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if not modules then modules = { } end modules ['mlib-lmt'] = {
version = 1.001,
comment = "companion to mlib-ctx.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- todo: check for possible inject usage
local type = type
local round = math.round
local aux = mp.aux
local mpdirect = aux.direct
local mppath = mp.path
local scan = mp.scan
local scannumeric = scan.numeric
local scanpath = scan.path
local injectpath = mp.inject.path
local injectcolor = mp.inject.color
local getparameter = metapost.getparameter
local registerscript = metapost.registerscript
function mp.lmt_function_x(xmin,xmax,xstep,code,shape) -- experimental
local code = "return function(x) return " .. code .. " end"
local action = load(code)
local points = { }
local nofpoints = 0
if action then
action = action()
end
if shape == "steps" then
local halfx = xstep / 2
local lastx = xmin
local lasty = action(xmin)
for xi = xmin, xmax, xstep do
local yi = action(xi)
local xx = lastx + halfx
nofpoints = nofpoints + 1 ; points[nofpoints] = { xx, lasty }
nofpoints = nofpoints + 1 ; points[nofpoints] = { xx, yi }
lastx = xi
lasty = yi
end
if points[nofpoints][1] ~= xmax then
local yi = action(xmax)
local xx = lastx + halfx
nofpoints = nofpoints + 1 ; points[nofpoints] = { xx, lasty }
nofpoints = nofpoints + 1 ; points[nofpoints] = { xx, yi }
lastx = xi
lasty = yi
end
else
for xi = xmin, xmax, xstep do
nofpoints = nofpoints + 1 ; points[nofpoints] = { xi, action(xi) }
end
if points[nofpoints][1] ~= xmax then
nofpoints = nofpoints + 1 ; points[nofpoints] = { xmax, action(xmax) }
end
end
mppath(points,shape == "curve" and ".." or "--",false)
end
function mp.lmt_mesh_set()
local mesh = getparameter { "mesh", "paths" }
structures.references.currentset.mesh = mesh
end
function mp.lmt_mesh_update()
local mesh = getparameter { "paths" } or getparameter { "mesh", "paths" }
mesh[scannumeric()] = scanpath(true)
end
-- moved here
function mp.lmt_svg_include()
local labelfile = metapost.getparameter { "labelfile" }
if labelfile and labelfile ~= "" then
local labels = table.load(labelfile) -- todo: same path as svg file
if type(labels) == "table" then
for i=1,#labels do
metapost.remaptext(labels[i])
end
end
end
local fontname = metapost.getparameter { "fontname" }
if fontname and fontname ~= "" then
local unicode = metapost.getparameter { "unicode" }
if unicode then
mpdirect (
metapost.svgglyphtomp(fontname,math.round(unicode))
)
end
return
end
local colorfile = metapost.getparameter { "colormap" }
local colormap = false
if colorfile and colorfile ~= "" then
colormap = metapost.svgcolorremapper(colorfile)
end
local filename = metapost.getparameter { "filename" }
if filename and filename ~= "" then
mpdirect ( metapost.svgtomp {
data = io.loaddata(filename),
remap = true,
colormap = colormap,
id = filename,
} )
else
local buffer = metapost.getparameter { "buffer" }
if buffer then
mpdirect ( metapost.svgtomp {
data = buffers.getcontent(buffer),
-- remap = true,
colormap = colormap,
id = buffer or "buffer",
} )
else
local code = metapost.getparameter { "code" }
if code then
mpdirect ( metapost.svgtomp {
data = code,
colormap = colormap,
id = "code",
} )
end
end
end
end
registerscript("remaptext", function()
local parameters = metapost.scanparameters()
if parameters and parameters.label then
metapost.remaptext(parameters)
end
end)
do
local dropins = fonts.dropins
local registerglyph = dropins.registerglyph
local registerglyphs = dropins.registerglyphs
registerscript("registerglyph", function() registerglyph (metapost.getparameterset("mpsglyph")) end)
registerscript("registerglyphs",function() registerglyphs(metapost.getparameterset("mpsglyphs")) end)
end
todecimal = xdecimal and xdecimal.new or tonumber -- bonus
-- mail on list by Mikael Sundqvist and Taco's analysis of near duplicate points (2021/02/11+)
registerscript("scrutenized", function()
local p = scanpath()
local d = 10^scannumeric()
for i=1,#p do
local pi = p[i]
pi[1] = round(pi[1] * d) / d
pi[2] = round(pi[2] * d) / d
end
local x1 = round(p[1][1])
local y1 = round(p[1][2])
local n = 1
local m = #p
local t = { p[1], cycle = p.cycle }
for i=2,m-1 do
local pi = p[i]
local x2 = round(pi[1])
local y2 = round(pi[2])
if x1 ~= x2 or y1 ~= y2 then
n = n + 1
t[n] = p[i]
x1 = x2
y1 = y2
end
end
local x1 = round(p[1][1])
local y1 = round(p[1][2])
local x2 = round(p[m][1])
local y2 = round(p[m][2])
if x1 ~= x2 or y1 ~= y2 then
n = n + 1
t[n] = p[m]
end
-- mp.path(t)
injectpath(t)
end)
-- A goodie, mostly a side effect of updating the metafun manual.
local labtorgb = attributes.colors.labtorgb
registerscript("labtorgb", function()
injectcolor(labtorgb(scannumeric(),scannumeric(),scannumeric()))
end)
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