Syntax:
plot ... with filledcurves [option]
where the option can be one of the following
[closed | {above | below} {x1 | x2 | y | r}[=<a>] | xy=<x>,<y>]
The first variant, closed, treats the curve itself as a closed polygon. This is the default if there are two columns of input data.
The second variant is to fill the area between the curve and a given axis, a horizontal or vertical line, or a point.
filledcurves closed ... just filled closed curve, filledcurves x1 ... x1 axis, filledcurves x2 ... x2 axis, etc for y1 and y2 axes, filledcurves y=42 ... line at y=42, i.e. parallel to x axis, filledcurves xy=10,20 ... point 10,20 of x1,y1 axes (arc-like shape). filledcurves above r=1.5 the area of a polar plot outside radius 1.5
The third variant requires three columns of input data: the x coordinate and two y coordinates corresponding to two curves sampled at the same set of x coordinates; the area between the two curves is filled. This is the default if there are three or more columns of input data.
3 columns: x y1 y2
Example of filling the area between two input curves.
plot 'data' using 1:2:3 with filledcurves
The above and below options apply both to commands of the form
... filledcurves above {x1|x2|y|r}=<val>
... using 1:2:3 with filledcurves below
Notes: Not all terminal types support this plotting mode.
The x= and y= keywords are ignored for 3 columns data plots
Zooming a filled curve drawn from a datafile may produce empty or incorrect areas because gnuplot is clipping points and lines, and not areas.
If the values of a
,
x
,
y
are out of the drawing boundary, then they
are moved to the graph boundary. Then the actually filled area in the case
of option xy=
x
,
y
will depend on xrange and yrange.