Highlight selected line by changing line width or line color

[waydevin]

When users tap on a multi-lines line chart I want to make the nearest selected line change either it's width or it's color to let them know which line they're selecting.

What I could think about solving this problem in a method of ChartViewDelegate:

func chartValueSelected(chartView: ChartViewBase, entry: ChartDataEntry, dataSetIndex: Int, highlight: ChartHighlight){
  switch dataSetIndex{
  case 0:
  // reset chart to highlight line 0
  case 1: 
  // reset chart to highlight line 1
  default: //...

}

This method seem to be the only one that allows me to do some changes to a line chart depending on user's tapping on a line chart.

I could reset a line chart's data set which contains the line width/color properties to achieve what I want,
but I think it's not worthy to reset a whole chart for highlighting just one line.

Is there any easier way to do this?
Thanks for this awesome library and your support!

[liuxuan30]

I would prefer override drawLinear/Cubic to check highlight there and highlight the line by colors. Overrding highlighted method would require another loop connecting the dots