Real time line chart

[yuchuqiao]

hi,

Anyone successfully implement a realtime line chart ? Some example to give ? I tried several ways, like: call notifyDatasetChanged() and reloadInputViews. But that makes the chart completely messed up.

Thanks.

[danielgindi]

You mean for adding data in realtime?

[knseir]

Hi Daniel, glad I found this issue.
I'm also trying to add data in realtime. I have a heart rate monitor that sends a heart rate at irregular intervals. every time it does, I call a function that ends with :

        chart.notifyDataSetChanged()

Only the chart doesn't change until it gets about 5-7 new datapoint

I know they're not all coming together because I can see them on the console.
I get point 1, 2, 3, ... 7 THEN the chart changes

is there something similar to chart.invalidate ?

[knseir]

UPDATE:

it turns out that the graph was updated automatically. I notices this when I swiped to the right and it showed the new values. However, I had to keep swiping to see them

even

    chart.setVisibleXRangeMaximum(20)
    chart.moveViewToX(data!.xValCount - 21)

did not move the graph to the new points

[sunjames]

Ios - charts can mix after release

[knseir]

Hi sunjames, I'm sorry, I don't understand
'charts can mix after release' ?

[danielgindi]

the moveViewToX function was fixed, so you should be able to control it in whatever way you like now.