Hi, what is the reason the label direction prefix variables (rt, bot, llft, etc.) are prefixed with mpfun_ in MkIV (mp-mlib.mpiv)? When new directional prefixes are being defined it fails when mplib is used unless the mpfun_ prefix is added. And likewise, code using the mpfun_ prefix fails on traditional MetaPost.
Is this prefix required? It breaks old code and required a branch in
every new project. And I don't really see a reason for this
incompatibility. Here is an example defining a new direction “foo”:
\starttext
\startMPcode
label("first", origin);
%% MkIV
%% pair mfun_laboff.foo ; mfun_laboff.foo := (.5,-1) ;
%% mfun_labxf.foo := mfun_labyf.foo := 1 ;
%% MkII
pair laboff.foo ; laboff.foo := (.5,-1) ;
labxf.foo := labyf.foo := 1 ;
label.foo("second", origin);
\stopMPcode
\stoptext
Marco
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