Vectorizer: can not convert zero-length arc to curve

[kumilingus]

Discussed in https://github.com/clientIO/joint/discussions/2464

^{Originally posted by **gordon-brown** January 3, 2024} ### Introduction I'm having an issue rendering one of the clip art shapes I converted. It seems to me to be related to rendering elliptical curves in the path data. I can render the shape on the https://www.svgviewer.dev/ site. Not sure if I am doing something wrong or if this is an issue with your software. [BPMN_StoredData-202401030954.joint.txt](https://github.com/clientIO/joint/files/13820532/BPMN_StoredData-202401030954.joint.txt)   ### Steps to reproduce _No response_ ### Restrictions & Constraints _No response_ ### Does your question relate to JointJS or JointJS+. Select both if applicable. JointJS

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There seems to be an issue with an arc command that has zero length and our code is not able to convert it to the curve command. I am changing the question to a bug.

It works if you define your path like this: 'M 5.555555555555555 0L 50 0A 5.555555555555555,25 0 0,0 50,50 L 50,50L 5.555555555555555 50A 5.555555555555555,25 0 0,1 5.555555555555555,0Z'

From Artur

Visio implications

Also, this is happening when importing joint-format-visio\test\visual\fixtures\Chapter05\Network diagram_start.vsdx. Path

M 0 0 M 32 4 A 3.95 3.95 0 0 1 24.49 3.95 A 3.95 3.95 0 0 1 32.39 3.95 A 3.95 3.95 0 0 1 32.39 3.95

normalized using V.normalizePathData with NaNs as

M 0 0 M 32 4 C 31.03738563658328 6.884319592775694 27.313384109109503 7.644958723402278 25.296797250840925 5.369150434247764 C 24.931981254846672 4.957439297533957 24.65718116651638 4.474067961804264 24.49 3.95 C 24.49 0.9092885822679708 27.781666666666666 -0.9911560538145481 30.415 0.5291996550514662 C 31.637134253196088 1.2347991951200896 32.39 2.5388009198627532 32.39 3.95 C NaN NaN NaN NaN 32.39 3.95

[zbynekstara]

Fixed as part of JointJS v4.0.2 (JointJS+ v4.0.1)