##checkerboard_input.txt
#
#  Discussion:
#
#    Draw an 8 x 8 checkerboard of red and black squares.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    09 September 2013
#
#  Author:
#
#    John Burkardt
#
set term png
set output "checkers.png"
#
#  Our plot is in the range 0 <= x <= 8, 0 <= y <= 8:
#
set xrange [ 0.0 : 8.0 ]
set yrange [ 0.0 : 8.0 ]
#
#  We don't want a legend box to appear listing the data
#  we are displaying.
#
set nokey
#
#  Set the title of the plot.
#
set title "Checkers on board"
#
#  Suppress the display of tics and labels along the axes.
#
unset tics
#
#  Make X and Y axes the same length.
#
set size ratio 1
#
#  Circles are to be filled with color.
#
set style fill solid
#
#  Define 64 red and black circles.
#
set object circle at 0.5, 0.5 size 0.45 fc rgb "red"
set object circle at 1.5, 0.5 size 0.45 fc rgb "black"
set object circle at 2.5, 0.5 size 0.45 fc rgb "red"
set object circle at 3.5, 0.5 size 0.45 fc rgb "black"
set object circle at 4.5, 0.5 size 0.45 fc rgb "red"
set object circle at 5.5, 0.5 size 0.45 fc rgb "black"
set object circle at 6.5, 0.5 size 0.45 fc rgb "red"
set object circle at 7.5, 0.5 size 0.45 fc rgb "black"

set object circle at 0.5, 1.5 size 0.45 fc rgb "black"
set object circle at 1.5, 1.5 size 0.45 fc rgb "red"
set object circle at 2.5, 1.5 size 0.45 fc rgb "black"
set object circle at 3.5, 1.5 size 0.45 fc rgb "red"
set object circle at 4.5, 1.5 size 0.45 fc rgb "black"
set object circle at 5.5, 1.5 size 0.45 fc rgb "red"
set object circle at 6.5, 1.5 size 0.45 fc rgb "black"
set object circle at 7.5, 1.5 size 0.45 fc rgb "red"

set object circle at 0.5, 2.5 size 0.45 fc rgb "red"
set object circle at 1.5, 2.5 size 0.45 fc rgb "black"
set object circle at 2.5, 2.5 size 0.45 fc rgb "red"
set object circle at 3.5, 2.5 size 0.45 fc rgb "black"
set object circle at 4.5, 2.5 size 0.45 fc rgb "red"
set object circle at 5.5, 2.5 size 0.45 fc rgb "black"
set object circle at 6.5, 2.5 size 0.45 fc rgb "red"
set object circle at 7.5, 2.5 size 0.45 fc rgb "black"

set object circle at 0.5, 3.5 size 0.45 fc rgb "black"
set object circle at 1.5, 3.5 size 0.45 fc rgb "red"
set object circle at 2.5, 3.5 size 0.45 fc rgb "black"
set object circle at 3.5, 3.5 size 0.45 fc rgb "red"
set object circle at 4.5, 3.5 size 0.45 fc rgb "black"
set object circle at 5.5, 3.5 size 0.45 fc rgb "red"
set object circle at 6.5, 3.5 size 0.45 fc rgb "black"
set object circle at 7.5, 3.5 size 0.45 fc rgb "red"

set object circle at 0.5, 4.5 size 0.45 fc rgb "red"
set object circle at 1.5, 4.5 size 0.45 fc rgb "black"
set object circle at 2.5, 4.5 size 0.45 fc rgb "red"
set object circle at 3.5, 4.5 size 0.45 fc rgb "black"
set object circle at 4.5, 4.5 size 0.45 fc rgb "red"
set object circle at 5.5, 4.5 size 0.45 fc rgb "black"
set object circle at 6.5, 4.5 size 0.45 fc rgb "red"
set object circle at 7.5, 4.5 size 0.45 fc rgb "black"

set object circle at 0.5, 5.5 size 0.45 fc rgb "black"
set object circle at 1.5, 5.5 size 0.45 fc rgb "red"
set object circle at 2.5, 5.5 size 0.45 fc rgb "black"
set object circle at 3.5, 5.5 size 0.45 fc rgb "red"
set object circle at 4.5, 5.5 size 0.45 fc rgb "black"
set object circle at 5.5, 5.5 size 0.45 fc rgb "red"
set object circle at 6.5, 5.5 size 0.45 fc rgb "black"
set object circle at 7.5, 5.5 size 0.45 fc rgb "red"

set object circle at 0.5, 6.5 size 0.45 fc rgb "red"
set object circle at 1.5, 6.5 size 0.45 fc rgb "black"
set object circle at 2.5, 6.5 size 0.45 fc rgb "red"
set object circle at 3.5, 6.5 size 0.45 fc rgb "black"
set object circle at 4.5, 6.5 size 0.45 fc rgb "red"
set object circle at 5.5, 6.5 size 0.45 fc rgb "black"
set object circle at 6.5, 6.5 size 0.45 fc rgb "red"
set object circle at 7.5, 6.5 size 0.45 fc rgb "black"

set object circle at 0.5, 7.5 size 0.45 fc rgb "black"
set object circle at 1.5, 7.5 size 0.45 fc rgb "red"
set object circle at 2.5, 7.5 size 0.45 fc rgb "black"
set object circle at 3.5, 7.5 size 0.45 fc rgb "red"
set object circle at 4.5, 7.5 size 0.45 fc rgb "black"
set object circle at 5.5, 7.5 size 0.45 fc rgb "red"
set object circle at 6.5, 7.5 size 0.45 fc rgb "black"
set object circle at 7.5, 7.5 size 0.45 fc rgb "red"
#
set timestamp
#
#  I seem to need to have a PLOT command or the boxes don't show up.
#  I wish I knew how to NOT to have to do this!
#
plot 0
#
#  All done.
#
quit