#1969 Aquaterm: plot using third column for color palette value loses every 2nd line

[Anonymous]

If you execute the script below using gnuplot Version 5.0 patchlevel 5 on mac OSX 10.12.6 only every other line in the polar plot is plotted. If you do not use a third column to color the lines, then all lines are plotted. If you use points instead of lines, all points are plotted in the right color.

set polar
set angles degrees #set gnuplot on degrees instead of radians

set xrange [-14:14]
set yrange [-14:14]

set size square

set cbrange [7:14]

set palette defined ( 7 0.05 0.05 0.2, 8 0 0 1, 9 0.7 0.85 0.9, 10 0 0.75 0, 11 1 1 0, 12 1 0 0, 13 0.6 0.6 0.6, 14 0.95 0.95 0.95 )

plot "-" u 1:2:2 with lines notitle lc palette z
0 8
30 12
60 8
90 12
120 8
150 12
180 8
210 12
240 8
270 12
300 8
330 12
360 8
e

[Karl Ratzsch]

No problem on windows with an old 5.0pl1 or 5.0pl6 or the new 5.2pl0, I get a star with lines of alternating (red and blue) colours.

It'd be strange if this was mac-specific, I guess you have mixed up sth. in your palette and are plotting every other line in white. Can you add a third column for the colour and fill it with a different sequence of numbers to make sure the problem is real?

[Frank Selten]

!/bin/bash

cat > plot.gp <<==
set polar
set angles degrees #set gnuplot on degrees instead of radians

set xrange [-14:14] #make gnuplot to go until 6000
set yrange [-14:14]

set size square

set cbrange [7:14]

set palette defined ( 7 0.05 0.05 0.2, 8 0 0 1, 9 0.7 0.85 0.9,\ 10 0 0.75 0, 11 1 1 0, 12 1 0 0, 13 0.6 0.6 0.6,\ 14 0.95 0.95 0.95 )

plot "-" u 1:2:3 with lines notitle lc palette z
0 8 7
30 12 7.4
60 8 7.8
90 12 8.2
120 8 8.6
150 12 9.0
180 8 9.4
210 12 9.8
240 8 10.2
270 12 10.6
300 8 11.0
330 12 11.4
360 8 11.8
e
==

gnuplot < plot.gp

[Frank Selten]

problem persists, just every other line is plotted

[Frank Selten]

Here is a screenshot

[Frank Selten]

Here is the screenshot, i hope

[Ethan Merritt]

I cannot reproduce the problem here.
Could it be a terminal driver problem? Does the same thing happen if you set the terminal type to postscript or pdf?

[Frank Selten]

You are right! The pdf terminal produces all colored lines, thanks!

[Ethan Merritt]

OK. But what terminal were you using before? Was it aquaterm? If so you could try reporting it as a bug to the aquaterm project
https://sourceforge.net/projects/aquaterm/

[Frank Selten]

Indeed, aquaterm, I'll try and report there, thanks again!

[Ethan Merritt]

Fixed in upstream AquaTerm source code in the SourceForge git repository February 2025.