code: function(iStartY, iTickSize) {
          // this.logger.log("setYTicks: " + iStartY + ", " + iTickSize
                 // + ", " + this.initPageY + ", " + this.minY + ", " + this.maxY );
          this.yTicks = [];
          this.yTickSize = iTickSize;
  
          var tickMap = {};
  
          for (var i = this.initPageY; i >= this.minY; i = i - iTickSize) {
              if (!tickMap[i]) {
                  this.yTicks[this.yTicks.length] = i;
                  tickMap[i] = true;
              }
          }
  
          for (i = this.initPageY; i <= this.maxY; i = i + iTickSize) {
              if (!tickMap[i]) {
                  this.yTicks[this.yTicks.length] = i;
                  tickMap[i] = true;
              }
          }
  
          this.yTicks.sort(this.DDM.numericSort) ;
          this.logger.log("yTicks: " + this.yTicks.join());
      }
docs: Create the array of vertical tick marks if an interval was specified in
  setYConstraint().
  @method setYTicks
  @private