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{{ | {{PageParameters}} | ||
* {{Parameter|y}} is the vertical axis position (row) as a positive, zero or negative floating point value. | * {{Parameter|y}} is the vertical axis position (row) as a positive, zero or negative floating point value. | ||
* {{Parameter|x}} is the horizontal axis position (column) as a positive, zero or negative floating point value. | * {{Parameter|x}} is the horizontal axis position (column) as a positive, zero or negative floating point value. | ||
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::* _ATAN2(y, x) = [[ATN]](y# / x#) + [[_PI]] when x < 0 | ::* _ATAN2(y, x) = [[ATN]](y# / x#) + [[_PI]] when x < 0 | ||
::* _ATAN2(y, x) = [[_PI]] / 2 when x = 0 | ::* _ATAN2(y, x) = [[_PI]] / 2 when x = 0 | ||
* The [[DOUBLE]] radian angle returned is 0 when x > 0 and [[_PI]] when x < 0 where y = 0 | * The [[DOUBLE]] radian angle returned is 0 when x > 0 and [[_PI]] when x < 0 where y = 0 | ||
* The [[DOUBLE]] radian angle returned is '''negative''' for lower 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#) when x > 0 | ||
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* _ATAN2(0, 0) is undefined and the function returns 0 instead of a division error. | * _ATAN2(0, 0) is undefined and the function returns 0 instead of a division error. | ||
=== Errors === | |||
* With [[ATN]](y / x), x can never be 0 as that would create a Division by Zero [[ERROR Codes|error]] 11 or #IND. | * With [[ATN]](y / x), x can never be 0 as that would create a Division by Zero [[ERROR Codes|error]] 11 or #IND. | ||
{{PageSeeAlso}} | {{PageSeeAlso}} | ||
* [[ATN]] {{ | * [[ATN]] {{Text|(arctangent)}} | ||
* [[_PI]] {{ | * [[_PI]] {{Text|(QB64 function)}} | ||
* [[Mathematical Operations]] | * [[Mathematical Operations]] | ||
* [ | * [[Wikipedia:Atan2|Atan2 reference]] | ||
{{PageNavigation}} | {{PageNavigation}} | ||
Latest revision as of 16:28, 14 June 2024
The _ATAN2 function returns the radian angle between the positive x-axis of a plane and the point given by the coordinates (x, y).
Syntax
- angle! = _ATAN2(y, x)
Parameters
- y is the vertical axis position (row) as a positive, zero or negative floating point value.
- x is the horizontal axis position (column) as a positive, zero or negative floating point value.
Description
- The DOUBLE radian angle returned is positive for upper row values where y > 0.
- The DOUBLE radian angle returned is 0 when x > 0 and _PI when x < 0 where y = 0
- The DOUBLE radian angle returned is negative for lower row values where y < 0.
- _ATAN2(0, 0) is undefined and the function returns 0 instead of a division error.
Errors
See also
- ATN (arctangent)
- _PI (QB64 function)
- Mathematical Operations
- Atan2 reference