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# ex_polygon1.ppl
#
# The code in this file is part of Pyxplot
# <http://www.pyxplot.org.uk>
#
# Copyright (C) 2006-2012 Dominic Ford <coders@pyxplot.org.uk>
# 2008-2012 Ross Church
#
# $Id: ex_polygon2.ppl 1261 2012-07-11 21:38:05Z dcf21 $
#
# Pyxplot is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# You should have received a copy of the GNU General Public License along with
# Pyxplot; if not, write to the Free Software Foundation, Inc., 51 Franklin
# Street, Fifth Floor, Boston, MA 02110-1301, USA
# ----------------------------------------------------------------------------
# This script produces a figure for the Pyxplot Users' Guide
# Call common initialisation script
reset
title = "ex_polygon2"
load "examples/fig_init.ppl"
# BEGIN
rotate(a) = matrix( [cos(a), -sin(a)], \
[sin(a), cos(a)] )
subroutine makePolygon(Nsides, centre)
{
points = []
for i=0 to Nsides
{
call points.append(centre + \
rotate(i/Nsides*unit(rev)) * vector(1,0))
}
polygon points with fillcol gray50 col black
}
set nodisplay ; set multiplot
set texthalign center
set textvalign top
foreach datum x,y,Nsides,name in "--"
{
call makePolygon(Nsides,vector(x,y))
text name at x,y-1.25
}
0 0 3 Triangle
3 0 4 Square
6 0 5 Pentagon
0 4 6 Hexagon
3 4 7 Heptagon
6 4 8 Octagon
END
set display ; refresh
# END
# Call common cleanup script
load "examples/fig_end.ppl"
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