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import vtkPlane from '@kitware/vtk.js/Common/DataModel/Plane';
import cache from '../cache';
import transformWorldToIndex from '../utilities/transformWorldToIndex';
import type {
Point3,
IVolumeInput,
ActorEntry,
IImageVolume,
OrientationVectors,
} from '../types';
import type { ViewportInput } from '../types/IViewport';
import { RENDERING_DEFAULTS, MPR_CAMERA_VALUES, EPSILON } from '../constants';
import { BlendModes, OrientationAxis } from '../enums';
import BaseVolumeViewport from './BaseVolumeViewport';
import { actorIsA } from '../utilities';
/**
* An object representing a VolumeViewport. VolumeViewports are used to render
* 3D volumes from which various orientations can be viewed. Since VolumeViewports
* use SharedVolumeMappers behind the scene, memory footprint of visualizations
* of the same volume in different orientations is very small.
*
* For setting volumes on viewports you need to use {@link addVolumesToViewports}
* which will add volumes to the specified viewports.
*/
class VolumeViewport extends BaseVolumeViewport {
private _useAcquisitionPlaneForViewPlane = false;
constructor(props: ViewportInput) {
super(props);
const { orientation } = this.options;
// if the camera is set to be acquisition axis then we need to skip
// it for now until the volume is set
Eif (orientation && orientation !== OrientationAxis.ACQUISITION) {
const { viewPlaneNormal, viewUp } =
this._getOrientationVectors(orientation);
const camera = this.getVtkActiveCamera();
camera.setDirectionOfProjection(
-viewPlaneNormal[0],
-viewPlaneNormal[1],
-viewPlaneNormal[2]
);
camera.setViewUpFrom(viewUp);
this.resetCamera();
return;
}
this._useAcquisitionPlaneForViewPlane = true;
}
/**
* Creates volume actors for all volumes defined in the `volumeInputArray`.
* For each entry, if a `callback` is supplied, it will be called with the new volume actor as input.
* For each entry, if a `blendMode` and/or `slabThickness` is defined, this will be set on the actor's
* `VolumeMapper`.
*
* @param volumeInputArray - The array of `VolumeInput`s which define the volumes to add.
* @param immediate - Whether the `Viewport` should be rendered as soon as volumes are added.
*/
public async setVolumes(
volumeInputArray: Array<IVolumeInput>,
immediate = false,
suppressEvents = false
): Promise<void> {
const firstImageVolume = cache.getVolume(volumeInputArray[0].volumeId);
if (!firstImageVolume) {
throw new Error(
`imageVolume with id: ${firstImageVolume.volumeId} does not exist`
);
}
Iif (this._useAcquisitionPlaneForViewPlane) {
this._setViewPlaneToAcquisitionPlane(firstImageVolume);
this._useAcquisitionPlaneForViewPlane = false;
}
return super.setVolumes(volumeInputArray, immediate, suppressEvents);
}
/**
* Creates and adds volume actors for all volumes defined in the `volumeInputArray`.
* For each entry, if a `callback` is supplied, it will be called with the new volume actor as input.
*
* @param volumeInputArray - The array of `VolumeInput`s which define the volumes to add.
* @param immediate - Whether the `Viewport` should be rendered as soon as volumes are added.
*/
public async addVolumes(
volumeInputArray: Array<IVolumeInput>,
immediate = false,
suppressEvents = false
): Promise<void> {
const firstImageVolume = cache.getVolume(volumeInputArray[0].volumeId);
if (!firstImageVolume) {
throw new Error(
`imageVolume with id: ${firstImageVolume.volumeId} does not exist`
);
}
Iif (this._useAcquisitionPlaneForViewPlane) {
this._setViewPlaneToAcquisitionPlane(firstImageVolume);
this._useAcquisitionPlaneForViewPlane = false;
}
return super.addVolumes(volumeInputArray, immediate, suppressEvents);
}
/**
* It sets the orientation for the camera, the orientation can be one of the
* following: axial, sagittal, coronal, default. Use the Enums.OrientationAxis
* to set the orientation. The "default" orientation is the orientation that
* the volume was acquired in (scan axis)
*
* @param orientation - The orientation to set the camera to.
* @param immediate - Whether the `Viewport` should be rendered as soon as the camera is set.
