Figure.fill_between: Support for non-coregistered curves

[seisman]

Now support two curves with different x-coodinates.

Related to #4678 and #4679

Preview: https://pygmt-dev--4692.org.readthedocs.build/en/4692/api/generated/pygmt.Figure.fill_between.html

Examples

import pygmt
import numpy as np

x = np.linspace(0, 4, 100)
y = np.sin(5 * x)
x3 = np.array([0, 0.21, 0.4, 0.63, 0.89, 1.18, 1.45, 1.69, 1.96, 2.26, 2.61, 3.23, 3.49, 4.0])
y3 = 0.5 * np.cos(3 * x3)

fig = pygmt.Figure()
fig.basemap(region=[0, 4, -1.2, 1.2], projection="X10c/5c", frame=True)
fig.fill_between(
    x=x,
    y=y,
    x2=x3,
    y2=y3,
    fill="lightgreen",
    fill2="lightbrown",
    pen="1p,green",
    pen2="1p,brown",
    label="y=sin(5x)",
    label2="y=0.5*cos(3x)",
)
fig.plot(x=x, y=y, style="c0.06c", fill="green", pen="green")
fig.plot(x=x3, y=y3, style="c0.06c", fill="brown", pen="brown")
fig.legend()
fig.show()

[github-actions]

Summary of changed images

This is an auto-generated report of images that have changed on the DVC remote

Status	Path
added	pygmt/tests/baseline/test_fill_between_noncoregistered.png
modified	pygmt/tests/baseline/test_fill_between_coregistered.png
modified	pygmt/tests/baseline/test_fill_between_y2_scalar.png

Image diff(s)

Details

Added images

• test_fill_between_noncoregistered.png

Modified images

Path	Old	New
test_fill_between_coregistered.png
test_fill_between_y2_scalar.png

Report last updated at commit 7e8cff3

[yvonnefroehlich]

Looks good to me.

I think it's nice to extend the related gallery example https://www.pygmt.org/dev/gallery/lines/fill_areas_between_curves.html using the usage of non-co-registrated curves (in a separate PR).