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The detailed documentation of the constructor adds no information, and even so it has typos. I suspect that there is useful information missing from paintChildren() as well. Is it this method which paints the children with varying intensity?
This bug applies to nearly all of the Visual Library that I have looked at so far. Detailed documentation on a method typically has one sentence, which restates what one can figure out from the method name and the argument names. The javadoc for this library is very, very lacking. Plus the English is poor in many, many places. Thes pages need work and they need thorough editing by a native English-speaking tech writer.