*/
public setOrientation(orientation: OrientationAxis, immediate = true): void {
let viewPlaneNormal, viewUp;
if (MPR_CAMERA_VALUES[orientation]) {
({ viewPlaneNormal, viewUp } = MPR_CAMERA_VALUES[orientation]);
} else if (orientation === 'acquisition') {
({ viewPlaneNormal, viewUp } = this._getAcquisitionPlaneOrientation());
} else {
throw new Error(
`Invalid orientation: ${orientation}. Use Enums.OrientationAxis instead.`
);
}
this.setCamera({
viewPlaneNormal,
viewUp,
});
this.resetCamera();
if (immediate) {
this.render();
}
}
private _getOrientationVectors(
orientation: OrientationAxis | OrientationVectors
): OrientationVectors {
if (typeof orientation === 'object') {
Eif (orientation.viewPlaneNormal && orientation.viewUp) {
return orientation;
} else {
throw new Error(
'Invalid orientation object. It must contain viewPlaneNormal and viewUp'
);
}
} else Eif (
typeof orientation === 'string' &&
MPR_CAMERA_VALUES[orientation]
) {
return MPR_CAMERA_VALUES[orientation];
} else {
throw new Error(
`Invalid orientation: ${orientation}. Valid orientations are: ${Object.keys(
MPR_CAMERA_VALUES
).join(', ')}`
);
}
}
private _getAcquisitionPlaneOrientation(): OrientationVectors {
const actorEntry = this.getDefaultActor();
if (!actorEntry) {
return;
}
// Todo: fix this after we add the volumeId reference to actorEntry later
// in the segmentation refactor
const volumeId = actorEntry.uid;
const imageVolume = cache.getVolume(volumeId);
if (!imageVolume) {
throw new Error(
`imageVolume with id: ${volumeId} does not exist in cache`
);
}
const { direction } = imageVolume;
const viewPlaneNormal = direction.slice(6, 9).map((x) => -x) as Point3;
const viewUp = (direction.slice(3, 6) as Point3).map((x) => -x) as Point3;
return {
viewPlaneNormal,
viewUp,
};
}
private _setViewPlaneToAcquisitionPlane(imageVolume: IImageVolume): void {
let viewPlaneNormal, viewUp;
if (imageVolume) {
const { direction } = imageVolume;
viewPlaneNormal = direction.slice(6, 9).map((x) => -x) as Point3;
viewUp = (direction.slice(3, 6) as Point3).map((x) => -x) as Point3;
} else {
({ viewPlaneNormal, viewUp } = this._getAcquisitionPlaneOrientation());
}
this.setCamera({
viewPlaneNormal,
viewUp,
});
this.resetCamera();
}
/**
* Given a point in world coordinates, return the intensity at that point
* @param point - The point in world coordinates to get the intensity
* from.
* @returns The intensity value of the voxel at the given point.
*/
public getIntensityFromWorld(point: Point3): number {
const actorEntry = this.getDefaultActor();
if (!actorIsA(actorEntry, 'vtkVolume')) {
return;
}
const { actor, uid } = actorEntry;
const imageData = actor.getMapper().getInputData();
const volume = cache.getVolume(uid);
const { dimensions } = volume;
const index = transformWorldToIndex(imageData, point);
const voxelIndex =
index[2] * dimensions[0] * dimensions[1] +
index[1] * dimensions[0] +
index[0];
return volume.scalarData[voxelIndex];
}
public setBlendMode(
blendMode: BlendModes,
filterActorUIDs = [],
immediate = false
): void {
let actorEntries = this.getActors();
if (filterActorUIDs && filterActorUIDs.length > 0) {
actorEntries = actorEntries.filter((actorEntry: ActorEntry) => {
return filterActorUIDs.includes(actorEntry.uid);
});
}
actorEntries.forEach((actorEntry) => {
const { actor } = actorEntry;
const mapper = actor.getMapper();
// @ts-ignore vtk incorrect typing
mapper.setBlendMode(blendMode);
});
if (immediate) {
this.render();
}
}
/**
* Reset the camera for the volume viewport
*/
public resetCamera(
resetPan = true,
resetZoom = true,
resetToCenter = true
): boolean {
super.resetCamera(resetPan, resetZoom, resetToCenter);
this.resetVolumeViewportClippingRange();
const activeCamera = this.getVtkActiveCamera();
const viewPlaneNormal = <Point3>activeCamera.getViewPlaneNormal();
const focalPoint = <Point3>activeCamera.getFocalPoint();
// always add clipping planes for the volume viewport. If a use case
// arises where we don't want clipping planes, you should use the volume_3d
// viewport instead.
