Describe the feature

The magnetic fields of solar active regions are typically extrapolated in a local Cartesian coordinate system (see ISEE NLFFF database or RobertJaro/NF2). However, sunkit-pyvista currently only supports plotting global solar coronal magnetic field lines in spherical coordinates. It would be nice to add support for visualizing active region magnetic fields in a local Cartesian box.

Proposed solution

A potential solution is to introduce CartesianPlotter for 3D magnetic field arrays with the shape (nx, ny, nz, 3). Field line tracing can be performed using streamtracer.