@edsilv/ami.js/src/widgets/widgets.voxelProbe.js

<p align="center"> <img src="https://user-images.githubusercontent.com/214063/46479857-4cd66e80-c7f0-11e8-9585-5748409c9490.png" width="60%"> </p>

import { widgetsBase } from './widgets.base';
import { widgetsHandle as widgetsHandleFactory } from './widgets.handle';
import ModelsVoxel from '../models/models.voxel';
import CoreUtils from '../core/core.utils';

/**
 * @module widgets/voxelProbe
 */
const widgetsVoxelprobe = (three = window.THREE) => {
  if (three === undefined || three.Object3D === undefined) {
    return null;
  }

  const Constructor = widgetsBase(three);
  return class extends Constructor {
    constructor(targetMesh, controls, params = {}) {
      super(targetMesh, controls, params);

      this._widgetType = 'VoxelProbe';

      // incoming parameters (optional: worldPosition)
      this._stack = params.stack; // required

      this._container.style.cursor = 'pointer';
      this._controls.enabled = false; // controls should be disabled for widgets with a single handle
      this._initialized = false; // set to true onEnd
      this._active = true;
      this._moving = true;
      this._domHovered = false;

      // dom stuff
      this._label = null;

      // handle (represent voxel)
      const WidgetsHandle = widgetsHandleFactory(three);
      this._handle = new WidgetsHandle(targetMesh, controls, params);
      this.add(this._handle);

      this._moveHandle = new WidgetsHandle(targetMesh, controls, params);
      this.add(this._moveHandle);
      this._moveHandle.hide();

      this.create();

      // event listeners
      this.onMove = this.onMove.bind(this);
      this.onHover = this.onHover.bind(this);
      this.addEventListeners();
    }

    addEventListeners() {
      this._label.addEventListener('mouseenter', this.onHover);
      this._label.addEventListener('mouseleave', this.onHover);

      this._container.addEventListener('wheel', this.onMove);
    }

    removeEventListeners() {
      this._label.removeEventListener('mouseenter', this.onHover);
      this._label.removeEventListener('mouseleave', this.onHover);

      this._container.removeEventListener('wheel', this.onMove);
    }

    onStart(evt) {
      this._moveHandle.onMove(evt, true);
      this._handle.onStart(evt);

      this._active = this._handle.active || this._domHovered;

      if (this._domHovered) {
        this._moving = true;
        this._controls.enabled = false;
      }

      this.update();
    }

    onMove(evt) {
      if (this._active) {
        const prevPosition = this._moveHandle.worldPosition.clone();

        this._dragged = true;
        this._moveHandle.onMove(evt, true);

        if (this._moving) {
          this._handle.worldPosition.add(this._moveHandle.worldPosition.clone().sub(prevPosition));
        }
      } else {
        this.onHover(null);
      }

      this._handle.onMove(evt);

      this.update();
    }

    onEnd() {
      this._handle.onEnd();

      if (!this._dragged && this._active && this._initialized) {
        this._selected = !this._selected; // change state if there was no dragging
        this._handle.selected = this._selected;
      }

      this._initialized = true;
      this._active = this._handle.active;
      this._dragged = false;
      this._moving = false;

      this.update();
    }

    onHover(evt) {
      if (evt) {
        this.hoverDom(evt);
      }

      this._hovered = this._handle.hovered || this._domHovered;
      this._container.style.cursor = this._hovered ? 'pointer' : 'default';
    }

    hoverDom(evt) {
      this._domHovered = evt.type === 'mouseenter';
    }

    create() {
      this.createVoxel();
      this.createDOM();
    }

    createVoxel() {
      this._voxel = new ModelsVoxel();
      this._voxel.id = this.id;
    }

    createDOM() {
      this._label = document.createElement('div');
      this._label.className = 'widgets-label';

      // measurements
      let measurementsContainer = document.createElement('div');
      // LPS
      let lpsContainer = document.createElement('div');
      lpsContainer.className = 'lpsPosition';
      measurementsContainer.appendChild(lpsContainer);
      // IJK
      let ijkContainer = document.createElement('div');
      ijkContainer.className = 'ijkPosition';
      measurementsContainer.appendChild(ijkContainer);
      // Value
      let valueContainer = document.createElement('div');
      valueContainer.className = 'value';
      measurementsContainer.appendChild(valueContainer);

      this._label.appendChild(measurementsContainer);

      this._container.appendChild(this._label);

      this.updateDOMColor();
    }

    update() {
      this.updateColor();

      this._handle.update();
      this._worldPosition.copy(this._handle.worldPosition);

      this.updateVoxel(); // set data coordinates && value

      this.updateDOM();
    }

    updateVoxel() {
      this._voxel.worldCoordinates = this._worldPosition;
      this._voxel.dataCoordinates = CoreUtils.worldToData(this._stack.lps2IJK, this._worldPosition);

      // update value
      let value = CoreUtils.getPixelData(this._stack, this._voxel.dataCoordinates);

      this._voxel.value =
        value === null || this._stack.numberOfChannels > 1
          ? 'NA' // coordinates outside the image or RGB
          : CoreUtils.rescaleSlopeIntercept(
              value,
              this._stack.rescaleSlope,
              this._stack.rescaleIntercept
            ).toFixed();
    }

    updateDOM() {
      const rasContainer = this._label.querySelector('.lpsPosition');
      const ijkContainer = this._label.querySelector('.ijkPosition');
      const valueContainer = this._label.querySelector('.value');

      rasContainer.innerHTML = `LPS: 
      ${this._voxel.worldCoordinates.x.toFixed(2)} :
      ${this._voxel.worldCoordinates.y.toFixed(2)} :
      ${this._voxel.worldCoordinates.z.toFixed(2)}`;
      ijkContainer.innerHTML = `IJK: 
      ${this._voxel.dataCoordinates.x} :
      ${this._voxel.dataCoordinates.y} :
      ${this._voxel.dataCoordinates.z}`;
      valueContainer.innerHTML = `Value: ${this._voxel.value}`;

      this.updateDOMColor();

      const transform = this.adjustLabelTransform(this._label, this._handle.screenPosition, true);

      this._label.style.transform = `translate3D(${transform.x}px, ${transform.y}px, 0)`;
    }

    updateDOMColor() {
      this._label.style.borderColor = this._color;
    }

    free() {
      this.removeEventListeners();

      this.remove(this._handle);
      this._handle.free();
      this._handle = null;
      this.remove(this._moveHandle);
      this._moveHandle.free();
      this._moveHandle = null;

      this._container.removeChild(this._label);

      this._stack = null;
      this._voxel = null;

      super.free();
    }

    hideDOM() {
      this._label.style.display = 'none';
      this._handle.hideDOM();
    }

    showDOM() {
      this._label.style.display = '';
      this._handle.showDOM();
    }

    get targetMesh() {
      return this._targetMesh;
    }

    set targetMesh(targetMesh) {
      this._targetMesh = targetMesh;
      this._handle.targetMesh = targetMesh;
      this._moveHandle.targetMesh = targetMesh;
      this.update();
    }

    get worldPosition() {
      return this._worldPosition;
    }

    set worldPosition(worldPosition) {
      this._handle.worldPosition.copy(worldPosition);
      this._moveHandle.worldPosition.copy(worldPosition);
      this._worldPosition.copy(worldPosition);
      this.update();
    }

    get active() {
      return this._active;
    }

    set active(active) {
      this._active = active;
      this._controls.enabled = !this._active;

      this.update();
    }
  };
};

export { widgetsVoxelprobe };
export default widgetsVoxelprobe();