Also Godek, I would keep in mind that if anyone were actually to use such a spreadsheet/diagram, the use would be a constantly moving target. A ranking would change from day to day or moment to moment.
So if you were thinking of how to commit such a project to software, be sure to keep each activity on a single line, and hopefully incorporate some way to sort the lines "continuously."
In other words make it easy to use the software to both sort and drag and drop to rearrange the lines. Because if you were trying to list all your daily activities on the chart in order to help choose from among them, (which is sort of a presumption of what we are doing? ) and keep them sorted to maximize pleasure, the sorting is going to change almost moment by moment.
But just that kind of sorting is pretty much exactly what I think Epicurus was talking about doing - constantly.