Draw graphics using invisible ink?
If the Invisible value of a Plot is non-zero, then all the Plot methods which normally generate
graphical output do not do so (you can think of them drawing with "
invisible ink"
). Such methods
do, however, continue to do all the calculations which would be needed to produce the graphics. In
particular, the bounding box enclosing the graphics is still calculated and can be retrieved as normal
using AST_BOUNDINGBOX. The default value is zero, resulting in all methods drawing graphics as
normal, using visible ink.