C++ 从弧度转换为度数
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Converting from Radians to Degrees
提问by Lucy Loo
I'm building a small Physics engine and I'm having trouble converting my Radian value to Degrees using atan, as I need an angle to output in Degrees only.
我正在构建一个小型物理引擎，但无法使用 将弧度值转换atan为度数，因为我只需要一个角度以度数输出。
Firstly, I have an xand yvalue, and I need to find an angle using atan, so I divide y by x like so:
首先，我有一个xandy值，我需要使用 找到一个角度atan，所以我像这样将 y 除以 x：
angleDivide = yN / xN;
Then, before putting this value into tan, I attempt to convert it to Degrees like this:
然后，在将此值放入 之前tan，我尝试将其转换为度数，如下所示：
angleToDegrees = angleDivide * (3.14 / 180);
Then I place angleToDegrees into atan:
然后我将angleToDegrees 放入atan：
angle = atan(angleToDegrees);
But when I'm displaying angle, I'm, still getting radian values.
但是当我显示时angle，我仍然得到弧度值。
Please could you tell me what is wrong with my code and how to fix this?
请你告诉我我的代码有什么问题以及如何解决这个问题？
回答by anthonybell
You want to calculate radians=tan(y/x)first.
你想先计算radians=tan(y/x)。
Then you can convert it to degrees:
然后您可以将其转换为度数：
radians = atan(y/x)
degrees = radians * (180.0/3.141592653589793238463)
See the reference herefor atan:
On a side note, you also have to take into account what quadrant you are in to get the correct answer (since -y/xis the same number as y/-x)
附带说明一下，您还必须考虑您所在的象限才能获得正确答案（因为-y/x与 相同y/-x）
