mirror of https://gitea.it/1414codeforge/gear
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.4 KiB
Lua
59 lines
1.4 KiB
Lua
--- Utility functions to manipulate colors.
|
|
--
|
|
-- Colors are represented as RGB or RGBA, each channel
|
|
-- with values in range [0, 1].
|
|
--
|
|
-- @module gear.color
|
|
-- @copyright 2023 The DoubleFourteen Code Forge
|
|
-- @author Lorenzo Cogotti
|
|
|
|
local Color = {}
|
|
|
|
|
|
--- Darken RGB color by the specified amount.
|
|
--
|
|
-- @number r red channel
|
|
-- @number g green channel
|
|
-- @number b blue channel
|
|
-- @number amount darken factor, must be in [0,1] range.
|
|
function Color.darken(r, g, b, amount)
|
|
r = r * (1 - amount)
|
|
g = g * (1 - amount)
|
|
b = b * (1 - amount)
|
|
|
|
return r, g, b
|
|
end
|
|
|
|
--- Lighten RGB color by the specified amount.
|
|
--
|
|
-- @number r red channel
|
|
-- @number g green channel
|
|
-- @number b blue channel
|
|
-- @number amount lightening factor, must be in [0,1] range.
|
|
function Color.lighten(r, g, b, amount)
|
|
r = r + (1 - r) * amount
|
|
g = g + (1 - g) * amount
|
|
b = b + (1 - b) * amount
|
|
|
|
return r, g, b
|
|
end
|
|
|
|
--- Given two RGB colors, calculate fade by the specified amount.
|
|
--
|
|
-- @number cr first color, red channel
|
|
-- @number cg first color, green channel
|
|
-- @number cb first color, blue channel
|
|
-- @number ar second color, red channel
|
|
-- @number ag second color, green channel
|
|
-- @number ab second color, blue channel
|
|
-- @number amount fading factor, must be in [0,1] range.
|
|
function Color.fade(cr, cg, cb, ar, ag, ab, amount)
|
|
cr = cr + (ar - cr) * amount
|
|
cg = cg + (ag - cg) * amount
|
|
cb = cb + (ab - cb) * amount
|
|
|
|
return cr, cg, cb
|
|
end
|
|
|
|
return Color
|