Be able to move pieces in PPN viewer by using mouse in the plot

[trevorld]

• We can program based on "click", "double-click", "brush", and "hover": https://mastering-shiny.org/action-graphics.html#interactivity

• Given pixel information in a 2D plot, may not be crazy hard to figure out the top-most piece near the click

• Figuring that out in 3D plot seems like would be much harder to do

• Could be interested in:

  • Removing clicked piece
  • Adding new piece to that spot
  • Moving piece over to new spot
  • Transforming piece to new piece (or 3D rotation)
  • Displacement capture?
  • Swap?