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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 +stem lengths +such that all the beams in the various measures will lie on the same line. +You can then use the +line command +to fill in the gaps in the beams across the bar lines. +
+
+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.
+
+// 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) +
