Source code for pygmt.src.colorbar

"""
colorbar - Plot a colorbar.
"""

from pygmt.clib import Session
from pygmt.helpers import build_arg_string, fmt_docstring, kwargs_to_strings, use_alias


@fmt_docstring
@use_alias(
    R="region",
    J="projection",
    B="frame",
    C="cmap",
    D="position",
    F="box",
    G="truncate",
    I="shading",
    W="scale",
    V="verbose",
    X="xshift",
    Y="yshift",
    c="panel",
    p="perspective",
    t="transparency",
)
@kwargs_to_strings(
    R="sequence", G="sequence", I="sequence", c="sequence_comma", p="sequence"
)
def colorbar(self, **kwargs):
    r"""
    Plot a gray or color scale-bar on maps.

    Both horizontal and vertical scales are supported. For CPTs with
    gradational colors (i.e., the lower and upper boundary of an interval
    have different colors) we will interpolate to give a continuous scale.
    Variations in intensity due to shading/illumination may be displayed by
    setting the ``shading`` parameter. Colors may be spaced according to a
    linear scale, all be equal size, or by providing a file with individual
    tile widths.

    Full option list at :gmt-docs:`colorbar.html`

    {aliases}

    Parameters
    ----------
    frame : str or list
        Set color bar boundary frame, labels, and axes attributes.
    {CPT}
    position : str
        [**g**\|\ **j**\|\ **J**\|\ **n**\|\ **x**]\ *refpoint*\
        [**+w**\ *length*\ [/\ *width*]]\ [**+e**\ [**b**\|\ **f**][*length*]]\
        [**+h**\|\ **v**][**+j**\ *justify*]\
        [**+m**\ [**a**\|\ **c**\|\ **l**\|\ **u**]]\
        [**+n**\ [*txt*]][**+o**\ *dx*\ [/*dy*]].
        Defines the reference point on the map for the color scale using one of
        four coordinate systems: (1) Use **g** for map (user) coordinates, (2)
        use **j** or **J** for setting *refpoint* via a 2-char justification
        code that refers to the (invisible) map domain rectangle, (3) use **n**
        for normalized (0-1) coordinates, or (4) use **x** for plot
        coordinates (inches, cm, etc.). All but **x** requires both ``region``
        and ``projection`` to be specified. Append **+w** followed by the
        length and width of the color bar. If width is not specified then it is
        set to 4% of the given length. Give a negative length to reverse
        the scale bar. Append **+h** to get a horizontal scale
        [Default is vertical (**+v**)]. By default, the anchor point on the
        scale is assumed to be the bottom left corner (**BL**), but this can be
        changed by appending **+j** followed by a 2-char justification code
        *justify*.
    box : bool or str
        [**+c**\ *clearances*][**+g**\ *fill*][**+i**\ [[*gap*/]\ *pen*]]\
        [**+p**\ [*pen*]][**+r**\ [*radius*]][**+s**\ [[*dx*/*dy*/][*shade*]]].
        If set to ``True``, draws a rectangular border around the color scale.
        Alternatively, specify a different pen with **+p**\ *pen*. Add
        **+g**\ *fill* to fill the scale panel [default is no fill]. Append
        **+c**\ *clearance* where *clearance* is either gap, xgap/ygap, or
        lgap/rgap/bgap/tgap where these items are uniform, separate in x- and
        y-direction, or individual side spacings between scale and border.
        Append **+i** to draw a secondary, inner border as well. We use a
        uniform gap between borders of 2p and the :gmt-term:`MAP_DEFAULTS_PEN`
        unless other values are specified. Append **+r** to draw rounded
        rectangular borders instead, with a 6p corner radius. You can override
        this radius by appending another value. Finally, append **+s** to draw
        an offset background shaded region. Here, *dx/dy* indicates the shift
        relative to the foreground frame [4p/-4p] and shade sets the fill
        style to use for shading [default is gray50].
    truncate : list or str
        *zlo*/*zhi*.
        Truncate the incoming CPT so that the lowest and highest z-levels are
        to *zlo* and *zhi*. If one of these equal NaN then we leave that end of
        the CPT alone. The truncation takes place before the plotting.
    scale : float
        Multiply all z-values in the CPT by the provided scale. By default
        the CPT is used as is.
    shading : str or list or bool
        Add illumination effects. Passing a single numerical value sets the
        range of intensities from -value to +value. If not specified, 1 is
        used. Alternatively, set ``shading=[low, high]`` to specify an
        asymmetric intensity range from *low* to *high*. [Default is no
        illumination].
    {V}
    {XY}
    {c}
    {p}
    {t}
    """
    kwargs = self._preprocess(**kwargs)  # pylint: disable=protected-access
    with Session() as lib:
        lib.call_module("colorbar", build_arg_string(kwargs))
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