"""
plot - Plot in two dimensions.
"""
import numpy as np
from pygmt.clib import Session
from pygmt.exceptions import GMTInvalidInput
from pygmt.helpers import (
build_arg_string,
data_kind,
dummy_context,
fmt_docstring,
is_nonstr_iter,
kwargs_to_strings,
use_alias,
)
@fmt_docstring
@use_alias(
A="straight_line",
B="frame",
C="cmap",
D="offset",
E="error_bar",
F="connection",
G="color",
I="intensity",
J="projection",
L="close",
N="no_clip",
R="region",
S="style",
U="timestamp",
V="verbose",
W="pen",
X="xshift",
Y="yshift",
Z="zvalue",
i="columns",
l="label",
c="panel",
p="perspective",
t="transparency",
)
@kwargs_to_strings(R="sequence", c="sequence_comma", i="sequence_comma", p="sequence")
def plot(self, x=None, y=None, data=None, sizes=None, direction=None, **kwargs):
"""
Plot lines, polygons, and symbols in 2-D.
Takes a matrix, (x,y) pairs, or a file name as input and plots lines,
polygons, or symbols at those locations on a map.
Must provide either *data* or *x* and *y*.
If providing data through *x* and *y*, *color* can be a 1d array that
will be mapped to a colormap.
If a symbol is selected and no symbol size given, then plot will
interpret the third column of the input data as symbol size. Symbols
whose size is <= 0 are skipped. If no symbols are specified then the
symbol code (see *style* below) must be present as last column in the
input. If *style* is not used, a line connecting the data points will
be drawn instead. To explicitly close polygons, use *close*. Select a
fill with *color*. If *color* is set, *pen* will control whether the
polygon outline is drawn or not. If a symbol is selected, *color* and
*pen* determines the fill and outline/no outline, respectively.
Full option list at :gmt-docs:`plot.html`
{aliases}
Parameters
----------
x/y : float or 1d arrays
The x and y coordinates, or arrays of x and y coordinates of the
data points
data : str or 2d array
Either a data file name or a 2d numpy array with the tabular data.
Use option *columns* (i) to choose which columns are x, y, color,
and size, respectively.
sizes : 1d array
The sizes of the data points in units specified in *style* (S).
Only valid if using *x* and *y*.
direction : list of two 1d arrays
If plotting vectors (using ``style='V'`` or ``style='v'``), then
should be a list of two 1d arrays with the vector directions. These
can be angle and length, azimuth and length, or x and y components,
depending on the style options chosen.
{J}
{R}
straight_line : bool or str
``[m|p|x|y]``.
By default, geographic line segments are drawn as great circle
arcs. To draw them as straight lines, use *straight_line*.
Alternatively, add **m** to draw the line by first following a
meridian, then a parallel. Or append **p** to start following a
parallel, then a meridian. (This can be practical to draw a line
along parallels, for example). For Cartesian data, points are
simply connected, unless you append **x** or **y** to draw
stair-case curves that whose first move is along *x* or *y*,
respectively.
{B}
{CPT}
offset : str
``dx/dy``.
Offset the plot symbol or line locations by the given amounts
*dx/dy* [Default is no offset]. If *dy* is not given it is set
equal to *dx*.
error_bar : bool or str
``[x|y|X|Y][+a][+cl|f][+n][+wcap][+ppen]``.
Draw symmetrical error bars. Full documentation is at
:gmt-docs:`plot.html#e`.
connection : str
``[c|n|r][a|f|s|r|refpoint]``.
Alter the way points are connected (by specifying a *scheme*) and
data are grouped (by specifying a *method*). Append one of three
line connection schemes:
- **c** : Draw continuous line segments for each group [Default].
- **r** : Draw line segments from a reference point reset for each
group.
- **n** : Draw networks of line segments between all points in
each group.
