private void ScheduleUtmUpdate(PlanPoint p)
{
if (p.dt == null)
{
p.dt = new DispatcherTimer(OneSecond, DispatcherPriority.Background, UtmUpdate, this.Dispatcher);
p.dt.Tag = p;
p.dt.Start();
}
else
{
p.dt.Stop();
p.dt.Start();
}
}
void DrawPlanPoint(DrawingContext dc, PlanPoint pp)
{
// AB is the pctg point, XY is the local Coordinates
FormattedText ft;
Point tp, p = Pct2CanvasPoint(pp.Pct);
dc.DrawEllipse(AlignPointBrush, null, p, markerRadius, markerRadius);
ft = new FormattedText($"{pp.PointName}", Thread.CurrentThread.CurrentUICulture,
FlowDirection.LeftToRight, Typeface, NpEmSize, Foreground);
tp = new Point(p.X - (ft.Width / 2), p.Y + (markerRadius / 2) + 1);
dc.DrawText(ft, tp);
}