Add mesh.interpolate_line(mesh, xi, axis)

[adtzlr]

This enables an interpolation of a line mesh in N-D space, hopefully useful for further progress on #810.

import felupe as fem
import numpy as np

# create a line mesh
mesh = fem.mesh.Line(n=5).expand(n=1)
t = mesh.x.copy()
mesh.points[:, 0] = np.sin(np.pi / 2 * t)
mesh.points[:, 1] = np.cos(np.pi / 2 * t)

xi = np.linspace(0, 1, 101)
mesh_new = interpolate_line(mesh, xi=xi, axis=1)
derivative = mesh_new.points_derivative(xi)

ax = mesh_new.imshow(style="points", color="black")

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.46%. Comparing base (3c042de) to head (55cb643).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #811   +/-   ##
=======================================
  Coverage   97.45%   97.46%           
=======================================
  Files         138      139    +1     
  Lines        5510     5528   +18     
=======================================
+ Hits         5370     5388   +18     
  Misses        140      140           

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