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119 lines
3.1 KiB
Lua
119 lines
3.1 KiB
Lua
--[[ $Id: x17.lua 9526 2009-02-13 22:06:13Z smekal $
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Plots a simple stripchart with four pens.
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Copyright (C) 2008 Werner Smekal
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This file is part of PLplot.
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PLplot is free software you can redistribute it and/or modify
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it under the terms of the GNU General Library Public License as published
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by the Free Software Foundation either version 2 of the License, or
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(at your option) any later version.
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PLplot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with PLplot if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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--]]
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-- initialise Lua bindings for PLplot examples.
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dofile("plplot_examples.lua")
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--------------------------------------------------------------------------
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-- main
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--------------------------------------------------------------------------
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nsteps = 1000
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colline = {}
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legline = {}
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-- plplot initialization
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-- Parse and process command line arguments
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pl.parseopts(arg, pl.PL_PARSE_FULL)
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-- User sets up plot completely except for window and data
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-- Eventually settings in place when strip chart is created will be
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-- remembered so that multiple strip charts can be used simultaneously.
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-- Specify some reasonable defaults for ymin and ymax
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-- The plot will grow automatically if needed (but not shrink)
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ymin = -0.1
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ymax = 0.1
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-- Specify initial tmin and tmax -- this determines length of window.
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-- Also specify maximum jump in t
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-- This can accomodate adaptive timesteps
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tmin = 0
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tmax = 10
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tjump = 0.3 -- percentage of plot to jump
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-- Axes options same as plbox.
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-- Only automatic tick generation and label placement allowed
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-- Eventually I'll make this fancier
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colbox = 1
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collab = 3
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styline = { 2, 3, 4, 5 } -- line style
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colline = { 2, 3, 4, 5 } -- pens color
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legline= { "sum", "sin", "sin*noi", "sin+noi" } -- pens legend
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xlab = 0 -- legend position
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ylab = 0.25
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autoy = 1 -- autoscale y
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acc = 1 -- don't scrip, accumulate
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-- Initialize plplot
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pl.init()
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pl.adv(0)
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pl.vsta()
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id1 = pl.stripc("bcnst", "bcnstv",
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tmin, tmax, tjump, ymin, ymax,
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xlab, ylab,
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autoy, acc,
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colbox, collab,
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colline, styline, legline,
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"t", "", "Strip chart demo")
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autoy = 0 -- autoscale y
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acc = 1 -- accumulate
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-- This is to represent a loop over time
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-- Let's try a random walk process
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y1 = 0
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y2 = 0
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y3 = 0
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y4 = 0
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dt = 0.1
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for n = 0, nsteps-1 do
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for i = 0, 200000 do end
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t = n * dt
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noise = pl.randd() - 0.5
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y1 = y1 + noise
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y2 = math.sin(t*math.pi/18)
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y3 = y2 * noise
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y4 = y2 + noise/3
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-- There is no need for all pens to have the same number of
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-- points or beeing equally time spaced.
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if math.mod(n, 2)~=0 then pl.stripa(id1, 0, t, y1) end
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if math.mod(n, 3)~=0 then pl.stripa(id1, 1, t, y2) end
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if math.mod(n, 4)~=0 then pl.stripa(id1, 2, t, y3) end
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if math.mod(n, 5)~=0 then pl.stripa(id1, 3, t, y4) end
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end
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-- Destroy strip chart and it's memory
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pl.stripd(id1)
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pl.plend()
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