"""
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):
"""
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 option -I. 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[+wlength[/width]][+e[b|f][length]][+h|v]
[+jjustify][+m[a|c|l|u]][+n[txt]][+odx[/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
``[+cclearances][+gfill][+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 +ppen. Add +gfill to fill the scale panel [no fill].
Append +cclearance 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 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 [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*. The 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))