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import vtkPlane from '@kitware/vtk.js/Common/DataModel/Plane';
import vtkVolume from '@kitware/vtk.js/Rendering/Core/Volume';
import cache from '../cache';
import ViewportType from '../enums/ViewportType';
import Viewport from './Viewport';
import { createVolumeActor } from './helpers';
import volumeNewImageEventDispatcher, {
resetVolumeNewImageState,
} from './helpers/volumeNewImageEventDispatcher';
import { loadVolume } from '../volumeLoader';
import vtkSlabCamera from './vtkClasses/vtkSlabCamera';
import { getShouldUseCPURendering } from '../init';
import transformWorldToIndex from '../utilities/transformWorldToIndex';
import type {
Point2,
Point3,
IImageData,
IVolumeInput,
ActorEntry,
IImageVolume,
FlipDirection,
VolumeViewportProperties,
OrientationVectors,
} from '../types';
import type { ViewportInput } from '../types/IViewport';
import type IVolumeViewport from '../types/IVolumeViewport';
import { RENDERING_DEFAULTS } from '../constants';
import { Events, BlendModes, OrientationAxis } from '../enums';
import eventTarget from '../eventTarget';
import type { vtkSlabCamera as vtkSlabCameraType } from './vtkClasses/vtkSlabCamera';
import { imageIdToURI, triggerEvent } from '../utilities';
import { VoiModifiedEventDetail } from '../types/EventTypes';
import deepFreeze from '../utilities/deepFreeze';
const EPSILON = 1e-3;
const ORIENTATION = {
axial: {
viewPlaneNormal: <Point3>[0, 0, -1],
viewUp: <Point3>[0, -1, 0],
},
sagittal: {
viewPlaneNormal: <Point3>[1, 0, 0],
viewUp: <Point3>[0, 0, 1],
},
coronal: {
viewPlaneNormal: <Point3>[0, 1, 0],
viewUp: <Point3>[0, 0, 1],
},
};
// Note: Object.freeze is only shallow, so we need to deepFreeze
deepFreeze(ORIENTATION);
/**
* 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 Viewport implements IVolumeViewport {
useCPURendering = false;
private _FrameOfReferenceUID: string;
private _useAcquisitionPlaneForViewPlane = false;
constructor(props: ViewportInput) {
super(props);
this.useCPURendering = getShouldUseCPURendering();
Iif (this.useCPURendering) {
throw new Error(
'VolumeViewports cannot be used whilst CPU Fallback Rendering is enabled.'
);
}
const renderer = this.getRenderer();
const camera = vtkSlabCamera.newInstance();
renderer.setActiveCamera(camera);
switch (this.type) {
case ViewportType.ORTHOGRAPHIC:
camera.setParallelProjection(true);
break;
case ViewportType.PERSPECTIVE:
camera.setParallelProjection(false);
break;
default:
throw new Error(`Unrecognized viewport type: ${this.type}`);
}
this.initializeVolumeNewImageEventDispatcher();
const { orientation } = this.options;
Eif (orientation) {
const { viewPlaneNormal, viewUp } =
this._getOrientationVectors(orientation);
camera.setDirectionOfProjection(
-viewPlaneNormal[0],
-viewPlaneNormal[1],
-viewPlaneNormal[2]
);
camera.setViewUpFrom(viewUp);
this.resetCamera();
return;
}
this._useAcquisitionPlaneForViewPlane = true;
}
static get useCustomRenderingPipeline(): boolean {
return false;
}
private initializeVolumeNewImageEventDispatcher(): void {
const volumeNewImageHandlerBound = volumeNewImageHandler.bind(this);
const volumeNewImageCleanUpBound = volumeNewImageCleanUp.bind(this);
function volumeNewImageHandler(cameraEvent) {
const viewportImageData = this.getImageData();
if (!viewportImageData) {
return;
}
volumeNewImageEventDispatcher(cameraEvent);
}
function volumeNewImageCleanUp(evt) {
const { viewportId } = evt.detail;
if (viewportId !== this.id) {
return;
}
this.element.removeEventListener(
Events.CAMERA_MODIFIED,
volumeNewImageHandlerBound
);
eventTarget.removeEventListener(
Events.ELEMENT_DISABLED,
volumeNewImageCleanUpBound
);
resetVolumeNewImageState(viewportId);
}
this.element.removeEventListener(
Events.CAMERA_MODIFIED,
