This is a bounding box annotation tool. Pretty simple.
Zoom: scroll
Pan: ctrl + drag
New box: drag
Select box: shift + click on box
Select box vertex: shift + click on vertex
Move box: shift + drag on box
Edit box: shift + drag on vertex
Arrow keys: move/alter box
arrow keys to move/edit bounding boxes
undo: ctrl + z
redo: ctrl + shift + z
The second example is proof this is a pixel perfect tool.
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