forked from mia/Aegisub
Fix calls to other util functions from within util functions
This commit is contained in:
Thomas Goyne
parent
9bcc6efcc8
commit
1b96bf748f
2 changed files with 406 additions and 369 deletions
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@ -1,209 +1,242 @@
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local utils = {
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copy = function(tbl)
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local sformat = string.format
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local copy
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copy = function(tbl)
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return (function()
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local _tbl_0 = { }
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for k, v in pairs(tbl) do
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_tbl_0[k] = v
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end
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return _tbl_0
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end)()
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end
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local deep_copy
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deep_copy = function(tbl)
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local seen = { }
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copy = function(val)
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if type(tbl) ~= 'table' then
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return val
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end
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if seen[tbl] then
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return seen[val]
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end
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seen[val] = tbl
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return (function()
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local _tbl_0 = { }
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for k, v in pairs(tbl) do
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_tbl_0[k] = v
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for k, v in pairs(val) do
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_tbl_0[k] = copy(v)
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end
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return _tbl_0
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end)()
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end,
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deep_copy = function(tbl)
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local seen = { }
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local copy
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copy = function(val)
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if type(tbl) ~= 'table' then
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return val
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end
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if seen[tbl] then
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return seen[val]
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end
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seen[val] = tbl
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return (function()
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local _tbl_0 = { }
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for k, v in pairs(val) do
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_tbl_0[k] = copy(v)
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end
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return _tbl_0
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end)()
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end
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return copy(tbl)
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end,
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ass_color = function(r, g, b)
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return string.format("&H%02X%02X%02X&", b, g, r)
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end,
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ass_alpha = function(a)
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return string.format("&H%02X&", a)
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end,
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ass_style_color = function(r, g, b, a)
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return string.format("&H%02X%02X%02X%02X", a, b, g, r)
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end,
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extract_color = function(s)
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local a, b, g, r
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a, b, g, r = s:match('&H(%x%x)(%x%x)(%x%x)(%x%x)')
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if a then
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return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), tonumber(a, 16)
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end
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b, g, r = s:match('&H(%x%x)(%x%x)(%x%x)&')
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if b then
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return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), 0
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end
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a = s:match('&H(%x%x)&')
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if a then
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return 0, 0, 0, tonumber(a, 16)
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end
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r, g, b, a = s:match('#(%x%x)(%x?%x?)(%x?%x?)(%x?%x?)')
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if r then
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return tonumber(r, 16), tonumber(g, 16) or 0, tonumber(b, 16) or 0, tonumber(a, 16) or 0
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end
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end,
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alpha_from_style = function(scolor)
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return ass_alpha(select(4, extract_color(scolor)))
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end,
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color_from_style = function(scolor)
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local r, g, b = extract_color(scolor)
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return ass_color(r or 0, g or 0, b or 0)
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end,
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HSV_to_RGB = function(H, S, V)
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local r, g, b = 0, 0, 0
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if S == 0 then
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r = self:clamp(V * 255, 0, 255)
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g = r
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b = r
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else
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H = math.abs(H) % 360
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local Hi = math.floor(H / 60)
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local f = H / 60.0 - Hi
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local p = V * (1 - S)
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local q = V * (1 - f * S)
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local t = V * (1 - (1 - f) * S)
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if Hi == 0 then
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r = V * 255.0
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g = t * 255.0
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b = p * 255.0
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elseif Hi == 1 then
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r = q * 255.0
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g = V * 255.0
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b = p * 255.0
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elseif Hi == 2 then
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r = p * 255.0
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g = V * 255.0
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b = t * 255.0
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elseif Hi == 3 then
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r = p * 255.0
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g = q * 255.0
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b = V * 255.0
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elseif Hi == 4 then
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r = t * 255.0
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g = p * 255.0
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b = V * 255.0
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elseif Hi == 5 then
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r = V * 255.0
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g = p * 255.0
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b = q * 255.0
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else
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error("math.floor(H % 360 / 60) should be [0, 6), is " .. tostring(Hi) .. "?")