volumeNewImageHandlerBound
);
this.element.addEventListener(
Events.CAMERA_MODIFIED,
volumeNewImageHandlerBound
);
eventTarget.addEventListener(
Events.ELEMENT_DISABLED,
volumeNewImageCleanUpBound
);
}
/**
* Sets the properties for the volume viewport on the volume
* (if fusion, it sets it for the first volume in the fusion)
*
* @param voiRange - Sets the lower and upper voi
* @param volumeId - The volume id to set the properties for (if undefined, the first volume)
* @param suppressEvents - If true, the viewport will not emit events
*/
public setProperties(
{ voiRange }: VolumeViewportProperties = {},
volumeId?: string,
suppressEvents = false
): void {
if (volumeId !== undefined && !this.getActor(volumeId)) {
return;
}
const actorEntries = this.getActors();
Iif (!actorEntries.length) {
return;
}
let volumeActor;
Eif (volumeId) {
const actorEntry = actorEntries.find((entry: ActorEntry) => {
return entry.uid === volumeId;
});
volumeActor = actorEntry?.actor as vtkVolume;
}
// // set it for the first volume (if there are more than one - fusion)
Iif (!volumeActor) {
volumeActor = actorEntries[0].actor as vtkVolume;
volumeId = actorEntries[0].uid;
}
Iif (!voiRange) {
return;
}
// Todo: later when we have more properties, refactor the setVoiRange code below
const { lower, upper } = voiRange;
volumeActor.getProperty().getRGBTransferFunction(0).setRange(lower, upper);
Eif (!suppressEvents) {
const eventDetail: VoiModifiedEventDetail = {
viewportId: this.id,
range: voiRange,
volumeId: volumeId,
};
triggerEvent(this.element, Events.VOI_MODIFIED, eventDetail);
}
}
/**
* 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;
}
const FrameOfReferenceUID = firstImageVolume.metadata.FrameOfReferenceUID;
await this._isValidVolumeInputArray(volumeInputArray, FrameOfReferenceUID);
this._FrameOfReferenceUID = FrameOfReferenceUID;
const volumeActors = [];
// One actor per volume
for (let i = 0; i < volumeInputArray.length; i++) {
const { volumeId, actorUID, slabThickness } = volumeInputArray[i];
const actor = await createVolumeActor(
volumeInputArray[i],
this.element,
this.id,
suppressEvents
);
// We cannot use only volumeId since then we cannot have for instance more
// than one representation of the same volume (since actors would have the
// same name, and we don't allow that) AND We cannot use only any uid, since
// we rely on the volume in the cache for mapper. So we prefer actorUID if
// it is defined, otherwise we use volumeId for the actor name.
const uid = actorUID || volumeId;
volumeActors.push({
uid,
actor,
slabThickness,
});
}
this._setVolumeActors(volumeActors);
Iif (immediate) {
this.render();
}
}
/**
* 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;
}
const volumeActors = [];
await this._isValidVolumeInputArray(
volumeInputArray,
this._FrameOfReferenceUID
);
// One actor per volume
for (let i = 0; i < volumeInputArray.length; i++) {
const { volumeId, visibility, actorUID, slabThickness } =
volumeInputArray[i];
const actor = await createVolumeActor(
volumeInputArray[i],
this.element,
this.id,
suppressEvents
);
Iif (visibility === false) {
actor.setVisibility(false);
}
// We cannot use only volumeId since then we cannot have for instance more
// than one representation of the same volume (since actors would have the
// same name, and we don't allow that) AND We cannot use only any uid, since
// we rely on the volume in the cache for mapper. So we prefer actorUID if
// it is defined, otherwise we use volumeId for the actor name.
const uid = actorUID || volumeId;
volumeActors.push({
uid,
actor,
slabThickness,
});
}
this.addActors(volumeActors);
Iif (immediate) {
// render
this.render();
}
}
/**
* It removes the volume actor from the Viewport. If the volume actor is not in
* the viewport, it does nothing.
