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const getOffset = (radius: number): number => {
if (radius === 0) {
return 0;
}
// 如果要考虑通用性,这里应该用三角函数 Math.sin(45)
// 但是这个场景比较特殊,始终是等腰直角三角形,所以直接用 Math.sqrt() 开方即可
return radius - Math.sqrt(radius ** 2 / 2);
};
export default getOffset;