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end
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end
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return r, g, b
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end,
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HSL_to_RGB = function(H, S, L)
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local r, g, b
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H = math.abs(H) % 360
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S = clamp(S, 0, 1)
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L = clamp(L, 0, 1)
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if S == 0 then
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r = L
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g = L
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b = L
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else
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local Q
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if L < 0.5 then
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Q = L * (1.0 + S)
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else
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Q = L + S - (L * S)
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end
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local P = 2.0 * L - Q
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local Hk = H / 360
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local Tr, Tg, Tb
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if Hk < 1 / 3 then
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Tr = Hk + 1 / 3
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Tg = Hk
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Tb = Hk + 2 / 3
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elseif Hk > 2 / 3 then
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Tr = Hk - 2 / 3
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Tg = Hk
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Tb = Hk - 1 / 3
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else
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Tr = Hk + 1 / 3
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Tg = Hk
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Tb = Hk - 1 / 3
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end
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local get_component
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get_component = function(T)
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if T < 1 / 6 then
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return P + ((Q - P) * 6.0 * T)
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elseif 1 / 6 <= T and T < 1 / 2 then
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return Q
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elseif 1 / 2 <= T and T < 2 / 3 then
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return P + ((Q - P) * (2 / 3 - T) * 6.0)
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else
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return P
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end
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end
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r = get_component(Tr)
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g = get_component(Tg)
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b = get_component(Tb)
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end
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return math.floor(r * 255 + 0.5), math.floor(g * 255 + 0.5), math.floor(b * 255 + 0.5)
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end,
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trim = function(s)
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return s:gsub('^%s*(.-)%s*$', '%1')
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end,
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headtail = function(s)
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local a, b, head, tail = s:find('(.-)%s+(.*)')
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if a then
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return head, tail
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else
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return s, ''
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end
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end,
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words = function(s)
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return function()
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if s == '' then
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return
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end
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local head, tail = string.headtail(s)
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s = tail
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return head
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end
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end,
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clamp = function(val, min, max)
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if val < min then
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return min
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elseif val > max then
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return max
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else
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return val
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end
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end,
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interpolate = function(pct, min, max)
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if pct <= 0 then
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return min
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elseif pct >= 1 then
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return max
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else
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return pct * (max - min) + min
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end
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end,
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interpolate_color = function(pct, first, last)
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local r1, g1, b1 = extract_color(first)
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local r2, g2, b2 = extract_color(last)
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local r, g, b = interpolate(pct, r1, r2), interpolate(pct, g1, g2), interpolate(pct, b1, b2)
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return ass_color(r, g, b)
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end,
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interpolate_alpha = function(pct, first, last)
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return ass_alpha(interpolate(pct, select(4, extract_color(first)), select(4, extract_color(last))))
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end
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return copy(tbl)
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end
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local ass_color
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ass_color = function(r, g, b)
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return sformat("&H%02X%02X%02X&", b, g, r)
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end
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local ass_alpha
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ass_alpha = function(a)
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return sformat("&H%02X&", a)
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end
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local ass_style_color
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ass_style_color = function(r, g, b, a)
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return sformat("&H%02X%02X%02X%02X", a, b, g, r)
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end
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local extract_color
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extract_color = function(s)
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local a, b, g, r
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a, b, g, r = s:match('&H(%x%x)(%x%x)(%x%x)(%x%x)')
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if a then
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return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), tonumber(a, 16)
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end
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b, g, r = s:match('&H(%x%x)(%x%x)(%x%x)&')
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if b then
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return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), 0
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end
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a = s:match('&H(%x%x)&')
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if a then
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return 0, 0, 0, tonumber(a, 16)
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end
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r, g, b, a = s:match('#(%x%x)(%x?%x?)(%x?%x?)(%x?%x?)')