* @param actorUIDs - Array of actor UIDs to remove. In case of simple volume it will
* be the volume Id, but in case of Segmentation it will be `{volumeId}-{representationType}`
* since the same volume can be rendered in multiple representations.
* @param immediate - If true, the Viewport will be rendered immediately
*/
public removeVolumeActors(actorUIDs: Array<string>, immediate = false): void {
// Todo: This is actually removeActors
this.removeActors(actorUIDs);
if (immediate) {
this.render();
}
}
/**
* 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 (Object.keys(ORIENTATION).includes(orientation)) {
({ viewPlaneNormal, viewUp } = ORIENTATION[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' &&
Object.keys(ORIENTATION).includes(orientation)
) {
return ORIENTATION[orientation];
} else if (orientation === 'acquisition') {
return this._getAcquisitionPlaneOrientation();
} else {
throw new Error(
`Invalid orientation: ${orientation}. Valid orientations are: ${Object.keys(
ORIENTATION
).join(', ')}`
);
}
}
private _getAcquisitionPlaneOrientation(): OrientationVectors {
const actorEntry = this.getDefaultActor();
if (!actorEntry) {
throw new Error(
'Cannot get acquisition plane orientation, no actor in viewport'
);
}
// 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();
}
Eprivate async _isValidVolumeInputArray(
volumeInputArray: Array<IVolumeInput>,
FrameOfReferenceUID: string
): Promise<boolean> {
const numVolumes = volumeInputArray.length;
// Check all other volumes exist and have the same FrameOfReference
for (let i = 1; i < numVolumes; i++) {
const volumeInput = volumeInputArray[i];
const imageVolume = await loadVolume(volumeInput.volumeId);
if (!imageVolume) {
throw new Error(
`imageVolume with id: ${imageVolume.volumeId} does not exist`
);
}
if (FrameOfReferenceUID !== imageVolume.metadata.FrameOfReferenceUID) {
throw new Error(
`Volumes being added to viewport ${this.id} do not share the same FrameOfReferenceUID. This is not yet supported`
);
}
}
return true;
}
/**
* 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 { actor, uid } = this.getDefaultActor();
if (!actor.isA('vtkVolume')) {
return;
}
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];
}
/**
* gets the visible bounds of the viewport in the world coordinate system
*/
public getBounds(): number[] {
const renderer = this.getRenderer();
const bounds = renderer.computeVisiblePropBounds();
return bounds;
}
/**
* Flip the viewport along the desired axis
* @param flipDirection - FlipDirection
*/
public flip(flipDirection: FlipDirection): void {
super.flip(flipDirection);
}
/**
* Reset the camera for the volume viewport
*/
public resetCamera(resetPan = true, resetZoom = true): boolean {
super.resetCamera(resetPan, resetZoom);
const activeCamera = this.getVtkActiveCamera();
// Set large numbers to ensure everything is always rendered
Eif (activeCamera.getParallelProjection()) {
activeCamera.setClippingRange(
-RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE,
RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE
);
} else {
activeCamera.setClippingRange(
RENDERING_DEFAULTS.MINIMUM_SLAB_THICKNESS,
RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE
);
}
const viewPlaneNormal = <Point3>activeCamera.getViewPlaneNormal();
const focalPoint = <Point3>activeCamera.getFocalPoint();
const actorEntries = this.getActors();
actorEntries.forEach((actorEntry) => {
// we assume that the first two clipping plane of the mapper are always
// the 'camera' clipping. Add clipping planes only if the actor is
// a vtkVolume
if (!actorEntry.actor || !actorEntry.actor.isA('vtkVolume')) {
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;
}
public getFrameOfReferenceUID = (): string => {
return this._FrameOfReferenceUID;
};
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();
}
}
/**
* 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) => {
const { actor } = actorEntry;
if (actor.isA('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;
}
/**
* Checks if the viewport has a volume actor with the given volumeId
* @param volumeId - the volumeId to look for
* @returns Boolean indicating if the volume is present in the viewport
*/
public hasVolumeId(volumeId: string): boolean {
// Note: this assumes that the uid of the volume is the same as the volumeId
// which is not guaranteed to be the case for SEG.
