Envelope editor with synced, fixed and frozen points

[Nogbit]

I have a backlog of items I would like to add to the Envelope editor. I can create separate issues for each of these if you like, but with so many the bigger question is how they impact the options.points array etc. These features are coming from this screenshot of my ADSR editor I've built.

• Fixed Points (a defined list of points that can't be moved by the user)
  • make the svg circle at these points hallow?
  • the options points array now now looks like { x, y, fixed} with fixed being a bool?
• Disable adding of points (restrict the user from adding any more points)
  • the options now has frozen and all add/move methods return or do what?
  • can be frozen at a later point in time
• Synced Points (if I move index 3 for example I want one or more other points.Y to move with the same value)
  • each point in the options points obj now has another property, a synced array?
  • implementation should be simple...the syncing is on the Y axis only (X sync seems weird to me)

I can work on this and would like to do it before #101

[Nogbit]

Actually, syncing on X I can see being relevant as well in some use cases. So the points obj could look like the following once the features in my description above are implemented. I went with frozen here as that seems intuitive when also having the ability to freeze the add/remove of points.

points [
  {
    x: 1,
    y: 2,
    frozen: false,
    synced: [
      {
        index: 3
        x: true
        y: false
      }, {
        ... another point to sync this point with... 
      }
    ]
  }
]

[mscottnelson]

@Nogbit, do you have any outstanding MRs you'd like to make related to these features? If so, they would be welcome!

[Nogbit]

thanks for asking, I moved on to a different project so I no longer need this

[starfishmod]

I am trying to do something similar. As an extension to this I would like to be able to set the x/y min/max values to constrain the points in a certain area - which could work having fixed points?