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#!/usr/bin/env python
# $Id: xw17.py 9904 2009-05-05 01:09:51Z airwin $
# Copyright 2002 Gary Bishop
# Copyright 2004 Alan W. Irwin
# 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; version 2 of the License.
# 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 the file PLplot; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
# Plots a simple stripchart with four pens.
# Append to effective python path so that can find plplot modules.
from plplot_python_start import *
import sys
from plplot_py_demos import *
# Parse and process command line arguments
plparseopts(sys.argv, PL_PARSE_FULL)
# Initialize plplot
plinit()
from time import sleep
def main():
nsteps = 1000
# If db is used the plot is much more smooth. However, because of the
# async X behaviour, one does not have a real-time scripcharter.
# plsetopt("db", "")
# plsetopt("np", "")
# User sets up plot completely except for window and data
# Eventually settings in place when strip chart is created will be
# remembered so that multiple strip charts can be used simultaneously.
#
# Specify some reasonable defaults for ymin and ymax
# The plot will grow automatically if needed (but not shrink)
ymin = -0.1
ymax = 0.1
# Specify initial tmin and tmax -- this determines length of window.
# Also specify maximum jump in t
# This can accomodate adaptive timesteps
tmin = 0.
tmax = 10.
tjump = 0.3 # percentage of plot to jump
# Axes options same as plbox.
# Only automatic tick generation and label placement allowed
# Eventually I ll make this fancier
colbox = 1
collab = 3
styline = [2, 3, 4, 5]
colline = [2, 3, 4, 5]
legline = ["sum", "sin", "sin*noi", "sin+noi"]
xlab = 0.
ylab = 0.25 # legend position
autoy = 1 # autoscale y
acc = 1 # don t scrip, accumulate
pladv(0)
plvsta()
# Register our error variables with PLplot
# From here on, we're handling all errors here
#plsError(&pl_errcode, errmsg)
id1 = plstripc("bcnst", "bcnstv",
tmin, tmax, tjump, ymin, ymax,
xlab, ylab,
autoy, acc,
colbox, collab,
colline, styline, legline,
"t", "", "Strip chart demo")
# Let plplot handle errors from here on
#plsError(NULL, NULL)
autoy = 0 # autoscale y
acc = 1 # accumulate
# This is to represent a loop over time
# Let's try a random walk process
y1 = y2 = y3 = y4 = 0.0
dt = 0.1
for n in range(nsteps):
sleep(0.01)
t = n * dt
noise = plrandd() - 0.5
y1 = y1 + noise
y2 = sin(t*pi/18.)
y3 = y2 * noise
y4 = y2 + noise/3.
# There is no need for all pens to have the same number of
# points or beeing equally time spaced.
if n%2:
plstripa(id1, 0, t, y1)
if n%3:
plstripa(id1, 1, t, y2)
if n%4:
plstripa(id1, 2, t, y3)
if n%5:
plstripa(id1, 3, t, y4)
# Destroy strip chart and it's memory
plstripd(id1)
# No defaults changed so nothing to restore
main()
plend()
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