const actorEntries = this.getActors();
return actorEntries.some((actorEntry) => {
return actorEntry.uid === volumeId;
});
}
/**
* Returns the image and its properties that is being shown inside the
* stack viewport. It returns, the image dimensions, image direction,
* image scalar data, vtkImageData object, metadata, and scaling (e.g., PET suvbw)
* Note: since the volume viewport supports fusion, to get the
* image data for a specific volume, use the optional volumeId
* argument.
*
* @param volumeId - The volumeId of the volume to get the image for.
* @returns IImageData: {dimensions, direction, scalarData, vtkImageData, metadata, scaling}
*/
public getImageData(volumeId?: string): IImageData | undefined {
const defaultActor = this.getDefaultActor();
if (!defaultActor) {
return;
}
const { uid: defaultActorUID } = defaultActor;
volumeId = volumeId ?? defaultActorUID;
const { actor } = this.getActor(volumeId);
if (!actor.isA('vtkVolume')) {
return;
}
const volume = cache.getVolume(volumeId);
const vtkImageData = actor.getMapper().getInputData();
return {
dimensions: vtkImageData.getDimensions(),
spacing: vtkImageData.getSpacing(),
origin: vtkImageData.getOrigin(),
direction: vtkImageData.getDirection(),
scalarData: vtkImageData.getPointData().getScalars().getData(),
imageData: actor.getMapper().getInputData(),
metadata: {
Modality: volume.metadata.Modality,
},
scaling: undefined,
hasPixelSpacing: true,
};
}
/**
* Attaches the volume actors to the viewport.
*
* @param volumeActorEntries - The volume actors to add the viewport.
*
*/
private _setVolumeActors(volumeActorEntries: Array<ActorEntry>): void {
this.setActors(volumeActorEntries);
}
/**
* canvasToWorld Returns the world coordinates of the given `canvasPos`
* projected onto the plane defined by the `Viewport`'s `vtkCamera`'s focal point
* and the direction of projection.
*
* @param canvasPos - The position in canvas coordinates.
* @returns The corresponding world coordinates.
* @public
*/
public canvasToWorld = (canvasPos: Point2): Point3 => {
const vtkCamera = this.getVtkActiveCamera() as vtkSlabCameraType;
/**
* NOTE: this is necessary because we want the coordinate trasformation
* respect to the view plane (plane orthogonal to the camera and passing to
* the focal point).
*
* When vtk.js computes the coordinate transformations, it simply uses the
* camera matrix (no ray casting).
*
* However for the volume viewport the clipping range is set to be
* (-RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE, RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE).
* The clipping range is used in the camera method getProjectionMatrix().
* The projection matrix is used then for viewToWorld/worldToView methods of
* the renderer. This means that vkt.js will not return the coordinates of
* the point on the view plane (i.e. the depth coordinate will correspond
* to the focal point).
*
* Therefore the clipping range has to be set to (distance, distance + 0.01),
* where now distance is the distance between the camera position and focal
* point. This is done internally, in our camera customization when the flag
* isPerformingCoordinateTransformation is set to true.
