Difference between revisions of "ATAN2"
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* _ATAN2(y, x) = [[ATN]](y / x) + [[_PI]] when x < 0 and y >= 0 | * _ATAN2(y, x) = [[ATN]](y / x) + [[_PI]] when x < 0 and y >= 0 | ||
* _ATAN2(y, x) = [[ATN]](y / x) - [[_PI]] when x < 0 and y < 0 | * _ATAN2(y, x) = [[ATN]](y / x) - [[_PI]] when x < 0 and y < 0 | ||
| − | * _ATAN2(y | + | * _ATAN2(y, x) = [[_PI]] / 2 when x = 0 and y > 0 |
* _ATAN2(y, x) = -[[_PI]] / 2 when x = 0 and y < 0 | * _ATAN2(y, x) = -[[_PI]] / 2 when x = 0 and y < 0 | ||
* _ATAN2(0, 0) is undefined and the function returns 0 instead of an error. | * _ATAN2(0, 0) is undefined and the function returns 0 instead of an error. | ||
Revision as of 15:12, 15 November 2015
The _ATAN2 function returns the radian angle between the positive x-axis of a plane and the point given by the coordinates (x, y) on it.
Syntax
- angle! = _ATAN2( y, x)
Parameters
- y is the vertical axis position(row).
- x is the horizontal axis position(column).
Description
- The DOUBLE radian angle returned is positive for upper row values where y > 0.
- The DOUBLE radian angle returned is negative for lower row values where y < 0.
- _ATAN2(y, x) = ATN(y / x) when x > 0
- _ATAN2(y, x) = ATN(y / x) + _PI when x < 0 and y >= 0
- _ATAN2(y, x) = ATN(y / x) - _PI when x < 0 and y < 0
- _ATAN2(y, x) = _PI / 2 when x = 0 and y > 0
- _ATAN2(y, x) = -_PI / 2 when x = 0 and y < 0
- _ATAN2(0, 0) is undefined and the function returns 0 instead of an error.
Errors
See also
- ATN (arctangent)
- _PI (QB64 constant value)
- Mathematical Operations