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.RelationMember; 010import org.openstreetmap.josm.data.osm.Way; 011import org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction; 012 013final class RelationSortUtils { 014 015 private RelationSortUtils() { 016 // Hide default constructor for utils classes 017 } 018 019 /** 020 * determine, if the way i is a roundabout and if yes, what type of roundabout 021 */ 022 static Direction roundaboutType(RelationMember member) { 023 if (member == null || !member.isWay()) return NONE; 024 Way w = member.getWay(); 025 return roundaboutType(w); 026 } 027 028 static Direction roundaboutType(Way w) { 029 if (w != null && 030 "roundabout".equals(w.get("junction")) && 031 w.getNodesCount() < 200 && 032 w.getNodesCount() > 2 && 033 w.getNode(0) != null && 034 w.getNode(1) != null && 035 w.getNode(2) != null && 036 w.firstNode() == w.lastNode()) { 037 /** do some simple determinant / cross pruduct test on the first 3 nodes 038 to see, if the roundabout goes clock wise or ccw */ 039 EastNorth en1 = w.getNode(0).getEastNorth(); 040 EastNorth en2 = w.getNode(1).getEastNorth(); 041 EastNorth en3 = w.getNode(2).getEastNorth(); 042 if (en1 != null && en2 != null && en3 != null) { 043 en1 = en1.sub(en2); 044 en2 = en2.sub(en3); 045 return en1.north() * en2.east() - en2.north() * en1.east() > 0 ? ROUNDABOUT_LEFT : ROUNDABOUT_RIGHT; 046 } 047 } 048 return NONE; 049 } 050 051 static boolean isBackward(final RelationMember member){ 052 return "backward".equals(member.getRole()); 053 } 054 055 static boolean isForward(final RelationMember member){ 056 return "forward".equals(member.getRole()); 057 } 058 059 static boolean isOneway(final RelationMember member){ 060 return isForward(member) || isBackward(member); 061 } 062}