Reference for Wiring version 1.0 Build 0100+ If you have a previous version, use the reference included with your software. If see any errors or have any comments, let us know.
Name  atan2() 


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 due the the structure of calculating the tangent.  
Syntax  atan2(y, x);


Parameters 


Returns  float  
Usage  Application  
Related  acos() asin() atan() atan2() cos() cosh() hypot() sin() sinh() tan() tanh() radians() degrees() 