Re: Dot-notehead collision

[address@hidden]

On Mar 15, 2011, at 6:51 PM, Carl Sorensen wrote:

> 
> 
> 
> On 3/15/11 2:59 PM, "address@hidden" <address@hidden> wrote:
> 
>> On Mar 15, 2011, at 5:04 PM, Phil Holmes wrote:
>> 
>>> ----- Original Message ----- From: "Trevor Daniels" <address@hidden>
>>> To: <address@hidden>; "lilypond-user" <address@hidden>
>>> Sent: Tuesday, March 15, 2011 6:24 PM
>>> Subject: Re: Dot-notehead collision
>>> 
>>> 
>>>> 
>>>> address@hidden wrote Tuesday, March 15, 2011 5:00 PM
>>>> 
>>>>> \relative c' { \time 3/4 << { <cis a'>4 <b fis'>2 } \\ { d2. } >> }
>>>>> 
>>>>> Produces the attached output.  Is there a way to get it so that the dot
>>>>> does not collide with the notehead (w/o resorting to extra offsets and the
>>>>> like)?
>>>> 
>>>> I don't think so.  You'll need 'force-hshift.
>>>> 
>>>> Trevor
>>> 
>>> 
>>> Agreed. I tried a number of other things, but h-shift worked out of the box.
>>> 
>>> 
>> 
>> Perhaps a stupid question - in traditional engraving, is there ever an
>> instance where, in 2 voice polyphony, the note column w/ a downward pointing
>> stem is placed to the right of note column with an upward pointing stem?  I
>> hacked a solution that does this and it looks much clearer than moving in the
>> other direction (see attached).  However, if it is not Kosher, I'll scrub it.
>> 
>> \relative c' { \time 3/4 << { <cis a'>4 <b fis'>2 }
>> \\ { \once \override Voice . NoteColumn #'force-hshift = #1.25 d2. } >> }
>> 
>> \relative c' { \time 3/4 << { <cis a'>4 <b fis'>2 }
>> \\ { \once \override Voice . NoteColumn #'force-hshift = #-1.25 d2. } >> }
>> 
>> 
> 
> In the words of Read (p. 68) "When two separate note-heads are required for
> a unison, it is important to differentiate the voices clearly.  The note
> having its stem *up* (almost invariably the upper voice) is positioned
> first, to the left, while the note with the *downward* stem (lower voice,
> ususally, goes to the right -- as shown in the previous two lower examples.
> The validity of this principle is especially apparent when when the
> down-stemmed note is dotted (left-hand example belos).  Whe, however, the
> upward-stemmed note is dotted, it is positioned to the right so that the dot
> will not be obscured (right, below)."
> 
> So, in my reading of his words, the downward stem is normally to the right
> of the upward stem.  But if there's a dot, the upward stem will be to the
> right of the downward stem to avoid collisions.
> 
> So in your example, the first snippet is right, the second snippet is wrong.
> This almost exactly matches Read's examples.
> 
> HTH,
> 
> Carl
> 

[moved to devel from user]

It seems that this should be default output, then.  I imagine that it'd be a 
4-5 line fix tops (checking for dots & durlog, then the shift).  Any takers?

Cheers,
MS