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if r then
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return tonumber(r, 16), tonumber(g, 16) or 0, tonumber(b, 16) or 0, tonumber(a, 16) or 0
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end
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end
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local alpha_from_style
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alpha_from_style = function(scolor)
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return ass_alpha(select(4, extract_color(scolor)))
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end
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local color_from_style
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color_from_style = function(scolor)
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local r, g, b = extract_color(scolor)
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return ass_color(r or 0, g or 0, b or 0)
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end
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local HSV_to_RGB
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HSV_to_RGB = function(H, S, V)
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local r, g, b = 0, 0, 0
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if S == 0 then
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r = self:clamp(V * 255, 0, 255)
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g = r
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b = r
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else
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H = math.abs(H) % 360
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local Hi = math.floor(H / 60)
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local f = H / 60.0 - Hi
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local p = V * (1 - S)
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local q = V * (1 - f * S)
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local t = V * (1 - (1 - f) * S)
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if Hi == 0 then
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r = V * 255.0
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g = t * 255.0
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b = p * 255.0
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elseif Hi == 1 then
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r = q * 255.0
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g = V * 255.0
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b = p * 255.0
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elseif Hi == 2 then
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r = p * 255.0
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g = V * 255.0
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b = t * 255.0
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elseif Hi == 3 then
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r = p * 255.0
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g = q * 255.0
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b = V * 255.0
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elseif Hi == 4 then
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r = t * 255.0
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g = p * 255.0
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b = V * 255.0
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elseif Hi == 5 then
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r = V * 255.0
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g = p * 255.0
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b = q * 255.0
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else
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error("math.floor(H % 360 / 60) should be [0, 6), is " .. tostring(Hi) .. "?")
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end
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end
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return r, g, b
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end
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local HSL_to_RGB
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HSL_to_RGB = function(H, S, L)
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local r, g, b
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H = math.abs(H) % 360
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S = clamp(S, 0, 1)
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L = clamp(L, 0, 1)
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if S == 0 then
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r = L
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g = L
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b = L
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else
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local Q
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if L < 0.5 then
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Q = L * (1.0 + S)
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else
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Q = L + S - (L * S)
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end
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local P = 2.0 * L - Q
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local Hk = H / 360
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local Tr, Tg, Tb
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if Hk < 1 / 3 then
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Tr = Hk + 1 / 3
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Tg = Hk
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Tb = Hk + 2 / 3
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elseif Hk > 2 / 3 then
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Tr = Hk - 2 / 3
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Tg = Hk
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Tb = Hk - 1 / 3
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else
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Tr = Hk + 1 / 3
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Tg = Hk
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Tb = Hk - 1 / 3
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end
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local get_component
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get_component = function(T)
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if T < 1 / 6 then
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return P + ((Q - P) * 6.0 * T)
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elseif 1 / 6 <= T and T < 1 / 2 then
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return Q
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elseif 1 / 2 <= T and T < 2 / 3 then
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return P + ((Q - P) * (2 / 3 - T) * 6.0)
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else
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return P
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end
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end
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r = get_component(Tr)
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g = get_component(Tg)
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b = get_component(Tb)
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end
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return math.floor(r * 255 + 0.5), math.floor(g * 255 + 0.5), math.floor(b * 255 + 0.5)
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end
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local trim
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trim = function(s)
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return s:gsub('^%s*(.-)%s*$', '%1')
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end
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local headtail
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headtail = function(s)
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local a, b, head, tail = s:find('(.-)%s+(.*)')
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if a then
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return head, tail
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else
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return s, ''
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end
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end
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local words
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words = function(s)
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return function()
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if s == '' then
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return
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end
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local head, tail = headtail(s)
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s = tail
