MouseCameraTrackballPanManipulator

Methods

Source

index.d.ts

import vtkCompositeCameraManipulator, {
  ICompositeCameraManipulatorInitialValues,
} from '../CompositeCameraManipulator';
import vtkCompositeMouseManipulator, {
  ICompositeMouseManipulatorInitialValues,
} from '../CompositeMouseManipulator';
import { vtkObject } from '../../../interfaces';

export interface vtkMouseCameraTrackballPanManipulator
  extends vtkObject,
    vtkCompositeCameraManipulator,
    vtkCompositeMouseManipulator {}

export interface IMouseCameraTrackballPanManipulatorInitialValues
  extends ICompositeCameraManipulatorInitialValues,
    ICompositeMouseManipulatorInitialValues {}

export function newInstance(
  initialValues?: IMouseCameraTrackballPanManipulatorInitialValues
): vtkMouseCameraTrackballPanManipulator;

export function extend(
  publicAPI: object,
  model: object,
  initialValues?: IMouseCameraTrackballPanManipulatorInitialValues
): void;

export const vtkMouseCameraTrackballPanManipulator: {
  newInstance: typeof newInstance;
  extend: typeof extend;
};

export default vtkMouseCameraTrackballPanManipulator;

index.js

import macro from 'vtk.js/Sources/macros';
import vtkCompositeCameraManipulator from 'vtk.js/Sources/Interaction/Manipulators/CompositeCameraManipulator';
import vtkCompositeMouseManipulator from 'vtk.js/Sources/Interaction/Manipulators/CompositeMouseManipulator';
import * as vtkMath from 'vtk.js/Sources/Common/Core/Math';

// ----------------------------------------------------------------------------
// vtkMouseCameraTrackballPanManipulator methods
// ----------------------------------------------------------------------------

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

  publicAPI.onButtonDown = (interactor, renderer, position) => {
    model.previousPosition = position;
  };

  publicAPI.onMouseMove = (interactor, renderer, position) => {
    if (!position) {
      return;
    }

    const pos = position;
    const lastPos = model.previousPosition;
    model.previousPosition = position;

    const camera = renderer.getActiveCamera();
    const camPos = camera.getPosition();
    const fp = camera.getFocalPoint();

    if (camera.getParallelProjection()) {
      camera.orthogonalizeViewUp();

      const up = camera.getViewUp();
      const vpn = camera.getViewPlaneNormal();

      const right = [0, 0, 0];

      vtkMath.cross(vpn, up, right);

      // These are different because y is flipped.
      const height = interactor.getView().getViewportSize(renderer)[1];
      let dx = (pos.x - lastPos.x) / height;
      let dy = (lastPos.y - pos.y) / height;

      const scale = camera.getParallelScale();
      dx *= scale * 2.0;
      dy *= scale * 2.0;

      let tmp = right[0] * dx + up[0] * dy;
      camPos[0] += tmp;
      fp[0] += tmp;
      tmp = right[1] * dx + up[1] * dy;
      camPos[1] += tmp;
      fp[1] += tmp;
      tmp = right[2] * dx + up[2] * dy;
      camPos[2] += tmp;
      fp[2] += tmp;
      camera.setPosition(camPos[0], camPos[1], camPos[2]);
      camera.setFocalPoint(fp[0], fp[1], fp[2]);
    } else {
      const { center } = model;
      const style = interactor.getInteractorStyle();
      const focalDepth = style.computeWorldToDisplay(
        renderer,
        center[0],
        center[1],
        center[2]
      )[2];
      const worldPoint = style.computeDisplayToWorld(
        renderer,
        pos.x,
        pos.y,
        focalDepth
      );
      const lastWorldPoint = style.computeDisplayToWorld(
        renderer,
        lastPos.x,
        lastPos.y,
        focalDepth
      );

      const newCamPos = [
        camPos[0] + (lastWorldPoint[0] - worldPoint[0]),
        camPos[1] + (lastWorldPoint[1] - worldPoint[1]),
        camPos[2] + (lastWorldPoint[2] - worldPoint[2]),
      ];

      const newFp = [
        fp[0] + (lastWorldPoint[0] - worldPoint[0]),
        fp[1] + (lastWorldPoint[1] - worldPoint[1]),
        fp[2] + (lastWorldPoint[2] - worldPoint[2]),
      ];

      camera.setPosition(newCamPos[0], newCamPos[1], newCamPos[2]);
      camera.setFocalPoint(newFp[0], newFp[1], newFp[2]);
    }

    renderer.resetCameraClippingRange();

    if (interactor.getLightFollowCamera()) {
      renderer.updateLightsGeometryToFollowCamera();
    }
  };
}

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

const DEFAULT_VALUES = {};

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

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

  // Inheritance
  macro.obj(publicAPI, model);
  vtkCompositeCameraManipulator.extend(publicAPI, model, initialValues);
  vtkCompositeMouseManipulator.extend(publicAPI, model, initialValues);

  // Object specific methods
  vtkMouseCameraTrackballPanManipulator(publicAPI, model);
}

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

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

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

export default { newInstance, extend };