line styles not working in plot() ?

[dave-esrd]

I'm trying to use the dashed or dotted line style in a plot, but it seems like this is being ignored by gnuplot. It behaves the same whether I'm using gnuplot 5.4 or 6.0.2, and it doesn't seem to matter what I set GNUTERM to.

I can confirm that in line_spec::plot_string it's adding dashtype '.' Line width, color, marker style and color, all seem to work fine.

UPDATE: ah, I've confirmed that if I save this as a GIF this way:

matplot_fig->backend()->output(filename.c_str(), "gif");
matplot_fig->draw();

...I get solid lines. If I use

matplot_fig->show();

...then I get the specified style. Since my goal is to paint an image on an MFC window inside my own app, not a separate process window, I need to find some way to deal with this...

[dave-esrd]

Something else I discovered: using "gif" as the output format, gnuplot will close the file automatically. But other non-interactive gnuplot terminals (such as pngcairo) don't.

In gnuplot itself, you can use "set output" to flush the file. But backend()->send_command("set output") doesn't work.

The only workaround I can find is this:

   matplot_axes->clear();
   matplot_axes->grid(false);
   matplot_axes->x_axis().visible(false);
   matplot_axes->y_axis().visible(false);
   matplot_fig->save("empty.txt", "dumb");