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index.js
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index.js
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import macro from 'vtk.js/Sources/macro';
import vtkCameraManipulator from 'vtk.js/Sources/Interaction/Manipulators/CameraManipulator';
import vtkTrackballRotate from 'vtk.js/Sources/Interaction/Manipulators/TrackballRotate';
import vtkTrackballRoll from 'vtk.js/Sources/Interaction/Manipulators/TrackballRoll';
function max(x, y) {
return x < y ? y : x;
}
function sqr(x) {
return x * x;
}
// ----------------------------------------------------------------------------
// vtkTrackballMultiRotate methods
// ----------------------------------------------------------------------------
function vtkTrackballMultiRotate(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkTrackballMultiRotate');
const rotateManipulator = vtkTrackballRotate.newInstance();
const rollManipulator = vtkTrackballRoll.newInstance();
let currentManipulator = null;
publicAPI.onButtonDown = (x, y, ren, rwi) => {
const viewSize = rwi.getView().getSize();
const viewCenter = [0.5 * viewSize[0], 0.5 * viewSize[1]];
const rotateRadius = 0.9 * max(viewCenter[0], viewCenter[1]);
const dist2 = sqr(viewCenter[0] - x) + sqr(viewCenter[1] - y);
if ((rotateRadius * rotateRadius) > dist2) {
currentManipulator = rotateManipulator;
} else {
currentManipulator = rollManipulator;
}
currentManipulator.setButton(publicAPI.getButton());
currentManipulator.setShift(publicAPI.getShift());
currentManipulator.setControl(publicAPI.getControl());
currentManipulator.setCenter(publicAPI.getCenter());
currentManipulator.onButtonDown(x, y, ren, rwi);
};
publicAPI.onButtonUp = (x, y, ren, rwi) => {
if (currentManipulator) {
currentManipulator.onButtonUp(x, y, ren, rwi);
}
};
publicAPI.onAnimation = (x, y, ren, rwi) => {
if (currentManipulator) {
currentManipulator.onAnimation(x, y, ren, rwi);
}
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Inheritance
vtkCameraManipulator.extend(publicAPI, model, initialValues);
// Object specific methods
vtkTrackballMultiRotate(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkTrackballMultiRotate');
// ----------------------------------------------------------------------------
export default Object.assign({ newInstance, extend });