@kitware/vtk.js/Rendering/Core/Follower.js

Visualization Toolkit for the Web

import _toConsumableArray from '@babel/runtime/helpers/toConsumableArray';
import _defineProperty from '@babel/runtime/helpers/defineProperty';
import { mat4, vec3 } from 'gl-matrix';
import macro from '../../macros.js';
import vtkActor from './Actor.js';

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); enumerableOnly && (symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; })), keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = null != arguments[i] ? arguments[i] : {}; i % 2 ? ownKeys(Object(source), !0).forEach(function (key) { _defineProperty(target, key, source[key]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } return target; }
// vtkFollower methods
// ----------------------------------------------------------------------------

function vtkFollower(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkFollower'); // Capture 'parentClass' api for internal use

  var superClass = _objectSpread({}, publicAPI);

  publicAPI.getMTime = function () {
    var mt = superClass.getMTime();

    if (model.camera !== null) {
      var time = model.camera.getMTime();
      mt = time > mt ? time : mt;
    }

    return mt;
  };

  publicAPI.computeMatrix = function () {
    // check whether or not need to rebuild the matrix
    if (publicAPI.getMTime() > model.matrixMTime.getMTime()) {
      mat4.identity(model.matrix);

      if (model.userMatrix) {
        mat4.multiply(model.matrix, model.matrix, model.userMatrix);
      }

      mat4.translate(model.matrix, model.matrix, model.origin);
      mat4.translate(model.matrix, model.matrix, model.position);
      mat4.multiply(model.matrix, model.matrix, model.rotation);
      mat4.scale(model.matrix, model.matrix, model.scale);

      if (model.camera) {
        // first compute our target viewUp
        var vup = new Float64Array(model.viewUp);

        if (!model.useViewUp) {
          vec3.set.apply(vec3, [vup].concat(_toConsumableArray(model.camera.getViewUp())));
        } // compute a vpn


        var vpn = new Float64Array(3);

        if (model.camera.getParallelProjection()) {
          vec3.set(vpn, model.camera.getViewPlaneNormal());
        } else {
          vec3.set.apply(vec3, [vpn].concat(_toConsumableArray(model.position)));
          vec3.subtract(vpn, model.camera.getPosition(), vpn);
          vec3.normalize(vpn, vpn);
        } // compute vright


        var vright = new Float64Array(3);
        vec3.cross(vright, vup, vpn);
        vec3.normalize(vright, vright); // now recompute the vpn so that it is orthogonal to vup

        vec3.cross(vpn, vright, vup);
        vec3.normalize(vpn, vpn);
        model.followerMatrix[0] = vright[0];
        model.followerMatrix[1] = vright[1];
        model.followerMatrix[2] = vright[2];
        model.followerMatrix[4] = vup[0];
        model.followerMatrix[5] = vup[1];
        model.followerMatrix[6] = vup[2];
        model.followerMatrix[8] = vpn[0];
        model.followerMatrix[9] = vpn[1];
        model.followerMatrix[10] = vpn[2];
        mat4.multiply(model.matrix, model.matrix, model.followerMatrix);
      }

      mat4.translate(model.matrix, model.matrix, [-model.origin[0], -model.origin[1], -model.origin[2]]);
      mat4.transpose(model.matrix, model.matrix); // check for identity

      model.isIdentity = false;
      model.matrixMTime.modified();
    }
  };
} // ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------


var DEFAULT_VALUES = {
  viewUp: [0, 1, 0],
  useViewUp: false,
  camera: null
}; // ----------------------------------------------------------------------------

function extend(publicAPI, model) {
  var initialValues = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  Object.assign(model, DEFAULT_VALUES, initialValues); // Inheritance

  vtkActor.extend(publicAPI, model, initialValues);
  model.followerMatrix = mat4.identity(new Float64Array(16)); // Build VTK API

  macro.setGet(publicAPI, model, ['useViewUp', 'camera']);
  macro.setGetArray(publicAPI, model, ['viewUp'], 3); // Object methods

  vtkFollower(publicAPI, model);
} // ----------------------------------------------------------------------------

var newInstance = macro.newInstance(extend, 'vtkFollower'); // ----------------------------------------------------------------------------

var vtkFollower$1 = {
  newInstance: newInstance,
  extend: extend
};

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