[Gnuplot-info] Colored Rectangles in gnuplot

[Tom B. <tj...@op...>]

Can anyone tell me how to draw and place colored rectangles into a 2-d 
gnuplot.  I have bounding boxes for rectangles (Xlow, Ylow) (Xhigh, Yhigh) and 
a single number that represents a density parameter for the rectangle. I want 
to generate a 2-d plot of the rectangles colored by their density parameter. I 
have tried drawing boxxyerrorbars but can’t seem to fill each rectangle with a 
color proportional to the density function. I need to draw about a thousand 
rectangles per plot. Each rectangle represents a "macro" in a microporcessor 
design and i want to visualize several different views of macro "density" 
functions.