ChartObjects type checking

[traderpards]

Hey guys,

I'm having trouble confirming (or getting) the type for IChartObjects on a chart. My objective is to use OnRender() to check for a type and if it is a horizontal line, then I want to write the value of that line. For example, if that line is drawn by using F6 at 1150 on a TF chart, then I want to write "1150.0" for reference on that chart, just over that horizontal line.

I'm sure I can do that using RenderObject but I can't get to the point where I can even call RenderObject.

Consider the code:

	foreach (Gui.NinjaScript.IChartObject c in myObjects)
	{
                if( c.Name ==  "Horizontal Line" ) 
		{
                    NinjaTrader.NinjaScript.DrawingTools.HorizontalLine chl = c as NinjaTrader.NinjaScript.DrawingTools.HorizontalLine;
		}
	}

My problem is chl ends up being null so I can't use anything for the c chart object that the visual Studio debugger has no problem seeing.

And if I check like this, which I'd rather do than the above, I never get into the code where I can use the values for "c":

	foreach (Gui.NinjaScript.IChartObject c in myObjects)
	{
                if( c is HorizontalLine ) 
		{
                    NinjaTrader.NinjaScript.DrawingTools.HorizontalLine chl = (c as NinjaTrader.NinjaScript.DrawingTools.HorizontalLine);
		}
	}

I never get past "c is HorizontalLine" as though c isn't of type HorizontalLine. Well, yes it is of type HorizontalLine! I can clearly see that "c" is a HorizontalLine when I step through it in the debugger and I can see all its objects so there must be something I'm not doing correctly but I'm at a loss as to what.

Can you help?

[-=Edge=-]

Can you help?

Take a look at post #5 for an example of just what your looking for..

http://ninjatrader.com/support/forum/showthread.php?t=79764

[traderpards]

Thanks Edge!

I'll probably use what you suggest but I'd still like to know why what I'm doing doesn't work though... Because I got what I'm doing from Ninjatrader's support documentation and it should work, it seems to me.

http://ninjatrader.com/support/helpGuides/nt8/en-us/?welcome_to_ninjatrader.htm

Would you happen to know why?

[traderpards]

Apparently, this code does work but only if you just drew the line. The HorizontalLine object is null if the user drawn line already exists.

I don't believe that should be... the code:

if( c is HorizontalLine )

should return true if c is a HorizontalLine regardless of whether the user just drew it or if it already exists and the code:

NinjaTrader.NinjaScript.DrawingTools.HorizontalLine chl = (c as NinjaTrader.NinjaScript.DrawingTools.HorizontalLine);

should return a valid object if that's what the object in the DrawObjects array actually is.

Right??

[-=Edge=-]

Right??

Right.. If you read that thread in it's entirety, you'll notice there is currently a problem with finding those objects that were previously drawn before a re-compile and reload of ninjascript.. Towards the end of the thread Dave mentions this has now been fixed and will no longer be an issue in the next beta...

[traderpards]

Ha!!! Thanks then Edge!