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Newsgroups: comp.graphics.apps.gnuplot
Date: Tue, 17 Jan 2017 04:49:17 -0800 (PST)
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Subject: Re: plotting an adaptive mesh
From: maierd83@gmail.com
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Xref: csiph.com comp.graphics.apps.gnuplot:3532

Thanks for your answer Karl.

My idea is to minimize the size of the data file and the image file. Furthe=
rmore, I want to reduce the calculation time of my program. At the moment t=
he expanding of the adaptive mesh to a regular mesh takes longer than the c=
alculation of the adaptive mesh data.

So, I want definitely get rid of the idea of expansion.

As adaptive meshing seems not to be supported by gnuplot directly, I want t=
o use some gnuplot plotting utilities to make it by myself. My idea:
1) Finding with stats the min and max value of my data.
2) Make a color palette according to the min and max values.
3) Plot each data point as a rectangle with the fillcolor equal to the=20
   color defined according to the color palette

The finer pitched data points (smaller rectangles) shall then be plotted on=
 top of the bigger rectangles.

I hope I can do point 1) and 2) by myself, but I see problems on point 3):
how can I plot a rectangle with a fillcolor defined by the index of a color=
bar? Something like (not working):
set obj rect cen 4,5 size 1,3 fc colorbar(5.3)


At the moment I am playing with this example:

reset
set terminal svg size 800,600
set output "./test.svg"

set style rect fc lt -1 fs noborder

#stats 'data.dat' using 3 prefix "A"
set xrange [2 : 8]
set yrange [2 : 8]

set pm3d
set palette defined (0 "black", 100 "blue", 200 "red", 300 "orange", 500 "w=
hite")

set obj rect cen 4,5 size 1,3 fc rgb "#5FD8F0"
set obj rect cen 5,4 size 1,1 fc rgb "#5FD800"
set obj rect cen 5,5 size 1,1 fc rgb "#9FD900"
set obj rect cen 5,6 size 1,1 fc rgb "#CFDA00"
set obj rect cen 6,5 size 1,3 fc rgb "#FFDB00"

plot x



I don't know if this is a reasonable way to go....