PHP 5.5.16 is released

acos

(PHP 4, PHP 5)

acosArco coseno

Descrizione

float acos ( float $arg )

Restituisce l'arco coseno di arg in radianti. La funzione acos() รจ complementare alla funzione cos(), ovvero che a==cos(acos(a)) per ciascun valore di a nel range di acos().

Vedere anche: acosh(), asin() e atan().

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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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