readme update

README.md

@@ -1,9 +1,27 @@
 # Cubehelix for Max
-By Théophile Clet - 2021-05-13
+By Théophile Clet - september, 2023. First version from 2021.
 https://tflcl.xyz
 
-Original work and js code by Dave Green
-http://www.mrao.cam.ac.uk/~dag/CUBEHELIX
+![jit.cubehelix.ui](img/jit.cubehelix.ui.png)
+## What is this
+This is an implementation of cubehelix color palette generator algorithm for Cycling74```s Max.
+It consists of a few files:
+- ```cubehelix.genjit``` which is the "low-level" code for cubehlix calculation in the jit world
+- ```jit.cubehelix.maxpat```, an abstraction wrapping ```cubehelix.genjit``` as a patcher with some added features for convenience: initialization with attributes, accepts inputs for both ranges (like the D3 implementation) and legacy parameters (start, rotation), converts output matrix...
+- ```jit.cubehelix.maxhelp```, the help file for the \[jit.cubehelix\] abstraction, with examples and explanations
+- ```jit.cubehelix.ui.maxpat```, which is basically a wrapper for \[jit.cubehelix\] with an user interface (can be used as a \[bpatcher\]), randomization capabilities and preset handling (using the pattr system).
+- ```knob-range.js```, a custom \[jsui\] knob made for \[jit.cubehelix.ui\] but which can be repurposed for other things. It allows to set a custom output range, randomize the value in an inner range that can be modified with ctrl+drag (change offset) and option/alt+drag (change width). Holding shift allows fine tuning.
+- ```cubehelixui-default```, some default presets for \[jit.cubehelix.ui\].
 
-Green, D. A., 2011, `A colour scheme for the display of astronomical intensity images', Bulletin of the Astronomical Society of India, 39, 289.
-http://astron-soc.in/bulletin/11June/289392011.pdf
+## How to use
+1. Clone this repo
+2. Put the folder in your Max search paths
+3. Start patching. \[jit.cubehelix\] and its helper file are a good starting point.
+
+## Credits
+Heavily based on [@mbostock cubehelix implementation in D3.js](https://github.com/d3/d3-plugins/tree/master/cubehelix).
+
+Original cubehelix by Dave Green: [Green, D. A., 2011, "A colour scheme for the display of astronomical intensity images", *Bulletin of the Astronomical Society of India*, 39, 289.](http://astron-soc.in/bulletin/11June/289392011.pdf)
+
+![jit.cubehelix helper file example 1](img/jit.cubehelix.maxhelp.1.png)
+![jit.cubehelix helper file example 2](img/jit.cubehelix.maxhelp.2.png)