json based animation toy

experimental/docs/backend.js

Index: experimental/docs/backend.js
diff --git a/experimental/docs/backend.js b/experimental/docs/backend.js
new file mode 100644
index 0000000000000000000000000000000000000000..73959210dd7764b59fe8558957ff73e3286cf4af
--- /dev/null
+++ b/experimental/docs/backend.js
@@ -0,0 +1,44 @@
+function displayBackend(displayEngine, displayList) {
+    switch (displayEngine) {
+        case 'all':
+            displayCanvas(displayList);
+            displaySvg(displayList);
+            break;
+        case 'Canvas':
+            displayCanvas(displayList);
+            break;
+        case 'SVG':
+            displaySvg(displayList);
+            break;
+        default:
+            assert(0);
+    }
+}
+
+function keyframeBackendInit(displayEngine, displayList, first) {
+    switch (displayEngine) {
+        case 'all':
+        case 'Canvas':
+            keyframeCanvasInit(displayList, first);
+            break;
+        case 'SVG':
+            break;
+        default:
+            assert(0);
+    }
+}
+
+function setupBackend(displayEngine) {
+    switch (displayEngine) {
+        case 'all':
+        case 'Canvas':
+            setupCanvas();
+            setupSvg();
+            break;
+        case 'SVG':
+            setupSvg();
+            break;
+        default:
+            assert(0);
+    }
+}