PolyDataReader

The vtkPolyDataReader aims to read legacy VTK text file but the current implementation is limited by just reading the geometry without any data field (Points/Cells/Fields).

Source

index.js
import macro from 'vtk.js/Sources/macro';
import DataAccessHelper from 'vtk.js/Sources/IO/Core/DataAccessHelper';
import vtkLegacyAsciiParser from 'vtk.js/Sources/IO/Legacy/LegacyAsciiParser';

// ----------------------------------------------------------------------------
// vtkPolyDataReader methods
// ----------------------------------------------------------------------------

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

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

// Internal method to fetch Array
function fetchData(url, option = {}) {
const { compression, progressCallback } = model;
return model.dataAccessHelper.fetchText(publicAPI, url, {
compression,
progressCallback,
});
}

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

// Remove the file in the URL
const path = url.split('/');
path.pop();
model.baseURL = path.join('/');

model.compression = option.compression;

// Fetch metadata
return publicAPI.loadData({ progressCallback: option.progressCallback });
};

// Fetch the actual data arrays
publicAPI.loadData = (option = {}) => {
const promise = fetchData(model.url, option);
promise.then(publicAPI.parseAsText);
return promise;
};

publicAPI.parseAsText = (content) => {
if (!content) {
return;
}
if (content !== model.parseData) {
publicAPI.modified();
} else {
return;
}

model.parseData = content;
model.output[0] = vtkLegacyAsciiParser.parseLegacyASCII(
model.parseData
).dataset;
};

publicAPI.requestData = (inData, outData) => {
publicAPI.parseAsText(model.parseData);
};
}

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

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

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

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

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

// vtkPolyDataReader methods
vtkPolyDataReader(publicAPI, model);

// To support destructuring
if (!model.compression) {
model.compression = null;
}
if (!model.progressCallback) {
model.progressCallback = null;
}
}

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

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

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

export default { newInstance, extend };