Specifies the compound array for this Pen object, which specifies the parallel lines for pen with values between 0 and 1. The CompoundArray property must be monotonically increasing (between 0 and 1) with an even number of elements in the array.
Suppose a compound array contains the values 0.0, 0.2, 0.7, and 1.0 and that the pen has a width of 100. When you use the pen to draw, you get two parallel lines. The first line has a width of 20, the space between the two lines has a width of 50, and the second line has a width of 30.