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return head
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end
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end
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local clamp
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clamp = function(val, min, max)
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if val < min then
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return min
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elseif val > max then
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return max
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else
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return val
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end
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end
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local interpolate
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interpolate = function(pct, min, max)
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if pct <= 0 then
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return min
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elseif pct >= 1 then
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return max
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else
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return pct * (max - min) + min
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end
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end
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local interpolate_color
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interpolate_color = function(pct, first, last)
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local r1, g1, b1 = extract_color(first)
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local r2, g2, b2 = extract_color(last)
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local r, g, b = interpolate(pct, r1, r2), interpolate(pct, g1, g2), interpolate(pct, b1, b2)
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return ass_color(r, g, b)
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end
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local interpolate_alpha
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interpolate_alpha = function(pct, first, last)
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return ass_alpha(interpolate(pct, select(4, extract_color(first)), select(4, extract_color(last))))
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end
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return {
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copy = copy,
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deep_copy = deep_copy,
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ass_color = ass_color,
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ass_alpha = ass_alpha,
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ass_style_color = ass_style_color,
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extract_color = extract_color,
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alpha_from_style = alpha_from_style,
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color_from_style = color_from_style,
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HSV_to_RGB = HSV_to_RGB,
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HSL_to_RGB = HSL_to_RGB,
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trim = trim,
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headtail = headtail,
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words = words,
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clamp = clamp,
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interpolate = interpolate,
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interpolate_color = interpolate_color,
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interpolate_alpha = interpolate_alpha
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}
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return utils
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@ -13,199 +13,203 @@
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-- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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-- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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utils =
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-- Make a shallow copy of a table
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copy: (tbl) -> {k, v for k, v in pairs tbl}
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sformat = string.format
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-- Make a deep copy of a table
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-- Retains equality of table references inside the copy and handles self-referencing structures
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deep_copy: (tbl) ->
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seen = {}
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copy = (val) ->
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return val if type(tbl) != 'table'
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return seen[val] if seen[tbl]
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seen[val] = tbl
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{k, copy(v) for k, v in pairs val}
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copy tbl
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-- Make a shallow copy of a table
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copy = (tbl) -> {k, v for k, v in pairs tbl}
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-- Generates ASS hexadecimal string from R, G, B integer components, in &HBBGGRR& format
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ass_color: (r, g, b) -> string.format "&H%02X%02X%02X&", b, g, r
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-- Format an alpha-string for \Xa style overrides
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ass_alpha: (a) -> string.format "&H%02X&", a
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-- Format an ABGR string for use in style definitions (these don't end with & either)
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ass_style_color: (r, g, b, a) -> string.format "&H%02X%02X%02X%02X", a, b, g, r
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-- Make a deep copy of a table
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-- Retains equality of table references inside the copy and handles self-referencing structures
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deep_copy = (tbl) ->
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seen = {}
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copy = (val) ->
|
||||
return val if type(tbl) != 'table'
|
||||
return seen[val] if seen[tbl]
|
||||
seen[val] = tbl
|
||||
{k, copy(v) for k, v in pairs val}
|
||||
copy tbl
|
||||
|
||||
-- Extract colour components of an ASS colour
|
||||
extract_color: (s) ->
|
||||
local a, b, g, r
|
||||
-- Generates ASS hexadecimal string from R, G, B integer components, in &HBBGGRR& format
|
||||
ass_color = (r, g, b) -> sformat "&H%02X%02X%02X&", b, g, r
|
||||
-- Format an alpha-string for \Xa style overrides
|
||||
ass_alpha = (a) -> sformat "&H%02X&", a
|
||||
-- Format an ABGR string for use in style definitions (these don't end with & either)
|
||||
ass_style_color = (r, g, b, a) -> sformat "&H%02X%02X%02X%02X", a, b, g, r
|
||||
|
||||
-- Try a style first
|
||||
a, b, g, r = s\match '&H(%x%x)(%x%x)(%x%x)(%x%x)'
|
||||
if a then
|
||||
return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), tonumber(a, 16)
|
||||
-- Extract colour components of an ASS colour
|
||||
extract_color = (s) ->
|
||||
local a, b, g, r
|
||||
|
||||
-- Then a colour override
|
||||
b, g, r = s\match '&H(%x%x)(%x%x)(%x%x)&'
|
||||
if b then
|
||||
return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), 0
|
||||
-- Try a style first
|
||||
a, b, g, r = s\match '&H(%x%x)(%x%x)(%x%x)(%x%x)'
|
||||
if a then
|
||||
return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), tonumber(a, 16)
|
||||
|
||||
-- Then an alpha override
|
||||
a = s\match '&H(%x%x)&'
|
||||
if a then
|
||||
return 0, 0, 0, tonumber(a, 16)
|
||||
-- Then a colour override
|
||||
b, g, r = s\match '&H(%x%x)(%x%x)(%x%x)&'
|
||||
if b then
|
||||
return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), 0
|
||||
|
||||
-- Ok how about HTML format then?
|
||||
r, g, b, a = s\match '#(%x%x)(%x?%x?)(%x?%x?)(%x?%x?)'
|
||||
if r then
|
||||
return tonumber(r, 16), tonumber(g, 16) or 0, tonumber(b, 16) or 0, tonumber(a, 16) or 0
|
||||
-- Then an alpha override
|
||||
a = s\match '&H(%x%x)&'
|
||||
if a then
|
||||
return 0, 0, 0, tonumber(a, 16)
|
||||
|
||||
-- Create an alpha override code from a style definition colour code
|
||||
alpha_from_style: (scolor) -> ass_alpha select 4, extract_color scolor
|
||||
-- Ok how about HTML format then?