const actorEntries = this.getActors();
actorEntries.forEach((actorEntry) => {
Iif (!actorEntry.actor) {
return;
}
const mapper = actorEntry.actor.getMapper();
const vtkPlanes = mapper.getClippingPlanes();
if (vtkPlanes.length === 0) {
const clipPlane1 = vtkPlane.newInstance();
const clipPlane2 = vtkPlane.newInstance();
const newVtkPlanes = [clipPlane1, clipPlane2];
let slabThickness = RENDERING_DEFAULTS.MINIMUM_SLAB_THICKNESS;
Iif (actorEntry.slabThickness) {
slabThickness = actorEntry.slabThickness;
}
this.setOrientationOfClippingPlanes(
newVtkPlanes,
slabThickness,
viewPlaneNormal,
focalPoint
);
mapper.addClippingPlane(clipPlane1);
mapper.addClippingPlane(clipPlane2);
}
});
return true;
}
/**
* It sets the slabThickness of the actors of the viewport. If filterActorUIDs are
* provided, only the actors with the given UIDs will be affected. If no
* filterActorUIDs are provided, all actors will be affected.
*
* @param slabThickness - The slab thickness to set.
* @param blendMode - The blend mode to use when rendering the actors.
* @param filterActorUIDs - Optional argument to filter the actors to apply
* the slab thickness to (if not provided, all actors will be affected).
*/
public setSlabThickness(slabThickness: number, filterActorUIDs = []): void {
let actorEntries = this.getActors();
if (filterActorUIDs && filterActorUIDs.length > 0) {
actorEntries = actorEntries.filter((actorEntry) => {
return filterActorUIDs.includes(actorEntry.uid);
});
}
actorEntries.forEach((actorEntry) => {
if (actorIsA(actorEntry, 'vtkVolume')) {
actorEntry.slabThickness = slabThickness;
}
});
const currentCamera = this.getCamera();
this.updateClippingPlanesForActors(currentCamera);
this.triggerCameraModifiedEventIfNecessary(currentCamera, currentCamera);
}
/**
* Gets the largest slab thickness from all actors in the viewport.
*
* @returns slabThickness - The slab thickness.
*/
public getSlabThickness(): number {
const actors = this.getActors();
let slabThickness = RENDERING_DEFAULTS.MINIMUM_SLAB_THICKNESS;
actors.forEach((actor) => {
Iif (actor.slabThickness > slabThickness) {
slabThickness = actor.slabThickness;
}
});
return slabThickness;
}
/**
* Uses viewport camera and volume actor to decide if the viewport
* is looking at the volume in the direction of acquisition (imageIds).
* If so, it uses the origin and focalPoint to calculate the slice index.
* Todo: This only works if the imageIds are properly sorted
*
* @returns The slice index
*/
public getCurrentImageIdIndex = (): number | undefined => {
return this._getImageIdIndex();
};
/**
* Uses viewport camera and volume actor to decide if the viewport
* is looking at the volume in the direction of acquisition (imageIds).
* If so, it uses the origin and focalPoint to find which imageId is
* currently being viewed.
*
* @returns ImageId
*/
public getCurrentImageId = (): string | undefined => {
const index = this._getImageIdIndex();
if (isNaN(index)) {
return;
}
const actorEntry = this.getDefaultActor();
if (!actorIsA(actorEntry, 'vtkVolume')) {
return;
}
const { uid } = actorEntry;
const volume = cache.getVolume(uid);
if (!volume) {
return;
}
const imageIds = volume.imageIds;
return imageIds[index];
};
private _getImageIdIndex = () => {
const { viewPlaneNormal, focalPoint } = this.getCamera();
// Todo: handle scenario of fusion of multiple volumes
// we cannot only check number of actors, because we might have
// segmentations ...
const { direction, origin, spacing } = this.getImageData();
// get the last 3 components of the direction - axis normal
const dir = direction.slice(direction.length - 3);
const dot = Math.abs(
dir[0] * viewPlaneNormal[0] +
dir[1] * viewPlaneNormal[1] +
dir[2] * viewPlaneNormal[2]
);
// if dot is not 1 or -1 return null since it means
// viewport is not looking at the image acquisition plane
if (dot - 1 > EPSILON) {
return;
}
// how many steps are from the origin to the focal point in the
// normal direction
const spacingInNormal = spacing[2];
const sub = vec3.create();
vec3.sub(sub, focalPoint, origin);
const distance = vec3.dot(sub, viewPlaneNormal);
// divide by the spacing in the normal direction to get the
// number of steps, and subtract 1 to get the index
return Math.round(Math.abs(distance) / spacingInNormal);
};
}
export default VolumeViewport;
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