Get data from rectangle

[federicoo]

Hello,

I need to get data from a rectangle that is drawn by an indicator in chart.

I need to get the data as this appear in drawing objects (see attached screenshot): color, start time, start Y, end time, end Y and then assign these values to respective variables to process later in the logic of the strategy.

Could I see the code to do this?

Thanks in advance

[NinjaTrader_Jesse]

Hello federicoo,

Thank you for the post.

We have an example of working with the drawing objects in the following page: https://ninjatrader.com/support/help...ub=drawobjects

Keep in mind this only works in realtime and if other indicators are drawing the objects they may not load in the same order meaning that if your script loads before the other indicator it may not see the objects initially. This should generally be able to be used going forward in time in realtime after the scripts have loaded.


I look forward to being of further assistance.

[federicoo]

It is not working, may be the type of drawing is not a rectangle... how can I retrieve the type of drawing made by the indicator?

Thanks

[NinjaTrader_Jesse]

Hello federicoo,

The samples in the page I linked show how to do that, what did you try that is not working?

You mentioned maybe the object is not a rectangle, what kind of object is being drawn? If you open the Right click menu -> Drawing Tools -> Drawing objects menu does it appear?

I look forward to being of further assistance.

[federicoo]

Hello federicoo,

The samples in the page I linked show how to do that, what did you try that is not working?

You mentioned maybe the object is not a rectangle, what kind of object is being drawn? If you open the Right click menu -> Drawing Tools -> Drawing objects menu does it appear?

I look forward to being of further assistance.

I did that, it is the screenshot attached, after Right click menu -> Drawing Tools -> Drawing objects...

[NinjaTrader_Jesse]

Hello federicoo,

Thank you for the post.

It looks like the object is present and appears to be a rectangle, what did you try that is not working?


I look forward to being of further assistance.

[federicoo]

Thank you Jesse, but it seem like this third-party indicator is hiding the rectangle data, so I can not get the anchor values from these rectangles.

[NinjaTrader_Jesse]

Hello federicoo,

I am not sure what you mean, if you can access the drawing object you should be able to access its anchors. Are you having trouble accessing the rectangle or the anchors of the rectangle in code? Can you provide a sample of what you tried so we can get a better idea of the problem?

I look forward to being of further assistance.

[federicoo]

I had been testing a code by Paul on this thread

https://ninjatrader.com/support/forum/forum/ninjatrader-8/indicator-development/1053703-how-i-can-get-rectangle-coordinates

But not success with that TPO indicator... so, I don't know if there is a solution to this.

Thanks

[NinjaTrader_Jesse]

Hello federicoo,

I couldn't really say without seeing what you actually coded. The other post is not necessarily helpful because that only shows what they had used but does not tell me what you coded. If you can attach a sample of what you are trying specifically that will help to make sure you are using the right code to know what to check next.

The image you provided shows the drawing object in the collection so if you have the script applied to that chart and have let it run in Realtime it should be able to see it. Have you tried using a Print in the drawing object loop from the help guide?

 foreach (DrawingTool draw in DrawObjects.ToList())
  {
    Print(draw.ToString());
}

The image you provided also does not show where your indicator is applied, if you have this in a different chart it won't see that object.

Please let me know if I may be of further assistance.

[federicoo]

Hello Jesse,

This is the code:

================================================== ===========================
protected override void OnBarUpdate()
{
//************************************************** ****
// BLOCK 1

foreach (DrawingTool draw in DrawObjects.ToList())
{
Print(draw.ToString());
}

//************************************************** ****

//************************************************** ****
// BLOCK 2

foreach (DrawingTool draw in DrawObjects.ToList()) // Go through objects
{
if (draw is DrawingTools.Rectangle) // test to find rectangle
{
Print ("Tag name: "+draw.Tag); // priint tag name
DrawingTools.Rectangle temp = draw as DrawingTools.Rectangle; // create copy to get anchorpoints

Print("startY: " + temp.StartAnchor.Price);
Print("startX: " + temp.StartAnchor.Time);

Print("endY: " + temp.EndAnchor.Price);
Print("endX: " + temp.EndAnchor.Time);
}
}

//************************************************** ****

}
================================================== ===============================================

BLOCK 1 works perfectly, this identifies the rectangle as what this is really (see output attached).

BLOCK 2: does not work... it would identify the rectangle and get the anchors from this... the if statement si never true so it doesn't find the rectangle that, curiously, is finding in BLOCK 1...

I can't get a logic explanation to this issue.

Thanks

[NinjaTrader_Jesse]

Hello federicoo,

Please try using the syntax shown in the following sample for the Block 2 portion of your code: https://ninjatrader.com/support/help...considerations

Rather than casting the type to a rectangle try checking its type by using a string representation:

foreach (dynamic obj in DrawObjects.ToList())
{
  if (obj.ToString().Equals("NinjaTrader.NinjaScript.DrawingTools.Rectangle"))
  {
      // Access the object by assuming that it is the Type we expect
      Print(String.Format("rect {0} detected!", obj.Tag));
  }
}

Does this allow for your condition to continue?

I look forward to being of further assistance.

[federicoo]

wow! I have to say that it was wonderful! hehehe... Thank you very much, it solve the problem and I can get the anchors from rectangle finally!

The final code is the following:

protected override void OnBarUpdate()
{
//************************************************** ****
// BLOCK 1

foreach (DrawingTool draw in DrawObjects.ToList())
{
Print(draw.ToString());
}

//************************************************** ****

//************************************************** ****
// BLOCK 2

foreach (DrawingTool draw in DrawObjects.ToList()) // Go through objects
{
if (draw is DrawingTools.Rectangle) // test to find rectangle
{
Print ("Tag name: "+draw.Tag); // priint tag name
DrawingTools.Rectangle temp = draw as DrawingTools.Rectangle; // create copy to get anchorpoints

Print("startY: " + temp.StartAnchor.Price);
Print("startX: " + temp.StartAnchor.Time);

Print("endY: " + temp.EndAnchor.Price);
Print("endX: " + temp.EndAnchor.Time);
}
}

//************************************************** ****

//************************************************** ****
// BLOCK 3
foreach (dynamic obj in DrawObjects.ToList())
{
if (obj.ToString().Equals("NinjaTrader.NinjaScript.Dr awingTools.Rectangle"))
{
// Access the object by assuming that it is the Type we expect
Print(String.Format("rect {0} detected!", obj.Tag));
Print("startY: " + obj.StartAnchor.Price);
Print("startX: " + obj.StartAnchor.Time);

Print("endY: " + obj.EndAnchor.Price);
Print("endX: " + obj.EndAnchor.Time);
}
}
//************************************************** ****

}

And the output attached.

THANK YOU Jesse

[NinjaTrader_Jesse]

Hello federicoo,

I am glad that worked. Just to clarify here, it seems like the item you are using is likely loaded from an assembly which is why using dynamic would be needed here. The type you are trying to access exists in a different assembly so that is why the direct cast was unable to match the object by type.


Please let me know if I may be of additional assistance.