Problem with mkiv and MPgraphic

[Otared Kavian <otared@gmail.com>]

Hi,

The following doesn't show the "swelled rule" defined below in mkiv,  
while on mkii it is fine?
So my question is: is there a new way to define MPgraphic in mkiv?

Best regards: OK

%% defining swelled ruel, or English rule...
\setupMPvariables[SwelledRule][height=2pt,breadth=.667\localhsize]
\startuniqueMPgraphic{SwelledRule}{height,breadth}
x1 = 0; x2 = x6 = .333x4; x3 = x5 = .667x4; x4 = \MPvar{breadth};
y1 = y4 = \MPvar{height}/2; y2 = y3 = \MPvar{height}; y5 = y6 = 0;
fill z1--z2--z3--z4--z5--z6--cycle;
\stopuniqueMPgraphic
\def\SwelledRule{\blank%
\setlocalhsize\midaligned{\reuseMPgraphic{SwelledRule}}\blank}
%% end swelled rule

\starttext

This file has been typeset
on \currentdate{}
at \currenttime,
with
\doifmodeelse{mkiv}
	{mkiv,
	LuaTeX revision \luatexrevision,
	(LuaTeX date stamp \luatexdatestamp),}
	{mkii,
	using the command:
	\type{texexec basic-test.tex}},
ConTeXt version \contextversion.
% LuaTeX version \luatexversion,

Below should be a swelled rule: it appears with mkii, but not in mkiv 
\dots

\SwelledRule

\stoptext

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