1 /*
2 * Copyright (c) 2002-2026 Gargoyle Software Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 * https://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 package org.htmlunit.util.geometry;
16
17 /**
18 * Simple 2D circle shape.
19 *
20 * @author Ronald Brill
21 */
22 public class Circle2D implements Shape2D {
23 private final double centerX_;
24 private final double centerY_;
25 private final double radius_;
26
27 /**
28 * Creates a new circle with the given center and radius.
29 *
30 * @param centerX the x coordinate of the center
31 * @param centerY the y coordinate of the center
32 * @param radius the radius
33 */
34 public Circle2D(final double centerX, final double centerY, final double radius) {
35 centerX_ = centerX;
36 centerY_ = centerY;
37 radius_ = radius;
38 }
39
40 /**
41 * {@inheritDoc}
42 */
43 @Override
44 public boolean contains(final double x, final double y) {
45 final double offsetX = centerX_ - x;
46 final double offsetY = centerY_ - y;
47
48 return offsetX * offsetX + offsetY * offsetY <= radius_ * radius_;
49 }
50
51 /**
52 * {@inheritDoc}
53 */
54 @Override
55 public boolean isEmpty() {
56 return radius_ < EPSILON;
57 }
58
59 @Override
60 public String toString() {
61 return "Circle2D [ (" + centerX_ + ", " + centerY_ + ") radius = " + radius_ + "]";
62 }
63 }