/usr/share/doc/libplplot-lua/examples/x25.lua is in libplplot-lua 5.13.0+dfsg-6ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | --[[
Filling and clipping polygons.
Copyright (C) 2008 Werner Smekal
This file is part of PLplot.
PLplot is free software you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published
by the Free Software Foundation either version 2 of the License, or
(at your option) any later version.
PLplot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with PLplot if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
--]]
-- initialise Lua bindings for PLplot examples.
dofile("plplot_examples.lua")
--------------------------------------------------------------------------
-- main
--
-- Test program for filling polygons and proper clipping
--------------------------------------------------------------------------
xextreme = {}
yextreme ={}
x0 = {}
y0 = {}
-- Parse and process command line arguments
pl.parseopts(arg, pl.PL_PARSE_FULL)
-- Initialize plplot
pl.ssub(3, 3)
pl.init()
xextreme = { { -120, 120 }, { -120, 120 }, { -120, 120 }, { -80, 80 }, { -220, -120 },
{ -20, 20 }, { -20, 20 }, { -80, 80 }, { 20, 120 } }
yextreme = { { -120, 120 }, { 20, 120 }, { -20, 120 }, { -20, 120 }, { -120, 120 },
{ -120, 120 }, { -20, 20 }, { -80, 80 }, { -120, 120 } }
for k = 1, 2 do
for j = 1, 4 do
if j==1 then
-- Polygon 1: a diamond
x0 = { 0, -100, 0, 100 }
y0 = { -100, 0, 100, 0}
end
if j==2 then
-- Polygon 1: a diamond - reverse direction
x0 = { 100, 0, -100, 0 }
y0 = { 0, 100, 0, -100}
end
if j==3 then
-- Polygon 2: a square with punctures
x0 = { -100, -100, 80, -100, -100, -80, 0, 80, 100, 100 }
y0 = { -100, -80, 0, 80, 100, 100, 80, 100, 100, -100}
end
if j==4 then
-- Polygon 2: a square with punctures - reversed direction
x0 = { 100, 100, 80, 0, -80, -100, -100, 80, -100, -100 }
y0 = { -100, 100, 100, 80, 100, 100, 80, 0, -80, -100}
end
for i = 1, 9 do
pl.adv(0)
pl.vsta()
pl.wind(xextreme[i][1], xextreme[i][2], yextreme[i][1], yextreme[i][2])
pl.col0(2)
pl.box("bc", 1, 0, "bcnv", 10, 0)
pl.col0(1)
pl.psty(0)
if k==1 then
pl.fill(x0, y0)
else
pl.gradient(x0, y0, 45.)
end
pl.col0(2)
pl.lsty(1)
pl.line(x0, y0)
end
end
end
-- Don't forget to call plend() to finish off!
pl.plend()
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