Make sure that having a LaTeX distribution is optional

[leotrs]

As mentioned in #23.

The installation instructions in the README should allow users who will not use/need LaTeX, but only text.

The installation instructions in the README should guide the user to install a suitable (preferably small) LaTeX distribution in as many platforms as possible (Windows/MacOS/Linux).

Tests should be aware of this being optional. For example, a fresh installation of manim (without latex) will not pass tests that require LaTeX.

[leotrs]

Originally from @kilacoda in #28:

We could implement a check in manimlib.imports for that I think. Something like

if latex_installed():
    from manimlib.mobject.types.svg.tex_mobject import *

[TonyCrane]

For users who do not have LaTeX installed, what about adding an option to use the website API to render LaTeX formulas(get SVG file directly) online instead of the local offline rendering.

Like this, using the LaTeX rendering API on the Zhihu website in China will directly return the rendered svg file.

https://www.zhihu.com/equation?tex=...

There may also be better APIs to choose from, but I may know less.

For some people, they want to write some simple formulas with LaTeX, but they can't handle the installation of LaTeX, or they can't afford a large capacity. I think online rendering is a good solution at this time. But for those who want to use other LaTeX features, they may also need to install the LaTeX distribution.

(I’m in a poor English.Hope that you can understand me.)

[safinsingh]

This is a really creative solution, but it would require people to always have internet. Honestly, that shouldn't be much of a problem though, so maybe we could add a flag for it. Thanks!

[leotrs]

@tony031218 your English is perfectly understandable! You propose a very interesting solution. As with most new features, I think it comes down to: if we offer it as an alternative, users will expect us to maintain it. If the online service we choose happens to change their API, or it has privacy or security issues, or if it just stops working altogether, we are going to receive a barrage of issues about a feature that we cannot control. We would be trading the barrage of features about miktex, with a barrage of features about this feature. Is it worth it? I don't know

[TonyCrane]

I simply implemented this feature and will improve it later.

Currently I plan to use Zhihu's API, but if this function is used by enough people, maybe we can build a server by ourselves.

Online rendering is just an alternative, we still recommend using offline rendering.

[leotrs]

I really don't think we should implement the server ourselves. That sounds like orthogonal to manim, and like a whole very different project.

[kilacoda]

This is a really creative solution, but it would require people to always have internet. Honestly, that shouldn't be much of a problem though, so maybe we could add a flag for it. Thanks!

We could probably add that part in a try-except block, like

try:
    download_latex_image_online()
except ConnectionError:
    print("No internet connectivity. Aborting latex download.")

(assuming ConnectionError is defined somewhere.)

[TonyCrane]

After about two hours, I will submit a pr, then you can try it and make some suggestions. I'm going to take an exam now.

[eulertour]

I don't think we should build code making web requests to private servers into manim. Even if we put the complexity of the issue aside, it's a pretty niche issue and gets us into a potential privacy issue that we can avoid entirely.

[PgBiel]

I don't think we should build code making web requests to private servers into manim. Even if we put the complexity of the issue aside, it's a pretty niche issue and gets us into a potential privacy issue that we can avoid entirely.

I agree. We can, however, make this extendable, i.e., people should be allowed to handle this in their own away. In this sense, this falls into the discussion about manim addons. I feel the need for an issue about this

[eulertour]

We can, however, make this extendable, i.e., people should be allowed to handle this in their own away. In this sense, this falls into the discussion about manim addons.

This I can totally get behind, if someone provides an extension/addon and some people want to download it, that's perfectly fine.

[TonyCrane]

I'm sorry you are not satisfied with my plan.

I made this suggestion not to make online rendering a complete replacement for the LaTeX distribution, but to provide a solution for those who cannot successfully install LaTeX or are unwilling to install the distribution, that is, to connect to the Internet for online rendering.

This has many limitations, such as the inability to use LaTeX's other functions and macro packages flexibly, and as you said, it is not good to send requests to the server frequently (but in fact, these APIs excuse the processing time is very short, and there are many People use them via links).

You can see my implementation here: https://github.com/Tony031218/manim/tree/online-latex
And there are still many contents that need to be improved, such as handling LaTeX formulas that are wrong, the output log file, and the svg generated with Chinese characters will contain text elements, etc.

btw, do I need or can I submit a pr to this repo?