mathvectoratan2
Angle of a vector pointing from A to B
I'm not the best in Maths, but for what I am doing now I need to calculate the angle of the vector which is shown as arrow in the picture below:
I have a point A and a point B in a 2D plane. I need to calculate the following:
- The angle in which the arrow must be rotated in order to point to B
Solution
atan2(yB-yA, xB-xA), assuming your library has atan2. Otherwise you need to use atan, which will return the correct answer if B is to the right of A, and will be 180 degrees off otherwise. Also note that the return value is in radians, you can convert radians to degrees by multiplying by 180/pi if necessary.
Wikipedia has a detailed explanation of the geometry.
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