Java AWT 矩形交集

Question

我有两个矩形:

Rectangle rectZR = new Rectangle(513, 163, 38, 39); //(x,y,width,height)
Rectangle rectCorrect = new Rectangle(76, 206, 44, 44);

我这样做:

Rectangle intersect = rectZR.intersection(rectCorrect);

如坐标所示，这两个矩形实际上不相交，但 Java 仍然返回我一个交集并且 intersect 具有以下维度(x，y，宽度，高度):

513, 206, -393, -4

这是一个错误，还是我做错了什么？

Answer 1

JavaDoc关于相交方法状态:

Computes the intersection of this Rectangle with the specified Rectangle. Returns a new Rectangle that represents the intersection of the two rectangles. If the two rectangles do not intersect, the result will be an empty rectangle.

虽然整个类的 JavaDoc 指定:

A Rectangle whose width or height is negative has neither location nor dimension along those axes with negative dimensions. Such a Rectangle is treated as non-existant along those axes. Such a Rectangle is also empty with respect to containment calculations and methods which test if it contains or intersects a point or rectangle will always return false. Methods which combine such a Rectangle with a point or rectangle will ignore the Rectangle entirely in generating the result. If two Rectangle objects are combined and each has a negative dimension, the result will have at least one negative dimension.

因此，由两个负维度相交创建的矩形实际上意味着没有交集。您可以使用 intersects() 方法进行检查:

boolean intersects = rectZR.intersects(rectCorrect);