Source Code Cross Referenced for RectIterator.java in  » 6.0-JDK-Core » AWT » java » awt » geom » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Core » AWT » java.awt.geom 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001        /*
002         * Copyright 1997 Sun Microsystems, Inc.  All Rights Reserved.
003         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004         *
005         * This code is free software; you can redistribute it and/or modify it
006         * under the terms of the GNU General Public License version 2 only, as
007         * published by the Free Software Foundation.  Sun designates this
008         * particular file as subject to the "Classpath" exception as provided
009         * by Sun in the LICENSE file that accompanied this code.
010         *
011         * This code is distributed in the hope that it will be useful, but WITHOUT
012         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014         * version 2 for more details (a copy is included in the LICENSE file that
015         * accompanied this code).
016         *
017         * You should have received a copy of the GNU General Public License version
018         * 2 along with this work; if not, write to the Free Software Foundation,
019         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020         *
021         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022         * CA 95054 USA or visit www.sun.com if you need additional information or
023         * have any questions.
024         */
025
026        package java.awt.geom;
027
028        import java.util.*;
029
030        /**
031         * A utility class to iterate over the path segments of a rectangle
032         * through the PathIterator interface.
033         *
034         * @version 10 Feb 1997
035         * @author	Jim Graham
036         */
037        class RectIterator implements  PathIterator {
038            double x, y, w, h;
039            AffineTransform affine;
040            int index;
041
042            RectIterator(Rectangle2D r, AffineTransform at) {
043                this .x = r.getX();
044                this .y = r.getY();
045                this .w = r.getWidth();
046                this .h = r.getHeight();
047                this .affine = at;
048                if (w < 0 || h < 0) {
049                    index = 6;
050                }
051            }
052
053            /**
054             * Return the winding rule for determining the insideness of the
055             * path.
056             * @see #WIND_EVEN_ODD
057             * @see #WIND_NON_ZERO
058             */
059            public int getWindingRule() {
060                return WIND_NON_ZERO;
061            }
062
063            /**
064             * Tests if there are more points to read.
065             * @return true if there are more points to read
066             */
067            public boolean isDone() {
068                return index > 5;
069            }
070
071            /**
072             * Moves the iterator to the next segment of the path forwards
073             * along the primary direction of traversal as long as there are
074             * more points in that direction.
075             */
076            public void next() {
077                index++;
078            }
079
080            /**
081             * Returns the coordinates and type of the current path segment in
082             * the iteration.
083             * The return value is the path segment type:
084             * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
085             * A float array of length 6 must be passed in and may be used to
086             * store the coordinates of the point(s).
087             * Each point is stored as a pair of float x,y coordinates.
088             * SEG_MOVETO and SEG_LINETO types will return one point,
089             * SEG_QUADTO will return two points,
090             * SEG_CUBICTO will return 3 points
091             * and SEG_CLOSE will not return any points.
092             * @see #SEG_MOVETO
093             * @see #SEG_LINETO
094             * @see #SEG_QUADTO
095             * @see #SEG_CUBICTO
096             * @see #SEG_CLOSE
097             */
098            public int currentSegment(float[] coords) {
099                if (isDone()) {
100                    throw new NoSuchElementException(
101                            "rect iterator out of bounds");
102                }
103                if (index == 5) {
104                    return SEG_CLOSE;
105                }
106                coords[0] = (float) x;
107                coords[1] = (float) y;
108                if (index == 1 || index == 2) {
109                    coords[0] += (float) w;
110                }
111                if (index == 2 || index == 3) {
112                    coords[1] += (float) h;
113                }
114                if (affine != null) {
115                    affine.transform(coords, 0, coords, 0, 1);
116                }
117                return (index == 0 ? SEG_MOVETO : SEG_LINETO);
118            }
119
120            /**
121             * Returns the coordinates and type of the current path segment in
122             * the iteration.
123             * The return value is the path segment type:
124             * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
125             * A double array of length 6 must be passed in and may be used to
126             * store the coordinates of the point(s).
127             * Each point is stored as a pair of double x,y coordinates.
128             * SEG_MOVETO and SEG_LINETO types will return one point,
129             * SEG_QUADTO will return two points,
130             * SEG_CUBICTO will return 3 points
131             * and SEG_CLOSE will not return any points.
132             * @see #SEG_MOVETO
133             * @see #SEG_LINETO
134             * @see #SEG_QUADTO
135             * @see #SEG_CUBICTO
136             * @see #SEG_CLOSE
137             */
138            public int currentSegment(double[] coords) {
139                if (isDone()) {
140                    throw new NoSuchElementException(
141                            "rect iterator out of bounds");
142                }
143                if (index == 5) {
144                    return SEG_CLOSE;
145                }
146                coords[0] = x;
147                coords[1] = y;
148                if (index == 1 || index == 2) {
149                    coords[0] += w;
150                }
151                if (index == 2 || index == 3) {
152                    coords[1] += h;
153                }
154                if (affine != null) {
155                    affine.transform(coords, 0, coords, 0, 1);
156                }
157                return (index == 0 ? SEG_MOVETO : SEG_LINETO);
158            }
159        }
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