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  #1 (permalink)
Experience: Intermediate
Platform: NinjaTrader
Broker: NinjaTrader Brokerage
Trading: FDAX, NQ, HG, SI, CL
Bullywig's Avatar
Posts: 55 since Oct 2015
Thanks: 32 given, 17 received

I created a simple indicator that backpaints on the chart; I was able to add opacity control to it, but need to know how to add the parameter so it will show up when the indicator is open, and you can then adjust the opacity on a scale from 0-100? Can someone point me in the right direction. I am beginning to learn how to code, and could use some help. Thanks in advance.

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  #2 (permalink)
Urban Samurai
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forrestang's Avatar
Posts: 1,239 since Jun 2010
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At the Class level... I.e., where you add global variables, add an int for you opacity like so...

	public class NameOfIndicator: Indicator
             private int myOpacity = 50;

Here, I'm adding an arbitrary rectangle, starting 5 bars ago, to the current bar, with a height of the CURRENT bars range. This would probably be somewhere in your OnBarUpdate() block. Note I've added the opacity variable we created into the Draw.Rectangle() method.

Draw.Rectangle(this, "tag1", false, 5, Low[0], 0, High[0], Brushes.PaleGreen, Brushes.PaleGreen, myOpacity );

Finally, to turn this variable into a user input, in the parameter section below the OnBarUpdate(), we add our UserInput defintion, like so:
[Range(0, int.MaxValue)]
[Display(ResourceType = typeof(Custom.Resource), Name = "Box Opacity(0-99)", Description = "", GroupName = "Parameters", Order = 1)]
public int MyOpacity 
            get { return myOpacity ; }
            set { myOpacity = value; }
Note above, you can add a Name of whatever you want, and that will be what the user input sees(here, the user we see Box Opacity(0-99) in the user input). Note the different capitalizations of the variable name, "myOpacity."

Also of note... if you ever struggle to create these things from scratch, or struggle to find these things in the documentation... you can always create a dummy indicator, using the builder tool, create the type of user input you need... and just copy the created code into the indicator you are working on.

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