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Revision as of 15:48, 29 May 2007

Contents 1 Definition 2 Parameters 3 Returns 4 Notes 5 Example

Definition

FLOAT cos ( <FLOAT angle> )

Returns the cosine of a 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.

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.

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<360000;angle++)
        value=cos(angle*1000)*220;
        put_pixel(angle*800/360,240+value,rgb(255,255,255));
    end

    repeat
    frame;
    until(key(_esc))
end

Image:Http://wwwhome.cs.utwente.nl/~bergfi/fenix/wiki/cos.PNG