##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:
#
#    14 October 2013
#
#  Author:
#
#    John Burkardt
#
set term png
set output "checkerboard.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 "Checkerboard"
#
#  Suppress the display of tics and labels along the axes.
#
unset tics
#
#  Make X and Y axes the same length.
#
set size ratio 1
#
#  Define 64 red and black boxes, tediously, by listing
#  their lower left and upper right corners.
#
set object rectangle from 0,0 to 1,1 fc rgb "red"
set object rectangle from 1,0 to 2,1 fc rgb "black"
set object rectangle from 2,0 to 3,1 fc rgb "red"
set object rectangle from 3,0 to 4,1 fc rgb "black"
set object rectangle from 4,0 to 5,1 fc rgb "red"
set object rectangle from 5,0 to 6,1 fc rgb "black"
set object rectangle from 6,0 to 7,1 fc rgb "red"
set object rectangle from 7,0 to 8,1 fc rgb "black"

set object rectangle from 0,1 to 1,2 fc rgb "black"
set object rectangle from 1,1 to 2,2 fc rgb "red"
set object rectangle from 2,1 to 3,2 fc rgb "black"
set object rectangle from 3,1 to 4,2 fc rgb "red"
set object rectangle from 4,1 to 5,2 fc rgb "black"
set object rectangle from 5,1 to 6,2 fc rgb "red"
set object rectangle from 6,1 to 7,2 fc rgb "black"
set object rectangle from 7,1 to 8,2 fc rgb "red"

set object rectangle from 0,2 to 1,3 fc rgb "red"
set object rectangle from 1,2 to 2,3 fc rgb "black"
set object rectangle from 2,2 to 3,3 fc rgb "red"
set object rectangle from 3,2 to 4,3 fc rgb "black"
set object rectangle from 4,2 to 5,3 fc rgb "red"
set object rectangle from 5,2 to 6,3 fc rgb "black"
set object rectangle from 6,2 to 7,3 fc rgb "red"
set object rectangle from 7,2 to 8,3 fc rgb "black"

set object rectangle from 0,3 to 1,4 fc rgb "black"
set object rectangle from 1,3 to 2,4 fc rgb "red"
set object rectangle from 2,3 to 3,4 fc rgb "black"
set object rectangle from 3,3 to 4,4 fc rgb "red"
set object rectangle from 4,3 to 5,4 fc rgb "black"
set object rectangle from 5,3 to 6,4 fc rgb "red"
set object rectangle from 6,3 to 7,4 fc rgb "black"
set object rectangle from 7,3 to 8,4 fc rgb "red"

set object rectangle from 0,4 to 1,5 fc rgb "red"
set object rectangle from 1,4 to 2,5 fc rgb "black"
set object rectangle from 2,4 to 3,5 fc rgb "red"
set object rectangle from 3,4 to 4,5 fc rgb "black"
set object rectangle from 4,4 to 5,5 fc rgb "red"
set object rectangle from 5,4 to 6,5 fc rgb "black"
set object rectangle from 6,4 to 7,5 fc rgb "red"
set object rectangle from 7,4 to 8,5 fc rgb "black"

set object rectangle from 0,5 to 1,6 fc rgb "black"
set object rectangle from 1,5 to 2,6 fc rgb "red"
set object rectangle from 2,5 to 3,6 fc rgb "black"
set object rectangle from 3,5 to 4,6 fc rgb "red"
set object rectangle from 4,5 to 5,6 fc rgb "black"
set object rectangle from 5,5 to 6,6 fc rgb "red"
set object rectangle from 6,5 to 7,6 fc rgb "black"
set object rectangle from 7,5 to 8,6 fc rgb "red"

set object rectangle from 0,6 to 1,7 fc rgb "red"
set object rectangle from 1,6 to 2,7 fc rgb "black"
set object rectangle from 2,6 to 3,7 fc rgb "red"
set object rectangle from 3,6 to 4,7 fc rgb "black"
set object rectangle from 4,6 to 5,7 fc rgb "red"
set object rectangle from 5,6 to 6,7 fc rgb "black"
set object rectangle from 6,6 to 7,7 fc rgb "red"
set object rectangle from 7,6 to 8,7 fc rgb "black"

set object rectangle from 0,7 to 1,8 fc rgb "black"
set object rectangle from 1,7 to 2,8 fc rgb "red"
set object rectangle from 2,7 to 3,8 fc rgb "black"
set object rectangle from 3,7 to 4,8 fc rgb "red"
set object rectangle from 4,7 to 5,8 fc rgb "black"
set object rectangle from 5,7 to 6,8 fc rgb "red"
set object rectangle from 6,7 to 7,8 fc rgb "black"
set object rectangle from 7,7 to 8,8 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 do this.
#
plot 1
#
#  All done.
#
quit