qdel

   '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.

Surfaces will not be deleted when the user deletes lines which define complete holes in existing surfaces. But it is necessary that all lines of a certain hole are deleted at once. If only a partial hole is deleted, the surface is deleted as well. It is proposed to use zap to delete the affected lines.

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.