code: function(newOffset) {
              this.logger.log(sub("picker update [{x}, {y}]", newOffset));
  
              var s=this._getS(), v=this._getV();
              this.set(this.OPT.SATURATION, Math.round(s*100), true);
              this.set(this.OPT.VALUE, Math.round(v*100), true);
  
              if (this.pickerSlider.valueChangeSource !== Slider.SOURCE_SET_VALUE) {
                  this._getValuesFromSliders();
              }
  
              this._updateFormFields();
              this._updateSwatch();
          }
docs: Event handler for the picker slider, which controls the
  saturation and value/brightness.
  @method _onPickerSliderChange
  @param newOffset {{x: int, y: int}} x/y pixels from the start position
  @protected