minor cleanups.

lib/timeline/DataStep.js

@@ -26,9 +26,7 @@
  */
 function DataStep(start, end, minimumStep, containerHeight, customRange, formattingFunction, alignZeros) {
   // variables
-  this.current = 0;
-
-  this.autoScale = true;
+  this.current = -1;
   this.stepIndex = 0;
   this.step = 1;
   this.scale = 1;
@@ -36,7 +34,6 @@ function DataStep(start, end, minimumStep, containerHeight, customRange, formatt
 
   this.marginStart;
   this.marginEnd;
-  this.deadSpace = 0;
 
   this.majorSteps = [1,     2,    5,  10];
   this.minorSteps = [0.25,  0.5,  1,  2];
@@ -67,13 +64,9 @@ DataStep.prototype.setRange = function(start, end, minimumStep, containerHeight,
   this._end = customRange.max === undefined ? end : customRange.max;
   if (this._start === this._end) {
     this._start = customRange.min === undefined ? this._start - 0.75 : this._start;
-    this._end = customRange.max === undefined ? this._end + 1 : this._end;;
-  }
-
-  if (this.autoScale === true) {
-    this.setMinimumStep(minimumStep, containerHeight);
+    this._end = customRange.max === undefined ? this._end + 1 : this._end;
   }
-
+  this.setMinimumStep(minimumStep, containerHeight);
   this.setFirst(customRange);
 };
 
@@ -138,9 +131,7 @@ DataStep.prototype.setFirst = function(customRange) {
     this.marginEnd += this.marginEnd % this.step;
   }
 
-  this.deadSpace = this.roundToMinor(niceEnd) - niceEnd + this.roundToMinor(niceStart) - niceStart;
   this.marginRange = this.marginEnd - this.marginStart;
-
   this.current = this.marginEnd;
 };
 
@@ -194,6 +185,7 @@ DataStep.prototype.previous = function() {
 DataStep.prototype.getCurrent = function() {
   // prevent round-off errors when close to zero
   var current = (Math.abs(this.current) < this.step / 2) ? 0 : this.current;
+
   var returnValue = current;
   if (typeof this.formattingFunction === 'function') {
     return this.formattingFunction(current);