// 判断target是否在以source为中心的朝向为facing的角度范围fov_deg里面
public static bool InsideFov(ref Vector2I source, ref Vector2I facing, int fov_deg, ref Vector2I target)
{
Vector2I to_target = target - source;
to_target.Normalize();
return(to_target.Dot(ref facing) >= IntMath.CosI(fov_deg / 2));
}
public void FromDegree(int degree)
{
//ZZWTODO 和美术资源的默认朝向相关
x = IntMath.CosI(degree);
z = IntMath.SinI(degree);
Normalize();
}