Feature/checkpoints support

[Qoolerus]

Support of Checkpoints

[K-4U]

Hi, can this be merged? I'm struggling with LibAvoid making my connections pretty, and i think i can fix it with these checkpoints.

[Aksem]

@Qoolerus thank you for the contribution!

[Aksem]

@K-4U Thanks for the reminder. I wasn’t sure about the changes in the typings, but I’ve just tested them, and they’re correct. Merged! A new beta version v0.5.0-beta.3 has been released as well.

[K-4U]

@K-4U Thanks for the reminder. I wasn’t sure about the changes in the typings, but I’ve just tested them, and they’re correct. Merged! A new beta version v0.5.0-beta.3 has been released as well.

Aahh, awesome. Thank you! I've been using libavoid to work together with ELK, as ELK doesn't do the whole edge-routing without nodes moving.
Thank you for your work on this port, otherwise i would've never gotten so far with my webapp!

[Qoolerus]

Hi, can this be merged? I'm struggling with LibAvoid making my connections pretty, and i think i can fix it with these checkpoints.

Good evening! Please note that this PR introduces changes to the beta version, the "new-emsdk-and-embed" branch. This version has some differences in interfaces compared to 0.4.5, because it uses a different binder - Embind. But migration is quite simple and fast.
At first, I tried to support checkpoints in the main branch, but unfortunately, due to the limitations of the WebIDL binder, I couldn't do this, it's good that the library author has a beta branch :)

[K-4U]

Hi, can this be merged? I'm struggling with LibAvoid making my connections pretty, and i think i can fix it with these checkpoints.

Good evening! Please note that this PR introduces changes to the beta version, the "new-emsdk-and-embed" branch. This version has some differences in interfaces compared to 0.4.5, because it uses a different binder - Embind. But migration is quite simple and fast. At first, I tried to support checkpoints in the main branch, but unfortunately, due to the limitations of the WebIDL binder, I couldn't do this, it's good that the library author has a beta branch :)

Hah, yeah think i'm running into that, lots of "Cannot convert 'undefined' to " things. Thought it was just me at first, but looks like all enums aren't being filled now.
I didn't find any direct documentation changes though, so i had expected everything to just work as normal. Silly me.

[K-4U]

Hi, can this be merged? I'm struggling with LibAvoid making my connections pretty, and i think i can fix it with these checkpoints.

Good evening! Please note that this PR introduces changes to the beta version, the "new-emsdk-and-embed" branch. This version has some differences in interfaces compared to 0.4.5, because it uses a different binder - Embind. But migration is quite simple and fast. At first, I tried to support checkpoints in the main branch, but unfortunately, due to the limitations of the WebIDL binder, I couldn't do this, it's good that the library author has a beta branch :)

Hah, yeah think i'm running into that, lots of "Cannot convert 'undefined' to " things. Thought it was just me at first, but looks like all enums aren't being filled now. I didn't find any direct documentation changes though, so i had expected everything to just work as normal. Silly me.

Update: It helps to read some of the other MR's commits. I eventually found that they're now further moved into some objects. Probably more of a C thing than a nodejs thing, but i don't care.

One thing is that the ConnDirFlags has a big //todo in it. So i just looked into the C documentation of libavoid.

For anybody stumbling upon this closed MR, this'll help:

    const getDirFlag: any = (pos: string) => {
        const p = pos.toLowerCase();
        // These values are bit flags, so we can combine them for corners. The default (no match) is 15 (all directions allowed).
        if (p === 'right') return 8;
        if (p === 'left') return 4;
        if (p === 'top') return 1;
        if (p === 'bottom') return 2;
        return 15;
    };

[kumilingus]

Great job! The checkpoints are working really well! See our example.

I only noticed a minor issue: setting checkpoints doesn’t mark connectors as dirty / trigger re-routing (#34).

Also, I occasionally see warnings like:

"Warning: skipping checkpoint for connector 7 at (400, 140)."

Is there a way to suppress these warnings?