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--
-- This is file `placeat.lua',
-- generated with the docstrip utility.
--
-- The original source files were:
--
-- placeat.dtx (with options: `lua')
--
-- EXPERIMENTAL CODE
--
-- This package is copyright © 2014 Arno L. Trautmann. It may be distributed and/or
-- modified under the conditions of the LaTeX Project Public License, either version 1.3c
-- of this license or (at your option) any later version. This work has the LPPL mainten-
-- ance status ‘maintained’.
function pdf_print (...)
for _, str in ipairs({...}) do
pdf.print(str .. " ")
end
pdf.print("\n")
end
function move (p1,p2)
if (p2) then
pdf_print(p1,p2,"m")
else
pdf_print(p1[1],p1[2],"m")
end
end
function line (p1,p2)
pdf_print(p1,p2,"l")
end
function curve(p11,p12,p21,p22,p31,p32)
if (p22) then
p1,p2,p3 = {p11,p12},{p21,p22},{p31,p32}
else
p1,p2,p3 = p11,p12,p21
end
pdf_print(p1[1], p1[2],
p2[1], p2[2],
p3[1], p3[2], "c")
end
function linewidth (w)
pdf_print(w,"w")
end
function stroke ()
pdf_print("S")
end
-- welp, let's have some fun!
-- with the function radd, a random coordinate change is added if used
-- randfact will adjust the amount of randomization
-- everything is relative in the grid size
-- BUT: In fact, do we really want to have wiggly lines? …
local randfact = 100
local radd = function()
return (math.random()-0.5)*randfact
end
function placelineat(x1,y1,x2,y2)
xfac = tex.pagewidth/gridnrx/65536 -- factors to convert given number to absolute coordinates
yfac = tex.pageheight/gridnry/65536 -- should both be global!
xar = (x2-x1)*xfac -- end point of the arrow
yar = (y2-y1)*yfac --
move(0,0) -- start
line(xar,yar) -- draw main line
stroke()
end
function placearrowat(x1,y1,x2,y2)
xfac = tex.pagewidth/gridnrx/65536 -- factors to convert given number to absolute coordinates
yfac = tex.pageheight/gridnry/65536 -- should both be global!
xar = (x2-x1)*xfac -- end point of the arrow
yar = (y2-y1)*yfac --
parx = xar/math.sqrt(xar^2+yar^2) -- direction of the arrow
pary = yar/math.sqrt(xar^2+yar^2) --
perpx = -pary -- perp of the arrow direction
perpy = parx --
move(0,0) -- start
line(xar,yar) -- draw main line
move(xar,yar)
line(xar-5*parx+5*perpx,yar-5*pary+5*perpy) -- draw arrowhead
move(xar,yar)
line(xar-5*parx-5*perpx,yar-5*pary-5*perpy)
stroke()
end
-- better circle-approximation by using quarter circles, according to wikipedia article about Bézier curves
function placecircleat(radius)
local k = 0.55228
local P0,P1,P2,P3
P0 = {radius,0} P1 = {radius,radius*k}
P2 = {radius*k,radius} P3 = {0,radius}
move (P0[1],P0[2]) curve (P1,P2,P3)
P0 = {-radius,0} P1 = {-radius,radius*k}
P2 = {-radius*k,radius} P3 = {0,radius}
move (P0[1],P0[2]) curve (P1,P2,P3)
P0 = {-radius,0} P1 = {-radius,-radius*k}
P2 = {-radius*k,-radius} P3 = {0,-radius}
move (P0[1],P0[2]) curve (P1,P2,P3)
P0 = {radius,0} P1 = {radius,-radius*k}
P2 = {radius*k,-radius} P3 = {0,-radius}
move (P0[1],P0[2]) curve (P1,P2,P3)
stroke()
end
function placesquareat(length)
move (-length,-length)
line ( length,-length)
line ( length, length)
line (-length, length)
line (-length,-length)
stroke()
end
function placerectangleat(x1,y1,x2,y2)
xfac = tex.pagewidth/gridnrx/65536
yfac = tex.pageheight/gridnry/65536
x2 = (x2-x1)*xfac
y2 = (y2-y1)*yfac
move(0,0)
line(x2,0)
line(x2,y2)
line(0,y2)
line(0,0)
stroke()
end
function placefilledrectangleat(x1,y1,x2,y2)
xfac = tex.pagewidth/gridnrx/65536
yfac = tex.pageheight/gridnry/65536/1.0035 -- well, yes. Another random factor. lalala
x2 = (x2-x1)*xfac
y2 = (y2-y1)*yfac
linewidth(y2)
move(0,y2/2)
line(x2,y2/2)
stroke()
linewidth(1)
end
--
-- End of File `placeat.lua'.
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