@kitware/vtk.js/Interaction/Manipulators/MouseCameraTrackballRollManipulator.js

Visualization Toolkit for the Web

import { mat4, vec3 } from 'gl-matrix';
import { m as macro } from '../../macros2.js';
import vtkCompositeCameraManipulator from './CompositeCameraManipulator.js';
import vtkCompositeMouseManipulator from './CompositeMouseManipulator.js';
import { r as radiansFromDegrees, B as degreesFromRadians } from '../../Common/Core/Math/index.js';

// ----------------------------------------------------------------------------
// vtkMouseCameraTrackballRollManipulator methods
// ----------------------------------------------------------------------------

function vtkMouseCameraTrackballRollManipulator(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkMouseCameraTrackballRollManipulator');
  const axis = new Float64Array(3);
  const direction = new Float64Array(3);
  const centerNeg = new Float64Array(3);
  const transform = new Float64Array(16);
  const newCamPos = new Float64Array(3);
  const newFp = new Float64Array(3);
  const newViewUp = new Float64Array(3);
  publicAPI.onButtonDown = (interactor, renderer, position) => {
    model.previousPosition = position;
  };
  publicAPI.onMouseMove = (interactor, renderer, position) => {
    if (!position) {
      return;
    }
    const camera = renderer.getActiveCamera();

    // compute view vector (rotation axis)
    const cameraPos = camera.getPosition();
    const cameraFp = camera.getFocalPoint();
    const viewUp = camera.getViewUp();
    axis[0] = cameraFp[0] - cameraPos[0];
    axis[1] = cameraFp[1] - cameraPos[1];
    axis[2] = cameraFp[2] - cameraPos[2];

    // compute the angle of rotation
    // - first compute the two vectors (center to mouse)
    publicAPI.computeDisplayCenter(interactor.getInteractorStyle(), renderer);
    const x1 = model.previousPosition.x - model.displayCenter[0];
    const x2 = position.x - model.displayCenter[0];
    const y1 = model.previousPosition.y - model.displayCenter[1];
    const y2 = position.y - model.displayCenter[1];
    if (x2 === 0 && y2 === 0 || x1 === 0 && y1 === 0) {
      // don't ever want to divide by zero
      return;
    }

    // - divide by magnitudes to get angle
    const angle = degreesFromRadians((x1 * y2 - y1 * x2) / (Math.sqrt(x1 * x1 + y1 * y1) * Math.sqrt(x2 * x2 + y2 * y2)));
    const {
      center
    } = model;
    mat4.identity(transform);
    centerNeg[0] = -center[0];
    centerNeg[1] = -center[1];
    centerNeg[2] = -center[2];

    // Translate to center
    mat4.translate(transform, transform, center);

    // roll
    mat4.rotate(transform, transform, radiansFromDegrees(angle), axis);

    // Translate back
    mat4.translate(transform, transform, centerNeg);

    // Apply transformation to camera position, focal point, and view up
    vec3.transformMat4(newCamPos, cameraPos, transform);
    vec3.transformMat4(newFp, cameraFp, transform);
    direction[0] = viewUp[0] + cameraPos[0];
    direction[1] = viewUp[1] + cameraPos[1];
    direction[2] = viewUp[2] + cameraPos[2];
    vec3.transformMat4(newViewUp, direction, transform);
    camera.setPosition(newCamPos[0], newCamPos[1], newCamPos[2]);
    camera.setFocalPoint(newFp[0], newFp[1], newFp[2]);
    camera.setViewUp(newViewUp[0] - newCamPos[0], newViewUp[1] - newCamPos[1], newViewUp[2] - newCamPos[2]);
    camera.orthogonalizeViewUp();
    renderer.resetCameraClippingRange();
    if (interactor.getLightFollowCamera()) {
      renderer.updateLightsGeometryToFollowCamera();
    }
    model.previousPosition = position;
  };
}

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

const DEFAULT_VALUES = {};

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

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
  vtkMouseCameraTrackballRollManipulator(publicAPI, model);
}

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

const newInstance = macro.newInstance(extend, 'vtkMouseCameraTrackballRollManipulator');

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

var vtkMouseCameraTrackballRollManipulator$1 = {
  newInstance,
  extend
};

export { vtkMouseCameraTrackballRollManipulator$1 as default, extend, newInstance };