Dynamic Colours using x and y coordinates of points in a list
Maybe I'm trying to do this the hard way, but I want to create a coloured partition of the plane (Voronoi Diagram) that automatically re-adjusts as the user drags the individual site points around. Since I can't seem to dynamically define the graphics view background colour based on x and y coordinates, I've instead created a list of 10,000 points in a 1 x 1 square. I intend to dynamically control the colour of each point by changing their RGB values based on their distances from each of the sites in the diagram. To do this, I will need to reference the x and y coordinates of each point. If my list is named 'list' I've tried referencing the coordinates as x(list) and y(list) and it doesn't seem to work.
As a test, I wanted to see if I could make the right half of the square turn red. So I selected all the points in the spreadsheet, right clicked to change all their properties at once, went to dynamic colours, and entered if(x(list) > 0.5, 255) in the Red field, and zeroes in both Green and Blue. Nothing happened.
Am I going about this wrong?
The same question 
If you create point A1 in the spreadsheet and set the Red dynamic colour to eg
then if you copy and paste A1 to A2 then that condition will update, for example to
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