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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 x-axis. 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 y-coordinate of the point is the first parameter and the x-coordinate is the second due the the structure of calculating the tangent.
Syntax |
    atan2(y, x);
Parameters |

x | int or float: x-coordinate of the point
y | int or float: y-coordinate of the point

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

Updated on July 07, 2011 11:07:50pm PDT