1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.g2d.element.handler;
14 import java.awt.Shape;
15 import java.awt.geom.AffineTransform;
17 import org.simantics.g2d.diagram.handler.Topology.Terminal;
18 import org.simantics.g2d.element.IElement;
19 import org.simantics.g2d.element.handler.impl.StaticTerminals;
20 import org.simantics.g2d.utils.geom.DirectionSet;
24 * @See {@link TerminalTopology} Enumeration of terminals
25 * @See {@link StaticTerminals} Compile handler for elements with static terminals (almost all)
26 * @author Toni Kalajainen
28 public interface TerminalLayout extends ElementHandler {
31 * Get specified terminal transformation on specified element
35 * @return position of a terminal or null if specified terminal does not
36 * belong to the specified element. The returned AffineTransform
37 * must be treated as if it were immutable since the implementation
38 * is allowed to returned singleton/cached values.
40 AffineTransform getTerminalPosition(IElement node, Terminal t);
43 * Get Terminal direction
46 * @param directions collection where directions are added (compass direction, 0 + n*360=north, n e N)
47 * @return true if this handler could tell the terminal direction
49 boolean getTerminalDirection(IElement node, Terminal t, DirectionSet directions);
52 * Get shape of a terminal.
53 * If terminal has a shape its selection is based on it and is zoom-level dependent.
54 * If a terminal has no shape it is a point and zoom-level independent.
56 * Only the area that fits into the element will be picked.
58 * @return shape shape or null
60 Shape getTerminalShape(IElement node, Terminal t);