Visualizing Proportions - Data Points: Visualization That Means Something - page 143

FIGurE 5-9 From pie to donut chart
Although you're about to get into a different programming language, you
still follow the same process like you did in R and Illustrator. First, load
the data, then build the base, and finally, customize the aesthetics.
Figure 5-10 shows what you want to make. It's similar to Figure 5-9, except
the labels are set at an angle, and when you mouse over an arc, you can
see how many votes there were for the corresponding category. Interac-
tion can get much more advanced, but you have to learn the basics before
you get fancy.