Jmaa/colors
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interpolate_rgb can now handle alpha channels well.

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This commit is contained in:
Jon Michael Aanes 2017-11-04 17:17:35 +01:00
parent de32427601
commit 541aff4d13
1 changed files with 7 additions and 1 deletions
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8
colors.lua
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@ -83,7 +83,13 @@ end
-- Interpolation
colors.interpolate_rgb = function (c1, c2, t)
return { c1[1]+(c2[1]-c1[1])*t, c1[2]+(c2[2]-c1[2])*t, c1[3]+(c2[3]-c1[3])*t }
assert(type(c1) == 'table' and type(c1[1]) == 'number' and type(c1[2]) == 'number' and type(c1[3]) == 'number' and (type(c1[4]) == 'number' or c1[4] == nil))
assert(type(c2) == 'table' and type(c2[1]) == 'number' and type(c2[2]) == 'number' and type(c2[3]) == 'number' and (type(c2[4]) == 'number' or c2[4] == nil))
assert(type(t) == 'number')
--
local alpha = nil
if c1[4] or c2[4] then alpha = (c1[4] or 255) + ((c2[4] or 255)-(c1[4] or 255))*t end
return { c1[1]+(c2[1]-c1[1])*t, c1[2]+(c2[2]-c1[2])*t, c1[3]+(c2[3]-c1[3])*t, alpha }
end
local function angle_delta (a1, a2)