计算两个坐标之间的角度？ Python

Question

Say you have two coordinates within a range of 0.0 till 1.0. A: (0.12, 0.75) B: (0.43, 0.97) And you want to walk from point A to point B. How would you calculate the angle in python.Where north is 0 and south is 180.

Answer 1

if you want to get it from North then here you go:

def get_angle(x1,y1,x2,y2):
    return math.degrees(math.atan2(y2-y1, x2-x1))

This works because

tan(x) = Opposite/Adjacent;
Opposite/Adjacent = (x2-x1)/(y2-y1);
x=atan(x2-x1, y2-y1)

With atan being the inverse of tan . And to not just get the orientation, but true direction, we use the atan2 function instead, as that can get use angels from -pi (-180) to +pi (180), whereas atan can only yield values between -pi/2 (-90) and pi/2 (90).

One gotcha: the argument order for atan2 is the y difference first , so it's atan2(dy, dx) , not atan2(dx, dy) .

Answer 2

I would calculate the diference in x and the diference in y and use the function math.atan2(y/x) from the math module. Then it's just a matter of converting from radians to degrees and add 90º.