|
||||
r, g, b, a = s\match '#(%x%x)(%x?%x?)(%x?%x?)(%x?%x?)'
|
||||
if r then
|
||||
return tonumber(r, 16), tonumber(g, 16) or 0, tonumber(b, 16) or 0, tonumber(a, 16) or 0
|
||||
|
||||
-- Create an colour override code from a style definition colour code
|
||||
color_from_style: (scolor) ->
|
||||
r, g, b = extract_color scolor
|
||||
ass_color r or 0, g or 0, b or 0
|
||||
-- Create an alpha override code from a style definition colour code
|
||||
alpha_from_style = (scolor) -> ass_alpha select 4, extract_color scolor
|
||||
|
||||
-- Converts HSV (Hue, Saturation, Value) to RGB
|
||||
HSV_to_RGB: (H, S, V) ->
|
||||
r, g, b = 0, 0, 0
|
||||
-- Create an colour override code from a style definition colour code
|
||||
color_from_style = (scolor) ->
|
||||
r, g, b = extract_color scolor
|
||||
ass_color r or 0, g or 0, b or 0
|
||||
|
||||
-- Saturation is zero, make grey
|
||||
if S == 0
|
||||
r = @clamp(V*255, 0, 255)
|
||||
g = r
|
||||
b = r
|
||||
-- Converts HSV (Hue, Saturation, Value) to RGB
|
||||
HSV_to_RGB = (H, S, V) ->
|
||||
r, g, b = 0, 0, 0
|
||||
|
||||
-- Else, calculate color
|
||||
-- Saturation is zero, make grey
|
||||
if S == 0
|
||||
r = @clamp(V*255, 0, 255)
|
||||
g = r
|
||||
b = r
|
||||
|
||||
-- Else, calculate color
|
||||
else
|
||||
-- Calculate subvalues
|
||||
H = math.abs(H) % 360 -- Put H in range [0, 360)
|
||||
Hi = math.floor(H/60)
|
||||
f = H/60.0 - Hi
|
||||
p = V*(1-S)
|
||||
q = V*(1-f*S)
|
||||
t = V*(1-(1-f)*S)
|
||||
|
||||
-- Do math based on hue index
|
||||
if Hi == 0
|
||||
r = V*255.0
|
||||
g = t*255.0
|
||||
b = p*255.0
|
||||
elseif Hi == 1
|
||||
r = q*255.0
|
||||
g = V*255.0
|
||||
b = p*255.0
|
||||
elseif Hi == 2
|
||||
r = p*255.0
|
||||
g = V*255.0
|
||||
b = t*255.0
|
||||
elseif Hi == 3
|
||||
r = p*255.0
|
||||
g = q*255.0
|
||||
b = V*255.0
|
||||
elseif Hi == 4
|
||||
r = t*255.0
|
||||
g = p*255.0
|
||||
b = V*255.0
|
||||
elseif Hi == 5
|
||||
r = V*255.0
|
||||
g = p*255.0
|
||||
b = q*255.0
|
||||
else
|
||||
-- Calculate subvalues
|
||||
H = math.abs(H) % 360 -- Put H in range [0, 360)
|
||||
Hi = math.floor(H/60)
|
||||
f = H/60.0 - Hi
|
||||
p = V*(1-S)
|
||||
q = V*(1-f*S)
|
||||
t = V*(1-(1-f)*S)
|
||||
error "math.floor(H % 360 / 60) should be [0, 6), is #{Hi}?"
|
||||
|
||||
-- Do math based on hue index
|
||||
if Hi == 0
|
||||
r = V*255.0
|
||||
g = t*255.0
|
||||
b = p*255.0
|
||||
elseif Hi == 1
|
||||
r = q*255.0
|
||||
g = V*255.0
|
||||
b = p*255.0
|
||||
elseif Hi == 2
|
||||
r = p*255.0
|
||||
g = V*255.0
|
||||
b = t*255.0
|
||||
elseif Hi == 3
|
||||
r = p*255.0
|
||||
g = q*255.0
|
||||
b = V*255.0
|
||||
elseif Hi == 4
|
||||
r = t*255.0
|
||||
g = p*255.0
|
||||
b = V*255.0
|
||||
elseif Hi == 5
|
||||
r = V*255.0
|
||||
g = p*255.0
|
||||
b = q*255.0
|
||||
else
|
||||
error "math.floor(H % 360 / 60) should be [0, 6), is #{Hi}?"
