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! :-)
acos
(PHP 4, PHP 5)
acos — 逆余弦（アークコサイン）
説明
float acos ( float $arg )arg のアークコサインをラジアンで返します。 acos() は cos() の逆関数で、 acos() がとりうる範囲内のすべての a について a==cos(acos(a)) が成立します。
パラメータ
- arg
処理する角度。
返り値
arg のアークコサインをラジアンで返します。
参考
| cos() |
| acosh() |
| asin() |
| atan() |
acos
zoltan dot szentesi at nokia dot com
06-Aug-2006 07:29
06-Aug-2006 07:29