         buckets.push if _.min(bucket) >= 0 then bucket else null
 
     buckets
+
+
+class PingStrategy.BaseStrategy extends PingStrategy
+
+  velocityRangeStart : 0
+  velocityRangeEnd : Infinity
+
+  roundTripTimeRangeStart : 0
+  roundTripTimeRangeEnd : Infinity
+
+  preloadingSlides : 0
+  preloadingPriorityOffset : 0
 
 
   ping : (position, direction, zoomStep, areas, activePlane) ->

    pullQueue


class PingStrategy.Skeleton extends PingStrategy

  velocityRangeStart : 0
  velocityRangeEnd : Infinity

  roundTripTimeRangeStart : 0
  roundTripTimeRangeEnd : Infinity

  contentTypes : ["skeletonTracing"]



  getBucketArray : (center, width, height) ->

    buckets = []
    uOffset = Math.ceil(width / 2)
    vOffset = Math.ceil(height / 2)

