001/*******************************************************************************
002 * This software is provided as a supplement to the authors' textbooks on digital
003 * image processing published by Springer-Verlag in various languages and editions.
004 * Permission to use and distribute this software is granted under the BSD 2-Clause
005 * "Simplified" License (see http://opensource.org/licenses/BSD-2-Clause).
006 * Copyright (c) 2006-2023 Wilhelm Burger, Mark J. Burge. All rights reserved.
007 * Visit https://imagingbook.com for additional details.
008 ******************************************************************************/
009package imagingbook.common.geometry.shape;
010
011import imagingbook.common.geometry.basic.Pnt2d;
012
013import java.awt.Shape;
014import java.awt.geom.FlatteningPathIterator;
015import java.awt.geom.PathIterator;
016import java.util.Iterator;
017
018/**
019 * A small wrapper class to create a simple {@link Iterator} of {@link Pnt2d} to step over the individual points of a
020 * AWT {@link Shape} object. Curved shapes are flattened by a {@link FlatteningPathIterator}.
021 *
022 * @author WB
023 * @see PathIterator
024 * @see FlatteningPathIterator
025 */
026public class ShapePointIterator implements Iterator<Pnt2d> {
027        
028        private final PathIterator pi;
029        private final double coords[] = new double[6];
030        
031        public ShapePointIterator(Shape shape, double flatness) {
032                this.pi = shape.getPathIterator(null, flatness);
033        }
034
035        @Override
036        public boolean hasNext() {
037                return !pi.isDone();
038        }
039
040        @Override
041        public Pnt2d next() {
042                if (pi.isDone()) {
043                        return null;
044                }
045                else {
046                        pi.currentSegment(coords);
047                        pi.next();
048                        return Pnt2d.from(coords[0], coords[1]);
049                }
050        }
051
052        
053//      public static void main(String[] args) {
054//              Pnt2d ctr = Pnt2d.from(20, 30);
055//              GeometricCircle gc = new GeometricCircle(20, 30, 100);
056//              Shape circle = gc.getShape();
057//              System.out.println("circle = " + circle);
058//              
059////            ShapePointIterator iter = new ShapePointIterator(circle, 0.01);
060////            while(iter.hasNext()) {
061////                    Pnt2d p = iter.next();
062////                    System.out.println(p + " dist = " + gc.getDistance(p));
063////            }
064//              
065//              System.out.println("checkShape = " + gc.checkShape(circle, 0.5));
066//              
067//      }
068}