The frame is only for reference, what I need is that the background is not
wider than or higher than the frame, changing the coordinates of the points can
be done but I remember seeing an example in which using "shifted" it could be
done move to a corner, without worrying about the coordinates or point size
\startuseMPgraphic{fullheightbackground}
fill unitsquare xyscaled (OverlayWidth, OverlayHeight) withcolor "gray" ;
w := MakeupWidth;
h := OverlayHeight;
draw (0,0)--(w,0) withpen pencircle scaled 2pt withcolor green;
draw (0,h)--(w,h) withpen pencircle scaled 2pt withcolor green;
drawdot (0,0) withpen pencircle scaled 8pt withcolor red;
drawdot (w,h) withpen pencircle scaled 8pt withcolor red;
\stopuseMPgraphic
\defineoverlay
[fullheightbackground]
[\useMPgraphic{fullheightbackground}]
\setupframedtexts
[background=fullheightbackground,
backgroundoffset=0pt,
frame=off]
\starttext
\startframedtext[width=\textwidth,align=left]
\input knuth
\stopframedtext
\stoptext
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