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Cross-bar beaming
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<H2>
Cross-bar beaming
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Generally, beams do not cross bar lines, and Mup follows that rule.
However, if you want beams to cross a bar line, there are at least two
possible approaches to getting the
desired effect. The first is to explicitly specify
<A HREF="chrdattr.html#stemlen">stem lengths</A>
such that all the beams in the various measures will lie on the same line.
You can then use the
<A HREF="linecurv.html">line command</A>
to fill in the gaps in the beams across the bar lines.
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The other approach is to draw in the bar line using the "line" construct.
To do this you first tell Mup that a measure is twice as long as is really
is, so that you can put two actual measures inside what Mup thinks is a
single measure. Here is an example.
<BR><PRE>
// First make an empty measure ending with an
// invisible bar. This is for the sole purpose
// of allowing the real time signature to be
// printed and would not be necessary if we
// wanted to cross a bar line other than
// the very first bar line of the piece.
1: ms;
invisbar
// Now, make the effective time signature twice
// as long as the real time signature, but use 'n' so this fake
// time signature is not actually printed.
// Set up for beaming across the entire double-length measure.
// (You could could use other beamstyles if you wish, or custom beaming.)
score time=8/4n
beamstyle=1/2
music
// Now do the double-length measure. On the chord
// just after where we want a bar line, add some extra
// padding and set a location tag so that we can draw
// a bar line relative to the tag.
1: 8c;e;f;d;g;e;f;a; [pad 3; =a]g;e;f;a;g;d+;4c+;
// Also set a location tag on the next bar line,
// so that we can get the vertical endpoints of the
// bar line that we draw from the endpoints of the
// normal Mup-supplied bar line.
bar =b
// Now draw the bar line that goes through the beam.
// Use the horizontal position relative to the "a"
// location tag on the chord in the second actual measure,
// and get the vertical endpoints from the "b" tag
// associated with the next bar line.
line (a.w + 1, b.y + 4) to (a.w + 1, b.y - 4)
</PRE><BR>
<IMG SRC="mugex109.gif" ALT="Picture of Mup output"><BR>
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