How should `updateDraw` be used?

[xgrg]

Hi @ivmartel , I looked for some example on how to use DrawController.updateDraw but I could not find any. I understood from the documentation that the function takes some drawing details and updates a corresponding drawing with the provided data. Therefore what I don't understand is why the following gives an error.

dc = app.getActiveLayerGroup().getActiveDrawLayer().getDrawController()
details = dc.getDrawStoreDetails()
dc.updateDraw(details)

[updateDraw] Cannot find group with id: undefined

details looks like:

{
    "88nj4fuzrvx": {
        "meta": {
            "textExpr": "{surface}",
            "quantification": {
                "width": {
                    "value": 50.72241379310344,
                    "unit": "mm"
                },
                "height": {
                    "value": 52.11206896551724,
                    "unit": "mm"
                },
                "surface": {
                    "value": 26.432499256837094,
                    "unit": "cm²"
                },
                "min": {
                    "value": 0
                },
                "max": {
                    "value": 2747
                },
                "mean": {
                    "value": 2133.9873076923077
                },
                "stdDev": {
                    "value": 891.3628205819605
                }
            }
        }
    }
}

I can't figure where the problem comes from. I am trying to load some annotations from a set of coordinates/metadata provided in a text file.

Thank you again for your valuable help. Greg

[ivmartel]

Hi, I admit the api is confusing here, the details that you want are the draw display details that you get from app.getDrawDisplayDetails(). You can find examples of it in the https://github.com/ivmartel/dwv-jqmobile project.

Side note: I'm working on https://github.com/ivmartel/dwv/issues/1020 to store annotations as DICOM SR that will change quite a lot the draw api.

[xgrg]

Thank you very much for your quick reply. I actually had tested it with:

dc = app.getActiveLayerGroup().getActiveDrawLayer().getDrawController()
details = dc.getDrawDisplayDetails()
dc.updateDraw(details)

But I am getting the same error as with getDrawStoreDetails() with the message [updateDraw] Cannot find group with id: undefined.

I am looking for a way to load vector-based annotations (namely bounding boxes and polygons - therefore Rectangle and Roi in dwv terminology) by providing their coordinates.

Any help would be highly appreciated! Thank you again.

[ivmartel]

Ah, got it, getDrawDisplayDetails returns a DrawDetails[] and udpateDraw expects a single DrawDetails.

[xgrg]

Oh! Fantastic! Thank you so much @ivmartel, it helps a lot.

[xgrg]

Just wondering, are you suggesting that moving to DICOM SR will have an impact on the support of vector-based annotations?

[ivmartel]

Yes! The problem with the current annotations is that their format is not standard and that they lack 3D information. With DICOM SR I wish to improve this and allow for easier annotation sharing with external tools.

[xgrg]

Understood. In our use case I assume we are going to keep needing the support of vector-based data. We will see how it develops then. Thank you @ivmartel!