package org.openstreetmap.josm.command;
import static org.openstreetmap.josm.tools.I18n.trn;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import javax.swing.JLabel;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.MutableTreeNode;
import org.openstreetmap.josm.data.coor.EastNorth;
import org.openstreetmap.josm.data.coor.LatLon;
import org.openstreetmap.josm.data.osm.Node;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.visitor.AllNodesVisitor;
import org.openstreetmap.josm.tools.ImageProvider;
/**
* RotateCommand rotates a number of objects around their centre.
*
* @author Frederik Ramm <frederik@remote.org>
*/
public class RotateCommand extends Command {
/**
* The objects to rotate.
*/
private Collection<Node> nodes = new LinkedList<Node>();
/**
* pivot point
*/
private EastNorth pivot;
/**
* Small helper for holding the interesting part of the old data state of the
* objects.
*/
public static class OldState {
LatLon latlon;
EastNorth eastNorth;
boolean modified;
}
/**
* angle of rotation starting click to pivot
*/
private double startAngle;
/**
* computed rotation angle between starting click and current mouse pos
*/
private double rotationAngle;
/**
* List of all old states of the objects.
*/
private Map<Node, OldState> oldState = new HashMap<Node, OldState>();
/**
* Creates a RotateCommand.
* Assign the initial object set, compute pivot point and rotation angle.
* Computation of pivot point is done by the same rules that are used in
* the "align nodes in circle" action.
*/
public RotateCommand(Collection<OsmPrimitive> objects, EastNorth start, EastNorth end) {
this.nodes = AllNodesVisitor.getAllNodes(objects);
pivot = new EastNorth(0,0);
for (Node n : this.nodes) {
OldState os = new OldState();
os.latlon = new LatLon(n.getCoor());
os.eastNorth = n.getEastNorth();
os.modified = n.isModified();
oldState.put(n, os);
pivot = pivot.add(os.eastNorth.east(), os.eastNorth.north());
}
pivot = new EastNorth(pivot.east()/this.nodes.size(), pivot.north()/this.nodes.size());
rotationAngle = Math.PI/2;
rotateAgain(start, end);
}
/**
* Rotate the same set of objects again, by the angle between given
* start and end nodes. Internally this is added to the existing
* rotation so a later undo will undo the whole rotation.
*/
public void rotateAgain(EastNorth start, EastNorth end) {
// compute angle
startAngle = Math.atan2(start.east()-pivot.east(), start.north()-pivot.north());
double endAngle = Math.atan2(end.east()-pivot.east(), end.north()-pivot.north());
rotationAngle += startAngle - endAngle;
rotateNodes(false);
}
/**
* Helper for actually rotationg the nodes.
* @param setModified - true if rotated nodes should be flagged "modified"
*/
private void rotateNodes(boolean setModified) {
for (Node n : nodes) {
double cosPhi = Math.cos(rotationAngle);
double sinPhi = Math.sin(rotationAngle);
EastNorth oldEastNorth = oldState.get(n).eastNorth;
double x = oldEastNorth.east() - pivot.east();
double y = oldEastNorth.north() - pivot.north();
double nx = sinPhi * x + cosPhi * y + pivot.east();
double ny = -cosPhi * x + sinPhi * y + pivot.north();
n.setEastNorth(new EastNorth(nx, ny));
if (setModified) {
n.setModified(true);
}
}
}
@Override public boolean executeCommand() {
rotateNodes(true);
return true;
}
@Override public void undoCommand() {
for (Node n : nodes) {
OldState os = oldState.get(n);
n.setCoor(os.latlon);
n.setModified(os.modified);
}
}
@Override public void fillModifiedData(Collection<OsmPrimitive> modified, Collection<OsmPrimitive> deleted, Collection<OsmPrimitive> added) {
for (OsmPrimitive osm : nodes) {
modified.add(osm);
}
}
@Override public MutableTreeNode description() {
return new DefaultMutableTreeNode(new JLabel(trn("Rotate {0} node", "Rotate {0} nodes", nodes.size(), nodes.size()), ImageProvider.get("data", "node"), JLabel.HORIZONTAL));
}
public Collection<Node> getRotatedNodes() {
return nodes;
}
}