Unable to Implement imageCrop Filter

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1

I’m trying to implement ImageCrop filter on my volume file. I have downloaded the vtk.js examples and able to run ImageCropFilter example. I tried implementing same separately but getting error in the very first step i.e. during instantiation of the ImageCropFilter. I have attached screenshot for reference and the code file as well. I also tried the exactly same code from example in new project but still getting same error. Any idea what am I doing wrong.

ImageCropFilter Error
ImageCropFilter Error724×162 27.8 KB

ImageCropFilter.js (4.9 KB)

2

Hi,

The following PR should fix it:

Hth,
Julien.

3

Hi @finetjul,
During the instantiation, I tried passing one array for croppingPlanes but even then getting the same error.

4

Are you sure you applied my PR (not yet merged) onto your VTK.JS codebase ?

I can modify the example as such and it works:

const cropFilter = vtkImageCropFilter.newInstance({
  croppingPlanes: [0, 1, 0, 1, 0, 1],
});
5

I did following in my code example. As It was saying in error that no initial values was there.

const cropFilter = vtkImageCropFilter.newInstance(myData.getExtent());

6

I have tried implementing ImageCropFilter with latest 21.1.3 version. But still facing same issue. Do I need to update something else too if anyone can suggest.

7

In my custom extension to the cropping widget I have the following:

index.js:

function vtkCropWidget(publicAPI, model) {
  model.classHierarchy.push('vtkCropWidget');

  // --- Widget Requirement ---------------------------------------------------
  model.behavior = macro.chain(model.behavior, behavior);

  model.methodsToLink = model.methodsToLink || [];
  model.methodsToLink.push('handleScale');

  publicAPI.setFaceHandlesEnabled(false);
  publicAPI.setEdgeHandlesEnabled(false);

  publicAPI.getRepresentationsForViewType = getRepresentationsForViewType;

  publicAPI.setSlices = (slices) => {
    customState.setSlices(slices);
  };
}

// ----------------------------------------------------------------------------

const DEFAULT_VALUES = {};

// ----------------------------------------------------------------------------

export function extend(publicAPI, model, initialValues = {}) {
  Object.assign(model, DEFAULT_VALUES, initialValues);

  vtkImageCroppingWidget.extend(publicAPI, model, initialValues);

  vtkCropWidget(publicAPI, model);
}

// ----------------------------------------------------------------------------

export const newInstance = macro.newInstance(extend, 'vtkCropWidget');

// ----------------------------------------------------------------------------

export default { newInstance, extend };

const croppingWidget = vtkCroppingWidget.newInstance();
      this.croppingWidgetProxy = new WidgetProxy(
        'croppingWidget',
        croppingWidget,
        this.$store
      );

      this.$store.commit('vtkstore/addWidgetProxy', {
        widgetProxy: this.croppingWidgetProxy,
      });

      // The actual cropping logic for the vtkVolume
      const mapper = this.volume.getMapper();
      croppingWidget.copyImageDataDescription(image);
      const cropState = croppingWidget.getWidgetState().getCroppingPlanes();
      cropState.onModified(() => {
        // Force render to sync all views
        this.viewArray.forEach((v) => v.renderLater());

        const [planes, newBounds] = this.createNewCroppingPlanes(
          image,
          cropState.getPlanes()
        );

        this.notifyBoundsChange(cropState.getPlanes());
        mapper.removeAllClippingPlanes();
        planes.forEach((plane) => {
          mapper.addClippingPlane(plane);
        });
        mapper.modified();
      });
      cropState.setPlanes(intialBounds); // Initial bounds

Follwing the example code on: vtk.js

1 Like
8

Thanks @emil-peter. Will try it out separately as my implementation is not using widgets. I implemented image cropping in my code similar to API. But later switched to the 20.4.1 version of VTK.JS just to leverage the existing framework functionality. Expecting the issue will be soon resolved in newer releases.