getLowestVisibleX method
Returns the lowest x-index (value on the x-axis) that is still visible on the chart.
@return
Implementation
@override
double getLowestVisibleX() {
getTransformer(AxisDependency.left)!.getValuesByTouchPoint2(
viewPortHandler!.contentLeft(),
viewPortHandler!.contentBottom(),
posForGetLowestVisibleX);
double result = max(xAxis!.axisMinimum!, posForGetLowestVisibleX.x);
return result;
}