@acransac/vtk.js/Sources/Widgets/Representations/PolyLineRepresentation/index.js

Visualization Toolkit for the Web

import macro from 'vtk.js/Sources/macro';
import vtkActor from 'vtk.js/Sources/Rendering/Core/Actor';
import vtkMapper from 'vtk.js/Sources/Rendering/Core/Mapper';
import * as vtkMath from 'vtk.js/Sources/Common/Core/Math';
import vtkPolyData from 'vtk.js/Sources/Common/DataModel/PolyData';
// import vtkTubeFilter from 'vtk.js/Sources/Filters/General/TubeFilter';
import vtkWidgetRepresentation from 'vtk.js/Sources/Widgets/Representations/WidgetRepresentation';

// ----------------------------------------------------------------------------
// vtkPolyLineRepresentation methods
// ----------------------------------------------------------------------------

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

  // --------------------------------------------------------------------------
  // Internal polydata dataset
  // --------------------------------------------------------------------------

  model.internalPolyData = vtkPolyData.newInstance({ mtime: 0 });
  model.cells = [];

  function allocateSize(size, closePolyLine = false) {
    if (size === 0) {
      model.internalPolyData.getPoints().setData(new Float32Array([0, 0, 0]));
      model.internalPolyData.getLines().setData(new Uint8Array(0));
    } else if (!model.points || model.points.length !== size * 3) {
      model.points = new Float32Array(size * 3);
      model.cells = new Uint8Array(size + 1 + (closePolyLine ? 1 : 0));
      model.cells[0] = model.cells.length - 1;
      for (let i = 1; i < model.cells.length; i++) {
        model.cells[i] = i - 1;
      }
      if (closePolyLine) {
        model.cells[model.cells.length - 1] = 0;
        console.log('closePolyLine', closePolyLine, model.cells);
      }
      model.internalPolyData.getPoints().setData(model.points, 3);
      model.internalPolyData.getLines().setData(model.cells);
    }
    return model.points;
  }

  // --------------------------------------------------------------------------
  // Generic rendering pipeline
  // --------------------------------------------------------------------------

  model.mapper = vtkMapper.newInstance();
  model.actor = vtkActor.newInstance();
  // model.tubes = vtkTubeFilter.newInstance({
  //   radius: 0.01,
  //   numberOfSides: 12,
  //   capping: false,
  // });

  // model.tubes.setInputConnection(publicAPI.getOutputPort());
  // model.mapper.setInputConnection(model.tubes.getOutputPort());
  model.mapper.setInputConnection(publicAPI.getOutputPort());
  model.actor.setMapper(model.mapper);

  publicAPI.addActor(model.actor);

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

  publicAPI.requestData = (inData, outData) => {
    const list = publicAPI.getRepresentationStates(inData[0]);
    let size = list.length;

    if (size > 1) {
      const lastState = list[list.length - 1];
      const last = lastState.getOrigin();
      const prevLast = list[list.length - 2].getOrigin();
      let delta =
        vtkMath.distance2BetweenPoints(last, prevLast) > model.threshold
          ? 0
          : 1;
      if (!delta && lastState.isVisible && !lastState.isVisible()) {
        delta++;
      }
      size -= delta;
    }

    const points = allocateSize(size, model.closePolyLine && size > 2);

    for (let i = 0; i < size; i++) {
      const coords = list[i].getOrigin();
      points[i * 3] = coords[0];
      points[i * 3 + 1] = coords[1];
      points[i * 3 + 2] = coords[2];
    }

    model.internalPolyData.modified();
    outData[0] = model.internalPolyData;
  };
}

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

const DEFAULT_VALUES = {
  threshold: Number.EPSILON,
  closePolyLine: false,
};

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

export function extend(publicAPI, model, initialValues = {}) {
  Object.assign(model, DEFAULT_VALUES, initialValues);
  vtkWidgetRepresentation.extend(publicAPI, model, initialValues);
  macro.setGet(publicAPI, model, ['threshold', 'closePolyLine']);

  vtkPolyLineRepresentation(publicAPI, model);
}

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

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

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

export default { newInstance, extend };