MouseCameraTrackballRotateManipulator

Source

index.js
import { vec3, mat4 } from 'gl-matrix';
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';

// ----------------------------------------------------------------------------
// 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().getSize();

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

// Compute projection of cameraPos onto worldUpVec
vtkMath.multiplyScalar(
centerOfRotation,
vtkMath.dot(cameraPos, model.worldUpVec) /
vtkMath.dot(model.worldUpVec, model.worldUpVec)
);

if (model.useFocalPointAsCenterOfRotation) {
vtkMath.add(center, centerOfRotation, centerOfRotation);
}

mat4.translate(trans, trans, centerOfRotation);
mat4.rotate(
trans,
trans,
vtkMath.radiansFromDegrees(((360.0 * dx) / size[0]) * rotationFactor),
model.worldUpVec
);

// Translate back
if (model.useFocalPointAsCenterOfRotation) {
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,
vtkMath.subtract(center, centerOfRotation, centerOfRotation)
);
}
} else {
mat4.translate(trans, trans, center);
mat4.rotate(
trans,
trans,
vtkMath.radiansFromDegrees(((360.0 * dx) / size[0]) * rotationFactor),
viewUp
);
}

// Elevation
vtkMath.cross(camera.getDirectionOfProjection(), viewUp, v2);
mat4.rotate(
trans,
trans,
vtkMath.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,
};

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

export 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);
}

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

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

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

export default { newInstance, extend };