Use the sliders to enter the percentages of first-place and second-place votes in a three-candidate election. The gray area is the approval hull, which shows the set of all possible approval voting results based on your input. Inside the gray area is the "procedure line," which shows results using different positional voting systems: from the plurality result (green) to the anti-plurality result (red). The black point is the Borda count result. Using a particular system, the victor of an election is the candidate for whom the point is closest to the vertex A, B or C.