| 1 | // License: GPL. For details, see LICENSE file.
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| 2 | package org.openstreetmap.josm.gui.dialogs.relation.sort;
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| 3 |
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| 4 | import static org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction.NONE;
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| 5 | import static org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction.ROUNDABOUT_LEFT;
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| 6 | import static org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction.ROUNDABOUT_RIGHT;
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| 7 |
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| 8 | import org.openstreetmap.josm.data.coor.EastNorth;
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| 9 | import org.openstreetmap.josm.data.osm.RelationMember;
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| 10 | import org.openstreetmap.josm.data.osm.Way;
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| 11 | import org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction;
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| 12 |
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| 13 | class RelationSortUtils {
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| 14 |
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| 15 | private RelationSortUtils() {
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| 16 | // Hide default constructor for utils classes
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| 17 | }
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| 18 |
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| 19 | /**
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| 20 | * determine, if the way i is a roundabout and if yes, what type of roundabout
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| 21 | */
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| 22 | static Direction roundaboutType(RelationMember member) {
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| 23 | if (member == null || !member.isWay()) return NONE;
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| 24 | Way w = member.getWay();
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| 25 | return roundaboutType(w);
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| 26 | }
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| 27 |
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| 28 | static Direction roundaboutType(Way w) {
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| 29 | if (w != null &&
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| 30 | "roundabout".equals(w.get("junction")) &&
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| 31 | w.getNodesCount() < 200 &&
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| 32 | w.getNodesCount() > 2 &&
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| 33 | w.getNode(0) != null &&
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| 34 | w.getNode(1) != null &&
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| 35 | w.getNode(2) != null &&
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| 36 | w.firstNode() == w.lastNode()) {
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| 37 | /** do some simple determinant / cross pruduct test on the first 3 nodes
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| 38 | to see, if the roundabout goes clock wise or ccw */
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| 39 | EastNorth en1 = w.getNode(0).getEastNorth();
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| 40 | EastNorth en2 = w.getNode(1).getEastNorth();
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| 41 | EastNorth en3 = w.getNode(2).getEastNorth();
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| 42 | if (en1 != null && en2 != null && en3 != null) {
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| 43 | en1 = en1.sub(en2);
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| 44 | en2 = en2.sub(en3);
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| 45 | return en1.north() * en2.east() - en2.north() * en1.east() > 0 ? ROUNDABOUT_LEFT : ROUNDABOUT_RIGHT;
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| 46 | }
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| 47 | }
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| 48 | return NONE;
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| 49 | }
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| 50 |
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| 51 | static boolean isBackward(final RelationMember member){
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| 52 | return member.getRole().equals("backward");
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| 53 | }
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| 54 |
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| 55 | static boolean isForward(final RelationMember member){
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| 56 | return member.getRole().equals("forward");
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| 57 | }
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| 58 |
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| 59 | static boolean isOneway(final RelationMember member){
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| 60 | return isForward(member) || isBackward(member);
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| 61 | }
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| 62 |
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| 63 | }
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