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Revision as of 15:01, 1 March 2008 (edit) Sandman (Talk | contribs) m ← Previous diff		Current revision (15:03, 1 March 2008) (edit) (undo) Sandman (Talk | contribs) m (→Example)
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	Repeat		Repeat
	frame;		frame;
-	Until(key(_esc))	+	Until(key(_ESC))
	End		End

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Current revision

Contents 1 Definition 2 Parameters 3 Returns 4 Notes 5 Example

[edit] Definition

FLOAT sin ( <FLOAT angle> )

Returns the sine of the specified angle.

This function performs a sine calculation on a certain angle and returns a value between -1 and 1.

[edit] Parameters

FLOAT angle

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

[edit] Returns

FLOAT : The sine result of the specified angle.

[edit] 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 click on Wikipedia's Trigonometric function page.

[edit] Example

Const
    screen_width  = 320;
    screen_height = 200;
    screen_border = 15;
End

Global
    float value;
End

Process Main()
Begin

    // Modes
    set_title("Sine Graph");
    set_mode(screen_width,screen_height);

    // X axis
    for(x=1;x<=8;x++)
        write( 0,
               screen_border+x*(screen_width-screen_border)/8+3,
               screen_height-1,
               8,
               itoa(x*360/8 )+"^" );
    end
    draw_line(1,screen_height-screen_border,screen_width,screen_height-screen_border);

    // Y axis
    write(0,screen_border-1,20,5,"1");
    write(0,screen_border-1,screen_height/2,5,"0");
    write(0,screen_border-1,screen_height-20,5,"-1");
    draw_line(screen_border,1,screen_border,screen_height-1);

    // Draw tangent
    for(angle=0;angle<360;angle++)
        value=sin(angle*1000)*(screen_height/2-20);
        put_pixel( screen_border+angle*(screen_width-screen_border)/360,
                   screen_height/2-value,
                   rgb(255,255,255) );
        // screen_height/2-value because the screen's origin (0,0) is topleft instead of downleft.
    end

    Repeat
        frame;
    Until(key(_ESC))

End

Used in example: set_title(), set_mode(), write(), draw_line(), sin(), put_pixel(), key()

This will result in something like:

Sine

Math Functions

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