code: function (val, backwards, cvsCoord, old, handleLog, pointPlacement) {
              var axis = this,
                sign = 1,
                cvsOffset = 0,
                localA = old ? axis.oldTransA : axis.transA,
                localMin = old ? axis.oldMin : axis.min,
                returnValue,
                minPixelPadding = axis.minPixelPadding,
                postTranslate = (axis.options.ordinal || (axis.isLog && handleLog)) && axis.lin2val;
  
              if (!localA) {
                  localA = axis.transA;
              }
  
              // In vertical axes, the canvas coordinates start from 0 at the top like in
              // SVG.
              if (cvsCoord) {
                  sign *= -1; // canvas coordinates inverts the value
                  cvsOffset = axis.len;
              }
  
              // Handle reversed axis
              if (axis.reversed) {
                  sign *= -1;
                  cvsOffset -= sign * (axis.sector || axis.len);
              }
  
              // From pixels to value
              if (backwards) { // reverse translation
  
                  val = val * sign + cvsOffset;
                  val -= minPixelPadding;
                  returnValue = val / localA + localMin; // from chart pixel to value
                  if (postTranslate) { // log and ordinal axes
                      returnValue = axis.lin2val(returnValue);
                  }
  
                  // From value to pixels
              } else {
                  if (postTranslate) { // log and ordinal axes
                      val = axis.val2lin(val);
                  }
                  if (pointPlacement === 'between') {
                      pointPlacement = 0.5;
                  }
                  returnValue = sign * (val - localMin) * localA + cvsOffset + (sign * minPixelPadding) +
                    (isNumber(pointPlacement) ? localA * pointPlacement * axis.pointRange : 0);
              }
  
              return returnValue;
          }
docs: Translate from axis value to pixel position on the chart, or back