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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.Point;
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import org.eclipse.draw2d.geometry.PointList;
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import org.eclipse.draw2d.geometry.Ray;
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/**
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* Automatic router that spreads its {@link Connection Connections} in a
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* fan-like fashion upon collision.
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*/
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public class FanRouter extends AutomaticRouter {
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private int separation = 10;
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/**
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* Returns the separation in pixels between fanned connections.
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*
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* @return the separation
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* @since 2.0
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*/
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public int getSeparation() {
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return separation;
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}
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/**
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* Modifies a given PointList that collides with some other PointList. The
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* given <i>index</i> indicates that this it the i<sup>th</sup> PointList in
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* a group of colliding points.
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*
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* @param points
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* the colliding points
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* @param index
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* the index
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*/
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protected void handleCollision(PointList points, int index) {
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Point start = points.getFirstPoint();
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Point end = points.getLastPoint();
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if (start.equals(end))
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return;
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Point midPoint = new Point((end.x + start.x) / 2, (end.y + start.y) / 2);
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int position = end.getPosition(start);
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Ray ray;
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if (position == PositionConstants.SOUTH
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|| position == PositionConstants.EAST)
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ray = new Ray(start, end);
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else
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ray = new Ray(end, start);
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double length = ray.length();
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double xSeparation = separation * ray.x / length;
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double ySeparation = separation * ray.y / length;
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Point bendPoint;
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if (index % 2 == 0) {
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bendPoint = new Point(
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midPoint.x + (index / 2) * (-1 * ySeparation), midPoint.y
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+ (index / 2) * xSeparation);
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} else {
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bendPoint = new Point(midPoint.x + (index / 2) * ySeparation,
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midPoint.y + (index / 2) * (-1 * xSeparation));
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}
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if (!bendPoint.equals(midPoint))
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points.insertPoint(bendPoint, 1);
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}
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/**
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* Sets the colliding {@link Connection Connection's} separation in pixels.
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*
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* @param value
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* the separation
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* @since 2.0
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*/
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public void setSeparation(int value) {
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separation = value;
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}
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}
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