PHP 5.6.0beta1 released

atan

(PHP 4, PHP 5)

atanArkustangens

Beschreibung

float atan ( float $arg )

Berechnet den Arkustangens von arg. atan() ist die Komplementärfunktion zu tan(), d.h. für alle Werte im Wertebereich von atan() gilt a==tan(atan(a)).

Parameter-Liste

arg

Der zu verarbeitende Wert

Rückgabewerte

Der Arkustangens von arg in Bogenmaß.

Siehe auch

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User Contributed Notes 2 notes

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darren_wheatley at hotmail dot com
10 years ago
Arc Tan curve manipulation.

I used this formula to help with increasing and then diminishing return for y given an increasing x for a game.

Ie: Food production (output) is y. Food research is x.

The more research you put into x the more you produce, however after a certain point you get less reward.

 y = atan(x - pi()) + pi()/2;

The + pi()/2 moves it up the y axis so you'd add more if you want it to start higher.

The x - pi() moves it to the right so you'd minus more to move it more.

If you want stretched along the y axis change it to 2 * atan( ...... )

Dunno how useful it is... but it's there.

Daz
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joelperr at kiwi-interactif dot com
8 years ago
to obtain the direction of the line, you are better to use the <? atan2((y2-y1)/(x2-x1)) ?> function, since the regular atan function will only return arguments in the half-plane, ie. if y2-y1 and x2-x1 are negative, atan will give you an angle measurement less than 90 degrees, while it really should be  between 180 and 270
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