private void MenuItem_Click_Invert(object sender, RoutedEventArgs e)
{
MenuItem mi = (MenuItem)sender;
ObservableCollection <RenderSlice> rslist = (ObservableCollection <RenderSlice>)mi.DataContext;
IEnumerable <RenderSlice> selectedrs = this.GetSelectedRenderSlices(rslist);
foreach (RenderSlice rs in selectedrs)
{
// Inverst the scaling factor and calculate new range
rs.Scale = -rs.Scale;
float min = -rs.Offset;
float max = (float)rs.Range - rs.Offset;
// Update range and offset.
rs.Zoominfo.PhysicalMax = max > min ? max : min;
rs.Zoominfo.PhysicalMin = max > min ? min : max;
rs.Offset = -max;
}
// Draw inversted signal
RendererManager.UpdateRenderers(RendererManager.GetInvolvedRenderers(selectedrs));
}