查看“LlAcos”的源代码

{{LSL Header|ml=*}}{{LSLC|Keywords}}{{LSLC|Flow Control}}{{LSLC|}}


{{函数详情
|函数名=Function: float llAcos( float val );
|参数= 参数：float val –must fall in the range [-1.0, 1.0]
|返回值= 返回值：Returns a float that is the arccosine in radians of val.


|注意事项=无


|示例=
示例1
<pre>
//  This example exercises the full valid range of argument from -1.0 to +1.0
 
default
{
    touch_start(integer num_detected)
    {
        float random = llFrand(2.0) - 1.0;
 
        llOwnerSay("The arccosine of " + (string)random + " is " + (string)llAcos(random));
    }
}
</pre>

示例2
<pre>
//An example for the Law of Cosines to calculate any angle of a triangle from 3 known side lengths.
 
default
{
    touch_start(integer num_detected)
    {        
        vector t=< llFrand(9.0)+1.0 , llFrand(9.0)+1.0 , llFrand(9.0)+1.0 >; //the 3 values of this vector are used to set the lengths of 3 sides of a triangle.
 
        float anglexy=llAcos( (t.x*t.x+t.y*t.y-(t.z*t.z)) / ( 2*t.x*t.y) ) //Law Of Cosines
 
        llOwnerSay("Using the Law Of Cosines, the angle of a triangle between side a="+(string)t.x+"and side b="+(string)t.y+"is = "+(string)anglexy+" radians="+(string)(anglexy*RAD_TO_DEG)+"° and that angle is not on side c="+(string)t.z);
    }
}
</pre>

|相关函数=
[[llSin]] [[llAsin]] –sine & inverse Sine	
[[llCos]]	–cosine	
[[llTan]]	[[llAtan2]]	–tangent & inverse tangent
}}