在Java中是否有类似Rectangle类的圆类 [英] Is there a circle class in Java like the Rectangle class

问题描述

嘿，我正在编写一个快速程序，遇到需要使用圆圈进行碰撞检测的地方。但据我所知，只有Rectangle类具有.intersects（Point p）方法。有没有像我可以用同样方式使用的圆圈？

Hey I was writing a quick program and something came across where I need to use a circle for collision detection. But as far as I know, there is only the Rectangle class that has the .intersects(Point p) method. Is there anything like a circle that I could use the same way?

推荐答案

有一个名为 Ellipse2D c $ c> java.awt.geom 您可以使用的包，因为它有一些看起来像您正在寻找的方法。宽度等于其高度的椭圆是一个圆圈。

There is a class called Ellipse2D in the java.awt.geom package that you can use, since it has some methods that appears to be what you're looking for. An ellipse with a width equal to its height is a circle.

包含的重载之一允许您测试圆点碰撞：

One of the overloads for contains allows you to test for circle-point collisions:

boolean contains(double x, double y) 

测试指定的坐标是否在
Shape的边界内，如内部性定义所述。

Tests if the specified coordinates are inside the boundary of the Shape, as described by the definition of insideness.

另一个名为的函数相交允许你测试圆矩形碰撞：

Another function called intersects allows you to test for circle-rectangle collisions:

boolean intersects(double x, double y, double w, double h)

测试 Shape 与指定矩形区域的内部相交。

Tests if the interior of the Shape intersects the interior of a specified rectangular area.

请注意 Ellipse2D 是一个抽象类;你会使用它的一个嵌套子类 Ellipse2D.Double 或 Ellipse2D.Float ，唯一的区别是使用的数据类型存储尺寸。

Note that Ellipse2D is an abstract class; you would use one of its nested subclasses Ellipse2D.Double or Ellipse2D.Float, the only difference being the data type used to store the dimensions.

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