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# Copyright (C) 2001-2016 Alan W. Irwin
# Pie chart 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 numpy import *
text = ["Maurice",
"Geoffrey",
"Alan",
"Rafael",
"Vince"]
# main
#
# Does a simple pie chart.
def main(w):
w.pladv(0)
# Ensure window has aspect ratio of one so circle is
# plotted as a circle.
w.plvasp(1.0)
w.plwind(0., 10., 0., 10.)
#w.plenv(0., 10., 0., 10., 1, -2)
w.plcol0(2)
#if these don't add up to 100, the logic adds to the last to make
#up the balance.
per = [10., 32., 12., 30., 16.]
theta0 = 0
for i in range(5):
#theta quantities scaled as integers to make logic independent of
#floating point considerations.
#n.b. theta multiplied by 2 pi/500 afterward so per is in fact
#interpreted as a percentage.
theta1 = theta0 + int(5.*per[i])
if i == 4:
theta1 = 500
theta = arange(theta0,theta1+1)
x = concatenate((array([5.]), (5. + 3.*cos((2.*pi/500.)*theta))))
y = concatenate((array([5.]), (5. + 3.*sin((2.*pi/500.)*theta))))
w.plcol0(i + 1)
w.plpsty((i + 3) % 8 + 1)
w.plfill(x, y)
w.plcol0(1)
w.plline(x, y)
just = (2.*pi/500.)*(theta0 + theta1) / 2.
dx = .25 * cos(just)
dy = .25 * sin(just)
if (theta0 + theta1) < 250 or (theta0 + theta1) > 750:
just = 0.
else:
just = 1.
mid = int(len(x) / 2)
w.plptex((x[mid] + dx), (y[mid] + dy), 1.0, 0.0, just, text[i])
theta0 = theta[-1]
w.plfont(2)
w.plschr(0., 1.3)
w.plptex(5.0, 9.0, 1.0, 0.0, 0.5, "Percentage of Sales")
# Restore defaults
w.plschr( 0.0, 1.0 )
w.plfont(1)
# Must be done independently because otherwise this changes output files
# and destroys agreement with C examples.
#w.plcol0(1)