added first direct vexflow Exporter using m21j -- very alpha

cuthbertLab · Nov 11, 2013 · bdcb44a · bdcb44a · mscuthbert · Nov 11, 2013
1 parent 274777c
commit bdcb44a
Showing 1 changed file with 121 additions and 0 deletions.
diff --git a/music21/vexflow/exporter.py b/music21/vexflow/exporter.py
@@ -0,0 +1,121 @@
+import json
+
+template = r'''<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns = "http://www.w3.org/1999/xhtml">
+<head>
+ <title>Music21 Fragment</title>
+ <meta http-equiv="content-type" content="text/html; charset=utf-8" />
+ <script src='http://code.jquery.com/jquery-latest.js'></script>
+ <!-- vexflow -->
+ <script src="http://ciconia.mit.edu/m21j/ext/vexflow/vexflow-min.js"></script>
+
+ <!-- music21j -->
+ <script src="http://ciconia.mit.edu/m21j/music21jExp.js" type="text/javascript"></script> 
+</head>
+<body>
+<script type="text/javascript">
+
+%s
+
+window.onload = function () {
+   %s
+};
+
+</script>
+<div class="document">
+</div>
+
+</body>
+</html>'''
+
+loadFunction = r'''
+    //var score = Music21.parseJSON(dataAssignment);
+    var jsonObj = JSON.parse(dataAssignment);
+    s = new Music21.Score();
+    s.tempo = 60;
+    s.timeSignature = '3/4';
+    for (var i = 0; i < jsonObj['__attr__']['_elements'].length; i++) {
+        var jsonPart = jsonObj['__attr__']['_elements'][i];
+        if (jsonPart['__class__'] != 'music21.stream.Part') {
+            continue;
+        }
+        
+        
+        var part = new Music21.Part();
+        if (i < 2) {
+            part.clef = new Music21.Clef('treble');
+        } else {
+            part.clef = new Music21.Clef('bass');
+        }
+        //console.log('got part');
+        for (var m = 0; m < jsonPart['__attr__']['_elements'].length; m++) {
+            //console.log('got measure');
+            var jsonMeasure = jsonPart['__attr__']['_elements'][m];
+            if (jsonMeasure['__class__'] != 'music21.stream.Measure') {
+                continue;
+            }
+
+
+            var measure = new Music21.Measure();
+            for (var nI = 0; nI < jsonMeasure['__attr__']['_elements'].length; nI++) {
+                var noteObj = jsonMeasure['__attr__']['_elements'][nI];
+                if (noteObj['__class__'] != 'music21.note.Note') {
+                    continue;
+                }
+                var n = new Music21.Note();
+                //console.log(noteObj);
+                var pitchObj = noteObj['__attr__']['pitch'];
+                n.pitch.step = pitchObj['__attr__']['_step'];
+                n.pitch.octave = pitchObj['__attr__']['_octave'];
+                var durationObj = noteObj['__attr__']['_duration'];
+                n.duration.quarterLength = durationObj['__attr__']['_qtrLength'];
+                measure.append(n);
+            }
+            part.append(measure)
+        }
+        s.append(part);
+    }    
+    s.appendNewCanvas();
+'''
+
+def getFormat(score):
+    from music21 import freezeThaw
+    sf = freezeThaw.JSONFreezer(score)
+    frozen = json.dumps(
+            sf.getJSONDict(includeVersion=True),
+            sort_keys=True,
+            );
+    return "var dataAssignment = '" + frozen + "'"
+
+def fillTemplate(score):
+    dataAssignment = getFormat(score)
+    return template % (dataAssignment, loadFunction)
+
+if __name__ == '__main__':
+    from music21 import corpus, converter, note, base, volume, duration, stream, environment
+    p = converter.parse('tinynotation: 3/4 c4 d4 e4 f4 g4 a4').makeMeasures()
+    s = stream.Score()
+    s.insert(0, p)
+    p2 = converter.parse('tinynotation: 3/4 A4 B4 c d e f').makeMeasures()
+    s.insert(0, p2)
+    s = corpus.parse('bwv66.6')
+
+    n = note.Note()
+    #s = stream.Stream()
+
+    b = base.Music21Object()
+    v = volume.Volume()
+    d = duration.Duration()
+    dataStr = fillTemplate(s)
+
+    environLocal = environment.Environment()
+    ext = '.html'    
+    fp = environLocal.getTempFile(ext)
+
+    f = open(fp, 'w')
+    f.write(dataStr)
+    f.close()
+    environLocal.launch(ext, fp)
+
+#### 
+# eof