Figure.grdview, Figure.grdimage: Add alias "no_interpolation" for "-T"

[yvonnefroehlich]

Description of proposed changes

This PR addes an alias for -T of Figure.grdview and Figure.grdimage:

• Introduce alias name: no_interpolation
• Write docstring: upstream GMT documentation at https://docs.generic-mapping-tools.org/dev/grdview#t

Preview: https://pygmt-dev--3355.org.readthedocs.build/en/3355/api/generated/pygmt.Figure.grdview.html

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If wrapping a new module, open a 'Wrap new GMT module' issue and submit reasonably-sized PRs.
• If adding new functionality, add an example to docstrings or tutorials.
• Use underscores (not hyphens) in names of Python files and directories.

Slash Commands

You can write slash commands (/command) in the first line of a comment to perform
specific operations. Supported slash command is:

• /format: automatically format and lint the code

[seisman]

Two points:

1. grdimage also has the same -T option, which is not aliased yet
2. Instead of just alias -T to no_interpolate, we may want to more Pythonic parameters.

[yvonnefroehlich]

Two points:

1. grdimage also has the same -T option, which is not aliased yet

Thanks for pointing out! Included in commit 28bf914.

2. Instead of just alias -T to no_interpolate, we may want to more Pythonic parameters.

You mean splitting the functionality of -T to have additionally separate parameters for +o and +s?

[seisman]

You mean splitting the functionality of -T to have additionally separate parameters for +o and +s?

Yes.

[seisman]

The full syntax of the -T option is -T[+o[<pen>]][+s], so here are all the possibilities:

• -T
• -T+s
• -T+o
• -T+s+o
• -T+o<pen>
• -T+o<pen>+s

Instead of alias -T to no_interpolation, maybe we can alias is to tileplot instead? The name tileplot comes from the comment
here https://github.com/GenericMappingTools/gmt/blob/586699fa813c176cd271793bcd375a6f722c56f6/src/grdview.c#L708, although GMT uses no_interp at https://github.com/GenericMappingTools/gmt/blob/586699fa813c176cd271793bcd375a6f722c56f6/src/longopt/grdview_inc.h#L43.

So, we can use two parameters tileplot and tile_outline:

• -T => tileplot=True
• -T+s => tileplot="skipnans"
• -T+o => tile_outline=True
• -T+s+o => tileplot="skipnans", tile_outline=True
• -T+o<pen> => tile_outline=<pen>
• -T+o<pen>+s => tileplot="skipnans", tile_outline=<pen>