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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.graph2;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.QuadCurve2D;
import java.util.ArrayList;
import java.util.List;

public class Polyline2 {

	private final List lines = new ArrayList();
	private Point2D lastCurrent;
	private final Point2D end;

	public Polyline2(Point2D start, Point2D end) {
		lastCurrent = start;
		this.end = end;
	}

	public void addLine(Line2D.Double newLine) {
		// Log.println("# Polyline2::addLine " +
		// GeomUtils.toString(newLine));
		if (lastCurrent.equals(newLine.getP1()) == false) {
			lines.add(new Line2D.Double(lastCurrent, newLine.getP1()));
		}
		lines.add(newLine);
		lastCurrent = newLine.getP2();
	}

	private boolean debug = false;

	public void draw(Graphics2D g2d) {
		close();
		if (debug) {
			g2d.setColor(Color.GREEN);
			drawDebug(g2d);
		}
		g2d.setColor(Color.BLUE);
		final List centers = new ArrayList();
		for (Line2D.Double l : lines) {
			centers.add(GeomUtils.getCenter(l));
		}
		g2d.draw(new Line2D.Double(lines.get(0).getP1(), centers.get(0)));
		g2d.draw(new Line2D.Double(centers.get(centers.size() - 1), end));
		for (int i = 0; i < lines.size() - 1; i++) {
			final Point2D c1 = centers.get(i);
			final Point2D c2 = centers.get(i + 1);
			final Point2D ctrl = lines.get(i).getP2();
			assert ctrl.equals(lines.get(i + 1).getP1());
			final QuadCurve2D.Double quad = new QuadCurve2D.Double(c1.getX(), c1.getY(), ctrl.getX(), ctrl.getY(), c2
					.getX(), c2.getY());
			g2d.draw(quad);
		}
		if (debug) {
			for (Point2D.Double c : centers) {
				GeomUtils.fillPoint2D(g2d, c);
			}
		}
	}

	private void drawDebug(Graphics2D g2d) {
		for (Line2D.Double l : lines) {
			g2d.draw(l);
			GeomUtils.fillPoint2D(g2d, l.getP1());
			GeomUtils.fillPoint2D(g2d, l.getP2());
		}
	}

	private void close() {
		if (lastCurrent.equals(end) == false) {
			lines.add(new Line2D.Double(lastCurrent, end));
		}
	}
}