@kitware/vtk.js/Interaction/Manipulators/MouseCameraTrackballRotateManipulator.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 { x as multiplyScalar, d as dot, k as add, r as radiansFromDegrees, j as cross } from '../../Common/Core/Math/index.js';

// ----------------------------------------------------------------------------
// vtkMouseCameraTrackballRotateManipulator methods
// ----------------------------------------------------------------------------

function vtkMouseCameraTrackballRotateManipulator(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkMouseCameraTrackballRotateManipulator');
  const newCamPos = new Float64Array(3);
  const newFp = new Float64Array(3);
  const newViewUp = new Float64Array(3);
  const trans = new Float64Array(16);
  const v2 = new Float64Array(3);
  const centerNeg = new Float64Array(3);
  const direction = new Float64Array(3);
  publicAPI.onButtonDown = (interactor, renderer, position) => {
    model.previousPosition = position;
  };
  publicAPI.onMouseMove = (interactor, renderer, position) => {
    if (!position) {
      return;
    }
    const camera = renderer.getActiveCamera();
    const cameraPos = camera.getPosition();
    const cameraFp = camera.getFocalPoint();
    mat4.identity(trans);
    const {
      center,
      rotationFactor
    } = model;
    if (model.useFocalPointAsCenterOfRotation) {
      center[0] = cameraFp[0];
      center[1] = cameraFp[1];
      center[2] = cameraFp[2];
    }
    const dx = model.previousPosition.x - position.x;
    const dy = model.previousPosition.y - position.y;
    const size = interactor.getView().getViewportSize(renderer);

    // Azimuth
    const viewUp = camera.getViewUp();
    if (model.useWorldUpVec) {
      const centerOfRotation = new Float64Array(3);
      vec3.copy(centerOfRotation, model.worldUpVec);

      // Compute projection of cameraPos onto worldUpVec
      multiplyScalar(centerOfRotation, dot(cameraPos, model.worldUpVec) / dot(model.worldUpVec, model.worldUpVec));
      add(center, centerOfRotation, centerOfRotation);
      mat4.translate(trans, trans, centerOfRotation);
      mat4.rotate(trans, trans, radiansFromDegrees(360.0 * dx / size[0] * rotationFactor), model.worldUpVec);

      // Translate back
      centerOfRotation[0] = -centerOfRotation[0];
      centerOfRotation[1] = -centerOfRotation[1];
      centerOfRotation[2] = -centerOfRotation[2];
      mat4.translate(trans, trans, centerOfRotation);
      mat4.translate(trans, trans, center);
    } else {
      mat4.translate(trans, trans, center);
      mat4.rotate(trans, trans, radiansFromDegrees(360.0 * dx / size[0] * rotationFactor), viewUp);
    }

    // Elevation
    cross(camera.getDirectionOfProjection(), viewUp, v2);
    mat4.rotate(trans, trans, radiansFromDegrees(-360.0 * dy / size[1] * rotationFactor), v2);

    // Translate back
    centerNeg[0] = -center[0];
    centerNeg[1] = -center[1];
    centerNeg[2] = -center[2];
    mat4.translate(trans, trans, centerNeg);

    // Apply transformation to camera position, focal point, and view up
    vec3.transformMat4(newCamPos, cameraPos, trans);
    vec3.transformMat4(newFp, cameraFp, trans);
    direction[0] = viewUp[0] + cameraPos[0];
    direction[1] = viewUp[1] + cameraPos[1];
    direction[2] = viewUp[2] + cameraPos[2];
    vec3.transformMat4(newViewUp, direction, trans);
    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 = {
  useWorldUpVec: false,
  // set WorldUpVector to be y-axis by default
  worldUpVec: [0, 1, 0],
  useFocalPointAsCenterOfRotation: false
};

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

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

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

  // Create get-set macro
  macro.setGet(publicAPI, model, ['useWorldUpVec']);
  macro.setGetArray(publicAPI, model, ['worldUpVec'], 3);
  macro.setGet(publicAPI, model, ['useFocalPointAsCenterOfRotation']);

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

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

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

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

var vtkMouseCameraTrackballRotateManipulator$1 = {
  newInstance,
  extend
};

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