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Shorter vertical line with DrawLine


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Shorter vertical line with DrawLine

  #1 (permalink)
 Randwulf 
Colorado Springs, CO
 
Experience: Beginner
Platform: NinjaTrader
Posts: 22 since Oct 2009
Thanks Given: 16
Thanks Received: 0

I'm currently using DrawRegion() from the top to the bottom of a Keltner Channel to highlight a bar.
I like this approach except for the fact that it offsets by half a bar.

I could be just as happy with a vertical line that runs from top to bottom of the channel but,
I can't seem to get DrawLine() to work...
At present, if the bool for autoscale is "false", the lines don't show and if "true", they do show but, run considerably higher and lower than the channel.

Example:
protected override void OnBarUpdate()
{
// Condition set 1
if (High[0] > KeltnerChannel(4, 50).Midline[0]
&& Low[0] < KeltnerChannel(4, 50).Midline[0])
{
DrawLine("My line" + CurrentBar, false, 0, KeltnerChannel(4, 50).Upper[0], 0, KeltnerChannel(4, 50).Lower[0] , Color.White, DashStyle.Solid, 2);
}
}

Here's the point where you smile and shake your head...
Go ahead, please show me the error of my ways...

Thanks in advance

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  #3 (permalink)
 
anachronist's Avatar
 anachronist 
San Jose, CA
 
Experience: Advanced
Platform: NinjaTrader
Trading: all
Posts: 27 since Apr 2012
Thanks Given: 0
Thanks Received: 16


Regarding your statement:
DrawLine("My line" + CurrentBar, false, 0, KeltnerChannel(4, 50).Upper[0], 0, KeltnerChannel(4, 50).Lower[0] , Color.White, DashStyle.Solid, 2);

I don't know if this will fix your problem, but I'd do a couple things differently.

1. The line ID "My line"+CurrentBar should be "My line" + CurrentBar.ToString().

2. You are needlessly recalculating the KeltnerChannel multiple times. To avoid this, here's what I do (and it becomes critical to speed up very complex code).

In variables, declare
 
Code
                            
private KeltnerChannel kc
Add an OnStartUp() to initialize kc (don't put this in Initialize()):
 
Code
                            
protected override void OnStartUp() {
   
kc KelternChannel(450);

Then in OnBarUpdate() do this:
 
Code
                            
protected override void OnBarUpdate() {
   
double k kc[0]; // calculate KeltnerChannel ONCE
   // now access all the properties you want
   
DrawLine("Myline"+CurrentBar.ToString(), false0kc.Upper[0], 0kc.Lower[0] , Color.WhiteDashStyle.Solid2);

-Alex

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  #4 (permalink)
 Randwulf 
Colorado Springs, CO
 
Experience: Beginner
Platform: NinjaTrader
Posts: 22 since Oct 2009
Thanks Given: 16
Thanks Received: 0

anachronist,

Thank you for the response.
I wanted to let you know that I appreciate it but, can't validate it just yet.
I am in the process of re-imaging windows and reloading NinjaTrader as NT support can't duplicate the issue.
I especially appreciate the speed up suggestions & will follow up ASAP..

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Last Updated on May 3, 2012


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