Re: lines/graphic notation?

[Mats Bengtsson]

You don't need that much competence in postscript.
Look at the following example:
a-\markup { \postscript #"0.1 setlinewidth 2 7 moveto 5 1 rlineto stroke" }

The first thing to know is that you always specify the argument
first and then the command to apply on the argument.
"0.1 setlinewidth" just specifies the line width
"2 7 moveto" moves the "pen" to its starting position, where 2 is the 
x-coordinate and 7 is the y-coordinate.
"5 1 rlineto stroke" makes the pen draw a straight line from
its starting position to a point 5 units to the right and 1 unit up
(the 'r' in rlineto stands for relative, use lineto if you want
absolute coordinates).
If you have a line with several corners, use several rlineto
before the stroke (which does the actual drawing):
1 1 rlineto 1 -1 rlineto 2 -3 rlineto stroke

Just as for all properties in LilyPond, the unit used for the
coordinates is the spacing between two staff lines.

If you want to do it in a lyrics line, I think it's possible to
specify a syllable like
"\\embeddedps{0.1 setlinewidth 2 7 moveto 5 1 rlineto stroke}"
as long as LilyPond uses TeX to process its output.
However, why not use markups (possibly connected to some invisible
staff if you want it on a separate line, look at the definition of
the Dynamics context in the template for piano with centered dynamics
if you want inspiration).

To answer your original question, a search for
postscript tutorial
in Google, provided for example
http://www.cs.indiana.edu/docproject/programming/postscript/postscript.html

   /Mats


D Josiah Boothby wrote:
> I don't think that the attachment worked right. The example can be seen at
>
> http://students.washington.edu/josiah/oscillation1.png
>
> josiah
>
> On Thu, 4 Nov 2004, D Josiah Boothby wrote:
>
> > Hello, all,
> >
> > I'd like to draw a (visually simple) oscillation line over a note. I 
> > realize it would probably require a knowledge of postscript... but I 
> > don't have any idea where to start with postscript. Ideally, the line 
> > would change direction at specific enough points so that they can be 
> > aligned in the measure with other things going on.
> >
> > I've included a Gimp-edited example which gives a basic idea as to 
> > what I'm trying to acheive. If at all possible, it would be ideal if I 
> > could set it up like a lyric staff:
> >
> > oscillation = { s4\instruction1 s16\instruction2 s\instruction3 ... }
> > notes = { bes1 }
> >
> > ...and end up putting them together, as I mentioned above like lyrics.
> >
> > Any ideas on how I can do this, or where to look to learn postscript?
> >
> > Thanks,
> >
> > Josiah
>
>
>
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--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
        Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
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