ZingChart: How are values calculated on a pareto chart?

The values are calculated fairly easily. All of the values added together equal 100%. Each value is plotted in respect to the previous value. The value for the first x axis index is plotted as its percentage of the sum of all values. The second point is plotted as its percentage of the sum of the entire plot but it is added to the percentage of the first point. The third is added to the first and second. And so on...

Refer to the Pareto Charts Tutorial for more information.