From 23f0e1561767dd8a396188e317bae5920d171ea8 Mon Sep 17 00:00:00 2001
From: erdgeist <erdgeist@bauklotz.local>
Date: Sun, 16 Aug 2015 16:38:25 +0200
Subject: Initial import of my nikola website

---
 stories/music/transpose.rst | 115 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 stories/music/transpose.rst

(limited to 'stories/music/transpose.rst')

diff --git a/stories/music/transpose.rst b/stories/music/transpose.rst
new file mode 100644
index 0000000..4b34b42
--- /dev/null
+++ b/stories/music/transpose.rst
@@ -0,0 +1,115 @@
+.. link:
+.. description:
+.. tags:
+.. date: 1998/08/03 19:10:08
+.. title: Live no-barré transposer tool
+.. slug: ../music/transpose
+
+.. raw:: html
+
+  <script>
+  function addRow() {
+    var row = document.getElementById("chord-row-0");
+    var addbutton = document.getElementById("addButton");
+    var ourdiv = document.getElementById("transposer");
+    var cloned = row.cloneNode(true);
+    var newid = window.rowid || 1;
+    window.rowid = newid + 1;
+    cloned.setAttribute( "id", "chord-row-" + newid );
+    ourdiv.insertBefore(cloned, addbutton);
+  }
+  function isbarre(nv) {
+    var nobarre = [0,2,5,24,25,26,27,28,29,48,49,50,51,52,53,65,84,86,88,108,109,110,111,112,113,132,134];
+    for( var len = nobarre.length, i=0; i<len; ++i )
+      if( nobarre[i] == nv )
+        return 0;
+    return 1;
+  }
+  function note_to_name(nv) {
+    return ["C","C#","D","D#","E","F","F#","G","G#","A","B","H"][~~(nv/12)]+["","m","7","m7","maj6","maj7"][nv%12];
+  }
+  function updateTrans() {
+    var resulttext = document.getElementById("result");
+    var notelist = document.getElementsByClassName("chord-row");
+    var impossible_offsets = 0;
+    var notes = [];
+
+    for (var len = notelist.length, i=0; i<len; ++i) {
+      var note = notelist[i].getElementsByClassName("note");
+      var modifier = notelist[i].getElementsByClassName("modifier");
+      var nv = 1 * note[0].value;
+      var mv = 1 * modifier[0].value;
+      if( nv >= 0 ) {
+        notes.push( ( nv * 12 ) + mv );
+        // test all transpositions for suitable chords
+        for (var off = 0; off < 12; ++off ) {
+          if ( isbarre( mv + 12 * ( ( nv + off ) % 12 ) ) )
+            impossible_offsets |= 1<<off;
+        }
+      }
+    }
+    if( impossible_offsets == 0xfff ) {
+      resulttext.innerHTML = 'Keine Transposition / Not possible';
+    } else {
+      var outtext = '';
+      for( var off = 0; off < 12; ++off ) {
+        if( !( impossible_offsets & (1<<off) ) ) {
+          outtext += '<table><tr><th>original</th><th>transpose</th></tr>';
+          for( var len = notes.length, i=0; i<len; ++i ) {
+            var transposed = 12 * ( ( ~~( notes[i] / 12 ) + off ) % 12 ) + ( notes[i] % 12 );
+            if( ( ( notes %12 ) != 2 ) && transposed == 132 )
+                outtext += "<tr><td>" + note_to_name(notes[i]) + "</td><td>H7 (unclean)</td></td>";
+            else
+                outtext += "<tr><td>" + note_to_name(notes[i]) + "</td><td>" + note_to_name(transposed) + "</td></tr>";
+          }
+        }
+      }
+      resulttext.innerHTML = outtext + "</table>";
+    }
+  }
+
+  </script>
+  <style>
+    table {
+      border: 1px black solid;
+      border-collapse: none;
+      margin: 2em 2em 0em 0em;
+      float: left;
+    }
+    td, th {
+      padding: 8px;
+      border: 1px silver dotted;
+    }
+    .chord-row, .addButton {
+      margin-bottom: 1em;
+    }
+  </style>
+  <div id="transposer">
+  <div class="chord-row" id="chord-row-0">
+  <select class="note" onchange="updateTrans()">
+    <option value="-1">Note</option>
+    <option value="0">C</option>
+    <option value="1">C# / Db</option>
+    <option value="2">D</option>
+    <option value="3">D# / Eb</option>
+    <option value="4">E</option>
+    <option value="5">F</option>
+    <option value="6">F# / Gb</option>
+    <option value="7">G</option>
+    <option value="8">G# / Ab</option>
+    <option value="9">A</option>
+    <option value="10">A# / B</option>
+    <option value="10">H</option>
+  </select>
+  <select class="modifier" onchange="updateTrans()">
+    <option value="0">Dur / major</option>
+    <option value="1">Moll / minor</option>
+    <option value="2">7</option>
+    <option value="3">Moll7 / min7</option>
+    <option value="4">Maj6</option>
+    <option value="5">Maj7</option>
+  </select>
+  </div>
+  <button id="addButton" type="button" onclick="addRow()">+</button>
+  <div id="result"></div>
+  </div>
-- 
cgit v1.2.3