*/
vtkCamera.setIsPerformingCoordinateTransformation(true);
const renderer = this.getRenderer();
const offscreenMultiRenderWindow =
this.getRenderingEngine().offscreenMultiRenderWindow;
const openGLRenderWindow =
offscreenMultiRenderWindow.getOpenGLRenderWindow();
const size = openGLRenderWindow.getSize();
const devicePixelRatio = window.devicePixelRatio || 1;
const canvasPosWithDPR = [
canvasPos[0] * devicePixelRatio,
canvasPos[1] * devicePixelRatio,
];
const displayCoord = [
canvasPosWithDPR[0] + this.sx,
canvasPosWithDPR[1] + this.sy,
];
// The y axis display coordinates are inverted with respect to canvas coords
displayCoord[1] = size[1] - displayCoord[1];
let worldCoord = openGLRenderWindow.displayToWorld(
displayCoord[0],
displayCoord[1],
0,
renderer
);
vtkCamera.setIsPerformingCoordinateTransformation(false);
worldCoord = this.applyFlipTx(worldCoord);
return worldCoord;
};
/**
* Returns the canvas coordinates of the given `worldPos`
* projected onto the `Viewport`'s `canvas`.
*
* @param worldPos - The position in world coordinates.
* @returns The corresponding canvas coordinates.
* @public
*/
public worldToCanvas = (worldPos: Point3): Point2 => {
const vtkCamera = this.getVtkActiveCamera() as vtkSlabCameraType;
/**
* NOTE: this is necessary because we want the coordinate trasformation
* respect to the view plane (plane orthogonal to the camera and passing to
* the focal point).
*
* When vtk.js computes the coordinate transformations, it simply uses the
* camera matrix (no ray casting).
*
* However for the volume viewport the clipping range is set to be
* (-RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE, RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE).
* The clipping range is used in the camera method getProjectionMatrix().
* The projection matrix is used then for viewToWorld/worldToView methods of
* the renderer. This means that vkt.js will not return the coordinates of
* the point on the view plane (i.e. the depth coordinate will corresponded
* to the focal point).
*
* Therefore the clipping range has to be set to (distance, distance + 0.01),
* where now distance is the distance between the camera position and focal
* point. This is done internally, in our camera customization when the flag
* isPerformingCoordinateTransformation is set to true.
*/
vtkCamera.setIsPerformingCoordinateTransformation(true);
const renderer = this.getRenderer();
const offscreenMultiRenderWindow =
this.getRenderingEngine().offscreenMultiRenderWindow;
const openGLRenderWindow =
offscreenMultiRenderWindow.getOpenGLRenderWindow();
const size = openGLRenderWindow.getSize();
const displayCoord = openGLRenderWindow.worldToDisplay(
...this.applyFlipTx(worldPos),
renderer
);
// The y axis display coordinates are inverted with respect to canvas coords
displayCoord[1] = size[1] - displayCoord[1];
const canvasCoord = <Point2>[
displayCoord[0] - this.sx,
displayCoord[1] - this.sy,
];
const devicePixelRatio = window.devicePixelRatio || 1;
const canvasCoordWithDPR = <Point2>[
canvasCoord[0] / devicePixelRatio,
canvasCoord[1] / devicePixelRatio,
];
vtkCamera.setIsPerformingCoordinateTransformation(false);
return canvasCoordWithDPR;
};
/**
* 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();
};
/*
* Checking if the imageURI is in the volumes that are being
* rendered by the viewport. imageURI is the imageId without the schema
* for instance for the imageId of streaming-wadors:http://..., the http://... is the imageURI.
* Why we don't check the imageId is because the same image can be shown in
* another viewport (StackViewport) with a different schema
*
* @param imageURI - The imageURI to check
* @returns True if the imageURI is in the volumes that are being rendered by the viewport
*/
public hasImageURI = (imageURI: string): boolean => {
const volumeActors = this.getActors().filter(({ actor }) =>
actor.isA('vtkVolume')
);
return volumeActors.some(({ uid }) => {
const volume = cache.getVolume(uid);
if (!volume || !volume.imageIds) {
return false;
}
const volumeImageURIs = volume.imageIds.map(imageIdToURI);
return volumeImageURIs.includes(imageURI);
});
};
/**
* 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 (!index) {
return;
}
const { uid, actor } = this.getDefaultActor();
if (!actor.isA('vtkVolume')) {
return;
}
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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