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--[[
Mesh plot demo.
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")
XPTS = 35 -- Data points in x
YPTS = 46 -- Data points in y
LEVELS = 10
opt = { pl.DRAW_LINEXY, pl.DRAW_LINEXY }
alt = { 33, 17 }
az = { 24, 115 }
title = {
"#frPLplot Example 11 - Alt=33, Az=24, Opt=3",
"#frPLplot Example 11 - Alt=17, Az=115, Opt=3" }
-- bitwise or operator from http://lua-users.org/wiki/BaseSixtyFour
-- (c) 2006-2008 by Alex Kloss
-- licensed under the terms of the LGPL2
-- return single bit (for OR)
function bit(x,b)
return ((x % 2^b) - (x % 2^(b-1)) > 0)
end
-- logic OR for number values
function lor(x,y)
result = 0
for p=1,8 do result = result + (((bit(x,p) or bit(y,p)) == true) and 2^(p-1) or 0) end
return result
end
function cmap1_init()
i = { 0, 1 } -- left boundary , right boundary
h = { 240, 0 } -- blue -> green -> yellow -> red
l = { 0.6, 0.6 }
s = { 0.8, 0.8 }
pl.scmap1n(256)
pl.scmap1l(0, i, h, l, s)
end
----------------------------------------------------------------------------
-- main
--
-- Does a series of mesh plots for a given data set, with different
-- viewing options in each plot.
----------------------------------------------------------------------------
nlevel = LEVELS
clevel = {}
-- Parse and process command line arguments
pl.parseopts(arg, pl.PL_PARSE_FULL)
-- Initialize plplot
pl.init()
x = {}
y = {}
z = {}
for i=1, XPTS do
x[i] = 3 * (i-1-math.floor(XPTS/2)) / math.floor(XPTS/2)
end
for i=1, YPTS do
y[i] = 3 * (i-1-math.floor(YPTS/2)) / math.floor(YPTS/2)
end
for i=1, XPTS do
xx = x[i]
z[i] = {}
for j=1, YPTS do
yy = y[j]
z[i][j] = 3 * (1-xx)^2 * math.exp(-xx^2 - (yy+1.)^2) -
10 * (xx/5 - xx^3 - yy^5) * math.exp(-xx^2-yy^2) -
1/3 * math.exp(-(xx+1)^2 - yy^2)
-- Jungfraujoch/Interlaken
if false then
if z[i][j] < -1 then z[i][j] = -1 end
end
end
end
zmax, zmin = pl.MinMax2dGrid(z)
step = (zmax - zmin)/(nlevel+1)
for i=1, nlevel do
clevel[i] = zmin + step + step*(i-1)
end
cmap1_init()
for k=1, 2 do
for i=1, 4 do
pl.adv(0)
pl.col0(1)
pl.vpor(0, 1, 0, 0.9)
pl.wind(-1, 1, -1, 1.5)
pl.w3d(1, 1, 1.2, -3, 3, -3, 3, zmin, zmax, alt[k], az[k])
pl.box3("bnstu", "x axis", 0, 0,
"bnstu", "y axis", 0, 0,
"bcdmnstuv", "z axis", 0, 4)
pl.col0(2)
-- wireframe plot
if i==1 then
pl.mesh(x, y, z, opt[k])
end
-- magnitude colored wireframe plot
if i==2 then
pl.mesh(x, y, z, lor(opt[k], pl.MAG_COLOR))
end
-- magnitude colored wireframe plot with sides
if i==3 then
pl.plot3d(x, y, z, lor(opt[k], pl.MAG_COLOR), 1)
end
-- magnitude colored wireframe plot with base contour
if i==4 then
pl.meshc(x, y, z, lor(lor(opt[k], pl.MAG_COLOR), pl.BASE_CONT), clevel)
end
pl.col0(3)
pl.mtex("t", 1, 0.5, 0.5, title[k])
end
end
-- Clean up
pl.plend()
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