001// License: GPL. For details, see LICENSE file. 002package org.openstreetmap.josm.command; 003 004import static org.openstreetmap.josm.tools.I18n.trn; 005 006import java.util.Collection; 007import java.util.Collections; 008import java.util.Iterator; 009import java.util.LinkedList; 010import java.util.List; 011 012import javax.swing.Icon; 013 014import org.openstreetmap.josm.data.coor.EastNorth; 015import org.openstreetmap.josm.data.coor.LatLon; 016import org.openstreetmap.josm.data.osm.Node; 017import org.openstreetmap.josm.data.osm.OsmPrimitive; 018import org.openstreetmap.josm.data.osm.visitor.AllNodesVisitor; 019import org.openstreetmap.josm.data.projection.Projections; 020import org.openstreetmap.josm.tools.ImageProvider; 021 022/** 023 * MoveCommand moves a set of OsmPrimitives along the map. It can be moved again 024 * to collect several MoveCommands into one command. 025 * 026 * @author imi 027 */ 028public class MoveCommand extends Command { 029 /** 030 * The objects that should be moved. 031 */ 032 private Collection<Node> nodes = new LinkedList<Node>(); 033 /** 034 * Starting position, base command point, current (mouse-drag) position = startEN + (x,y) = 035 */ 036 private EastNorth startEN; 037 038 /** 039 * x difference movement. Coordinates are in northern/eastern 040 */ 041 private double x; 042 /** 043 * y difference movement. Coordinates are in northern/eastern 044 */ 045 private double y; 046 047 private double backupX; 048 private double backupY; 049 050 /** 051 * List of all old states of the objects. 052 */ 053 private List<OldNodeState> oldState = new LinkedList<OldNodeState>(); 054 055 public MoveCommand(OsmPrimitive osm, double x, double y) { 056 this(Collections.singleton(osm), x, y); 057 } 058 059 public MoveCommand(Node node, LatLon position) { 060 this(Collections.singleton((OsmPrimitive) node), node.getEastNorth().sub(Projections.project(position))); 061 } 062 063 public MoveCommand(Collection<OsmPrimitive> objects, EastNorth offset) { 064 this(objects, offset.getX(), offset.getY()); 065 } 066 067 /** 068 * Create a MoveCommand and assign the initial object set and movement vector. 069 */ 070 public MoveCommand(Collection<OsmPrimitive> objects, double x, double y) { 071 super(); 072 startEN = null; 073 saveCheckpoint(); // (0,0) displacement will be saved 074 this.x = x; 075 this.y = y; 076 this.nodes = AllNodesVisitor.getAllNodes(objects); 077 for (Node n : this.nodes) { 078 oldState.add(new OldNodeState(n)); 079 } 080 } 081 082 public MoveCommand(Collection<OsmPrimitive> objects, EastNorth start, EastNorth end) { 083 this(objects, end.getX()-start.getX(), end.getY()-start.getY()); 084 startEN = start; 085 } 086 087 public MoveCommand(OsmPrimitive p, EastNorth start, EastNorth end) { 088 this(Collections.singleton(p), end.getX()-start.getX(), end.getY()-start.getY()); 089 startEN = start; 090 } 091 092 /** 093 * Move the same set of objects again by the specified vector. The vectors 094 * are added together and so the resulting will be moved to the previous 095 * vector plus this one. 096 * 097 * The move is immediately executed and any undo will undo both vectors to 098 * the original position the objects had before first moving. 099 */ 100 public void moveAgain(double x, double y) { 101 for (Node n : nodes) { 102 n.setEastNorth(n.getEastNorth().add(x, y)); 103 } 104 this.x += x; 105 this.y += y; 106 } 107 108 public void moveAgainTo(double x, double y) { 109 moveAgain(x - this.x, y - this.y); 110 } 111 112 /** 113 * Change the displacement vector to have endpoint @param currentEN 114 * starting point is startEN 115 */ 116 public void applyVectorTo(EastNorth currentEN) { 117 if (startEN == null) 118 return; 119 x = currentEN.getX() - startEN.getX(); 120 y = currentEN.getY() - startEN.getY(); 121 updateCoordinates(); 122 } 123 124 /** 125 * Changes base point of movement 126 * @param newDraggedStartPoint - new starting point after movement (where user clicks to start new drag) 127 */ 128 public void changeStartPoint(EastNorth newDraggedStartPoint) { 129 startEN = new EastNorth(newDraggedStartPoint.getX()-x, newDraggedStartPoint.getY()-y); 130 } 131 132 /** 133 * Save curent displacement to restore in case of some problems 134 */ 135 public void saveCheckpoint() { 136 backupX = x; 137 backupY = y; 138 } 139 140 /** 141 * Restore old displacement in case of some problems 142 */ 143 public void resetToCheckpoint() { 144 x = backupX; 145 y = backupY; 146 updateCoordinates(); 147 } 148 149 private void updateCoordinates() { 150 Iterator<OldNodeState> it = oldState.iterator(); 151 for (Node n : nodes) { 152 OldNodeState os = it.next(); 153 if (os.eastNorth != null) { 154 n.setEastNorth(os.eastNorth.add(x, y)); 155 } 156 } 157 } 158 159 @Override public boolean executeCommand() { 160 for (Node n : nodes) { 161 // in case #3892 happens again 162 if (n == null) 163 throw new AssertionError("null detected in node list"); 164 EastNorth en = n.getEastNorth(); 165 if (en != null) { 166 n.setEastNorth(en.add(x, y)); 167 n.setModified(true); 168 } 169 } 170 return true; 171 } 172 173 @Override public void undoCommand() { 174 Iterator<OldNodeState> it = oldState.iterator(); 175 for (Node n : nodes) { 176 OldNodeState os = it.next(); 177 n.setCoor(os.latlon); 178 n.setModified(os.modified); 179 } 180 } 181 182 @Override public void fillModifiedData(Collection<OsmPrimitive> modified, Collection<OsmPrimitive> deleted, Collection<OsmPrimitive> added) { 183 for (OsmPrimitive osm : nodes) { 184 modified.add(osm); 185 } 186 } 187 188 @Override 189 public String getDescriptionText() { 190 return trn("Move {0} node", "Move {0} nodes", nodes.size(), nodes.size()); 191 } 192 193 @Override 194 public Icon getDescriptionIcon() { 195 return ImageProvider.get("data", "node"); 196 } 197 198 @Override 199 public Collection<Node> getParticipatingPrimitives() { 200 return nodes; 201 } 202}