EllipseWidget

Source

behavior.js

import shapeBehavior from 'vtk.js/Sources/Widgets/Widgets3D/ShapeWidget/behavior';
import { vec3 } from 'gl-matrix';

export default function widgetBehavior(publicAPI, model) {
  // We inherit shapeBehavior
  shapeBehavior(publicAPI, model);
  const superClass = { ...publicAPI };

  model.classHierarchy.push('vtkEllipseWidgetProp');

  publicAPI.setCorners = (point1, point2) => {
    if (superClass.setCorners) {
      superClass.setCorners(point1, point2);
    }

    const center = [
      0.5 * (point1[0] + point2[0]),
      0.5 * (point1[1] + point2[1]),
      0.5 * (point1[2] + point2[2]),
    ];

    const diagonal = [0, 0, 0];
    vec3.subtract(diagonal, point2, center);

    const right = model.shapeHandle.getRight();
    const up = model.shapeHandle.getUp();
    const dir = model.shapeHandle.getDirection();

    const rightComponent = vec3.dot(diagonal, right);
    const upComponent = vec3.dot(diagonal, up);
    const dirComponent = vec3.dot(diagonal, dir);

    model.shapeHandle.setOrigin(center);
    model.shapeHandle.setScale3([rightComponent, upComponent, dirComponent]);
  };
}

index.js

import macro from 'vtk.js/Sources/macro';
import vtkAbstractWidgetFactory from 'vtk.js/Sources/Widgets/Core/AbstractWidgetFactory';
import vtkPlanePointManipulator from 'vtk.js/Sources/Widgets/Manipulators/PlaneManipulator';
import vtkSphereHandleRepresentation from 'vtk.js/Sources/Widgets/Representations/SphereHandleRepresentation';
import vtkCircleContextRepresentation from 'vtk.js/Sources/Widgets/Representations/CircleContextRepresentation';
import widgetBehavior from 'vtk.js/Sources/Widgets/Widgets3D/EllipseWidget/behavior';
import stateGenerator from 'vtk.js/Sources/Widgets/Widgets3D/EllipseWidget/state';

import SHAPE_DEFAULT_VALUES from 'vtk.js/Sources/Widgets/Widgets3D/ShapeWidget';

import {
  BehaviorCategory,
  ShapeBehavior,
} from 'vtk.js/Sources/Widgets/Widgets3D/ShapeWidget/Constants';

import { ViewTypes } from 'vtk.js/Sources/Widgets/Core/WidgetManager/Constants';

// ----------------------------------------------------------------------------
// Factory
// ----------------------------------------------------------------------------

function vtkEllipseWidget(publicAPI, model) {
  model.classHierarchy.push('vtkEllipseWidget');

  // --- Widget Requirement ---------------------------------------------------

  model.methodsToLink = [
    'activeScaleFactor',
    'activeColor',
    'useActiveColor',
    'glyphResolution',
    'defaultScale',
    'drawBorder',
    'drawFace',
    'opacity',
  ];

  model.behavior = widgetBehavior;
  publicAPI.getRepresentationsForViewType = (viewType) => {
    switch (viewType) {
      case ViewTypes.DEFAULT:
      case ViewTypes.GEOMETRY:
      case ViewTypes.SLICE:
      case ViewTypes.VOLUME:
      default:
        return [
          { builder: vtkSphereHandleRepresentation, labels: ['moveHandle'] },
          {
            builder: vtkCircleContextRepresentation,
            labels: ['ellipseHandle'],
          },
        ];
    }
  };

  // --------------------------------------------------------------------------
  // initialization
  // --------------------------------------------------------------------------

  // Default manipulator
  model.manipulator = vtkPlanePointManipulator.newInstance();
  model.widgetState = stateGenerator();
  model.shapeHandle = model.widgetState.getEllipseHandle();
  model.point1Handle = model.widgetState.getPoint1Handle();
  model.point2Handle = model.widgetState.getPoint2Handle();
  model.point1Handle.setManipulator(model.manipulator);
  model.point2Handle.setManipulator(model.manipulator);
}

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

const DEFAULT_VALUES = {
  modifierBehavior: {
    None: {
      [BehaviorCategory.PLACEMENT]:
        ShapeBehavior[BehaviorCategory.PLACEMENT].CLICK_AND_DRAG,
      [BehaviorCategory.POINTS]:
        ShapeBehavior[BehaviorCategory.POINTS].CENTER_TO_CORNER,
      [BehaviorCategory.RATIO]: ShapeBehavior[BehaviorCategory.RATIO].FREE,
    },
    Shift: {
      [BehaviorCategory.RATIO]: ShapeBehavior[BehaviorCategory.RATIO].FIXED,
    },
    Control: {
      [BehaviorCategory.POINTS]:
        ShapeBehavior[BehaviorCategory.POINTS].CORNER_TO_CORNER,
    },
  },
};

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

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

  vtkAbstractWidgetFactory.extend(publicAPI, model, initialValues);
  macro.setGet(publicAPI, model, ['manipulator', 'widgetState']);

  vtkEllipseWidget(publicAPI, model);
}

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

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

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

export default { newInstance, extend };

state.js

import vtkStateBuilder from 'vtk.js/Sources/Widgets/Core/StateBuilder';

export default function generateState() {
  return vtkStateBuilder
    .createBuilder()
    .addStateFromMixin({
      labels: ['moveHandle'],
      mixins: ['origin', 'color', 'scale1', 'visible', 'manipulator'],
      name: 'point1Handle',
      initialValues: {
        scale1: 10,
        origin: [0, 0, 0],
        visible: false,
      },
    })
    .addStateFromMixin({
      labels: ['moveHandle'],
      mixins: ['origin', 'color', 'scale1', 'visible', 'manipulator'],
      name: 'point2Handle',
      initialValues: {
        scale1: 10,
        origin: [0, 0, 0],
        visible: false,
      },
    })
    .addStateFromMixin({
      labels: ['ellipseHandle'],
      mixins: ['origin', 'color', 'scale3', 'visible', 'orientation'],
      name: 'ellipseHandle',
      initialValues: {
        visible: false,
        scale3: [1, 1, 1],
      },
    })
    .build();
}