reverted to setTimeout in safari per #83

src/graph/Graph.js

@@ -1901,13 +1901,23 @@ if (typeof window !== 'undefined') {
 
 /**
  * Schedule a animation step with the refreshrate interval.
- *
- * @poram {Boolean} runCalculationStep
  */
 Graph.prototype.start = function() {
   if (this.moving || this.xIncrement != 0 || this.yIncrement != 0 || this.zoomIncrement != 0) {
-    if (!this.timer) { 
-      this.timer = window.requestAnimationFrame(this._animationStep.bind(this), this.renderTimestep); // wait this.renderTimeStep milliseconds and perform the animation step function
+    if (!this.timer) {
+      var ua = navigator.userAgent.toLowerCase();
+      if (ua.indexOf('safari') != -1) {
+        if (ua.indexOf('chrome') <= -1) {
+          // safari
+          this.timer = window.setTimeout(this._animationStep.bind(this), this.renderTimestep); // wait this.renderTimeStep milliseconds and perform the animation step function
+        }
+        else {
+          this.timer = window.requestAnimationFrame(this._animationStep.bind(this), this.renderTimestep); // wait this.renderTimeStep milliseconds and perform the animation step function
+        }
+      }
+      else{
+        this.timer = window.requestAnimationFrame(this._animationStep.bind(this), this.renderTimestep); // wait this.renderTimeStep milliseconds and perform the animation step function
+      }
     }
   }
   else {