计算角度是否在两个角度之间 [英] Calculating if an angle is between two angles

问题描述

所以我正在做一个小游戏，我在检查一个角色是否可以看到"另一个角色，如果A在B的一定距离内，并且A方向为+/-，则角色A可以看到角色B.面对B的45度角.

So I am making a little game where I am checking if a character can "see" another where character A can see character B if A is within a certain distance of B, and the direction in degrees of A is +/- 45 degrees of the angle B is facing.

目前，我正在做一些计算，以检查

Currently, I do a little calculation where I'm checking if

(facingAngle - 45) =< angleOfTarget =< (facingAngle + 45)

这很好，除非我们越过360度线.

This works fine except for when we cross the 360 degree line.

比方说facingAngle = 359, angleOfTarget = 5.在这种情况下，目标偏离中心仅6度，因此我希望函数返回true.不幸的是，5不在314和404之间.

Let's say facingAngle = 359, angleOfTarget = 5. In this situation, the target is only 6 degrees off center, so I want my function to return true. Unfortunately, 5 is not between 314 and 404.

推荐答案

只需尝试

anglediff = (facingAngle - angleOfTarget + 180 + 360) % 360 - 180

if (anglediff <= 45 && anglediff>=-45) ....

原因是尽管由于包裹效应，角度差异仍为facingAngle - angleOfTarget，可能会相差360度.

The reason is that the difference in angles is facingAngle - angleOfTarget although due to wrapping effects, might be off by 360 degrees.

相加180 + 360，然后对360取模，然后相减180，实际上只是将所有内容转换为-180至180度(通过相加或相减360度).

The add 180+360 then modulo 360 then subtract 180, effectively just converts everything to the range -180 to 180 degrees (by adding or subtracting 360 degrees).

然后，您可以轻松地检查角度差，它是否在-45到45度之间.

Then you can check the angle difference easily, whether it is within -45 to 45 degrees.

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