Generate Polygon : Shape « 2D Graphics GUI « Java

Generate Polygon

import java.awt.Polygon;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

 * $Id:,v 1.4 2008/10/14 22:31:46 rah003 Exp $
 * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
public class Utils {

  public static Shape generatePolygon(int sides, int outsideRadius, boolean normalize) {
    return generatePolygon(sides, outsideRadius, 0, normalize);

  public static Shape generatePolygon(int sides, int outsideRadius, int insideRadius,
      boolean normalize) {
    Shape shape = generatePolygon(sides, outsideRadius, insideRadius);
    if (normalize) {
      Rectangle2D bounds = shape.getBounds2D();
      GeneralPath path = new GeneralPath(shape);
      shape = path.createTransformedShape(AffineTransform.getTranslateInstance(-bounds.getX(),
    return shape;

  public static Shape generatePolygon(int sides, int outsideRadius, int insideRadius) {

    if (sides < 3) {
      return new Ellipse2D.Float(0, 0, 10, 10);

    AffineTransform trans = new AffineTransform();
    Polygon poly = new Polygon();
    for (int i = 0; i < sides; i++) {
      trans.rotate(Math.PI * 2 / (float) sides / 2);
      Point2D out = trans.transform(new Point2D.Float(0, outsideRadius), null);
      poly.addPoint((int) out.getX(), (int) out.getY());
      trans.rotate(Math.PI * 2 / (float) sides / 2);
      if (insideRadius > 0) {
        Point2D in = trans.transform(new Point2D.Float(0, insideRadius), null);
        poly.addPoint((int) in.getX(), (int) in.getY());

    return poly;


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