matplotlib.colors.BivarColormap

classmatplotlib.colors.BivarColormap(N=256, M=256, shape='square', origin=(0, 0), name='bivariate colormap')[source]

Bases: object

Base class for all bivariate to RGBA mappings.

Designed as a drop-in replacement for Colormap when using a 2D lookup table. To be used with ScalarMappable.

Parameters:

Nint, default: 256

The number of RGB quantization levels along the first axis.

Mint, default: 256

The number of RGB quantization levels along the second axis.

shape{'square', 'circle', 'ignore', 'circleignore'}

• 'square' each variate is clipped to [0,1] independently
• 'circle' the variates are clipped radially to the center of the colormap, and a circular mask is applied when the colormap is displayed
• 'ignore' the variates are not clipped, but instead assigned the 'outside' color
• 'circleignore' a circular mask is applied, but the data is not clipped and instead assigned the 'outside' color

origin(float, float), default: (0,0)

The relative origin of the colormap. Typically (0, 0), for colormaps that are linear on both axis, and (.5, .5) for circular colormaps. Used when getting 1D colormaps from 2D colormaps.

namestr, optional

The name of the colormap.

__call__(X, alpha=None, bytes=False)[source]

Parameters:

Xtuple (X0, X1), X0 and X1: float or int or array-like

The data value(s) to convert to RGBA.

• For floats, X should be in the interval [0.0, 1.0] to return the RGBA values X*100 percent along the Colormap.
• For integers, X should be in the interval [0, Colormap.N) to return RGBA values indexed from the Colormap with index X.

alphafloat or array-like or None, default: None

Alpha must be a scalar between 0 and 1, a sequence of such floats with shape matching X0, or None.

bytesbool, default: False

If False (default), the returned RGBA values will be floats in the interval [0, 1] otherwise they will be numpy.uint8s in the interval [0, 255].

Returns:

Tuple of RGBA values if X is scalar, otherwise an array of

RGBA values with a shape of X.shape + (4, ).

copy()[source]

Return a copy of the colormap.

get_bad()[source]

Get the color for masked values.

get_outside()[source]

Get the color for out-of-range values.

propertylut

For external access to the lut, i.e. for displaying the cmap. For circular colormaps this returns a lut with a circular mask.

Internal functions (such as to_rgb()) should use _lut which stores the lut without a circular mask A lut without the circular mask is needed in to_rgb() because the conversion from floats to ints results in some some pixel-requests just outside of the circular mask

propertyorigin

resampled(lutshape, transposed=False)[source]

Return a new colormap with lutshape entries.

Note that this function does not move the origin.

Parameters:

lutshapetuple of ints or None

The tuple must be of length 2, and each entry is either an int or None.

• If an int, the corresponding axis is resampled.
• If negative the corresponding axis is resampled in reverse
• If -1, the axis is inverted
• If 1 or None, the corresponding axis is not resampled.

transposedbool, default: False

if True, the axes are swapped after resampling

Returns:

BivarColormap

reversed(axis_0=True, axis_1=True)[source]

Reverses both or one of the axis.

propertyshape

transposed()[source]

Transposes the colormap by swapping the order of the axis

with_extremes(*, bad=None, outside=None, shape=None, origin=None)[source]

Return a copy of the BivarColormap with modified attributes.

Note that the outside color is only relevant if shape = 'ignore' or 'circleignore'.

Parameters:

badNone or color

If Matplotlib color, the bad value is set accordingly in the copy

outsideNone or color

If Matplotlib color and shape is 'ignore' or 'circleignore', values outside the colormap are colored accordingly in the copy

shape{'square', 'circle', 'ignore', 'circleignore'}

• If 'square' each variate is clipped to [0,1] independently
• If 'circle' the variates are clipped radially to the center of the colormap, and a circular mask is applied when the colormap is displayed
• If 'ignore' the variates are not clipped, but instead assigned the outside color
• If 'circleignore' a circular mask is applied, but the data is not clipped and instead assigned the outside color

origin(float, float)

The relative origin of the colormap. Typically (0, 0), for colormaps that are linear on both axis, and (.5, .5) for circular colormaps. Used when getting 1D colormaps from 2D colormaps.

Returns:

BivarColormap

copy of self with attributes set