Fill the area between two vertical curves.

The curves are defined by the points (y, x1) and (y, x2). This creates one or multiple polygons describing the filled area.

You may exclude some vertical sections from filling using where.

By default, the edges connect the given points directly. Use step if the filling should be a step function, i.e. constant in between y.

Parameters¶

yarray (length N)

The y coordinates of the nodes defining the curves.

x1array (length N) or scalar

The x coordinates of the nodes defining the first curve.

x2array (length N) or scalar, default: 0

The x coordinates of the nodes defining the second curve.

wherearray of bool (length N), optional

Define where to exclude some vertical regions from being filled. The filled regions are defined by the coordinates y[where]. More precisely, fill between y[i] and y[i+1] if where[i] and where[i+1]. Note that this definition implies that an isolated True value between two False values in where will not result in filling. Both sides of the True position remain unfilled due to the adjacent False values.

interpolatebool, default: False

This option is only relevant if where is used and the two curves are crossing each other.

Semantically, where is often used for x1 > x2 or similar. By default, the nodes of the polygon defining the filled region will only be placed at the positions in the y array. Such a polygon cannot describe the above semantics close to the intersection. The y-sections containing the intersection are simply clipped.

Setting interpolate to True will calculate the actual intersection point and extend the filled region up to this point.

step{‘pre’, ‘post’, ‘mid’}, optional

Define step if the filling should be a step function, i.e. constant in between y. The value determines where the step will occur:

• ‘pre’: The y value is continued constantly to the left from every x position, i.e. the interval (x[i-1], x[i]] has the value y[i].

• ‘post’: The y value is continued constantly to the right from every x position, i.e. the interval [x[i], x[i+1]) has the value y[i].

• ‘mid’: Steps occur half-way between the x positions.

Returns¶

.PolyCollection

A .PolyCollection containing the plotted polygons.

Other Parameters¶

dataindexable object, optional

If given, the following parameters also accept a string s, which is interpreted as data[s] (unless this raises an exception):

y, x1, x2, where

**kwargs

All other keyword arguments are passed on to .PolyCollection. They control the .Polygon properties:

Properties: agg_filter: a filter function, which takes a (m, n, 3) float array and a dpi value, and returns a (m, n, 3) array and two offsets from the bottom left corner of the image alpha: array-like or scalar or None animated: bool antialiased or aa or antialiaseds: bool or list of bools array: array-like or None capstyle: .CapStyle or {‘butt’, ‘projecting’, ‘round’} clim: (vmin: float, vmax: float) clip_box: ~matplotlib.transforms.BboxBase or None clip_on: bool clip_path: Patch or (Path, Transform) or None cmap: .Colormap or str or None color: :mpltype:`color` or list of RGBA tuples edgecolor or ec or edgecolors: :mpltype:`color` or list of :mpltype:`color` or ‘face’ facecolor or facecolors or fc: :mpltype:`color` or list of :mpltype:`color` figure: ~matplotlib.figure.Figure gid: str hatch: {‘/’, ‘\’, ‘|’, ‘-’, ‘+’, ‘x’, ‘o’, ‘O’, ‘.’, ‘*’} in_layout: bool joinstyle: .JoinStyle or {‘miter’, ‘round’, ‘bevel’} label: object linestyle or dashes or linestyles or ls: str or tuple or list thereof linewidth or linewidths or lw: float or list of floats mouseover: bool norm: .Normalize or str or None offset_transform or transOffset: .Transform offsets: (N, 2) or (2,) array-like path_effects: list of .AbstractPathEffect paths: list of array-like picker: None or bool or float or callable pickradius: float rasterized: bool sizes: numpy.ndarray or None sketch_params: (scale: float, length: float, randomness: float) snap: bool or None transform: ~matplotlib.transforms.Transform url: str urls: list of str or None verts: list of array-like verts_and_codes: unknown visible: bool zorder: float

See Also¶

fill_between : Fill between two sets of y-values. fill_betweenx : Fill between two sets of x-values.