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Placing Indicator Properties onto Strategy Properties Automagically
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Created: by zr6bcm Attachments:6

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Placing Indicator Properties onto Strategy Properties Automagically

  #1 (permalink)
Elite Member
Heidelberg, Germany
 
Futures Experience: Intermediate
Platform: NinjaTrader
Favorite Futures: Stocks
 
Posts: 11 since Jun 2014
Thanks: 6 given, 12 received

Placing Indicator Properties onto Strategy Properties Automagically

The attached example shows how to automagically place indicator properties onto the property tab of the strategy. See attached images as well.

What the code shows is:
1. How to have indicator properties automatically on strategy properties
2. How to delete properties not required at that moment
3. How to update property names
4. How to update property descriptions

Comment: The last three aspects comes from the work discussed in this thread:
https://futures.io/ninjatrader-programming/2811-dynamic-properties-new-post.html

See following posts for more detail on how to use this and the situation within optimizer.

Fair warning: (a) this code is NOT for the faint of heart and (b) it works excellently, but still it is not what NinjaTrader developers might want you to do.

Attached Thumbnails
Placing Indicator Properties onto Strategy Properties Automagically-properties-chart.jpg   Placing Indicator Properties onto Strategy Properties Automagically-chart.jpg   Placing Indicator Properties onto Strategy Properties Automagically-properties-backtest.jpg   Placing Indicator Properties onto Strategy Properties Automagically-properties-optimizer.jpg   Placing Indicator Properties onto Strategy Properties Automagically-source-example.jpg  
Attached Files
Register to download File Type: cs ExampleDynamicProperties.cs (17.1 KB, 16 views)
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  #2 (permalink)
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  #3 (permalink)
Elite Member
Heidelberg, Germany
 
Futures Experience: Intermediate
Platform: NinjaTrader
Favorite Futures: Stocks
 
Posts: 11 since Jun 2014
Thanks: 6 given, 12 received


If you only wish to reflect the indicator properties onto your strategy, these are the key things that needs to be done in your strategy. See complete example attached to the first post for reference.

Add the ICustomTypeDescriptor interface onto your class, predefine your indicators so that they are class members and write a class constructor to "register" these indicators:
 
Code
  public class YourStrategy :	Strategy, ICustomTypeDescriptor
  {
    SMA  sma;
    MACD macd;

    public YourStrategy()
    {
      extraIndicators["SMA Filter"]   = sma  = SMA(200);
      extraIndicators["MACD Trigger"] = macd = MACD(12,26,9);
    }

In your initialize method, just Add these indicators as you normally do:
 
Code
  protected override void Initialize()
  {
    Add(sma);
    Add(macd);
  }

Add this empty method and cut-and-paste the "black magic" into your code:
 
Code
  private void ModifyProperties(PropertyDescriptor[] properties)
  {
  }

  #region Cut-And-Paste Boiler Plate Code
  ....
  #endregion
Have a coffee.

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  #4 (permalink)
Elite Member
Heidelberg, Germany
 
Futures Experience: Intermediate
Platform: NinjaTrader
Favorite Futures: Stocks
 
Posts: 11 since Jun 2014
Thanks: 6 given, 12 received

If you want to modify properties on the fly, the follow all the instructions above to get the code into your strategy. Thereafter, implement your logic into the method ModifyProperties.

The first is to delete properties which are not relevant at this moment. For example, if you set one property to say do only something simple, then you can dynamically remove the complex properties. It would look like this:
 
Code
  if (simpleMode)
    PropertyDelete(properties, "NameOfComplexProperty");

You can also change the name of the property. For example, in the optimizer, it happens sometimes that I need to know the range of values for a specific property. With this approach, I make the range as part of the property name. (The second example is easier achieved by statically setting the Gui.Design.DisplayName attribute.)
 
Code
  PropertyUpdateDisplayName(properties, "PropertyWithLimitedRange", "Property [0 --> 3]");
  PropertyUpdateDisplayName(properties, "PropertyDirection", "Direction [-1==short, +1==long]");

Similarly, you could update the property description to contain additional dynamic content:
 
Code
  PropertyUpdateDescription(properties, "PropertyWithUpdatedDescription", "Max value today is 7!");

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  #5 (permalink)
Elite Member
Heidelberg, Germany
 
Futures Experience: Intermediate
Platform: NinjaTrader
Favorite Futures: Stocks
 
Posts: 11 since Jun 2014
Thanks: 6 given, 12 received

OPTIMIZER: (The good, the bad and the UGLY)

What still does not work, is to have NinjaTrader step the indicator properties through a range. For the live of me, and after a few zillion hours of mucking around, I still don't understand when NinjaTrader decides that specific properties should have a range attached and when not.

I suspect that this part of the puzzle can only be resolved by having access to that piece of source code from the optimizer. As such, maybe on a rainy day, a developer from NT might give us the hint required.

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