void UpdateData()
{
// "scroll" the whole chart to the left
Array.Copy(liveData, 1, liveData, 0, liveData.Length - 1);
// place the newest data point at the end
double nextValue = ecg.GetVoltage(sw.Elapsed.TotalSeconds);
liveData[liveData.Length - 1] = nextValue;
}
private void timerUpdateData_Tick(object sender, EventArgs e)
{
double nextValue = ecg.GetVoltage(sw.Elapsed.TotalSeconds);
if (rollCheckbox.Checked)
{
// "roll" new values over old values like a traditional ECG machine
nextValueIndex = (nextValueIndex < liveData.Length - 1) ? nextValueIndex + 1 : 0;
liveData[nextValueIndex] = nextValue;
vline.IsVisible = true;
vline.X = nextValueIndex;
}
else
{
// "scroll" the whole chart to the left
Array.Copy(liveData, 1, liveData, 0, liveData.Length - 1);
liveData[liveData.Length - 1] = nextValue;
vline.IsVisible = false;
}
}