public override void PrepareGroupStyles(PlotGroupStyleCollection externalGroups, IPlotArea layer)
{
Processed2DPlotData pdata = GetRangesAndPoints(layer);
if (null == _localGroups)
{
_localGroups = new PlotGroupStyleCollection()
{
ParentObject = this
}
}
;
using (var suspendToken = _localGroups.SuspendGetToken())
{
_localGroups.Clear();
// first add missing local group styles
_plotStyles.CollectLocalGroupStyles(externalGroups, _localGroups);
// for the newly created group styles BeginPrepare must be called
_localGroups.BeginPrepare();
// now prepare the groups
_plotStyles.PrepareGroupStyles(externalGroups, _localGroups, layer, pdata);
// for the group styles in the local group, PrepareStep and EndPrepare must be called,
_localGroups.PrepareStep();
_localGroups.EndPrepare();
suspendToken.ResumeSilently(); // we are not interested in changes in the _localGroup
}
}
public void ClearPlotItemsAndGroupStyles()
{
_plotItems.Clear();
_plotGroupStyles.Clear();
OnCollectionChanged();
}