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# $Id: xw03.py 11680 2011-03-27 17:57:51Z airwin $
# Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Alan W. Irwin
# Polar plot demo.
#
# 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
#
from plplot_py_demos import *
# main
#
# Generates polar plot, with 1-1 scaling.
def main():
dtr = pi / 180.0
x0 = cos(dtr*arange(361))
y0 = sin(dtr*arange(361))
# Set up viewport and window, but do not draw box
plenv(-1.3, 1.3, -1.3, 1.3, 1, -2)
# Draw circles for polar grid
for i in range(10):
plarc(0.0, 0.0, 0.1*(i+1), 0.1*(i+1), 0.0, 360.0, 0.0, 0)
plcol0(2)
for i in range(12):
theta = 30.0 * i
dx = cos(dtr * theta)
dy = sin(dtr * theta)
# Draw radial spokes for polar grid
pljoin(0.0, 0.0, dx, dy)
# Write labels for angle
text = `int(theta)`
if theta < 9.99:
offset = 0.45
elif theta < 99.9:
offset = 0.30
else:
offset = 0.15
#Slightly off zero to avoid floating point logic flips at 90 and 270 deg.
if dx >= -0.00001:
plptex(dx, dy, dx, dy, -offset, text)
else:
plptex(dx, dy, -dx, -dy, 1.+offset, text)
# Draw the graph
r = sin((dtr*5.)*arange(361))
x = x0*r
y = y0*r
plcol0(3)
plline(x, y)
plcol0(4)
plmtex("t", 2.0, 0.5, 0.5, "#frPLplot Example 3 - r(#gh)=sin 5#gh")
# Restore defaults
#plcol0(1)
main()
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