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src/main/java/br/com/rafael/math/geometry/plane/Circle.java

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+package br.com.rafael.math.geometry.plane;
+/**
+ * Copyright© 2020 Victor Rafael Pereira Alves This file is part of MathUtils.
+ *
+ * <p>MathUtils is free software: you can redistribute it and/or modify it under the terms of the
+ * Lesser GNU General Public License as published by the Free Software Foundation, either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * <p>MathUtils is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+ * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Lesser
+ * GNU General Public License for more details.
+ *
+ * <p>You should have received a copy of the Lesser GNU General Public License along with MathUtils.
+ * If not, see &#60;https://www.gnu.org/licenses/&#62;.
+ */
+import br.com.rafael.math.geometry.plane.Circle;
+import br.com.rafael.math.geometry.plane.Point2D;
+
+import java.io.Serializable;
+
+public class Circle implements Cloneable, Comparable<Circle>, Serializable {
+
+  private static final long serialVersionUID = 0l;
+
+  private Point2D _point;
+  private double _radius;
+
+  public Circle() {
+    _point = new Point2D();
+    _radius = 0;
+  }
+
+  public Circle(double radius) {
+    this(0, 0, radius);
+  }
+
+  public Circle(double x, double y) {
+    this(x, y, 0);
+  }
+
+  public Circle(double x, double y, double radius) {
+    this(new Point2D(x, y), radius);
+  }
+
+  public Circle(Point2D point) {
+    this(point, 0);
+  }
+
+  public Circle(Point2D point, double radius) {
+    _point = point;
+    _radius = radius;
+  }
+
+  public void setX(double x) {
+    _point.setX(x);
+  }
+
+  public void setY(double y) {
+    _point.setY(y);
+  }
+
+  public double getX() {
+    return _point.getX();
+  }
+
+  public double getY() {
+    return _point.getY();
+  }
+
+  public void setPosition(float x, float y) {
+    _point = new Point2D(x, y);
+  }
+
+  public Point2D getPosition() {
+    return _point.clone();
+  }
+
+  public void setRadius(double r) {
+    _radius = r;
+  }
+
+  public double getRadius() {
+    return _radius;
+  }
+
+  public double getArea() {
+    return _radius * _radius * Math.PI;
+  }
+
+  public double getPerimeter() {
+    return _radius * Math.PI * 2;
+  }
+
+  public boolean isCollide(Circle other) {
+    return _point.distance(other._point) < _radius + other._radius;
+  }
+
+  public boolean isCollide(Point2D point) {
+    return _point.distance(point) < _radius;
+  }
+
+  @Override
+  public Circle clone() {
+    try {
+      Circle clone = (Circle) super.clone();
+      clone._point = _point.clone();
+
+      return clone;
+    } catch (CloneNotSupportedException e) {
+      throw new AssertionError();
+    }
+  }
+
+  @Override
+  public int compareTo(Circle other) {
+    return (int) (_radius - other._radius);
+  }
+
+  @Override
+  public boolean equals(Object other) {
+    if (this == other) return true;
+    if (!(other instanceof Circle)) return false;
+    Circle circle = (Circle) other;
+    return this._radius == circle._radius && this._point.equals(circle._point);
+  }
+
+  @Override
+  public int hashCode() {
+    int result = 17;
+
+    result = result * 31 + _point.hashCode();
+    result = result * 31 + hashDouble(_radius);
+
+    return result;
+  }
+
+  public int hashDouble(double d) {
+    long longBits = Double.doubleToLongBits(d);
+
+    return (int) (longBits ^ (longBits >>> 32));
+  }
+
+  @Override
+  public String toString() {
+    return "{point: " + _point + ", radius: " + _radius + "}";
+  }
+}