Draw.Region function question.

[Plaket]

Hi,

I am trying to create a very simple indicator. It is compose of two SMAs (one short and on long). I need to color the region between these two SMAs depending on the trend of the SMAs.

If the short SMA is > than the long SMA I want to color the region using a specific color. And if the short SMA is < than the long SMA I want to change the color of the region.

I have tried the next code without success:

protected override void OnBarUpdate()
{
if(CurrentBar < 50) return;

SMAShort[0] = SMA(10)[0];
SMALong[0] = SMA(50)[0];

if (SMA(10)[0] > SMA(50)[0])
Draw.Region(this, "tag1", CurrentBar, 0, ExampleDrawRegionSMAs().SMAShort, ExampleDrawRegionSMAs().SMALong, null, Brushes.Blue, 50);
else
Draw.Region(this, "tag2", CurrentBar, 0, ExampleDrawRegionSMAs().SMAShort, ExampleDrawRegionSMAs().SMALong, null, Brushes.Red, 50);

}

The region has always the same color.

Could you tell me please, how to do this?

Thank you in advance.

[NinjaTrader_ChrisL]

Hi Plaket, thanks for your note.

The parameters take a StarBarsAgo and an EndBarsAgo parameter, right now your code is set up to color all of the bars on the chart. You would need to find where the downtrend starts and draw the region from that starting point to the current bar. There are examples that use the OnRender method to do this as well, see this example from our colleague Jim:

https://ninjatraderecosystem.com/user-app-share-download/ichimokucloud-2/

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[Plaket]

Thanks ChrisL,

Unfortunately the code of that indicator is not simple. Please, do you have an easier example to accomplish this simple thing? Something for a new person at NinjaSciprt? Any help would be very welcome.

Thanks

[NinjaTrader_ChrisL]

Hi Plaket, thanks for your reply.

OnRender is used in this case because making multiple Draw.Region calls will cause performance problems in large workspaces. If Draw.Region is to be used the easiest way of highlighting a region a certain color would be to color only the current and second from current bars.

e.g.

protected override void OnBarUpdate()
        {
            if(CurrentBar < 1)
                return; 

            if (SMA(10)[0] > SMA(50)[0])
            {
                Draw.Region(this, "tag1" + CurrentBar, 1, 0, Bollinger(2, 14).Upper, Bollinger(2, 14).Lower, null, Brushes.Red, 50);
            }
            else
            {
                Draw.Region(this, "tag1" + CurrentBar, 1, 0, Bollinger(2, 14).Upper, Bollinger(2, 14).Lower, null, Brushes.Green, 50);
            }
        }