@acransac/vtk.js/Sources/Rendering/Core/Actor/index.js

Visualization Toolkit for the Web

import { vec3, mat4 } from 'gl-matrix';
import macro from 'vtk.js/Sources/macro';
import vtkProp3D from 'vtk.js/Sources/Rendering/Core/Prop3D';
import vtkProperty from 'vtk.js/Sources/Rendering/Core/Property';

const { vtkDebugMacro } = macro;

// ----------------------------------------------------------------------------
// vtkActor methods
// ----------------------------------------------------------------------------

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

  // Capture 'parentClass' api for internal use
  const superClass = { ...publicAPI };

  publicAPI.getActors = () => publicAPI;

  publicAPI.getIsOpaque = () => {
    if (model.forceOpaque) {
      return true;
    }
    if (model.forceTranslucent) {
      return false;
    }
    // make sure we have a property
    if (!model.property) {
      // force creation of a property
      publicAPI.getProperty();
    }

    let isOpaque = model.property.getOpacity() >= 1.0;

    // are we using an opaque texture, if any?
    isOpaque = isOpaque && (!model.texture || !model.texture.isTranslucent());

    // are we using an opaque scalar array, if any?
    isOpaque = isOpaque && (!model.mapper || model.mapper.getIsOpaque());

    return isOpaque;
  };

  publicAPI.hasTranslucentPolygonalGeometry = () => {
    if (model.mapper === null) {
      return false;
    }
    // make sure we have a property
    if (model.property === null) {
      // force creation of a property
      publicAPI.setProperty(publicAPI.makeProperty());
    }

    // is this actor opaque ?
    return !publicAPI.getIsOpaque();
  };

  publicAPI.makeProperty = vtkProperty.newInstance;

  publicAPI.getProperty = () => {
    if (model.property === null) {
      model.property = publicAPI.makeProperty();
    }
    return model.property;
  };

  publicAPI.getBounds = () => {
    if (model.mapper === null) {
      return model.bounds;
    }

    // Check for the special case when the mapper's bounds are unknown
    const bds = model.mapper.getBounds();
    if (!bds || bds.length !== 6) {
      return bds;
    }

    // Check for the special case when the actor is empty.
    if (bds[0] > bds[1]) {
      model.mapperBounds = bds.concat(); // copy the mapper's bounds
      model.bounds = [1, -1, 1, -1, 1, -1];
      model.boundsMTime.modified();
      return bds;
    }

    // Check if we have cached values for these bounds - we cache the
    // values returned by model.mapper.getBounds() and we store the time
    // of caching. If the values returned this time are different, or
    // the modified time of this class is newer than the cached time,
    // then we need to rebuild.
    if (
      !model.mapperBounds ||
      bds[0] !== model.mapperBounds[0] ||
      bds[1] !== model.mapperBounds[1] ||
      bds[2] !== model.mapperBounds[2] ||
      bds[3] !== model.mapperBounds[3] ||
      bds[4] !== model.mapperBounds[4] ||
      bds[5] !== model.mapperBounds[5] ||
      publicAPI.getMTime() > model.boundsMTime.getMTime()
    ) {
      vtkDebugMacro('Recomputing bounds...');
      model.mapperBounds = bds.concat(); // copy the mapper's bounds
      const bbox = [
        vec3.fromValues(bds[1], bds[3], bds[5]),
        vec3.fromValues(bds[1], bds[2], bds[5]),
        vec3.fromValues(bds[0], bds[2], bds[5]),
        vec3.fromValues(bds[0], bds[3], bds[5]),
        vec3.fromValues(bds[1], bds[3], bds[4]),
        vec3.fromValues(bds[1], bds[2], bds[4]),
        vec3.fromValues(bds[0], bds[2], bds[4]),
        vec3.fromValues(bds[0], bds[3], bds[4]),
      ];

      publicAPI.computeMatrix();
      const tmp4 = mat4.create();
      mat4.transpose(tmp4, model.matrix);
      bbox.forEach((pt) => vec3.transformMat4(pt, pt, tmp4));

      /* eslint-disable no-multi-assign */
      model.bounds[0] = model.bounds[2] = model.bounds[4] = Number.MAX_VALUE;
      model.bounds[1] = model.bounds[3] = model.bounds[5] = -Number.MAX_VALUE;
      /* eslint-enable no-multi-assign */

      model.bounds = model.bounds.map((d, i) =>
        i % 2 === 0
          ? bbox.reduce((a, b) => (a > b[i / 2] ? b[i / 2] : a), d)
          : bbox.reduce((a, b) => (a < b[(i - 1) / 2] ? b[(i - 1) / 2] : a), d)
      );

      model.boundsMTime.modified();
    }
    return model.bounds;
  };

  publicAPI.getMTime = () => {
    let mt = superClass.getMTime();
    if (model.property !== null) {
      const time = model.property.getMTime();
      mt = time > mt ? time : mt;
    }

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

    return mt;
  };

  publicAPI.getRedrawMTime = () => {
    let mt = model.mtime;
    if (model.mapper !== null) {
      let time = model.mapper.getMTime();
      mt = time > mt ? time : mt;
      if (model.mapper.getInput() !== null) {
        // FIXME !!! getInputAlgorithm / getInput
        model.mapper.getInputAlgorithm().update();
        time = model.mapper.getInput().getMTime();
        mt = time > mt ? time : mt;
      }
    }
    return mt;
  };

  publicAPI.getSupportsSelection = () =>
    model.mapper ? model.mapper.getSupportsSelection() : false;
}

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

const DEFAULT_VALUES = {
  mapper: null,
  property: null,
  backfaceProperty: null,

  forceOpaque: false,
  forceTranslucent: false,

  bounds: [1, -1, 1, -1, 1, -1],
};

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

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

  // Inheritance
  vtkProp3D.extend(publicAPI, model, initialValues);

  // vtkTimeStamp
  model.boundsMTime = {};
  macro.obj(model.boundsMTime);

  // Build VTK API
  macro.set(publicAPI, model, ['property']);
  macro.setGet(publicAPI, model, [
    'backfaceProperty',
    'forceOpaque',
    'forceTranslucent',
    'mapper',
  ]);

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

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

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

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

export default { newInstance, extend };