diff options
Diffstat (limited to 'tex/context/base/mkxl/math-spa.lmt')
| -rw-r--r-- | tex/context/base/mkxl/math-spa.lmt | 56 |
1 files changed, 38 insertions, 18 deletions
diff --git a/tex/context/base/mkxl/math-spa.lmt b/tex/context/base/mkxl/math-spa.lmt index 487d9e4a4..698692a2c 100644 --- a/tex/context/base/mkxl/math-spa.lmt +++ b/tex/context/base/mkxl/math-spa.lmt @@ -15,6 +15,7 @@ local hlist_code = nodes.nodecodes.hlist local glue_code = nodes.nodecodes.glue local line_code = nodes.listcodes.line local ghost_code = nodes.listcodes.ghost +local middle_code = nodes.listcodes.middle local nuts = nodes.nuts local tonut = nodes.tonut @@ -26,12 +27,14 @@ local getnext = nuts.getnext local getwidth = nuts.getwidth local getdata = nuts.getdata local getdepth = nuts.getdepth +local getheight = nuts.getheight local getlist = nuts.getlist local setglue = nuts.setglue local getdimensions = nuts.dimensions local getnormalizedline = node.direct.getnormalizedline local getbox = nuts.getbox local setoffsets = nuts.setoffsets +local addxoffset = nuts.addxoffset local nextglue = nuts.traversers.glue local nextlist = nuts.traversers.list @@ -73,43 +76,60 @@ stages[1] = function(specification,stage) end end +local function reposition(n,offset) + -- We need to relocate the local boxes that we use to push something left or + -- right ... quite horrible and one needs a bit twisted mindset for this. + for n, id, subtype, list in nextlist, getlist(n) do + if subtype == middle_code then + addxoffset(n,-offset) + end + end + addxoffset(n,offset) +end + stages[2] = function(specification,stage) - local head = getlist(getbox(specification.box)) - local align = specification.alignstate - local max = false - local cnt = 0 - local width = 0 - local depth = 0 + local head = getlist(getbox(specification.box)) + local align = specification.alignstate + local maxwidth = false + local cnt = 0 + local lastwidth = 0 + local firstheight = 0 + local lastdepth = 0 for n, id, subtype, list in nextlist, head do if subtype == line_code then local t = getnormalizedline(n) local m = t.rightskip + t.parfillrightskip - if not max then - max = m - elseif m < max then - max = m + if not maxwidth then + maxwidth = m + firstheight = getheight(n) + firstwidth = m + elseif m < maxwidth then + maxwidth = m end - cnt = cnt + 1 - width = m - depth = getdepth(n) + cnt = cnt + 1 + lastwidth = m + lastdepth = getdepth(n) end end if stage == 2 and (align == 2 or align == 3) then for n, id, subtype, list in nextlist, head do if subtype == line_code then if align == 1 then -- flushleft + -- todo elseif align == 2 then -- middle - setoffsets(n,max/2,0) + reposition(n,maxwidth/2) elseif align == 3 then -- flushright - setoffsets(n,max,0) + reposition(n,maxwidth) end end end end texsetcount("global","c_strc_math_n_of_lines",cnt) - texsetdimen("global","d_strc_math_max_width",max) - texsetdimen("global","d_strc_math_last_width",width) - texsetdimen("global","d_strc_math_last_depth",depth) + texsetdimen("global","d_strc_math_max_width",maxwidth) + texsetdimen("global","d_strc_math_first_width",firstwidth) + texsetdimen("global","d_strc_math_last_width",lastwidth) + texsetdimen("global","d_strc_math_first_height",firstheight) + texsetdimen("global","d_strc_math_last_depth",lastdepth) end stages[3] = stages[2] |