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) {
  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);

  // 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/macros';
import vtkCircleContextRepresentation from 'vtk.js/Sources/Widgets/Representations/CircleContextRepresentation';
import vtkPlanePointManipulator from 'vtk.js/Sources/Widgets/Manipulators/PlaneManipulator';
import vtkShapeWidget from 'vtk.js/Sources/Widgets/Widgets3D/ShapeWidget';
import vtkSphereHandleRepresentation from 'vtk.js/Sources/Widgets/Representations/SphereHandleRepresentation';
import widgetBehavior from 'vtk.js/Sources/Widgets/Widgets3D/EllipseWidget/behavior';
import stateGenerator from 'vtk.js/Sources/Widgets/Widgets3D/EllipseWidget/state';

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

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

  publicAPI.setManipulator(
    model.manipulator ||
      vtkPlanePointManipulator.newInstance({ useCameraNormal: true })
  );
}

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

function defaultValues(initialValues) {
  return {
    behavior: widgetBehavior,
    widgetState: stateGenerator(),
    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,
      },
    },
    ...initialValues,
  };
}

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

export function extend(publicAPI, model, initialValues = {}) {
  vtkShapeWidget.extend(publicAPI, model, defaultValues(initialValues));
  macro.setGet(publicAPI, model, ['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';
import { TextPosition } from 'vtk.js/Sources/Widgets/Widgets3D/ShapeWidget/Constants';

export default function generateState() {
  return (
    vtkStateBuilder
      .createBuilder()
      .addStateFromMixin({
        labels: ['moveHandle'],
        mixins: ['origin', 'color', 'scale1', 'visible', 'manipulator'],
        name: 'point1Handle',
        initialValues: {
          scale1: 10,
          visible: false,
        },
      })
      .addStateFromMixin({
        labels: ['moveHandle'],
        mixins: ['origin', 'color', 'scale1', 'visible', 'manipulator'],
        name: 'point2Handle',
        initialValues: {
          scale1: 10,
          visible: false,
        },
      })
      .addStateFromMixin({
        labels: ['ellipseHandle'],
        mixins: ['origin', 'color', 'scale3', 'visible', 'orientation'],
        name: 'ellipseHandle',
        initialValues: {
          // visible: false,
          scale3: [1, 1, 1],
        },
      })
      // FIXME: How to not duplicate with RectangleWidget
      .addStateFromMixin({
        labels: ['SVGtext'],
        mixins: ['origin', 'color', 'text', 'visible'],
        name: 'text',
        initialValues: {
          /* text is empty to set a text filed in the SVGLayer and to avoid
           * displaying text before positioning the handles */
          text: '',
        },
      })
      // FIXME: to move in text handle sub state
      .addField({
        name: 'textPosition',
        initialValue: [
          TextPosition.CENTER,
          TextPosition.CENTER,
          TextPosition.CENTER,
        ],
      })
      .addField({
        name: 'textWorldMargin',
        initialValue: 0,
      })
      .build()
  );
}