2019-08-09 18:36:00

1 files changed, 48 insertions, 0 deletions

diff --git a/tex/context/base/mkiv/mlib-lmt.lua b/tex/context/base/mkiv/mlib-lmt.lua
new file mode 100644
index 000000000..774ddc8e5
--- /dev/null
+++ b/tex/context/base/mkiv/mlib-lmt.lua
@@ -0,0 +1,48 @@
+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
+
+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