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2 | 2 |
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3 | 3 | import java.util.ArrayList;
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4 | 4 | import java.util.Arrays;
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5 |
| -import java.util.Comparator; |
6 | 5 | import java.util.Stack;
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7 | 6 |
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8 | 7 | /**
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@@ -66,93 +65,4 @@ public GrahamScan(Point[] points) {
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66 | 65 | public Iterable<Point> hull() {
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67 | 66 | return new ArrayList<>(hull);
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68 | 67 | }
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69 |
| - |
70 |
| - public record Point(int x, int y) implements Comparable<Point> { |
71 |
| - |
72 |
| - /** |
73 |
| - * Default constructor |
74 |
| - * @param x x-coordinate |
75 |
| - * @param y y-coordinate |
76 |
| - */ |
77 |
| - public Point { |
78 |
| - } |
79 |
| - |
80 |
| - /** |
81 |
| - * @return the x-coordinate |
82 |
| - */ |
83 |
| - @Override |
84 |
| - public int x() { |
85 |
| - return x; |
86 |
| - } |
87 |
| - |
88 |
| - /** |
89 |
| - * @return the y-coordinate |
90 |
| - */ |
91 |
| - @Override |
92 |
| - public int y() { |
93 |
| - return y; |
94 |
| - } |
95 |
| - |
96 |
| - /** |
97 |
| - * Determines the orientation of the triplet (a, b, c). |
98 |
| - * |
99 |
| - * @param a The first point |
100 |
| - * @param b The second point |
101 |
| - * @param c The third point |
102 |
| - * @return -1 if (a, b, c) is clockwise, 0 if collinear, +1 if counterclockwise |
103 |
| - */ |
104 |
| - public static int orientation(Point a, Point b, Point c) { |
105 |
| - int val = (b.x - a.x) * (c.y - a.y) - (b.y - a.y) * (c.x - a.x); |
106 |
| - return Integer.compare(val, 0); |
107 |
| - } |
108 |
| - |
109 |
| - /** |
110 |
| - * Compares this point with another point. |
111 |
| - * |
112 |
| - * @param p2 The point to compare to |
113 |
| - * @return A positive integer if this point is greater, a negative integer if less, or 0 if equal |
114 |
| - */ |
115 |
| - @Override |
116 |
| - public int compareTo(Point p2) { |
117 |
| - int cmpY = Integer.compare(this.y, p2.y); |
118 |
| - return cmpY != 0 ? cmpY : Integer.compare(this.x, p2.x); |
119 |
| - } |
120 |
| - |
121 |
| - /** |
122 |
| - * Returns a comparator to sort points by their polar order relative to this point. |
123 |
| - * |
124 |
| - * @return A polar order comparator |
125 |
| - */ |
126 |
| - public Comparator<Point> polarOrder() { |
127 |
| - return new PolarOrder(); |
128 |
| - } |
129 |
| - |
130 |
| - private final class PolarOrder implements Comparator<Point> { |
131 |
| - @Override |
132 |
| - public int compare(Point p1, Point p2) { |
133 |
| - int dx1 = p1.x - x; |
134 |
| - int dy1 = p1.y - y; |
135 |
| - int dx2 = p2.x - x; |
136 |
| - int dy2 = p2.y - y; |
137 |
| - |
138 |
| - if (dy1 >= 0 && dy2 < 0) { |
139 |
| - return -1; // p1 above p2 |
140 |
| - } else if (dy2 >= 0 && dy1 < 0) { |
141 |
| - return 1; // p1 below p2 |
142 |
| - } else if (dy1 == 0 && dy2 == 0) { // Collinear and horizontal |
143 |
| - return Integer.compare(dx2, dx1); |
144 |
| - } else { |
145 |
| - return -orientation(Point.this, p1, p2); // Compare orientation |
146 |
| - } |
147 |
| - } |
148 |
| - } |
149 |
| - |
150 |
| - /** |
151 |
| - * @return A string representation of this point in the format (x, y) |
152 |
| - */ |
153 |
| - @Override |
154 |
| - public String toString() { |
155 |
| - return String.format("(%d, %d)", x, y); |
156 |
| - } |
157 |
| - } |
158 | 68 | }
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