Parametric Urbanism - Circles from grid system

Hello :)

I am new to grasshopper and is building a city, but am having a problem. 

I have created a building generator which i applied a grid to, that counts how many points(building) there is in each grid-window. Then a colour gradient is applied to show where the windows with the fewest buildings are placed. The white: fewest. Black: the most.  

The challenge is now to make circles in each of these windows where the colour is white and i also want the circles radius to be the distance between two points in that "grid-window" so that there isn't two identically circles. 

The idea is to make a dynamic system, so when changing the amount of buildings the density in the city changes and the urban spaces rearrange in order to those places with fewest buildings. 

I really hope you can help me, since i feel like i tried it all by now! 

I cant attach the grasshopper file, because then my post won't be updated ? 

So for now i only have a picture and is trying to upload the file!