On 9/11/2021 4:27 PM, kauśika cittūr via ntg-context wrote:
Dear All,
I am truly grateful for the new additions to MetaFun. It has greatly helped me
in producing neat drawings for my academic work. In this connection, I have a
few queries.
Currently I am using PGFPlots (with ConTeXt) to draw simple plots from CSV
data. I was wondering if there is any way to do the same in MetaFuns. That is,
is it possible to do something like the following in order to obtain a line
plot of the values in the 'data.csv' file? Also is it possible to have the
'labels' be the identical for all points in a given list?
\startMPcode
draw lmt_axis [
sx = 2mm, sy = 2mm,
nx = 80, ny = 40,
tx = 15, ty = 15,
list = {
[
connect = true,
color = "darkblue",
close = true,
points = {data.csv},
labels = {"•"},
]
},
] withpen pencircle scaled 0.5mm;
\stopMPcode
It depends on how one has data in the csv, You can patch mlib-scn.lmt
(line 659)
if type(v) == "table" then
return injectpath(v,connector,close)
elseif type(v) == "string" then
local code = load("return " .. v)
if code then
return code()
end
else
return injectpair(0,0)
end
then a string represents a function:
\starttext
\startluacode
io.savedata("temp.csv", "x,y\n10,10\n20,40\n30,30\n")
local mycsvsplitter = utilities.parsers.rfc4180splitter()
function MP.MyPoints(name)
local data = io.loaddata(name)
local list = mycsvsplitter(data)
table.remove(list,1)
for i=1,#list do
list[i][1] = tonumber(list[i][1])
list[i][2] = tonumber(list[i][2])
end
mp.inject.path(list)
end
\stopluacode
\startMPcode
draw lmt_axis [
sx = 2mm, sy = 2mm,
nx = 80, ny = 40,
tx = 15, ty = 15,
list = {
[
connect = true,
color = "darkblue",
close = true,
points = "MP.MyPoints('temp.csv')",
labels = {"•"},
]
},
] withpen pencircle scaled 0.5mm;
\stopMPcode
\stoptext
we can of course have some predefined and when we can agree on how these
files loo, adding a "csv" is no big deal ... it's all about consistent
interfacing
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Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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