使用由WorkMail事件调用的AWS Lambda调用外部Web Api REST端点(Call an external Web Api REST endpoint using AWS Lambda invoked by a WorkMail event)

 这取决于您的角度是指定顺时针还是逆时针方向的旋转。 如果您正朝着坦克炮塔的方向看，如果您需要顺时针旋转炮塔以尽快指向它，则在右侧有一个物体，如果您需要逆时针旋转，则在左侧。 
 
 显然，你可以在相反的方向旋转以“走很远”：如果一个物体向右10度，那么你可以顺时针旋转10度或逆时针旋转350度指向它。 但是，假设沿顺时针方向指定角度，我们只考虑短路： 
 
// returns 1 if otherAngle is to the right of sourceAngle,
//         0 if the angles are identical
//         -1 if otherAngle is to the left of sourceAngle
int compareAngles(float sourceAngle, float otherAngle)
{
    // sourceAngle and otherAngle should be in the range -180 to 180
    float difference = otherAngle - sourceAngle;

    if(difference < -180.0f)
        difference += 360.0f;
    if(difference > 180.0f)
        difference -= 360.0f;

    if(difference > 0.0f)
        return 1;
    if(difference < 0.0f)
        return -1;

    return 0;
}
 
 减去角度后，结果可以在-360（-180减180）到360（180减-180）的范围内。 您可以通过加或减360度将它们带到-180到180的范围内，然后比较为零并返回结果。 
 
 绝对值在180和360之间的角度对应于“长途”旋转，并且加或减360将它们转换为“短路”。 例如顺时针-350度，长距离（即逆时针350度）加360等于顺时针方向10度。 
 
 如果以逆时针方向指定角度，则返回值的含义相反（1表示左，-1表示右） 

It depends on whether your angles specify a rotation in the clockwise or anti-clockwise direction. If you are looking in the direction of the tank turret, then an object is on the right if you need to rotate the turret clockwise to point at it as quickly as possible, and on the left if you need to rotate anti-clockwise.
 
Obviously, you can rotate in the opposite direction to go "the long way around": if an object is 10 degrees to the right then you can either rotate 10 degrees clockwise or 350 degrees anti-clockwise to point at it. But let's consider only the short way around, assuming that angles are specified in a clockwise direction:
 
// returns 1 if otherAngle is to the right of sourceAngle,
//         0 if the angles are identical
//         -1 if otherAngle is to the left of sourceAngle
int compareAngles(float sourceAngle, float otherAngle)
{
    // sourceAngle and otherAngle should be in the range -180 to 180
    float difference = otherAngle - sourceAngle;

    if(difference < -180.0f)
        difference += 360.0f;
    if(difference > 180.0f)
        difference -= 360.0f;

    if(difference > 0.0f)
        return 1;
    if(difference < 0.0f)
        return -1;

    return 0;
}
 
After subtracting the angles, the result can be in the range of -360 (-180 minus 180) to 360 (180 minus -180). You can bring them into the range of -180 to 180 by adding or subtracting 360 degrees, then compare to zero and return the result.
 
Angles with an absolute value between 180 and 360 correspond to the "long way around" rotations, and adding or subtracting 360 converts them to the "short way around". For example -350 degrees clockwise the long way around (i.e. 350 degrees anti-clockwise) plus 360 equates to 10 degrees clockwise the short way around.
 
If the angles are specified in an anti-clockwise direction, then the meaning of the return value is reversed (1 means left, -1 means right)