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Cappuccino, Spoutcore, or Homegrown for a web drawing application?

I am currently looking at creating an application for drawing entity relationships (data models).

Looking at Sproutcore and Cappuccino, they both look wise enough to handle such things (see 280 slides for an example of a cappuccino) ...

Ideally, I need an infrastructure that allows users to drag and drop components and then bind them together, and then when the user is ready to “freeze” these objects, since JSON is ready to be stored in some kind of database so that they can load again .. .

Which of the mentioned frameworks is more focused on it?

Or is it easiest to spread in places where it is lacking?

Or would it be easier to end up making my own jQuery / prototype?

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280Slides is a great example of the real world of what you can do, how to draw, these shapes are obviously predefined, but you can draw whatever you want using our first graphics library (CoreGraphics). This means that you also get most of the features that you get in Canvas, but they also work in IE.

Atlas also links components.

GoMockingbird is also a good example of applications in which you can easily lay out components.

A simple demo of the plan (with a tutorial) http://cappuccino.org/learn/demos/FloorPlan/index-deploy.html also gives you a good idea of ​​the cool things you can do with first class support.

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Sproutcore: http://demo.sproutcore.com/family_tree/ - , .

, ; Sproutcore.

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