@acransac/vtk.js/Examples/Volume/MultiSliceImageMapper/index.js

Visualization Toolkit for the Web

import 'vtk.js/Sources/favicon';

import vtkFullScreenRenderWindow from 'vtk.js/Sources/Rendering/Misc/FullScreenRenderWindow';
import vtkHttpDataSetReader from 'vtk.js/Sources/IO/Core/HttpDataSetReader';
import vtkImageMapper from 'vtk.js/Sources/Rendering/Core/ImageMapper';
import vtkImageSlice from 'vtk.js/Sources/Rendering/Core/ImageSlice';

import controlPanel from './controlPanel.html';

const fullScreenRenderWindow = vtkFullScreenRenderWindow.newInstance({
  background: [0, 0, 0],
});
const renderWindow = fullScreenRenderWindow.getRenderWindow();
const renderer = fullScreenRenderWindow.getRenderer();
fullScreenRenderWindow.addController(controlPanel);

const imageActorI = vtkImageSlice.newInstance();
const imageActorJ = vtkImageSlice.newInstance();
const imageActorK = vtkImageSlice.newInstance();

renderer.addActor(imageActorK);
renderer.addActor(imageActorJ);
renderer.addActor(imageActorI);

function updateColorLevel(e) {
  const colorLevel = Number(
    (e ? e.target : document.querySelector('.colorLevel')).value
  );
  imageActorI.getProperty().setColorLevel(colorLevel);
  imageActorJ.getProperty().setColorLevel(colorLevel);
  imageActorK.getProperty().setColorLevel(colorLevel);
  renderWindow.render();
}

function updateColorWindow(e) {
  const colorLevel = Number(
    (e ? e.target : document.querySelector('.colorWindow')).value
  );
  imageActorI.getProperty().setColorWindow(colorLevel);
  imageActorJ.getProperty().setColorWindow(colorLevel);
  imageActorK.getProperty().setColorWindow(colorLevel);
  renderWindow.render();
}

const reader = vtkHttpDataSetReader.newInstance({
  fetchGzip: true,
});
reader
  .setUrl(`${__BASE_PATH__}/data/volume/headsq.vti`, { loadData: true })
  .then(() => {
    const data = reader.getOutputData();
    const dataRange = data.getPointData().getScalars().getRange();
    const extent = data.getExtent();

    const imageMapperK = vtkImageMapper.newInstance();
    imageMapperK.setInputData(data);
    imageMapperK.setKSlice(30);
    imageActorK.setMapper(imageMapperK);

    const imageMapperJ = vtkImageMapper.newInstance();
    imageMapperJ.setInputData(data);
    imageMapperJ.setJSlice(30);
    imageActorJ.setMapper(imageMapperJ);

    const imageMapperI = vtkImageMapper.newInstance();
    imageMapperI.setInputData(data);
    imageMapperI.setISlice(30);
    imageActorI.setMapper(imageMapperI);

    renderer.resetCamera();
    renderer.resetCameraClippingRange();
    renderWindow.render();

    ['.sliceI', '.sliceJ', '.sliceK'].forEach((selector, idx) => {
      const el = document.querySelector(selector);
      el.setAttribute('min', extent[idx * 2 + 0]);
      el.setAttribute('max', extent[idx * 2 + 1]);
      el.setAttribute('value', 30);
    });

    ['.colorLevel', '.colorWindow'].forEach((selector) => {
      document.querySelector(selector).setAttribute('max', dataRange[1]);
      document.querySelector(selector).setAttribute('value', dataRange[1]);
    });
    document
      .querySelector('.colorLevel')
      .setAttribute('value', (dataRange[0] + dataRange[1]) / 2);
    updateColorLevel();
    updateColorWindow();
  });

document.querySelector('.sliceI').addEventListener('input', (e) => {
  imageActorI.getMapper().setISlice(Number(e.target.value));
  renderWindow.render();
});

document.querySelector('.sliceJ').addEventListener('input', (e) => {
  imageActorJ.getMapper().setJSlice(Number(e.target.value));
  renderWindow.render();
});

document.querySelector('.sliceK').addEventListener('input', (e) => {
  imageActorK.getMapper().setKSlice(Number(e.target.value));
  renderWindow.render();
});

document
  .querySelector('.colorLevel')
  .addEventListener('input', updateColorLevel);
document
  .querySelector('.colorWindow')
  .addEventListener('input', updateColorWindow);

global.fullScreen = fullScreenRenderWindow;
global.imageActorI = imageActorI;
global.imageActorJ = imageActorJ;
global.imageActorK = imageActorK;