Consider switching to pyhgtmap (fork) for contour lines

[quietvoid]

Is your feature request related to a problem? Please describe.

The latest phyghtmap release does not work very well with latest Python and matplotlib versions.
Someone forked it into pyhgtmap however wahoomc has a hardcoded binary to phyghtmap.

Describe the solution you'd like

A way to specify the binary, or maybe setting the default used binary to the new fork while having a fallback to the old version.

Describe alternatives you've considered

Currently I just made a symbolic link, pyhgtmap seems to have backwards compatibility and I was able to create a map.

Unfortunately I think it's not Windows compatible yet: agrenott/pyhgtmap#7

[treee111]

Hi @quietvoid,
thanks for pointing to the fork pyhgtmap! It's a good idea since phyghtmap is difficult to install.

Windows support seams like a blocker for me, so we would have a different tool per OS. With the downsides of enhancing and making documentation more difficult, maybe equalness of results, ...
Supporting both tools for macOS with a switch or "if pyhgtmap is there use it, fallback on phyghtmap" would also have identical downsindes in my opinion.

However I tried it and it works for me on macOS. Feel free to try out the changes in #234 and if it works on your device.

[quietvoid]

Thanks. I haven't tested but the code looks like it would work.
I don't mind sticking to symbolic links, it works with the current wahoomc code.

[billux]

I recently use your PR to use pyhgtmap to workarround #243 (comment).

But I run into a ImportError when calling pyhgtmap. The issue has been reported here: agrenott/pyhgtmap#60. The solution is to downgrade the phx-class-registry depencency:

$ pip install phx-class-registry==4.1.0

FYI I run Arch Linux and wahoomc and its dependencies are installed under a Conda environment.

I was then able to generate tiles with elevation data.

Thanks for your work!