Source Code Cross Referenced for LineIterator.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 1997-1999 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 line segment
032         * through the PathIterator interface.
033         *
034         * @version 	1.17, 05/05/07
035         * @author	Jim Graham
036         */
037        class LineIterator implements  PathIterator {
038            Line2D line;
039            AffineTransform affine;
040            int index;
041
042            LineIterator(Line2D l, AffineTransform at) {
043                this .line = l;
044                this .affine = at;
045            }
046
047            /**
048             * Return the winding rule for determining the insideness of the
049             * path.
050             * @see #WIND_EVEN_ODD
051             * @see #WIND_NON_ZERO
052             */
053            public int getWindingRule() {
054                return WIND_NON_ZERO;
055            }
056
057            /**
058             * Tests if there are more points to read.
059             * @return true if there are more points to read
060             */
061            public boolean isDone() {
062                return (index > 1);
063            }
064
065            /**
066             * Moves the iterator to the next segment of the path forwards
067             * along the primary direction of traversal as long as there are
068             * more points in that direction.
069             */
070            public void next() {
071                index++;
072            }
073
074            /**
075             * Returns the coordinates and type of the current path segment in
076             * the iteration.
077             * The return value is the path segment type:
078             * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
079             * A float array of length 6 must be passed in and may be used to
080             * store the coordinates of the point(s).
081             * Each point is stored as a pair of float x,y coordinates.
082             * SEG_MOVETO and SEG_LINETO types will return one point,
083             * SEG_QUADTO will return two points,
084             * SEG_CUBICTO will return 3 points
085             * and SEG_CLOSE will not return any points.
086             * @see #SEG_MOVETO
087             * @see #SEG_LINETO
088             * @see #SEG_QUADTO
089             * @see #SEG_CUBICTO
090             * @see #SEG_CLOSE
091             */
092            public int currentSegment(float[] coords) {
093                if (isDone()) {
094                    throw new NoSuchElementException(
095                            "line iterator out of bounds");
096                }
097                int type;
098                if (index == 0) {
099                    coords[0] = (float) line.getX1();
100                    coords[1] = (float) line.getY1();
101                    type = SEG_MOVETO;
102                } else {
103                    coords[0] = (float) line.getX2();
104                    coords[1] = (float) line.getY2();
105                    type = SEG_LINETO;
106                }
107                if (affine != null) {
108                    affine.transform(coords, 0, coords, 0, 1);
109                }
110                return type;
111            }
112
113            /**
114             * Returns the coordinates and type of the current path segment in
115             * the iteration.
116             * The return value is the path segment type:
117             * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
118             * A double array of length 6 must be passed in and may be used to
119             * store the coordinates of the point(s).
120             * Each point is stored as a pair of double x,y coordinates.
121             * SEG_MOVETO and SEG_LINETO types will return one point,
122             * SEG_QUADTO will return two points,
123             * SEG_CUBICTO will return 3 points
124             * and SEG_CLOSE will not return any points.
125             * @see #SEG_MOVETO
126             * @see #SEG_LINETO
127             * @see #SEG_QUADTO
128             * @see #SEG_CUBICTO
129             * @see #SEG_CLOSE
130             */
131            public int currentSegment(double[] coords) {
132                if (isDone()) {
133                    throw new NoSuchElementException(
134                            "line iterator out of bounds");
135                }
136                int type;
137                if (index == 0) {
138                    coords[0] = line.getX1();
139                    coords[1] = line.getY1();
140                    type = SEG_MOVETO;
141                } else {
142                    coords[0] = line.getX2();
143                    coords[1] = line.getY2();
144                    type = SEG_LINETO;
145                }
146                if (affine != null) {
147                    affine.transform(coords, 0, coords, 0, 1);
148                }
149                return type;
150            }
151        }
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