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Add colorspec.from_hsv

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This commit is contained in:
Lars Mueller 2021-11-03 23:00:58 +01:00
parent f5526205cb
commit c0ea0dba47
1 changed files with 24 additions and 0 deletions
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24
minetest/colorspec.lua
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@ -172,6 +172,30 @@ end
colorspec.from_table = colorspec.new
local c_comp = { "r", "g", "g", "b", "b", "r" }
local x_comp = { "g", "r", "b", "g", "r", "b" }
function colorspec.from_hsv(
-- 0 (inclusive) to 1 (exclusive)
hue,
-- 0 to 1 (both inclusive)
saturation,
-- 0 to 1 (both inclusive)
value
)
hue = hue * 6
local chroma = saturation * value
local m = value - chroma
local color = {r = m, g = m, b = m}
local idx = 1 + floor(hue)
color[c_comp[idx]] = color[c_comp[idx]] + chroma
local x = chroma * (1 - math.abs(hue % 2 - 1))
color[x_comp[idx]] = color[x_comp[idx]] + x
color.r = floor(color.r * 255 + 0.5)
color.g = floor(color.g * 255 + 0.5)
color.b = floor(color.b * 255 + 0.5)
return colorspec.from_table(color)
end
function colorspec.from_string(string)
local hex = "#([A-Fa-f%d]+)"
local number, alpha = named_colors[string], 0xFF