Mercurial > projects > dwt2
view org.eclipse.draw2d/src/org/eclipse/draw2d/MidpointLocator.d @ 125:c43718956f21 default tip
Updated the snippets status.
author | Jacob Carlborg <doob@me.com> |
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date | Thu, 11 Aug 2011 19:55:14 +0200 |
parents | bc29606a740c |
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/******************************************************************************* * Copyright (c) 2000, 2005 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module org.eclipse.draw2d.MidpointLocator; import java.lang.all; import org.eclipse.draw2d.geometry.Point; import org.eclipse.draw2d.ConnectionLocator; import org.eclipse.draw2d.Connection; /** * A ConnectionLocator that is used to place figures at the midpoint between two points on * a {@link org.eclipse.draw2d.Connection}. */ public class MidpointLocator : ConnectionLocator { private int index; /** * Constructs a MidpointLocator with associated Connection <i>c</i> and index <i>i</i>. * The points at index i and i+1 on the connection are used to calculate the midpoint of * the line segment. * * @param c the connection associated with the locator * @param i the point from where the connection's midpoint will be calculated. * @since 2.0 */ public this(Connection c, int i) { super(c); index = i; } /** * Returns this MidpointLocator's index. This integer represents the position of the start * point in this MidpointLocator's associated {@link Connection} from where midpoint * calculation will be made. * * @return the locator's index * @since 2.0 */ protected int getIndex() { return index; } /** * Returns the point of reference associated with this locator. This point will be midway * between points at 'index' and 'index' + 1. * * @return the reference point * @since 2.0 */ protected Point getReferencePoint() { Connection conn = getConnection(); Point p = Point.SINGLETON; Point p1 = conn.getPoints().getPoint(getIndex()); Point p2 = conn.getPoints().getPoint(getIndex() + 1); conn.translateToAbsolute(p1); conn.translateToAbsolute(p2); p.x = (p2.x - p1.x) / 2 + p1.x; p.y = (p2.y - p1.y) / 2 + p1.y; return p; } }