add docs about header variables $LWDISPLAY and $LWDISPSCALE
@@ -30,6 +30,16 @@ You have to enable the option to show lineweights in your CAD application or
viewer to see the effect on screen, which is often disabled by default, the same
has to be done in the page setup options for plotting lineweights.
+Setting the HEADER variable ``$LWDISPLAY`` to 1 may activate support for
+showing lineweights on screen and ``$LWDISPSCALE`` may scale the lineweight
+on screen::
+
+ # activate on screen lineweight display
+ doc.header["$LWDISPLAY"] = 1
+ # lineweight scaling factor for on screen display
+ doc.header["$LWDISPSCALE"] = 0.55
+
+
.. image:: ../gfx/valid_lineweights.png
