Segments drag and anchor move problem.

[coldzeraaaaa]

Introduction

Dear JointJs developers,

Sorry for bother you.

I want implement orthogonality of link and drag-and-drop function of segments.
And I found solution from this question .

I use these code implement tools:

Then I found that there is a mistake when I try to drag a l segment which one end connected to an anchor.
As this video shows, if I drag this segment move in scope of rectangle, the anchor coordinate is right. But if I drag beyond the rectangle, I will find that the anchor appears at the beginning of the drag.

bandicam.2025-09-09.15-32-21-508.mp4

What I want is :

If u know the reason and how to solve it, plz teach me.
Thanks very much, and sorry again.

Steps to reproduce

No response

Restrictions & Constraints

No response

Does your question relate to JointJS or JointJS+. Select both if applicable.

JointJS+

[kumilingus]

Are you able to reproduce the issue here?

[coldzeraaaaa]

I’m very sorry—yesterday my network connection was extremely unstable, and I couldn’t log in to that website.
Today I managed to log back in and added the anchor tool, so that we can see this issue more clearly.

Here’s the link： eg

I’ve tried reading the JointJS source code and experimenting with anchor movement or segment dragging to fix this problem, but all attempts have failed.

AI gave me one possible explanation, though I’m not sure if it’s correct:

1. When dragging a segment, the anchor doesn’t actually move.
2. The anchor that appears to move is just an animation.
3. Only when the segment drag ends does the anchor truly update, and then the path is recalculated.
4. If the movement exceeds the anchor’s allowed range, the animation state ends.

I’ve already tried searching, but I haven’t found any reliable examples.
If you could provide me with some ideas or possible causes, I would be extremely grateful.

Thank you very much for taking the time to help me.