Link curves need to be adjusted

[smilediver]

In some cases curves in links start intersecting with each other creating a confusing mess. It needs a better way of calculating control points.

Maybe there could also be a choice to use straight links, something like this:

Accidentally found this interesting example of disproportionate in/out control points:

[Nelarius]

The first screenshot is definitely a bit of a mess. Link control points are currently scaled based on the link's length. Changing control points to something constant looks like this:

Better, but it looks a bit funny for longer links.

ImNodes could use some work on link shapes.

• Better control point placement. Do you have any further information from the disproportionate in/out control point example?
• Different link shapes. I think straight lines could be implemented fairly easily.