(BAR-3D upper-left-point lower-right-point depth top?)
Draws a solid 3-dimensional bar with outlets, using the current fill
pattern and fill color for the front face, and current line width and
color for outlet. Depth is the 3rd dimension, given in the
X-dimension coordinate system. Top? is #T
if a top
should be drawn, and #F
if not. #T
and #F
can be replaced by 1 and 0). This function is very useful for
drawing bar charts.