@kitware/vtk.js/IO/Misc/JSONNucleoReader.js

Visualization Toolkit for the Web

import { m as macro } from '../../macros2.js';
import vtkPolyData from '../../Common/DataModel/PolyData.js';
import DataAccessHelper from '../Core/DataAccessHelper.js';
import '../Core/DataAccessHelper/LiteHttpDataAccessHelper.js';

// import 'vtk.js/Sources/IO/Core/DataAccessHelper/HttpDataAccessHelper'; // HTTP + gz
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/HtmlDataAccessHelper'; // html + base64 + zip
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/JSZipDataAccessHelper'; // zip

// ----------------------------------------------------------------------------
// vtkElevationReader methods
// ----------------------------------------------------------------------------

function vtkJSONNucleoReader(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkJSONNucleoReader');

  // Create default dataAccessHelper if not available
  if (!model.dataAccessHelper) {
    model.dataAccessHelper = DataAccessHelper.get('http');
  }

  // Internal method to fetch Array
  function fetchText(url, options) {
    return model.dataAccessHelper.fetchText(publicAPI, url, options);
  }

  // Set DataSet url
  publicAPI.setUrl = (url, options) => {
    model.url = url;

    // Fetch metadata
    return publicAPI.loadData(options);
  };

  // Fetch the actual data arrays
  publicAPI.loadData = options => fetchText(model.url, options).then(csv => {
    publicAPI.parseAsText(csv);
    return true;
  });
  publicAPI.parseAsText = jsonAsTxt => {
    const {
      vertices,
      indices
    } = JSON.parse(jsonAsTxt);
    const nbIndices = indices.length;
    const nbTriangles = nbIndices / 3;
    const nbCellsValues = nbTriangles + nbIndices;
    model.points = Float32Array.from(vertices);
    model.polys = nbCellsValues < 65535 ? new Uint16Array(nbCellsValues) : new Uint32Array(nbCellsValues);
    let srcOffset = 0;
    let destOffset = 0;
    while (destOffset < model.polys.length) {
      model.polys[destOffset++] = 3;
      model.polys[destOffset++] = indices[srcOffset++];
      model.polys[destOffset++] = indices[srcOffset++];
      model.polys[destOffset++] = indices[srcOffset++];
    }
    publicAPI.modified();
  };
  publicAPI.requestData = (inData, outData) => {
    const polydata = vtkPolyData.newInstance();
    polydata.getPoints().setData(model.points, 3);
    polydata.getPolys().setData(model.polys);
    model.output[0] = polydata;
  };
}

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

const DEFAULT_VALUES = {
  // dataAccessHelper: null,
  // url: null,
};

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

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

  // Build VTK API
  macro.obj(publicAPI, model);
  macro.get(publicAPI, model, ['url']);
  macro.setGet(publicAPI, model, ['dataAccessHelper']);
  macro.algo(publicAPI, model, 0, 1);

  // Object methods
  vtkJSONNucleoReader(publicAPI, model);
}

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

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

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

var vtkJSONNucleoReader$1 = {
  newInstance,
  extend
};

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