Colour atractors and multiple repulsors

Hi, i´m making a definition that try to give a colour to boxes acording to the distance of some points, and in other hand the boxes are repelled by the position of another point (points). 

My problem is that i need to make more than one repulsor (puntual repulsors, maybe lines soon) of diferent intensity if its possible and i´m only capable to put 1
The other thing I want to make is that the atractor points of the colour can have diferent "area of effect" acording to another parameter and have a bigger or smaller circle of influence and i dont know how to make that diference.

I'd really appreciate your help.