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PlantUML is a component that allows to quickly write : * sequence diagram, * use case diagram, * class diagram, * activity diagram, * component diagram, * state diagram * object diagram
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/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2013, Arnaud Roques
 *
 * Project Info:  http://plantuml.sourceforge.net
 * 
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * Original Author:  Arnaud Roques
 * 
 * Revision $Revision: 9786 $
 *
 */
package net.sourceforge.plantuml.geom;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class PolylineBreakeable extends AbstractPolyline implements Polyline {

	static class Breakure {
		private int d;
		private int u;

		public Breakure(int u, int d) {
			this.u = u;
			this.d = d;
		}
	}

	private final List breakures = new ArrayList();

	public PolylineBreakeable copy(Pointable newStart, Pointable newEnd) {
		final PolylineBreakeable result = new PolylineBreakeable(newStart, newEnd);
		result.breakures.addAll(this.breakures);
		return result;
	}

	public PolylineBreakeable(Pointable start, Pointable end) {
		super(start, end);
	}

	public List segments() {
		if (breakures.size() == 0) {
			return Collections.singletonList(new LineSegmentInt(getStart().getPosition(), getEnd().getPosition()));
		}
		final List result = new ArrayList();
		Point2DInt cur = getStart().getPosition();
		for (Breakure breakure : breakures) {
			final Point2DInt next = getBreakurePoint(breakure);
			result.add(new LineSegmentInt(cur, next));
			cur = next;
		}
		result.add(new LineSegmentInt(cur, getEnd().getPosition()));
		assert nbSegments() == result.size();
		return Collections.unmodifiableList(result);
	}

	private Point2DInt getBreakurePoint(Breakure breakure) {
		final LineSegmentInt seg = new LineSegmentInt(getStart().getPosition(), getEnd().getPosition());
		return seg.ortho(seg.startTranslatedAsVector(breakure.u), breakure.d);
	}

	public int nbSegments() {
		return breakures.size() + 1;
	}

	public List getFreedoms() {
		final List allFreedom = new ArrayList();

		for (final Breakure breakure : breakures) {
			allFreedom.add(new XMoveable() {
				@Override
				public String toString() {
					return super.toString() + " " + PolylineBreakeable.this.toString() + "(d)";
				}

				public void moveX(int delta) {
					breakure.d += delta;
				}
			});
			allFreedom.add(new XMoveable() {
				@Override
				public String toString() {
					return super.toString() + " " + PolylineBreakeable.this.toString() + "(u)";
				}

				public void moveX(int delta) {
					breakure.u += delta;
				}
			});
			allFreedom.add(new XMoveable() {
				@Override
				public String toString() {
					return super.toString() + " " + PolylineBreakeable.this.toString() + "(ud)";
				}

				public void moveX(int delta) {
					breakure.u += delta;
					breakure.d += delta;
				}
			});
			allFreedom.add(new XMoveable() {
				@Override
				public String toString() {
					return super.toString() + " " + PolylineBreakeable.this.toString() + "(dud)";
				}

				public void moveX(int delta) {
					breakure.u += delta;
					breakure.d -= delta;
				}
			});
		}

		return Collections.unmodifiableList(allFreedom);
	}

	public void insertBetweenPoint(int u, int d) {
		breakures.add(new Breakure(u, d));
	}

	private void breakMore() {
		if (breakures.size() == 1) {
			final Breakure b = breakures.get(0);
			insertBetweenPoint(b.u / 2, 0);
		}

	}

}