夏亚-雷鸣
问题描述
我正在写一个游戏.我需要知道如何将点 a 围绕点 b 旋转给定的度数.我正在用 java 写这个，它将成为我的课程的一部分，Point.
I am writing a game. I need to know how to rotate point a around point b by a given number of degrees. I am writing this in java and it is going to be part of my class, Point.
推荐答案
double x1 = point.x - center.x; double y1 = point.y - center.y; double x2 = x1 * Math.cos(angle) - y1 * Math.sin(angle)); double y2 = x1 * Math.sin(angle) + y1 * Math.cos(angle)); point.x = x2 + center.x; point.y = y2 + center.y;
这种方法使用旋转矩阵.point"是你的a点，center"是你的b点.
This approach uses rotation matrices. "point" is your point a, "center" is your point b.
