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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",
}
local mppath = mp.path
local scannumeric = mp.scan.numeric
local scanpath = mp.scan.path
local getparameter = metapost.getparameter
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
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