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Old 28th April 2003, 15:09   #77
UnConeD
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Join Date: Jun 2001
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About atan2... you got one detail wrong. In a mathematical coordinate system, the angle for (x,y) with regard to the positive x axis is atan(y/x), not atan(x/y).

By the way, you can imagine atan2 to be the same as this, except that atan2 can also handle the cases where x and/or y is 0:

alpha=atan(y/x)+below(x,0)*acos(-1);

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