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/*******************************************************************************
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* Copyright (c) 2000, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.draw2d;
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import org.eclipse.draw2d.geometry.Dimension;
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import org.eclipse.draw2d.geometry.Point;
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import org.eclipse.draw2d.geometry.PointList;
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/**
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* Repositions a {@link Figure} attached to a {@link Connection} when the
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* Connection is moved. Provides for alignment at the start (source), middle, or
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* end (target) of the Connection.
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*/
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public class ConnectionLocator extends AbstractLocator {
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/** @deprecated Use {@link #SOURCE} */
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public static final int START = 2;
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/** The start (or source) of the Connection */
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public static final int SOURCE = 2;
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/** @deprecated Use {@link #TARGET} */
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public static final int END = 3;
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/** The end (or target) of the Connection */
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public static final int TARGET = 3;
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/**
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* @deprecated Use {@link #MIDDLE} instead, since the location is not the
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* midpoint of a line-segment, but the middle of a polyline.
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*/
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public static final int MIDPOINT = 4;
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/** The middle of the Connection */
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public static final int MIDDLE = 4;
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private Connection connection;
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private int alignment;
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/**
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* Constructs a ConnectionLocator with the passed connection and
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* {@link #MIDDLE} alignment.
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*
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* @param connection
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* The Connection
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* @since 2.0
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*/
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public ConnectionLocator(Connection connection) {
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this(connection, MIDDLE);
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}
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/**
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* Constructs a ConnectionLocator with the passed Connection and alignment.
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* Valid values for the alignment are integer constants {@link #SOURCE},
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* {@link #MIDDLE}, and {@link #TARGET}.
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*
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* @param connection
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* The Connection
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* @param align
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* The alignment
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*
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* @since 2.0
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*/
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public ConnectionLocator(Connection connection, int align) {
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setConnection(connection);
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setAlignment(align);
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}
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/**
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* Returns the alignment of ConnectionLocator.
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*
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* @return The alignment
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* @since 2.0
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*/
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public int getAlignment() {
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return alignment;
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}
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/**
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* Returns connection associated with ConnectionLocator.
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*
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* @return The Connection
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* @since 2.0
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*/
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protected Connection getConnection() {
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return connection;
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}
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/**
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* Returns ConnectionLocator's reference point in absolute coordinates.
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*
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* @return The reference point
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* @since 2.0
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*/
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protected Point getReferencePoint() {
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Point p = getLocation(getConnection().getPoints());
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getConnection().translateToAbsolute(p);
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return p;
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}
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/**
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* Returns a point from the passed PointList, dependent on
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* ConnectionLocator's alignment. If the alignment is {@link #SOURCE}, it
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* returns the first point in <i>points</i>. If {@link #TARGET}, it returns
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* the last point in <i>points</i>. If {@link #MIDDLE}, it returns the
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* middle of line represented by <i>points</i>.
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*
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* @param points
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* The points in the Connection
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* @return The location
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* @since 2.0
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*/
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protected Point getLocation(PointList points) {
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switch (getAlignment()) {
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case SOURCE:
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return points.getPoint(Point.SINGLETON, 0);
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case TARGET:
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return points.getPoint(Point.SINGLETON, points.size() - 1);
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case MIDDLE:
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if (points.size() % 2 == 0) {
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int i = points.size() / 2;
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int j = i - 1;
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Point p1 = points.getPoint(j);
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Point p2 = points.getPoint(i);
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Dimension d = p2.getDifference(p1);
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return Point.SINGLETON.setLocation(p1.x + d.width / 2, p1.y
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+ d.height / 2);
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}
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int i = (points.size() - 1) / 2;
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return points.getPoint(Point.SINGLETON, i);
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default:
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return new Point();
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}
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}
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/**
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* Sets the alignment. Possible values are {@link #SOURCE}, {@link #MIDDLE},
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* and {@link #TARGET}.
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*
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* @param align
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* The alignment
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* @since 2.0
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*/
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protected void setAlignment(int align) {
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alignment = align;
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}
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/**
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* Sets the Connection to be associated with this ConnectionLocator.
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*
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* @param connection
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* The Connection
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* @since 2.0
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*/
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protected void setConnection(Connection connection) {
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this.connection = connection;
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}
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}
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