isBackward(member); 067 } 068}