diff options
Diffstat (limited to 'Master/texmf-dist/tex/context/base/mkiv/back-trf.lua')
-rw-r--r-- | Master/texmf-dist/tex/context/base/mkiv/back-trf.lua | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/mkiv/back-trf.lua b/Master/texmf-dist/tex/context/base/mkiv/back-trf.lua new file mode 100644 index 00000000000..1586bc440f4 --- /dev/null +++ b/Master/texmf-dist/tex/context/base/mkiv/back-trf.lua @@ -0,0 +1,164 @@ +if not modules then modules = { } end modules ['back-trf'] = { + version = 1.001, + comment = "companion to back-ini.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local sind, cosd, abs = math.sind, math.cosd, math.abs +local insert, remove = table.insert, table.remove +local unpack = unpack + +local context = context + +local formatters = string.formatters + +local scanners = tokens.scanners +local scankeyword = scanners.keyword +local scaninteger = scanners.integer +local scannumber = scanners.number +local scanstring = scanners.string + +local implement = interfaces.implement + +local nodepool = nodes.pool +local savenode = nodepool.save +local restorenode = nodepool.restore +local setmatrixnode = nodepool.setmatrix +local literalnode = nodepool.literal -- has to become some nodeinjection + +local stack = { } +local restore = true -- false + +updaters.register("backend.update",function() + savenode = nodepool.save + restorenode = nodepool.restore + setmatrixnode = nodepool.setmatrix + literalnode = nodepool.literal -- has to become some nodeinjection +end) + +local function stopsomething() + local top = remove(stack) + if top == false then + -- not wrapped + elseif top == true then + context(restorenode()) + elseif top then + context(setmatrixnode(unpack(top))) -- not really needed anymore + context(restorenode()) + else + -- nesting error + end +end + +local function startrotation() + local a = scannumber() + if a == 0 then + insert(stack,false) + else + local s, c = sind(a), cosd(a) + if abs(s) < 0.000001 then + s = 0 -- otherwise funny -0.00000 + end + if abs(c) < 0.000001 then + c = 0 -- otherwise funny -0.00000 + end + context(savenode()) + context(setmatrixnode(c,s,-s,c)) + insert(stack,restore and { c, -s, s, c } or true) + end +end + +implement { name = "startrotation", actions = startrotation } +implement { name = "stoprotation", actions = stopsomething } + +local function startscaling() -- at the tex end we use sx and sy instead of rx and ry + local rx, ry = 1, 1 + while true do + if scankeyword("rx") then + rx = scannumber() + elseif scankeyword("ry") then + ry = scannumber() + -- elseif scankeyword("revert") then + -- local top = stack[#stack] + -- if top then + -- rx = top[1] + -- ry = top[4] + -- else + -- rx = 1 + -- ry = 1 + -- end + else + break + end + end + if rx == 1 and ry == 1 then + insert(stack,false) + else + if rx == 0 then + rx = 0.0001 + end + if ry == 0 then + ry = 0.0001 + end + context(savenode()) + context(setmatrixnode(rx,0,0,ry)) + insert(stack,restore and { 1/rx, 0, 0, 1/ry } or true) + end +end + +implement { name = "startscaling", actions = startscaling } +implement { name = "stopscaling", actions = stopsomething } + +local function startmatrix() -- rx sx sy ry -- tx, ty + local rx, sx, sy, ry = 1, 0, 0, 1 + while true do + if scankeyword("rx") then rx = scannumber() + elseif scankeyword("ry") then ry = scannumber() + elseif scankeyword("sx") then sx = scannumber() + elseif scankeyword("sy") then sy = scannumber() + else break end + end + if rx == 1 and sx == 0 and sy == 0 and ry == 1 then + insert(stack,false) + else + context(savenode()) + context(setmatrixnode(rx,sx,sy,ry)) + insert(stack,store and { -rx, -sx, -sy, -ry } or true) + end +end + +implement { name = "startmatrix", actions = startmatrix } +implement { name = "stopmatrix", actions = stopsomething } + +local function startmirroring() + context(setmatrixnode(-1,0,0,1)) +end + +implement { name = "startmirroring", actions = startmirroring } +implement { name = "stopmirroring", actions = startmirroring } -- not: stopsomething + +-- this could also run on top of pack-rul ... todo + +-- local function startclipping() +-- -- context(savenode()) +-- context(literalnode("origin",formatters["q 0 w %s W n"](scanstring()))) +-- end +-- +-- local function stopclipping() +-- -- context(restorenode()) +-- context(literalnode("Q")) +-- end + +local function startclipping() + context(savenode()) + context(literalnode("origin",formatters["0 w %s W n"](scanstring()))) +end + +local function stopclipping() + context(restorenode()) +end + +implement { name = "startclipping", actions = startclipping } +implement { name = "stopclipping", actions = stopclipping } |