@kitware/vtk.js/Filters/General/ImageSliceFilter.js

Visualization Toolkit for the Web

import { m as macro } from '../../macros2.js';
import vtkImageData from '../../Common/DataModel/ImageData.js';
import vtkDataArray from '../../Common/Core/DataArray.js';

const {
  vtkErrorMacro
} = macro;

// ----------------------------------------------------------------------------
// vtkImageSliceFilter methods
// ----------------------------------------------------------------------------

function vtkImageSliceFilter(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkImageSliceFilter');
  publicAPI.requestData = (inData, outData) => {
    // implement requestData
    const input = inData[0];
    if (!input) {
      vtkErrorMacro('Invalid or missing input');
      return;
    }
    const scalars = input.getPointData().getScalars();
    if (!scalars) {
      vtkErrorMacro('No scalars from input');
      return;
    }
    const datasetDefinition = input.get('extent', 'spacing', 'origin');
    datasetDefinition.extent[4] = model.sliceIndex;
    datasetDefinition.extent[5] = datasetDefinition.extent[4];
    const numberOfComponents = scalars.getNumberOfComponents();
    const sliceSize = (datasetDefinition.extent[1] - datasetDefinition.extent[0] + 1) * (datasetDefinition.extent[3] - datasetDefinition.extent[2] + 1) * numberOfComponents;
    const offset = sliceSize * model.sliceIndex;
    const sliceRawArray = scalars.getData().slice(offset, offset + sliceSize);
    const sliceArray = vtkDataArray.newInstance({
      name: scalars.getName(),
      numberOfComponents,
      values: sliceRawArray
    });
    const output = outData[0]?.initialize() || vtkImageData.newInstance();
    output.set(datasetDefinition);
    output.getPointData().setScalars(sliceArray);
    outData[0] = output;
  };
}

// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------

const DEFAULT_VALUES = {
  sliceIndex: 0
};

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

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

  // Make this a VTK object
  macro.obj(publicAPI, model);

  // Also make it an algorithm with one input and one output
  macro.algo(publicAPI, model, 1, 1);
  macro.setGet(publicAPI, model, ['sliceIndex', 'orientation']);

  // Object specific methods
  vtkImageSliceFilter(publicAPI, model);
}

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

const newInstance = macro.newInstance(extend, 'vtkImageSliceFilter');

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

var vtkImageSliceFilter$1 = {
  newInstance,
  extend
};

export { vtkImageSliceFilter$1 as default, extend, newInstance };