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13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
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24  */
25 
26 package java.awt.geom;
27 
28 import java.util.*;
29 
30 /**
31  * A utility class to iterate over the path segments of a rectangle
32  * through the PathIterator interface.
33  *
34  * @author      Jim Graham
35  */
36 class RectIterator implements PathIterator {
37     double x, y, w, h;
38     AffineTransform affine;
39     int index;
40 
RectIterator(Rectangle2D r, AffineTransform at)41     RectIterator(Rectangle2D r, AffineTransform at) {
42         this.x = r.getX();
43         this.y = r.getY();
44         this.w = r.getWidth();
45         this.h = r.getHeight();
46         this.affine = at;
47         if (w < 0 || h < 0) {
48             index = 6;
49         }
50     }
51 
52     /**
53      * Return the winding rule for determining the insideness of the
54      * path.
55      * @see #WIND_EVEN_ODD
56      * @see #WIND_NON_ZERO
57      */
getWindingRule()58     public int getWindingRule() {
59         return WIND_NON_ZERO;
60     }
61 
62     /**
63      * Tests if there are more points to read.
64      * @return true if there are more points to read
65      */
isDone()66     public boolean isDone() {
67         return index > 5;
68     }
69 
70     /**
71      * Moves the iterator to the next segment of the path forwards
72      * along the primary direction of traversal as long as there are
73      * more points in that direction.
74      */
next()75     public void next() {
76         index++;
77     }
78 
79     /**
80      * Returns the coordinates and type of the current path segment in
81      * the iteration.
82      * The return value is the path segment type:
83      * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
84      * A float array of length 6 must be passed in and may be used to
85      * store the coordinates of the point(s).
86      * Each point is stored as a pair of float x,y coordinates.
87      * SEG_MOVETO and SEG_LINETO types will return one point,
88      * SEG_QUADTO will return two points,
89      * SEG_CUBICTO will return 3 points
90      * and SEG_CLOSE will not return any points.
91      * @see #SEG_MOVETO
92      * @see #SEG_LINETO
93      * @see #SEG_QUADTO
94      * @see #SEG_CUBICTO
95      * @see #SEG_CLOSE
96      */
currentSegment(float[] coords)97     public int currentSegment(float[] coords) {
98         if (isDone()) {
99             throw new NoSuchElementException("rect iterator out of bounds");
100         }
101         if (index == 5) {
102             return SEG_CLOSE;
103         }
104         coords[0] = (float) x;
105         coords[1] = (float) y;
106         if (index == 1 || index == 2) {
107             coords[0] += (float) w;
108         }
109         if (index == 2 || index == 3) {
110             coords[1] += (float) h;
111         }
112         if (affine != null) {
113             affine.transform(coords, 0, coords, 0, 1);
114         }
115         return (index == 0 ? SEG_MOVETO : SEG_LINETO);
116     }
117 
118     /**
119      * Returns the coordinates and type of the current path segment in
120      * the iteration.
121      * The return value is the path segment type:
122      * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
123      * A double array of length 6 must be passed in and may be used to
124      * store the coordinates of the point(s).
125      * Each point is stored as a pair of double x,y coordinates.
126      * SEG_MOVETO and SEG_LINETO types will return one point,
127      * SEG_QUADTO will return two points,
128      * SEG_CUBICTO will return 3 points
129      * and SEG_CLOSE will not return any points.
130      * @see #SEG_MOVETO
131      * @see #SEG_LINETO
132      * @see #SEG_QUADTO
133      * @see #SEG_CUBICTO
134      * @see #SEG_CLOSE
135      */
currentSegment(double[] coords)136     public int currentSegment(double[] coords) {
137         if (isDone()) {
138             throw new NoSuchElementException("rect iterator out of bounds");
139         }
140         if (index == 5) {
141             return SEG_CLOSE;
142         }
143         coords[0] = x;
144         coords[1] = y;
145         if (index == 1 || index == 2) {
146             coords[0] += w;
147         }
148         if (index == 2 || index == 3) {
149             coords[1] += h;
150         }
151         if (affine != null) {
152             affine.transform(coords, 0, coords, 0, 1);
153         }
154         return (index == 0 ? SEG_MOVETO : SEG_LINETO);
155     }
156 }
157