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	'''FLOAT''' cos ( <'''FLOAT''' angle> )		'''FLOAT''' cos ( <'''FLOAT''' angle> )
-	Returns the cosine of a specified [[angle]].	+	Returns the cosine of the specified [[angle]].
-	This [[function]] performs a cosine calculation on a specified [[angle]] and returns the value as a [[floating point]] number between -1 and 1.	+	This [[function]] performs a cosine calculation on the specified angle and returns the value as a [[floating point]] number between -1 and 1.
	== Parameters ==		== Parameters ==
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	== Notes ==		== Notes ==
-	The [[angle]] value used in this [[function]] should be in thousandths of degrees, as most angles within [[Fenix]] are, and will return a [[floating point]] value between -1 and 1.	+	The [[angle]] value used in this function should be in thousandths of degrees, as most angles within [[Fenix]] are, and will return a [[floating point]] value between -1 and 1.
	To read about all aspects of trigonometry, you can click on Wikipedia's [http://en.wikipedia.org/wiki/Trigonometric_function Trigonometric function] page.		To read about all aspects of trigonometry, you can click on Wikipedia's [http://en.wikipedia.org/wiki/Trigonometric_function Trigonometric function] page.
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	== Example ==		== Example ==
	<pre>		<pre>
-	program example_cos;	+	Program example_cos;
-	global	+	Global
	float value;		float value;
-	begin	+	Begin
	set_title("Cosine Graph");		set_title("Cosine Graph");
	set_mode(825,480);		set_mode(825,480);
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	end		end
-	repeat	+	Repeat
-	frame;	+	frame;
-	until(key(_esc))	+	Until(key(_esc))
-	end	+
-	</pre>	+
		+	End
		+	</pre>
		+	Used in example: [[set_title]](), [[set_mode]](), [[write]](), [[draw_line]](), [[put_pixel]](), [[key]]()
	This will result in something like:<br />		This will result in something like:<br />
	http://wwwhome.cs.utwente.nl/~bergfi/fenix/wiki/cos.PNG		http://wwwhome.cs.utwente.nl/~bergfi/fenix/wiki/cos.PNG

---

Revision as of 00:51, 8 June 2007

Contents 1 Definition 2 Parameters 3 Returns 4 Notes 5 Example

Definition

FLOAT cos ( <FLOAT angle> )

Returns the cosine of the specified angle.

This function performs a cosine calculation on the specified angle and returns the value as a floating point number between -1 and 1.

Parameters

FLOAT angle

- Angle, in thousandths of degrees. i.e. 75000 = 75º

Returns

FLOAT : The cosine result of the specified angle.

Notes

The angle value used in this function should be in thousandths of degrees, as most angles within Fenix are, and will return a floating point value between -1 and 1.

To read about all aspects of trigonometry, you can click on Wikipedia's Trigonometric function page.

Example

Program example_cos;
Global
    float value;
Begin
    set_title("Cosine Graph");
    set_mode(825,480);
    
    for(x=50;x<=800;x+=50)
        write(0,x,479,6,itoa(x*360/800));
    end
    
    write(0,1,20,3,"1");
    write(0,1,240,3,"0");
    write(0,1,460,3,"-1");
    
    draw_line(15,1,15,479);
    draw_line(1,470,824,470);
    
    for(angle=0;angle<360;angle++)
        value=cos(angle*1000)*220;
        put_pixel(angle*800/360,240+value,rgb(255,255,255));
    end

    Repeat
        frame;
    Until(key(_esc))

End

Used in example: set_title(), set_mode(), write(), draw_line(), put_pixel(), key() This will result in something like: