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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