renaming backend, cellxgene to server, client respectively

client/src/util/renderQueue.js

@@ -0,0 +1,82 @@
+// jshint esversion: 6
+/*****************************************
+******************************************
+Render Queue via http://bl.ocks.org/syntagmatic/raw/3341641/render-queue.js
+******************************************
+******************************************/
+
+const renderQueue = function(callback1234) {
+  var _queue = [], // data to be rendered
+    _rate = 300, // number of calls per frame
+    _invalidate = function() {}, // invalidate last render queue
+    _clear = function() {}; // clearing function
+
+  var rq = function(ARRAY_FROM_CELLXGENE) {
+    if (ARRAY_FROM_CELLXGENE) rq.data(ARRAY_FROM_CELLXGENE);
+    _invalidate();
+    _clear();
+    rq.render();
+  };
+
+  rq.render = function() {
+    var valid = true;
+    _invalidate = rq.invalidate = function() {
+      valid = false;
+    };
+
+    function doFrame() {
+      if (!valid) return true;
+      var chunk = _queue.splice(0, _rate);
+      chunk.map(callback1234);
+      timer_frame(doFrame);
+    }
+
+    doFrame();
+  };
+
+  rq.data = function(ARRAY_FROM_CELLXGENE) {
+    _invalidate();
+    _queue = ARRAY_FROM_CELLXGENE.slice(0); // creates a copy of the data
+    return rq;
+  };
+
+  rq.add = function(data) {
+    _queue = _queue.concat(data);
+  };
+
+  rq.rate = function(value) {
+    if (!arguments.length) return _rate;
+    _rate = value;
+    return rq;
+  };
+
+  rq.remaining = function() {
+    return _queue.length;
+  };
+
+  // clear the canvas
+  rq.clear = function(func) {
+    if (!arguments.length) {
+      _clear();
+      return rq;
+    }
+    _clear = func;
+    return rq;
+  };
+
+  rq.invalidate = _invalidate;
+
+  var timer_frame =
+    window.requestAnimationFrame ||
+    window.webkitRequestAnimationFrame ||
+    window.mozRequestAnimationFrame ||
+    window.oRequestAnimationFrame ||
+    window.msRequestAnimationFrame ||
+    function(callback) {
+      setTimeout(callback, 17);
+    };
+
+  return rq;
+};
+
+export default renderQueue;