The interior of the boxes is drawn according to the current fillstyle. See set style fill (p. ) for details. Alternatively a new fillstyle may be specified in the plot command.
For fillstyle empty the box is filled with the background color.
For fillstyle solid the box is filled with a solid rectangle of the current drawing color. There is an optional parameter 5#5density6#6 that controls the fill density; it runs from 0 (background color) to 1 (current drawing color).
For fillstyle pattern the box is filled in the current drawing color with a pattern, if supported by the terminal driver.
Examples:
To plot a data file with solid filled boxes with a small vertical space separating them (bargraph):
set boxwidth 0.9 relative set style fill solid 1.0 plot 'file.dat' with boxes
To plot a sine and a cosine curve in pattern-filled boxes style:
set style fill pattern plot sin(x) with boxes, cos(x) with boxes
The sin plot will use pattern 0; the cos plot will use pattern 1. Any additional plots would cycle through the patterns supported by the terminal driver.
To specify explicit fillstyles for each dataset:
plot 'file1' with boxes fs solid 0.25, \ 'file2' with boxes fs solid 0.50, \ 'file3' with boxes fs solid 0.75, \ 'file4' with boxes fill pattern 1, \ 'file5' with boxes fill empty
Currently only the following terminal drivers support fillstyles other than empty: x11, windows, pm, wxt, postscript, fig, pbm, png, gif, hpdj, hppj, hpljii, hp500c, jpeg, nec_cp6, epson_180dpi, epson_60dpi, epson_lx800, okidata, starc and tandy_60dpi. The BeOS driver (be) is untested.