On 8/23/2013 11:42 AM, Marco Patzer wrote:
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.
So is anyone using mkiv still using MkII?
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”:
The MpIV code has namespace protection. Why run traditional in MkIV?
\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
I wasn't aware of users defining extra ones. I'll add this:
\starttext
\startMPcode
label("first", origin);
if known mfun_laboff :
vardef installlabel@\# (expr type, x, y, offset) =
numeric mfun_labtype @\# ; mfun_labtype @\# := type ;
pair mfun_laboff @\# ; mfun_laboff @\# := offset ;
numeric mfun_labxf @\# ; mfun_labxf @\# := x ;
numeric mfun_labyf @\# ; mfun_labyf @\# := y ;
enddef ;
else :
vardef installlabel@\# (expr type, x, y, offset) =
numeric labtype @\# ; labtype @\# := type ;
pair laboff @\# ; laboff @\# := offset ;
numeric labxf @\# ; labxf @\# := x ;
numeric labyf @\# ; labyf @\# := y ;
enddef ;
fi ;
installlabel.foo ( 0, 1, 1, (.5,-1) ) ;
label.foo("second", origin);
\stopMPcode
\stoptext
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