diff options
Diffstat (limited to 'tex/context/base/colo-ini.lua')
| -rw-r--r-- | tex/context/base/colo-ini.lua | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/tex/context/base/colo-ini.lua b/tex/context/base/colo-ini.lua index fc63d6b3a..8797b85f5 100644 --- a/tex/context/base/colo-ini.lua +++ b/tex/context/base/colo-ini.lua @@ -407,3 +407,39 @@ function colors.spotcolorvalue(ca,default) end return tostring(v) end + +-- experiment (a bit of a hack, as we need to get the attribute number) + +local min = math.min + +local function f(one,two,i,fraction) + return min(fraction*(one[i]+two[i]),1) +end + +function colors.defineintermediate(name,fraction,c_one,c_two,a_one,a_two,global,freeze) + local one, two = colors.value(c_one), colors.value(c_two) + if one and two then + local csone, cstwo = one[1], two[1] + if csone == cstwo then + local ca + if csone == 2 then + ca = colors.register(name,'gray',f(one,two,2,fraction)) + elseif csone == 3 then + ca = colors.register(name,'rgb',f(one,two,3,fraction),f(one,two,4,fraction),f(one,two,5,fraction)) + elseif csone == 4 then + ca = colors.register(name,'rgb',f(one,two,6,fraction),f(one,two,7,fraction),f(one,two,8,fraction),f(one,two,9,fraction)) + else + ca = colors.register(name,'gray',f(one,two,2,fraction)) + end + definecolor(name,ca,global,freeze) + end + end + local one, two = transparencies.value(a_one), transparencies.value(a_two) + if one and two then + local tsone, tstwo = one[1], two[1] + if tsone == tstwo then + local ta = transparencies.register(name,tsone,f(one,two,2,fraction)) + definetransparent(name,ta,global) + end + end +end |