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Newsgroups: comp.graphics.apps.gnuplot
Date: Sun, 12 Apr 2020 16:14:00 -0700 (PDT)
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Subject: Re: How to draw polygon on contour plot
From: eridanibrew@gmail.com
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Xref: csiph.com comp.graphics.apps.gnuplot:4318

On Thursday, April 9, 2020 at 9:14:32 PM UTC-7, erida...@gmail.com wrote:
> I would like to draw a polygon on "top of" a contour plot. My code sample=
 below "almost" gets there; I can see the polygon lines around the edges of=
 the plot, but not the diagonal lines connecting the edge lines. The only r=
eason I can see the edge lines is because I plotted with a line width of 5.=
 The contour coloring seems to cover the diagonal lines.
>=20
> I don't see a way to attach an image to my post to show the problem in th=
e resulting plot:(
>=20
>=20
> [code]
> f=3D"PlywoodSpace.csv"
> reset
> set term windows size 800,1100=20
> set pm3d
>=20
> 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"=
green", 5"yellow", 6"red", 7"white" )
> set title "Plywood"  =20
>=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
>=20
> # Axes
> set tics scale 1,0.2
> set format z '%.0f'
> unset xtics
> unset ytics
>=20
> # Now plot
> splot f using 1:2:3 notitle with lines lt 1
>=20
> [/code]

Tried a million differrent things to try and get the polygon object to show=
 up on top. Finally figured out to
do splot
now define the object polygon with "front"
replot

Now the object shows up higher than than the contour.