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	'''FLOAT''' cos ( <'''FLOAT''' angle> )		'''FLOAT''' cos ( <'''FLOAT''' angle> )
-	Returns the cosine of the specified [[angle]].	+	Returns the cosine of the specified angle.
	This [[function]] performs a cosine calculation on a certain angle and returns a value between -1 and 1.		This [[function]] performs a cosine calculation on a certain angle and returns a value between -1 and 1.
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	Repeat		Repeat
	frame;		frame;
-	Until(key(_esc))	+	Until(key(_ESC))
	End		End
	</pre>		</pre>
-	Used in example: [[set_title]](), [[set_mode]](), [[write]](), [[draw_line]](), [[put_pixel]](), [[key]]()	+	Used in example: [[set_title]](), [[set_mode]](), [[write]](), [[draw_line]](), [[cos]](), [[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
		+
		+	{{Funcbox
		+	| category = Math
		+	}}

---

Revision as of 14:25, 1 March 2008

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 a certain angle and returns a value 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.

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

Example

Program example_cos;
Global
    float value;
Begin

    // Modes
    set_title("Cosine Graph");
    set_mode(825,480);

    // X axis    
    for(x=50;x<=800;x+=50)
        write(0,x,479,6,itoa(x*360/800));
    end
    draw_line(1,470,824,470);

    // Y axis    
    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 cosine    
    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(), cos(), put_pixel(), key()

This will result in something like:

Math Functions

• Abs() • Acos() • Asin() • Atan() • Cos() • Fget_angle() • Fget_dist() • Get_distx() • Get_disty() • Pow() • Rand() • Rand_seed() • Sin() • Sqrt() • Tan() •