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	Returns the tangent of a certain [[angle]].		Returns the tangent of a certain [[angle]].
-	This [[function]] performs a tangent calculation on the specified angle and returns the value as a [[floating point]] number between -1 and 1.	+	This [[function]] performs a tangent calculation on a certain angle and returns a value.
	== Parameters ==		== Parameters ==
Line 18:		Line 18:
	== 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.
-	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 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() •