| 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.Node;
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| 10 | import org.openstreetmap.josm.data.osm.RelationMember;
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| 11 | import org.openstreetmap.josm.data.osm.Way;
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| 12 | import org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction;
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| 13 |
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| 14 | final class RelationSortUtils {
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| 15 |
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| 16 | private RelationSortUtils() {
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| 17 | // Hide default constructor for utils classes
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| 18 | }
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| 19 |
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| 20 | /**
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| 21 | * determine, if the way i is a roundabout and if yes, what type of roundabout
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| 22 | * @param member relation member
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| 23 | * @return roundabout type
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| 24 | */
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| 25 | static Direction roundaboutType(RelationMember member) {
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| 26 | if (member == null || !member.isWay()) return NONE;
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| 27 | return roundaboutType(member.getWay());
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| 28 | }
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| 29 |
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| 30 | static Direction roundaboutType(Way w) {
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| 31 | if (w != null && "roundabout".equals(w.get("junction"))) {
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| 32 | int nodesCount = w.getNodesCount();
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| 33 | if (nodesCount > 2 && nodesCount < 200) {
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| 34 | Node n1 = w.getNode(0);
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| 35 | Node n2 = w.getNode(1);
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| 36 | Node n3 = w.getNode(2);
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| 37 | if (n1 != null && n2 != null && n3 != null && w.isClosed()) {
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| 38 | /** do some simple determinant / cross pruduct test on the first 3 nodes
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| 39 | to see, if the roundabout goes clock wise or ccw */
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| 40 | EastNorth en1 = n1.getEastNorth();
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| 41 | EastNorth en2 = n2.getEastNorth();
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| 42 | EastNorth en3 = n3.getEastNorth();
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| 43 | if (en1 != null && en2 != null && en3 != null) {
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| 44 | en1 = en2.subtract(en1);
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| 45 | en2 = en3.subtract(en2);
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| 46 | return en1.north() * en2.east() - en2.north() * en1.east() > 0 ? ROUNDABOUT_LEFT : ROUNDABOUT_RIGHT;
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| 47 | }
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| 48 | }
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| 49 | }
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| 50 | }
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| 51 | return NONE;
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| 52 | }
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| 53 |
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| 54 | static boolean isBackward(final RelationMember member) {
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| 55 | return "backward".equals(member.getRole());
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| 56 | }
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| 57 |
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| 58 | static boolean isForward(final RelationMember member) {
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| 59 | return "forward".equals(member.getRole());
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| 60 | }
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| 61 |
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| 62 | static boolean isOneway(final RelationMember member) {
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| 63 | return isForward(member) || isBackward(member);
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| 64 | }
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| 65 | }
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