This bit of lisp code will toggle the background color from white to black to white in whatever space you are in. (no effect on the block editor though…)
(vl-load-com)
(defun c:TBC (/ pref col tm)
(setq tm (getvar "tilemode"))
(setq pref (vla-get-display
(vla-get-Preferences
(vlax-get-acad-object)
)
)
)
(if (zerop tm)
(setq cur (vla-get-graphicswinlayoutbackgrndcolor pref))
(setq cur (vla-get-graphicswinmodelbackgrndcolor pref))
)
(setq col (vlax-variant-value
(vlax-variant-change-type
cur
vlax-vblong
)
)
)
(if (not (or (eq col 0) (eq col 16777215)))
(setq col 0)
)
(cond ((zerop tm)
(vla-put-graphicswinlayoutbackgrndcolor
pref
(vlax-make-variant (abs (- col 16777215)) vlax-vblong)
)
(vla-put-layoutcrosshaircolor
pref
(vlax-make-variant col vlax-vblong)
)
)
(t
(vla-put-graphicswinmodelbackgrndcolor
pref
(vlax-make-variant (abs (- col 16777215)) vlax-vblong)
)
(vla-put-modelcrosshaircolor
pref
(vlax-make-variant col vlax-vblong)
)
)
)
(vlax-release-object pref)
(princ)
)
