Does current bar touch or cross my trendline?

[shildebrand324]

I'm currently writing a ninjascript strategy and need the ability to see if the current bar is touching or crossed a manually drawn trend channel line. Is this possible?

[NinjaTrader_ChelseaB]

Hello shildebrand324,

Welcome the NinjaTrader forums!

This would require projecting the y intercept along a slope, and is possible.

Below is a link to an example.

https://ninjatrader.com/support/forum/forum/ninjatrader-8/add-on-development/107312-price-crossing-a-line?p=828663#post828663

[shildebrand324]

So, I'll need to loop through all the trendlines on the chart and determine if the current bar is using one of them?

[NinjaTrader_ChelseaB]

Hello shildebrand324,

That is correct. (Unless the script draws the line with Draw.Line() and the draw object is saved to a variable.)

[shildebrand324]

I guess I'm a little confused with the example. It appears to be drawing a line then looking five bars back. Do you have any example of looping through drawn objects and finding it's projection?

[NinjaTrader_ChelseaB]

Hello shildebrand324,

If you are wanting to loop through manually drawing objects this will be in the DrawObjects collection.

There is sample code in the help guide.

https://ninjatrader.com/support/helpGuides/nt8/drawingtools_drawobjects.htm

And links to a few other forum posts.

https://ninjatrader.com/es/support/forum/forum/ninjatrader-8/strategy-development/1090292-get-strategy-to-get-the-ray-price-of-the-current-bar?p=1090901#post1090901

https://ninjatrader.com/pt/support/forum/forum/ninjatrader-8/indicator-development/1108078-looping-through-drawobjects-shown-in-guide-doesn-t-work?p=1108793#post1108793

https://ninjatrader.com/support/forum/forum/ninjatrader-8/strategy-development/1042114-update-position-of-manual-drawing?p=1042310#post1042310

Once you have the object the code would be similar to what is shown in the example linked in post #2.

[shildebrand324]

I've got the looping part down, but don't I need to get the start/end anchors for both sides of the trendchannel?

foreach (DrawingTool draw in DrawObjects)
{
if (draw is DrawingTools.TrendChannel)
{

}
}

[NinjaTrader_ChelseaB]

Hello shildebrand324,

Yes, cast as the desired object (as the example in the help guide shows with a line) and the drawing object will have anchors.

The TrendChannel will have 4 anchors as listed in the help guide.

https://ninjatrader.com/support/helpGuides/nt8/trendchannel.htm

[shildebrand324]

ParallelEndAnchor doesn't appear to be a property as the guide states? ParallelStartAnchor is there.

[NinjaTrader_ChelseaB]

Hello shildebrand324,

Is the draw object casted as a TrendChannel?

(draw as TrendChannel).ParallelStartAnchor

[shildebrand324]

Yes, but ParallelEndAnchor isn't available.

foreach (DrawingTool draw in DrawObjects)
{
if (draw is DrawingTools.TrendChannel)
{
TrendChannel channel = draw as DrawingTools.TrendChannel;
Print("Tag: " + draw.Tag + " Start Price: " + channel.TrendStartAnchor.Price + " End Price " + channel.TrendEndAnchor.Price);
Print("Tag: " + draw.Tag + " Parallel Start Price: " + channel.ParallelStartAnchor.Price + " End Price " );
}
}

[NinjaTrader_ChelseaB]

Hello shildebrand324,

Took a look around the forums and found I've come across this before, and you are correct there is no ParallelStartAnchor.

https://ninjatrader.com/support/forum/forum/ninjatrader-8/indicator-development/104431-exploring-trendchannel-values-per-each-parallel-line?p=812145#post812145

https://ninjatrader.com/support/forum/forum/ninjatrader-8/indicator-development/104431-exploring-trendchannel-values-per-each-parallel-line?p=829789#post829789

[shildebrand324]

I'm not sure those posts help, don't I need to calculate the parallelEndAnchor price?

[shildebrand324]

Ultimately, what values from the trend channel help me project the y intercept?

[shildebrand324]

So, did some digging and figured out how to calculate the parallelEndAnchor price

double parallelEndAnchorPrice = channel.ParallelStartAnchor.Price + (channel.TrendEndAnchor.Price - channel.TrendStartAnchor.Price);

Now if I can get some help plugging in the values for projecty, I'll be golden.

// First calculate slope of line
double runrate = (x2 - x1) / 5;

// Now project the slope to new bar
double projecty = runrate * (CurrentBar - y1bbar);