ATN: Difference between revisions
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{{PageParameters}} | {{PageParameters}} | ||
* The return is the {{Parameter|tangent!}}'s angle in '''radians'''. | * The return is the {{Parameter|tangent!}}'s angle in '''radians'''. | ||
* {{Parameter|tangent!}} [[SINGLE]] or [[DOUBLE]] values are used by the function. EX:'''{{ | * {{Parameter|tangent!}} [[SINGLE]] or [[DOUBLE]] values are used by the function. EX:'''{{Text|Pi <nowiki>=</nowiki> 4 * ATN(1)|green}}''' | ||
{{PageDescription}} | {{PageDescription}} | ||
* To convert from radians to degrees, multiply radians * (180 / π). | * To convert from radians to degrees, multiply radians * (180 / π). | ||
* The ''tangent'' value would be equal to the tangent value of an angle. Ex: '''{{ | * The ''tangent'' value would be equal to the tangent value of an angle. Ex: '''{{Text|[[TAN]](ATN(1)) <nowiki>=</nowiki> 1|green}}''' | ||
* The function return value is between -π / 2 and π / 2. | * The function return value is between -π / 2 and π / 2. | ||
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{{Cl|END IF}} | {{Cl|END IF}} | ||
{{Cl|END FUNCTION}} | {{Cl|END FUNCTION}} | ||
{{CodeEnd}}{{ | {{CodeEnd}} | ||
{{Small|Function by Galleon}} | |||
{{PageSeeAlso}} | {{PageSeeAlso}} | ||
* [[_PI]] {{ | * [[_PI]] {{Text|(QB64 function)}} | ||
* [[TAN]] {{ | * [[TAN]] {{Text|(tangent function)}} | ||
* [[SIN]], [[COS]] | * [[SIN]], [[COS]] | ||
* [[Mathematical Operations]] | * [[Mathematical Operations]] | ||
Revision as of 22:13, 11 February 2023
The ATN or arctangent function returns the angle in radians of a numerical tangent value.
Syntax
- radianAngle = ATN(tangent!)
Parameters
- The return is the tangent!'s angle in radians.
- tangent! SINGLE or DOUBLE values are used by the function. EX:Pi = 4 * ATN(1)
Description
- To convert from radians to degrees, multiply radians * (180 / π).
- The tangent value would be equal to the tangent value of an angle. Ex: TAN(ATN(1)) = 1
- The function return value is between -π / 2 and π / 2.
Examples
Example 1: When the TANgent value equals 1, the line is drawn at a 45 degree angle (.7853982 radians) where SIN / COS = 1.
SCREEN 12 x = 100 * COS(ATN(1)) y = 100 * SIN(ATN(1)) LINE (200, 200)-(200 + x, 200 + y) |
Example 2: ATN can be used to define π in SINGLE or DOUBLE precision. The calculation cannot be used as a CONSTant.
Pi = 4 * ATN(1) 'SINGLE precision Pi# = 4 * ATN(1#) 'DOUBLE precision PRINT Pi, Pi# |
- Note: You can use QB64's native _PI function.
Example 3: Finds the angle from the center point to the mouse pointer.
SCREEN _NEWIMAGE(640, 480, 32) x1! = 320 y1! = 240 DO PRESET (x1!, y1!), _RGB(255, 255, 255) dummy% = _MOUSEINPUT x2! = _MOUSEX y2! = _MOUSEY LINE (x1, y1)-(x2, y2), _RGB(255, 0, 0) LOCATE 1, 1: PRINT getangle(x1!, y1!, x2!, y2!) _DISPLAY _LIMIT 200 CLS LOOP UNTIL INKEY$ <> "" END FUNCTION getangle# (x1#, y1#, x2#, y2#) 'returns 0-359.99... IF y2# = y1# THEN IF x1# = x2# THEN EXIT FUNCTION IF x2# > x1# THEN getangle# = 90 ELSE getangle# = 270 EXIT FUNCTION END IF IF x2# = x1# THEN IF y2# > y1# THEN getangle# = 180 EXIT FUNCTION END IF IF y2# < y1# THEN IF x2# > x1# THEN getangle# = ATN((x2# - x1#) / (y2# - y1#)) * -57.2957795131 ELSE getangle# = ATN((x2# - x1#) / (y2# - y1#)) * -57.2957795131 + 360 END IF ELSE getangle# = ATN((x2# - x1#) / (y2# - y1#)) * -57.2957795131 + 180 END IF END FUNCTION |
See also
- _PI (QB64 function)
- TAN (tangent function)
- SIN, COS
- Mathematical Operations
- Derived Mathematical Functions