Fabric.js: updating the coordinates when the polygon is moved?

[volkanciloglu]

scenario:
I will change the location of the polygon after creating the polygon (selectable). Send the coordinates after the change is complete.

problem:
reads the first coordinates of the created polygon. not the coordinates at the current location.

[asturur]

This is a recurring problem and request.
Polygon has been answered on stackoverflow, and the line is very similar.

Since a line can be done with a polyline and polygon and polyline share the same class, at this point i ll probably add a method to calculate them.

Meanwhile please try to look on stackoverow or in the closed issue here i m sure we answered.

[volkanciloglu]

you say " there is no solution for now."
Did I get right?.

[asturur]

i posted the solution somewhere either in this issue tracker on
stackoverflow.

I do not remember when and where.

On 1 Mar 2018 10:09 am, "volkanciloglu" [e-mail] wrote:

you say you do not have a solution for now.
Did I get right?.

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[volkanciloglu]

Thank you. I get it now. My English is not very good.

[samael205]

When you find something related to this, could you please notify? @volkanciloglu
I will do the same

[asturur]

fabricjs polygon points search on stack overflow, on of the top results was good

https://stackoverflow.com/questions/38999034/how-does-transforming-points-with-a-transformmatrix-work-in-fabricjs#

the accepted answer, contains a couple of lines that returns you the updated points in canvas coordinates

[asturur]

If you can upvote the answer, someone will find it easier next time.

[CKitisak]

@asturur Would you please give me some advice on my case?
I have tried the link you mentioned above but it didn't work.
here is my code: https://jsfiddle.net/ckitisak/3rwv1ae9/20/

I also have posted my question in SO.
https://stackoverflow.com/questions/62296638/how-to-update-the-hand-draw-polygon-position-after-moving-it

Thank you

[asturur]

http://fabricjs.com/custom-controls-polygon

Look for how the exact same functionality is obtained here. Version 4 used in your fiddle has been created exactly to solve those problems