Filledcurves

The filledcurves style is only used for 2D plotting. It has three variants. The first two variants require either a single function or two columns (x,y) of input data, and may be further modified by the options listed below.

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 fills the area between two curves sampled at the same set of x coordinates. It requires three columns of input data (x, y1, y2). This is the default if there are three or more columns of input data. If you have a y value in column 2 and an associated error value in column 3 the area of uncertainty can be represented by shading. See also the similar 3D plot style zerrorfill.

3 columns:  x  y  yerror

plot $DAT using 1:($2-$3):($2+$3) with filledcurves, \
     $DAT using 1:2 smooth mcs with lines

The above and below options apply both to commands of the form

... filledcurves above {x1|x2|y|r}=<val>

and to commands of the form

... using 1:2:3 with filledcurves below

In either case the option limits the filled area to one side of the bounding line or curve.

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 <x>, <y>, or <a> are outside the drawing boundary they are moved to the graph boundary. Then the actual fill area in the case of option xy=<x>,<y> will depend on xrange and yrange.

Fill properties

Plotting with filledcurves can be further customized by giving a fillstyle (solid/transparent/pattern) or a fillcolor. If no fillstyle ( fs) is given in the plot command then the current default fill style is used. See set style fill. If no fillcolor ( fc) is given in the plot command, the usual linetype color sequence is followed.

The {{no}border} property of the fillstyle is honored by filledcurves mode closed, the default. It is ignored by all other filledcurves modes. Example:

plot 'data' with filledcurves fc "cyan" fs solid 0.5 border lc "blue"