[Maxima-bugs] [maxima:bugs] #4294 Package draw and plot2d Gnuplot line type interaction

[Jaime E. V. <vi...@us...>]

This bug could be solved if instead of trying to reset Gnuplot before any new plot comand we close the pipe to Gnuplot and open a new one. I believe the only advantages that we currently have by using gnuplot_pipes instead of gnuplot is that we don't need any temporary files and the plot window remains active, thus allowing things such as rotating a 3d surface. I don't think using a new pipe everytime will have disadvantages compared to keeping the same pipe opened. If anyone can think of disadvantages please speak; otherwise I will go on and introduce that change.


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**[bugs:#4294] Package draw and plot2d Gnuplot line type interaction**

**Status:** open
**Group:** None
**Labels:** plotting plot2d draw gnuplot 
**Created:** Mon Apr 22, 2024 11:31 PM UTC by Robert Dodier
**Last Updated:** Sun Aug 04, 2024 09:09 PM UTC
**Owner:** nobody


Working with Git version ff883f3. `gnuplot --version` reports: `gnuplot 5.4 patchlevel 2`

I am working on Linux.

I noticed an interaction between the draw package and plot2d. First time I try plot2d, I see all solid lines as expected.
```
(%i1) plot2d (makelist (sin(k*x), k, 1, 10), [x, 0, 10]) $
```
Now I load the draw package and draw something, and then try the same plot2d as before.
```
(%i2) load (draw) $
(%i3) draw2d (rectangle ([0, 0], [10, 1])) $
(%i4) plot2d (makelist (sin(k*x), k, 1, 10), [x, 0, 10]) $
```
That second plot2d shows that the curves are drawn with a variety of line types, not just a solid line. Some are dashed, some dotted, etc.

I'm guessing the state of the Gnuplot process has gotten changed. If I set the plot_format to gnuplot, which executes a separate Gnuplot process instead of talking through a pipe, I see all solid lines as expected.
```
(%i5) plot2d (makelist (sin(k*x), k, 1, 10), [x, 0, 10], [plot_format, gnuplot]) $
```


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