|
||||
return r, g, b
|
||||
|
||||
return r, g, b
|
||||
-- Convert HSL (Hue, Saturation, Luminance) to RGB
|
||||
-- Contributed by Gundamn
|
||||
HSL_to_RGB = (H, S, L) ->
|
||||
local r, g, b
|
||||
|
||||
-- Convert HSL (Hue, Saturation, Luminance) to RGB
|
||||
-- Contributed by Gundamn
|
||||
HSL_to_RGB: (H, S, L) ->
|
||||
local r, g, b
|
||||
-- Make sure input is in range
|
||||
H = math.abs(H) % 360
|
||||
S = clamp(S, 0, 1)
|
||||
L = clamp(L, 0, 1)
|
||||
|
||||
-- Make sure input is in range
|
||||
H = math.abs(H) % 360
|
||||
S = clamp(S, 0, 1)
|
||||
L = clamp(L, 0, 1)
|
||||
|
||||
if S == 0 -- Simple case if saturation is 0, all grey
|
||||
r = L
|
||||
g = L
|
||||
b = L
|
||||
if S == 0 -- Simple case if saturation is 0, all grey
|
||||
r = L
|
||||
g = L
|
||||
b = L
|
||||
else
|
||||
-- More common case, saturated colour
|
||||
Q = if L < 0.5
|
||||
L * (1.0 + S)
|
||||
else
|
||||
-- More common case, saturated colour
|
||||
Q = if L < 0.5
|
||||
L * (1.0 + S)
|
||||
L + S - (L * S)
|
||||
|
||||
P = 2.0 * L - Q
|
||||
|
||||
Hk = H / 360
|
||||
|
||||
local Tr, Tg, Tb
|
||||
if Hk < 1/3
|
||||
Tr = Hk + 1/3
|
||||
Tg = Hk
|
||||
Tb = Hk + 2/3
|
||||
elseif Hk > 2/3
|
||||
Tr = Hk - 2/3
|
||||
Tg = Hk
|
||||
Tb = Hk - 1/3
|
||||
else
|
||||
Tr = Hk + 1/3
|
||||
Tg = Hk
|
||||
Tb = Hk - 1/3
|
||||
|
||||
get_component = (T) ->
|
||||
if T < 1/6
|
||||
P + ((Q - P) * 6.0 * T)
|
||||
elseif 1/6 <= T and T < 1/2
|
||||
Q
|
||||
elseif 1/2 <= T and T < 2/3
|
||||
P + ((Q - P) * (2/3 - T) * 6.0)
|
||||
else
|
||||
L + S - (L * S)
|
||||
P
|
||||
|
||||
P = 2.0 * L - Q
|
||||
r = get_component(Tr)
|
||||
g = get_component(Tg)
|
||||
b = get_component(Tb)
|
||||
|
||||
Hk = H / 360
|
||||
return math.floor(r*255+0.5), math.floor(g*255+0.5), math.floor(b*255+0.5)
|
||||
|
||||
local Tr, Tg, Tb
|
||||
if Hk < 1/3
|
||||
Tr = Hk + 1/3
|
||||
Tg = Hk
|
||||
Tb = Hk + 2/3
|
||||
elseif Hk > 2/3
|
||||
Tr = Hk - 2/3
|
||||
Tg = Hk
|
||||
Tb = Hk - 1/3
|
||||
else
|
||||
Tr = Hk + 1/3
|
||||
Tg = Hk
|
||||
Tb = Hk - 1/3
|
||||
-- Removes spaces at the start and end of string
|
||||
trim = (s) -> s\gsub '^%s*(.-)%s*$', '%1'
|
||||
|
||||
get_component = (T) ->
|
||||
if T < 1/6
|
||||
P + ((Q - P) * 6.0 * T)
|
||||
elseif 1/6 <= T and T < 1/2
|
||||
Q
|
||||
elseif 1/2 <= T and T < 2/3
|
||||
P + ((Q - P) * (2/3 - T) * 6.0)
|
||||
else
|
||||
P
|
||||
-- Get the 'head' and 'tail' of a string, treating it as a sequence of words separated by one or more space-characters
|
||||
headtail = (s) ->
|
||||
a, b, head, tail = s\find '(.-)%s+(.*)'
|
||||
if a then head, tail else s, ''
|
||||
|
||||
r = get_component(Tr)
|
||||
g = get_component(Tg)
|
||||
b = get_component(Tb)
|
||||
-- Iterator function for headtail
|
||||
words = (s) -> ->
|
||||
return if s == ''
|
||||
head, tail = headtail s
|
||||
s = tail
|
||||
head
|
||||
|
||||
