Calculating the angle between the line defined by two points

Question

I\'m currently developing a simple 2D game for Android. I have a stationary object that\'s situated in the center of the screen and I\'m trying to get that object to rotate

Answer 1

with pygame:

dy = p1.y - p2.y
dX = p2.x - p1.x

rads = atan2(dy,dx)
degs = degrees(rads)
if degs < 0 :
   degs +=90

it work for me