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Date: Thu, 9 Apr 2020 21:14:30 -0700 (PDT)
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Subject: How to draw polygon on contour plot
From: eridanibrew@gmail.com
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Xref: csiph.com comp.graphics.apps.gnuplot:4316

I would like to draw a polygon on "top of" a contour plot. My code sample b=
elow "almost" gets there; I can see the polygon lines around the edges of t=
he plot, but not the diagonal lines connecting the edge lines. The only rea=
son I can see the edge lines is because I plotted with a line width of 5. T=
he contour coloring seems to cover the diagonal lines.

I don't see a way to attach an image to my post to show the problem in the =
resulting plot:(


[code]
f=3D"PlywoodSpace.csv"
reset
set term windows size 800,1100=20
set pm3d

set dgrid3d
unset surface  # don't need surfaces
set view map
set contour
set key outside
set cntrparam cubicspline  # smooth out the lines
set cntrparam levels 50    # 50 sets the num of contour lines
set pm3d interpolate 20,20 # interpolate the color
# Set a nice color palette
set palette model RGB defined ( 0"black", 1"blue", 2"purple", 3"cyan", 4"gr=
een", 5"yellow", 6"red", 7"white" )
set title "Plywood"  =20

# draw a paddle
set object 1 polygon from -2.5,-4,99 to -3,-3,99 to -3,4,99 to -2.5,5,99 to=
 2.5,5,99 to 3,4,99 to 3,-3,99 to 2.5,-4,99 lw 5  fc rgb "red"=20

# Axes
set tics scale 1,0.2
set format z '%.0f'
unset xtics
unset ytics

# Now plot
splot f using 1:2:3 notitle with lines lt 1

[/code]