finding angles 0-360

Question

Need help with a math issue: i need to get the true angle from 0 degrees using x and y cordinates im using this at the moment:

Math.atan((x2-x1)/(y1-y2))/(Ma         


        

Answer 1

function angle(x1,y1,x2,y2)
{
eangle = Math.atan((x2-x1)/(y1-y2))/(Math.PI/180)
if ( angle > 0 )
{
  if (y1 < y2)
    return angle;
  else
    return 180 + angle;
} else {
  if (x1 < x2)
    return 180 + angle;
  else
    return 360 + angle;
}
}