[PD] [gem] interacting with objects

Hello, I'm testing with a patch for move objects in the gem render screen, using mouse. In adjunt you have a simple example

I'd like:

• Each object have a control surface, for example, a rectangle or square. If

mouse is over active surface, we can do the interaction.

• to have a index for each object. When I click on some control's square, I

have the index of object active. That is more complex if we work in 3D or exist overlaping in several objects

Right now, I have this troubles (with adjunt's patch):

• Object clicked jump for to have center in mouse position.
• If we move fast the mouse, we lose the object
• I need a general work with position of mouse, not only relative to a size

of screen

are there some general patch for work with interactions?

Thanks