Plotting newbie question

[Trader.Jon]

I have read through best I can on plotting (NT7b20) and this is what I understand and what I am trying to do in a strategy:

protected override void Initialize()
{
Add(EMA(11)); // plots the moving average continuously
//
// adds a StrategyPlot indicator to paint the 'stop loss' with.
Add(StrategyPlot(0));
StrategyPlot(0).Plots[0].Pen.Color = Color.Black;
StrategyPlot(0).Plots[0].PlotStyle = PlotStyle.Square;
StrategyPlot(0).PanelUI = 1;
StrategyPlot(0).Name = "StopLoss";
} // so that is all fine

// but I only want to have plotting completed on certain conditions as:

protected override void OnBarUpdate()
{ // this condition
if (EMA(11)[0] > (EMA(5)[0] // does not
{ // plot something somehow} //have a way of plotting

// and this condition
while (EMA(11)[0] > (EMA(5)[0] // also does not
{ // plot something somehow} //have a way of plotting

}
// so what can I use in OnBarUpdate to plot on certain conditions

TIA,
Jon

[NinjaTrader_Austin]

Jon, you could use a plot, but there are also quite a few different drawing objects you could place on the chart, like squares, dots, triangles, arrows, diamonds, etc. So if you wanted to place arrows on each crossover, for example, you could do something like this:

if (CrossAbove(EMA(5), EMA(11), 1))
                DrawArrowUp("up arrow" + CurrentBar, false, 0, Low[0] - 2 * TickSize, Color.Green);
if (CrossBelow(EMA(5), EMA(11), 1))
                DrawArrowDown("down arrow" + CurrentBar, false, 0, High[0] + 2 * TickSize, Color.Red);

I actually have a script laying around that does just this.. I've attached it for your convenience.