[jmsl] Rest toggle - cool!

[jmsl at music.columbia.edu]

Hi Peter
Here's source for RestToggle Transform...
Nick

package com.softsynth.jmsl.score.transforms;

import java.util.Enumeration;
import java.util.Hashtable;

import com.softsynth.jmsl.score.*;

/**
 * Toggle a note between rest and pitch
 *
 * @author Nick Didkovsky, copyright 2000 Nick Didkovsky, all rights 
reserved
 * 
 */
public class RestToggleTransform extends NotePropertiesTransform {

    Hashtable oldValues = new Hashtable();

    public RestToggleTransform() {
        setName("Rest Toggle");
    }

    /**
     * If a note is NOT a rest, make it a rest. If it IS a rest, make it 
middle C. If it is a rest
     * which used to be a note, then change it back to the original 
pitch. A Note is made into a
     * rest by setting its pitch data to 0, followed by 
NoteFactory.updateFromPitch(note);
     * 
     */
    public void operate(Score score, SelectionBuffer selectionBuffer) {
        for (Enumeration e = selectionBuffer.elements(); 
e.hasMoreElements();) {
            Note note = (Note) e.nextElement();
            if (note.isRest()) {
                double pitch = NoteFactory.MIDDLE_C;
                if (oldValues.containsKey(note)) {
                    pitch = ((Double) oldValues.get(note)).doubleValue();
                }
                note.setPitchData(pitch);
                note.setVelData(0.5);
            } else {
                oldValues.put(note, new Double(note.getPitchData()));
                note.setPitchData(0);
            }
            NoteFactory.updateFromPitch(note);
        }
        score.setDirty(true);
    }

    public static final String copyright = "copyright (C) 2000 Nick 
Didkovsky, all rights reserved";
}

jmsl at music.columbia.edu wrote:
> Hi Nick,
>
> I was poking around with the newish release of JMSL and discovered the 
> RestToggleTransform.  It works great (on chords too!), but I'm unclear 
> as to how it's working.
>
> From what I can tell, the pitch data is being changed, but how is the 
> old pitch data being stored?  Even if I go off and transform some 
> other notes, I can still come back and switch around the old notes.
>
> The notes don't have a userBean added to them, and the dns changes the 
> pitch data to 0. to make rests.  Making changes to the note, such as 
> changing duration or inserting notes in front of it (or adding 
> intervals) doesn't prevent it from working.
>
> The only thing that makes it forget its pitch is if you change a note 
> to a rest, copy the rest, and paste it.  Then the rest is restored as 
> middle C (as would happen with notes that were initially entered as 
> rests).
>
> In any case, I was just curious how you did this and wondering if I 
> was missing something obvious.  It's definitely a great addition to 
> the JMSL toolkit!
>
> thanks,
> Peter McCulloch
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