'qdel' RETURN 'w'|'a'|'i'|'r'|'p'|'l'|'s'|'b'|'S'|'L'|'h'|'q'This keyword is used to delete entities (see also del). Higher entities (depending ones) will be deleted to. To delete more than one entity with one stroke, type ”a” before and create a rectangular picking area by pressing two times the ”r” key. Both strokes define opposite corners of the rectangle. To delete only one entity type ”i” before. Press ”q” to quit the command.
It is also possible to measure distances between two pixels on the screen. Just press the key ”w” on the positions of the two pixels. The distance is calculated in the scale of the displayed geometry.