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

Visualization Toolkit for the Web

import { m as macro } from '../../macros2.js';
import vtkCompositeCameraManipulator from './CompositeCameraManipulator.js';
import vtkCompositeMouseManipulator from './CompositeMouseManipulator.js';

// ----------------------------------------------------------------------------
// vtkMouseCameraTrackballZoomManipulator methods
// ----------------------------------------------------------------------------

function vtkMouseCameraTrackballZoomManipulator(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkMouseCameraTrackballZoomManipulator');
  publicAPI.onButtonDown = (interactor, renderer, position) => {
    model.previousPosition = position;
    const size = interactor.getView().getViewportSize(renderer);
    const camera = renderer.getActiveCamera();
    const direction = model.flipDirection ? -1 : 1;
    if (camera.getParallelProjection()) {
      model.zoomScale = 1.5 / size[1] * direction;
    } else {
      const range = camera.getClippingRange();
      model.zoomScale = 1.5 * (range[1] / size[1]) * direction;
    }
  };
  publicAPI.onMouseMove = (interactor, renderer, position) => {
    if (!position) {
      return;
    }
    const dy = model.previousPosition.y - position.y;
    const camera = renderer.getActiveCamera();
    if (camera.getParallelProjection()) {
      const k = dy * model.zoomScale;
      camera.setParallelScale((1.0 - k) * camera.getParallelScale());
    } else {
      const cameraPos = camera.getPosition();
      const cameraFp = camera.getFocalPoint();
      const norm = camera.getDirectionOfProjection();
      const k = dy * model.zoomScale;
      let tmp = k * norm[0];
      cameraPos[0] += tmp;
      cameraFp[0] += tmp;
      tmp = k * norm[1];
      cameraPos[1] += tmp;
      cameraFp[1] += tmp;
      tmp = k * norm[2];
      cameraPos[2] += tmp;
      cameraFp[2] += tmp;
      if (!camera.getFreezeFocalPoint()) {
        camera.setFocalPoint(cameraFp[0], cameraFp[1], cameraFp[2]);
      }
      camera.setPosition(cameraPos[0], cameraPos[1], cameraPos[2]);
      renderer.resetCameraClippingRange();
    }
    if (interactor.getLightFollowCamera()) {
      renderer.updateLightsGeometryToFollowCamera();
    }
    model.previousPosition = position;
  };
  publicAPI.onScroll = (interactor, renderer, delta) => {
    if (!delta) {
      return;
    }
    const camera = renderer.getActiveCamera();
    const dyf = 1 - delta / 10;
    if (camera.getParallelProjection()) {
      camera.setParallelScale(camera.getParallelScale() / dyf);
    } else {
      camera.dolly(dyf);
      renderer.resetCameraClippingRange();
    }
    if (interactor.getLightFollowCamera()) {
      renderer.updateLightsGeometryToFollowCamera();
    }
  };
}

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

const DEFAULT_VALUES = {
  zoomScale: 0.0,
  flipDirection: false
};

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

function extend(publicAPI, model) {
  let initialValues = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  Object.assign(model, DEFAULT_VALUES, initialValues);

  // Inheritance
  macro.obj(publicAPI, model);
  vtkCompositeMouseManipulator.extend(publicAPI, model, initialValues);
  vtkCompositeCameraManipulator.extend(publicAPI, model, initialValues);
  macro.setGet(publicAPI, model, ['flipDirection']);

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

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

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

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

var vtkMouseCameraTrackballZoomManipulator$1 = {
  newInstance,
  extend
};

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