Optionally, append the one of four segmentation methods to define
the group:
- **a** : Ignore all segment headers, i.e., let all points belong
to a single group, and set group reference point to the very
first point of the first file.
- **f** : Consider all data in each file to be a single separate
group and reset the group reference point to the first point of
each group.
- **s** : Segment headers are honored so each segment is a group;
the group reference point is reset to the first point of each
incoming segment [Default].
- **r** : Same as **s**, but the group reference point is reset
after each record to the previous point (this method is only
available with the ``connection='r'`` scheme).
Instead of the codes **a**|**f**|**s**|**r** you may append the
coordinates of a *refpoint* which will serve as a fixed external
reference point for all groups.
{G}
intensity : float or bool
Provide an *intens* value (nominally in the -1 to +1 range) to
modulate the fill color by simulating illumination [None]. If
using ``intensity=True``, we will instead read *intens* from the
first data column after the symbol parameters (if given).
close : str
``[+b|d|D][+xl|r|x0][+yl|r|y0][+ppen]``.
Force closed polygons. Full documentation is at
:gmt-docs:`plot.html#l`.
no_clip : bool or str
``'[c|r]'``.
Do NOT clip symbols that fall outside map border [Default plots
points whose coordinates are strictly inside the map border only].
The option does not apply to lines and polygons which are always
clipped to the map region. For periodic (360-longitude) maps we
must plot all symbols twice in case they are clipped by the
repeating boundary. ``no_clip=True`` will turn off clipping and not
plot repeating symbols. Use ``no_clip="r"`` to turn off clipping
but retain the plotting of such repeating symbols, or use
``no_clip="c"`` to retain clipping but turn off plotting of
repeating symbols.
style : str
Plot symbols (including vectors, pie slices, fronts, decorated or
quoted lines).
{W}
{U}
{V}
{XY}
zvalue : str
``value|file``.
Instead of specifying a symbol or polygon fill and outline color
via **color** and **pen**, give both a *value* via **zvalue** and a
color lookup table via **cmap**. Alternatively, give the name of a
*file* with one z-value (read from the last column) for each
polygon in the input data. To apply it to the fill color, use
``color='+z'``. To apply it to the pen color, append **+z** to
**pen**.
{c}
columns : str or 1d array
Choose which columns are x, y, color, and size, respectively if
input is provided via *data*. E.g. ``columns = [0, 1]`` or
``columns = '0,1'`` if the *x* values are stored in the first
column and *y* values in the second one. Note: zero-based
indexing is used.
label : str
Add a legend entry for the symbol or line being plotted.
{p}
{t}
*transparency* can also be a 1d array to set varying transparency
for symbols.
"""
kwargs = self._preprocess(**kwargs) # pylint: disable=protected-access
kind = data_kind(data, x, y)
extra_arrays = []
if "S" in kwargs and kwargs["S"][0] in "vV" and direction is not None:
extra_arrays.extend(direction)
if "G" in kwargs and not isinstance(kwargs["G"], str):
if kind != "vectors":
raise GMTInvalidInput(
"Can't use arrays for color if data is matrix or file."
)
extra_arrays.append(kwargs["G"])
del kwargs["G"]
if sizes is not None:
if kind != "vectors":
raise GMTInvalidInput(
"Can't use arrays for sizes if data is matrix or file."
)
extra_arrays.append(sizes)
if "t" in kwargs and is_nonstr_iter(kwargs["t"]):
extra_arrays.append(kwargs["t"])
kwargs["t"] = ""
with Session() as lib:
# Choose how data will be passed in to the module
if kind == "file":
file_context = dummy_context(data)
elif kind == "matrix":
file_context = lib.virtualfile_from_matrix(data)
elif kind == "vectors":
file_context = lib.virtualfile_from_vectors(
np.atleast_1d(x), np.atleast_1d(y), *extra_arrays
)
with file_context as fname:
arg_str = " ".join([fname, build_arg_string(kwargs)])
lib.call_module("plot", arg_str)