fixes #637 -- tempo block can support multiple beats per minute

Author: walterbender

css/activity.css

@@ -444,13 +444,6 @@ table {
     background: rgba(255, 255, 255, 0.85);
 }
 
-#tempoCanvas {
-    visibility: hidden;
-    position: absolute;
-    border: 1 !important;
-    background: rgba(255, 255, 255, 0.85);
-}
-
 #pscDiv {
     position: absolute;
     top: 20%;

index.html

@@ -207,9 +207,6 @@
 	<video id="camVideo" style="visibility:hidden;">
 	</video>
 
-	<canvas id="tempoCanvas" width="700" height="100" style="visibility:hidden;">
-	</canvas>
-
 	<canvas id="camCanvas" style="visibility:hidden;">
 	</canvas>
 

js/logo.js

@@ -2184,9 +2184,9 @@ function Logo(pitchtimematrix, pitchdrummatrix, rhythmruler,
                 logo.defaultBPMFactor = TONEBPM / this._masterBPM;
             }
             if (this.inTempo) {
-                tempo.BPMBlock = blk;
+                tempo.BPMBlocks.push(blk);
                 var bpmnumberblock = blocks.blockList[blk].connections[1]
-                tempo.BPM = blocks.blockList[bpmnumberblock].text.text;
+                tempo.BPMs.push(blocks.blockList[bpmnumberblock].text.text);
             }
             break;
         case 'setbpm':
@@ -2276,6 +2276,8 @@ function Logo(pitchtimematrix, pitchdrummatrix, rhythmruler,
             childFlow = args[0];
             childFlowCount = 1;
             logo.inTempo = true;
+            tempo.BPMblocks = [];
+            tempo.BPMs = [];
 
             var listenerName = '_tempo_' + turtle;
             logo._setDispatchBlock(blk, turtle, listenerName);