問題描述
嘿，我正在編寫一個快速程序，但遇到了一些需要使用圓圈進行碰撞檢測的地方.但據(jù)我所知，只有 Rectangle 類具有 .intersects(Point p) 方法.有沒有類似圓圈的東西可以用同樣的方式使用?
有一個類叫Ellipse2D 在您可以使用的 java.awt.geom 包中，因為它有一些看起來像您的方法重新尋找.寬度等于高度的橢圓是圓.
contains 的其中一個重載允許您測試圓點碰撞:
boolean contains(double x, double y)測試指定的坐標是否在邊界內(nèi)Shape，正如內(nèi)在定義所描述的那樣.
另一個名為 intersects 的函數(shù)允許您測試圓與矩形的碰撞:
boolean intersects(double x, double y, double w, double h)測試 Shape 的內(nèi)部是否與指定矩形區(qū)域的內(nèi)部相交.
注意 Ellipse2D 是一個抽象類；您可以使用其中一個嵌套子類 Ellipse2D.Double 或 Ellipse2D.Float，唯一的區(qū)別是用于存儲維度的數(shù)據(jù)類型.
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?
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.
One of the overloads for contains allows you to test for circle-point collisions:
boolean contains(double x, double y)Tests if the specified coordinates are inside the boundary of the
Shape, as described by the definition of insideness.
Another function called intersects allows you to test for circle-rectangle collisions:
boolean intersects(double x, double y, double w, double h)Tests if the interior of the
Shapeintersects the interior of a specified rectangular area.
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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