Mesh selection

[germa89]

As the title.

This PR should enable mesh interactive picking when using mapdl.%XSEL%("%Y%", "P") where %XSEL% is a selection command such as vsel, or asel. It should work also with esel and lsel but I didn't test it. The commands ksel and nsel were already implemented in another PR (#1123). %Y% is a selection type, meaning S for new selection, R for reselecting, U for unselecting and A for adding.

When issued for example mapdl.vsel("s", "P"), it should show a window:

I rather you do not read much of the following, the window shown should be self-explanatory

with the volumes being pickable using the right button.

You can change between selecting and unselecting mode pressing the key U.

Finally, when closing the window, you should get back an array with the ids of the entities selected:

>>> mapdl.vsel("s", "P")
array([1])

Notes

• Do we want to pick with the right or left mouse button?
• I am quite interested in testing all edge cases. For example, the addition case, A.

[codecov]

Codecov Report

Merging #2207 (ab6c421) into main (e3885fb) will increase coverage by 1.33%.
Report is 95 commits behind head on main.
The diff coverage is 92.47%.

@@            Coverage Diff             @@
##             main    #2207      +/-   ##
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+ Coverage   86.39%   87.72%   +1.33%     
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  Files          45       45              
  Lines        7977     8410     +433     
==========================================
+ Hits         6892     7378     +486     
+ Misses       1085     1032      -53     

[germa89]

This PR will need manual testing.

Pinging @clatapie @mikerife @mcMunich @pmaroneh for manual testing.

Example code for testing:

from ansys.mapdl.core import launch_mapdl
import numpy as np

mapdl = launch_mapdl(start_instance=False)
mapdl.clear()
mapdl.prep7()
mapdl.block(0, 1, 0, 1, 0, 1)

mapdl.block(-2, 0, -2, 0, 1, 2)

mapdl.asel("s", "P")
mapdl.vsel("s", "P")
mapdl.lsel("s", "P")  # I didn't test this one.

[germa89]

Updated PR description

[clatapie]

The lsel doesn't seem to work on my side.
When I click on one line, all the lines are selected at once and I can't unselect them one by one as it seems it's considered as one line:

>>> mapdl.lsel("s", "P")
array([1])

Apart from that, the other commands run fine on my local installation:

>>> mapdl.asel("s", "P")
array([ 8, 10, 12])

>>> mapdl.vsel("s", "P")
array([2])

[germa89]

[germa89]

LSEL is fixed. Please @clatapie check it out again please.

[clatapie]

I confirm: it works fine on my local installation after the latest changes.

>>> mapdl.lsel("s", "P")
array([ 1,  6, 11, 12, 23])

[clatapie]

LGTM!

[mcMunich]

One suggestion: the nsel works but since it only shows nodes it is hard to determine what exactly is being selected.
ADPL Classic you can pick nodes when viewing elements (eplot then nsel):

And the nplot is the right plot obviously for picking nodes but the surfaces help guide the user around the model (ease of use):

[germa89]

I can try to add areas/lines with some sort of transparency... I can look into this.

Did you @mcMunich try using "R", "A", etc?? For instance:

mapdl.lsel("s", vmin=2)
mapdl.lsel("r", "P") # Check there is a line already selected)