HSVToColor
Example
A helper function for drawing rainbow text.
local function DrawRainbowText( frequency, str, font, x, y )
surface.SetFont( font )
for i = 1, #str do
surface.SetTextColor( HSVToColor( i * frequency % 360, 1, 1 ) )
local w = surface.GetTextSize( string.sub( str, 1, i - 1 ) )
surface.SetTextPos( x + w, y )
surface.DrawText( string.sub( str, i, i ) )
end
end
-- Solid color rainbow, faster than example above
local function DrawSimpleRainbowText( speed, str, font, x, y )
surface.SetFont( font )
surface.SetTextColor( HSVToColor( ( CurTime() * speed ) % 360, 1, 1 ) )
surface.SetTextPos( x, y )
surface.DrawText( str )
end
hook.Add( "HUDPaint", "RainbowPuke", function()
DrawRainbowText( 10, "Hello world! This is rainbow text.", "CloseCaption_Bold", 5, 5 )
DrawSimpleRainbowText( 100, "Hello world! This is rainbow text.", "CloseCaption_Bold", 5, 55 )
end )
Output: 
Example
A helper function for printing rainbow text in the chat.
local function PrintRainbowText( frequency, str )
local text = {}
for i = 1, #str do
table.insert( text, HSVToColor( i * frequency % 360, 1, 1 ) )
table.insert( text, string.sub( str, i, i ) )
end
-- Print to chat, also prints to console
chat.AddText( unpack( text ) )
-- Uncomment this to print to console only, works serverside too
-- MsgC( unpack( text ) )
end
-- The higher the number, the quicker the color will change between each character
PrintRainbowText( 10, "Hello world!" )
Output: 
Rust
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