This wiki is out of date, use the continuation of this wiki instead

From FenixWiki

Revision as of 23:56, 8 July 2007 (edit) Sandman (Talk | contribs) m ← Previous diff		Current revision (16:06, 1 March 2008) (edit) (undo) Sandman (Talk | contribs) m (→Definition)
(2 intermediate revisions not shown.)
Line 7:		Line 7:
	Returns the tangent of a certain [[angle]].		Returns the tangent of a certain [[angle]].
-	This [[function]] performs a tangent calculation on a certain angle and returns a value between -1 and 1.	+	This [[function]] performs a tangent calculation on a certain angle and returns a value.
	== Parameters ==		== Parameters ==
Line 21:		Line 21:
	To read about all aspects of trigonometry, you can visit Wikipedia's [http://en.wikipedia.org/wiki/Trigonometric_function Trigonometric function] page.		To read about all aspects of trigonometry, you can visit Wikipedia's [http://en.wikipedia.org/wiki/Trigonometric_function Trigonometric function] page.
		+
		+	== Example ==
		+	<pre>
		+	Const
		+	screen_width = 320;
		+	screen_height = 200;
		+	screen_border = 15;
		+	End
		+
		+	Global
		+	float value;
		+	End
		+
		+	Process Main()
		+	Begin
		+
		+	// Modes
		+	set_title("Tangent 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=tan(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
		+	</pre>
		+	Used in example: [[set_title]](), [[set_mode]](), [[write]](), [[draw_line]](), [[tan]](), [[put_pixel]](), [[key]]()
		+
		+	This will result in something like:<br />
		+	{{Image
		+	| image = Tan.png
		+	| caption = Tangent
		+	}}
		+
		+	{{Funcbox
		+	| category = Math
		+	}}

---

Current revision

Contents 1 Definition 2 Parameters 3 Returns 4 Notes 5 Example

[edit] Definition

FLOAT tan ( <FLOAT angle> )

Returns the tangent of a certain angle.

This function performs a tangent calculation on a certain angle and returns a value.

[edit] Parameters

FLOAT angle

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

[edit] Returns

FLOAT : The tangent 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 visit 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("Tangent 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=tan(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(), tan(), put_pixel(), key()

This will result in something like:

Tangent

Math Functions

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