Adjust circle for selected point

[nicholassmith]

Is it possible to adjust the displayed circle for a point on a line chart? I've looked at the public API in the headers and can't see an obvious way. Do I need to use a marker view to achieve it?

[apurva]

I am looking for the same solution, as it could solve the highlighting issue being discussed here: #1495

Does anyone know how to get the screen co-ordinates of a selected point on a line graph?

[nicholassmith]

It seemed like it wasn't doable, I ended up using a secondary data set to show the highlighted value with a different circle.

[liuxuan30]

Check out LineChartRenderer's drawCircles() and drawHighlighted. Looks like you have to override it for now, as not many people asking this.

[apurva]

Thanks for the tip! I am guessing the secondary dataset would have only one value (the one that would be highlighted). Could you tell me how you are able to set the x position of the dataset to align with the x position of the selected item in the main graph?

[liuxuan30]

not very clear your question

[nicholassmith]

@apurva there's a delegate which is triggered when a value is selected (I'm not at my development machine so I'll post later what it is exactly). That returns a ChartDataEntry which contains the Y & X values, you create a ChartDataSet with that entry and it'll draw over the other entry.

[apurva]

@nicholassmith Thanks again! That worked for me and I am able to show a filled circle for the highlighted point.

For others reading this, the delegate methods to do this in are - chartValueSelected: & chartValueNothingSelected: