Name 
atan2() 
Examples 
def draw():
background(204)
translate(width/2, height/2)
a = atan2(mouseYheight/2, mouseXwidth/2)
rotate(a)
rect(30, 5, 60, 10)

Description 
Calculates the angle (in radians) from a specified point to the coordinate origin as measured from the positive xaxis. Values are returned as a float in the range from PI to PI. The atan2() function is most often used for orienting geometry to the position of the cursor. Note: The ycoordinate of the point is the first parameter, and the xcoordinate is the second parameter, due the the structure of calculating the tangent.

Syntax  atan2(y, x)

Parameters 
y  float: ycoordinate of the point 
x  float: xcoordinate of the point 

Related 
tan()


Updated on Sun Nov 26 15:34:42 2017.