private void OnRepeatTimer(object sender, EventArgs e)
{
int current = _drawTB.ViewDrawTrackBar.Value;
if (current != _targetValue)
{
if (current < _targetValue)
_drawTB.ViewDrawTrackBar.ScrollValue = Math.Min(_targetValue, current + _drawTB.ViewDrawTrackBar.LargeChange);
else
_drawTB.ViewDrawTrackBar.ScrollValue = Math.Max(_targetValue, current - _drawTB.ViewDrawTrackBar.LargeChange);
}
}