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

Visualization Toolkit for the Web

import { mat4 } from 'gl-matrix';
import { m as macro } from '../../macros2.js';
import vtkBoundingBox from '../../Common/DataModel/BoundingBox.js';
import vtkProp3D from './Prop3D.js';
import vtkImageProperty from './ImageProperty.js';

const {
  vtkDebugMacro
} = macro;

// ----------------------------------------------------------------------------
// vtkImageSlice methods
// ----------------------------------------------------------------------------

function vtkImageSlice(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkImageSlice');
  publicAPI.getActors = () => publicAPI;
  publicAPI.getImages = () => 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 scalar array, if any?
    isOpaque = isOpaque && (!model.mapper || model.mapper.getIsOpaque());
    return isOpaque;
  };

  // Always render during opaque pass, to keep the behavior
  // predictable and because depth-peeling kills alpha-blending.
  // In the future, the Renderer should render images in layers,
  // i.e. where each image will have a layer number assigned to it,
  // and the Renderer will do the images in their own pass.
  publicAPI.hasTranslucentPolygonalGeometry = () => false;
  publicAPI.makeProperty = vtkImageProperty.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.
    const zip = rows => rows[0].map((_, c) => rows.map(row => row[c]));
    if (!model.mapperBounds || !zip([bds, model.mapperBounds]).reduce((a, b) => a && b[0] === b[1], true) || publicAPI.getMTime() > model.boundsMTime.getMTime()) {
      vtkDebugMacro('Recomputing bounds...');
      model.mapperBounds = bds.map(x => x);
      publicAPI.computeMatrix();
      const tmp4 = new Float64Array(16);
      mat4.transpose(tmp4, model.matrix);
      vtkBoundingBox.transformBounds(bds, tmp4, model.bounds);
      model.boundsMTime.modified();
    }
    return model.bounds;
  };
  publicAPI.getBoundsForSlice = (slice, thickness) => {
    // Check for the special case when the mapper's bounds are unknown
    const bds = model.mapper.getBoundsForSlice(slice, thickness);
    // Check for the special case when the actor is empty.
    if (!vtkBoundingBox.isValid(bds)) {
      return bds;
    }
    publicAPI.computeMatrix();
    const tmp4 = new Float64Array(16);
    mat4.transpose(tmp4, model.matrix);
    const newBounds = vtkBoundingBox.transformBounds(bds, tmp4);
    return newBounds;
  };

  //----------------------------------------------------------------------------
  // Get the minimum X bound
  publicAPI.getMinXBound = () => publicAPI.getBounds()[0];

  // Get the maximum X bound
  publicAPI.getMaxXBound = () => publicAPI.getBounds()[1];

  // Get the minimum Y bound
  publicAPI.getMinYBound = () => publicAPI.getBounds()[2];

  // Get the maximum Y bound
  publicAPI.getMaxYBound = () => publicAPI.getBounds()[3];

  // Get the minimum Z bound
  publicAPI.getMinZBound = () => publicAPI.getBounds()[4];

  // Get the maximum Z bound
  publicAPI.getMaxZBound = () => publicAPI.getBounds()[5];
  publicAPI.getMTime = () => {
    let mt = model.mtime;
    if (model.property !== null) {
      const time = model.property.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;
      }
    }
    if (model.property !== null) {
      let time = model.property.getMTime();
      mt = time > mt ? time : mt;
      if (model.property.getRGBTransferFunction() !== null) {
        time = model.property.getRGBTransferFunction().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,
  forceOpaque: false,
  forceTranslucent: false,
  bounds: [...vtkBoundingBox.INIT_BOUNDS]
};

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

function extend(publicAPI, model) {
  let initialValues = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  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, ['mapper', 'forceOpaque', 'forceTranslucent']);
  macro.getArray(publicAPI, model, ['bounds'], 6);

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

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

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

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

var vtkImageSlice$1 = {
  newInstance,
  extend
};

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