return math.floor(r*255+0.5), math.floor(g*255+0.5), math.floor(b*255+0.5)
|
||||
-- Clamp a number value to a range
|
||||
clamp = (val, min, max) ->
|
||||
if val < min then min elseif val > max then max else val
|
||||
|
||||
-- Removes spaces at the start and end of string
|
||||
trim: (s) -> s\gsub '^%s*(.-)%s*$', '%1'
|
||||
-- Interpolate between two numbers
|
||||
interpolate = (pct, min, max) ->
|
||||
if pct <= 0 then min elseif pct >= 1 then max else pct * (max - min) + min
|
||||
|
||||
-- Get the 'head' and 'tail' of a string, treating it as a sequence of words separated by one or more space-characters
|
||||
headtail: (s) ->
|
||||
a, b, head, tail = s\find '(.-)%s+(.*)'
|
||||
if a then head, tail else s, ''
|
||||
-- Interpolate between two colour values, given in either style definition or style override format
|
||||
-- Return in style override format
|
||||
interpolate_color = (pct, first, last) ->
|
||||
r1, g1, b1 = extract_color first
|
||||
r2, g2, b2 = extract_color last
|
||||
r, g, b = interpolate(pct, r1, r2), interpolate(pct, g1, g2), interpolate(pct, b1, b2)
|
||||
ass_color r, g, b
|
||||
|
||||
-- Iterator function for headtail
|
||||
words: (s) -> ->
|
||||
return if s == ''
|
||||
head, tail = string.headtail s
|
||||
s = tail
|
||||
head
|
||||
-- Interpolate between two alpha values, given either in style override or as part as a style definition colour
|
||||
-- Return in style override format
|
||||
interpolate_alpha = (pct, first, last) ->
|
||||
ass_alpha interpolate pct, select(4, extract_color first), select(4, extract_color last)
|
||||
|
||||
-- Clamp a number value to a range
|
||||
clamp: (val, min, max) ->
|
||||
if val < min then min elseif val > max then max else val
|
||||
|
||||
-- Interpolate between two numbers
|
||||
interpolate: (pct, min, max) ->
|
||||
if pct <= 0 then min elseif pct >= 1 then max else pct * (max - min) + min
|
||||
|
||||
-- Interpolate between two colour values, given in either style definition or style override format
|
||||
-- Return in style override format
|
||||
interpolate_color: (pct, first, last) ->
|
||||
r1, g1, b1 = extract_color first
|
||||
r2, g2, b2 = extract_color last
|
||||
r, g, b = interpolate(pct, r1, r2), interpolate(pct, g1, g2), interpolate(pct, b1, b2)
|
||||
ass_color r, g, b
|
||||
|
||||
-- Interpolate between two alpha values, given either in style override or as part as a style definition colour
|
||||
-- Return in style override format
|
||||
interpolate_alpha: (pct, first, last) ->
|
||||
ass_alpha interpolate pct, select(4, extract_color first), select(4, extract_color last)
|
||||
|
||||
utils
|
||||
{ :copy, :deep_copy, :ass_color, :ass_alpha, :ass_style_color,
|
||||
:extract_color, :alpha_from_style, :color_from_style, :HSV_to_RGB,
|
||||
:HSL_to_RGB, :trim, :headtail, :words, :clamp, :interpolate,
|
||||
:interpolate_color, :interpolate_alpha }
|
||||
|
|
|
|||
Loading…
Reference in a new issue