Bez.js for Illustrator

Bez.js is a library of path-related functions for Adobe Illustrator.

So far I have used it in my Dasher project script as well as example scripts Add Path Point At Extrema.js and Interpolate Between Paths.js.

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Installation

Download the latest release. Store the scripts where you normally store your Illustrator script. Make sure Bez.js is in the same folder as Add Path Point At Extrema.js so it can find it.

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Example Usage

Add Path Point At Extrema

Make a selection in Illustrator and run Add Path Point At Extrema.js script. You can select just the path segments that you wish to add the anchor points to, or you can select the whole path, or paths.

Remember: it won't work unless Bez.js are in the same folder with the script, or if you change the path at the start of the script.

Interpolate Between Paths

Select two compatible path items in Illustrator and run Interpolate Between Paths.js script. Edit the script to use in one of two ways:

Example 1: make 6 interpolated paths

var items = Bez.pathItemsFromInterpolation(doc.selection[0], doc.selection[1], 6);

Example 2: make a single new path at 20% position (ie. t == 0.2)

var items = Bez.pathItemsFromInterpolation(doc.selection[0], doc.selection[1], undefined, 0.2);

Note: path items have the same number of path points.

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Why this project?

Someone the adobe community forum asked for a script that added an anchor point at the top extrema of a path. I had recently created Bez.js for another project. It already had some of the logic required for this and so I decided to extend it.

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Please help with testing

As of 2022-03-14, this script is hardly tested at all, and only on my machine. Adobe Illlustrator 2022 (v26), MacOS 12.2.1.

Please post any issues you come across.

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System requirements

As of 2022-01-24, tested only on AI version 26.1 (MacOS 12.1).

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Acknowledgements

Thanks so much to Hiroyuki Sato, for his bezier maths code from his excellent Divide (length).js script.

To calculate extrema, I use code from Timo's answer on stackexchange. Thanks Timo.