Guix at 21:51, 16 January 2013

2013-01-16T21:51:24Z

← Older revision		Revision as of 21:51, 16 January 2013
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	__NOTOC__		__NOTOC__
	This function retrieves the ~~hex string~~ of a ~~specified color~~.		This function retrieves the RGBA components of a wavelenght.

	==Syntax==		==Syntax==

Lexr128: Created page with "{{Useful Function}} NOTOC This function retrieves the hex string of a specified color. ==Syntax== int, int, int, int waveleng..."

2012-11-04T14:52:50Z

Created page with "{{Useful Function}} <lowercasetitle></lowercasetitle> __NOTOC__ This function retrieves the hex string of a specified color. ==Syntax== <syntaxhighlight lang="lua"> int, int, int, int waveleng..."

New page

{{Useful Function}}
<lowercasetitle></lowercasetitle>
__NOTOC__
This function retrieves the hex string of a specified color.

==Syntax==
<syntaxhighlight lang="lua">
int, int, int, int wavelengthToRGBA ( int length )
</syntaxhighlight>

===Required Arguments===
* '''length :''' The wavelength of the light in nanometers.

===Returns===
Returns four color components in RGBA format.

==Code==
<section name="Function source" class="both" show="true">
<syntaxhighlight lang="lua">
function wavelengthToRGBA (length)
local r, g, b, factor
if (length >= 380 and length < 440) then
r, g, b = -(length - 440)/(440 - 380), 0, 1
elseif (length < 489) then
r, g, b = 0, (length - 440)/(490 - 440), 1
elseif (length < 510) then
r, g, b = 0, 1, -(length - 510)/(510 - 490)
elseif (length < 580) then
r, g, b = (length - 510)/(580 - 510), 1, 0
elseif (length < 645) then
r, g, b = 1, -(length - 645)/(645 - 580), 0
elseif (length < 780) then
r, g, b = 1, 0, 0
else
r, g, b = 0, 0, 0
end
if (length >= 380 and length < 420) then
factor = 0.3 + 0.7*(length - 380)/(420 - 380)
elseif (length < 701) then
factor = 1
elseif (length < 780) then
factor = 0.3 + 0.7*(780 - length)/(780 - 700)
else
factor = 0
end
return r*255, g*255, b*255, factor*255
end
</syntaxhighlight>
</section>

Author: Lex128

==See Also==
{{Useful_Functions}}

WavelengthToRGBA - Revision history

Guix at 21:51, 16 January 2013

Lexr128: Created page with "{{Useful Function}} __NOTOC__ This function retrieves the hex string of a specified color. ==Syntax== int, int, int, int waveleng..."

Lexr128: Created page with "{{Useful Function}} NOTOC This function retrieves the hex string of a specified color. ==Syntax== int, int, int, int waveleng..."