PHP Australia Conference 2015

acos

(PHP 4, PHP 5)

acosArkuskosinus

Beschreibung

float acos ( float $arg )

Berechnet den Arkuskosinus des Parameters arg. acos() ist die Komplementärfunktion zu cos(), d.h. innerhalb des Wertebereichs von acos() gilt a==cos(acos(a)).

Parameter-Liste

arg

Der zu verarbeitende Wert

Rückgabewerte

Der Arkuskosinus von arg in Bogenmaß

Siehe auch

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User Contributed Notes 1 note

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zoltan dot szentesi at nokia dot com
8 years ago
Wondering what is the use of 'acos' function?

It is essential in games, animations and drawings to determine the location of two objects relating to each other.

To the point: the angle of two vectors is calculated by

           v1X*v2X + v1Y*v2Y
  acos(--------------------------)=angle between two vectors.
               |v1| * |v2|

|v1| and |v2| are the length of the vectors and calculated using Pithagoras-formula: |v1|=sqrt(v1X*v1X + v1Y*v1Y)

This helped me to calculate and share given space for 'n' amount of objects so that they don't overlap.

Enjoy! :-)
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