package maps.gml.editor;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.Color;
import java.awt.Point;
import java.awt.Insets;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import javax.swing.undo.AbstractUndoableEdit;
import maps.gml.view.NodeDecorator;
import maps.gml.view.SquareNodeDecorator;
import maps.gml.view.EdgeDecorator;
import maps.gml.view.LineEdgeDecorator;
import maps.gml.GMLNode;
import maps.gml.GMLEdge;
import maps.gml.GMLCoordinates;
import maps.gml.GMLObject;
/**
A tool for merging lines by deleting a common node.
*/
public class MergeLinesTool extends AbstractTool {
private static final Color HIGHLIGHT_COLOUR = Color.BLUE;
private static final int HIGHLIGHT_SIZE = 6;
private Listener listener;
private NodeDecorator nodeHighlight;
private EdgeDecorator edgeHighlight;
private GMLNode selected;
private Collection<GMLEdge> attachedEdges;
/**
Construct a MergeLinesTool.
@param editor The editor instance.
*/
public MergeLinesTool(GMLEditor editor) {
super(editor);
listener = new Listener();
nodeHighlight = new SquareNodeDecorator(HIGHLIGHT_COLOUR, HIGHLIGHT_SIZE);
edgeHighlight = new LineEdgeDecorator(HIGHLIGHT_COLOUR);
selected = null;
attachedEdges = new HashSet<GMLEdge>();
}
@Override
public String getName() {
return "Merge lines";
}
@Override
public void activate() {
editor.getViewer().addMouseListener(listener);
editor.getViewer().addMouseMotionListener(listener);
selected = null;
attachedEdges.clear();
}
@Override
public void deactivate() {
editor.getViewer().removeMouseListener(listener);
editor.getViewer().removeMouseMotionListener(listener);
editor.getViewer().clearAllNodeDecorators();
editor.getViewer().clearAllEdgeDecorators();
editor.getViewer().repaint();
}
private void highlightNode(GMLNode node, Collection<GMLEdge> attached) {
if (selected == node) {
return;
}
if (selected != null) {
editor.getViewer().clearNodeDecorator(selected);
editor.getViewer().clearEdgeDecorator(attachedEdges);
}
selected = node;
attachedEdges.clear();
if (selected != null) {
attachedEdges.addAll(attached);
editor.getViewer().setNodeDecorator(nodeHighlight, selected);
editor.getViewer().setEdgeDecorator(edgeHighlight, attachedEdges);
}
editor.getViewer().repaint();
}
private class Listener implements MouseListener, MouseMotionListener {
@Override
public void mouseMoved(MouseEvent e) {
Point p = fixEventPoint(e.getPoint());
GMLCoordinates c = editor.getViewer().getCoordinatesAtPoint(p.x, p.y);
GMLNode node = editor.getMap().findNearestNode(c.getX(), c.getY());
Collection<GMLEdge> attached = editor.getMap().getAttachedEdges(node);
if (attached.size() == 2) {
highlightNode(node, attached);
}
}
@Override
public void mouseClicked(MouseEvent e) {
if (selected == null) {
return;
}
if (e.getButton() == MouseEvent.BUTTON1) {
Iterator<GMLEdge> it = attachedEdges.iterator();
GMLEdge newEdge = editor.getMap().mergeEdges(it.next(), it.next());
Collection<GMLObject> deleted = editor.getMap().removeNode(selected);
editor.setChanged();
editor.addEdit(new MergeEdit(selected, deleted, newEdge));
highlightNode(null, null);
}
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseDragged(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
private Point fixEventPoint(Point p) {
Insets insets = editor.getViewer().getInsets();
return new Point(p.x - insets.left, p.y - insets.top);
}
}
private class MergeEdit extends AbstractUndoableEdit {
private GMLNode deletedNode;
private Collection<GMLObject> deletedObjects;
private GMLEdge newEdge;
public MergeEdit(GMLNode node, Collection<GMLObject> deletedObjects, GMLEdge newEdge) {
this.deletedNode = node;
this.deletedObjects = deletedObjects;
this.newEdge = newEdge;
}
@Override
public void undo() {
super.undo();
editor.getMap().addNode(deletedNode);
editor.getMap().add(deletedObjects);
editor.getMap().removeEdge(newEdge);
editor.getViewer().repaint();
}
@Override
public void redo() {
super.redo();
editor.getMap().removeNode(deletedNode);
editor.getMap().remove(deletedObjects);
editor.getMap().addEdge(newEdge);
editor.getViewer().repaint();
}
}
}