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Accepts a vector of numbers and draws a Venn diagram
This draws a correctly proportioned chart for the two circles and overlap. You may also pass an array of 7 numbers, giving the values for 3 circles and the 4 overlap possibilities. In this case a simple cloverleaf diagram is drawn, as it is not possible to draw the diagram with simple shapes and have all the areas proportioned correctly.
Use the XLabels to caption each of the 3 regions, or Value tags if you prefer to have the legend written inside each region. Alternatively, you may use the Legend to key each circle (2 or 3 legend entries depending on the number of circles).