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import vtkColorTransferFunction from '@kitware/vtk.js/Rendering/Core/ColorTransferFunction';
import vtkColorMaps from '@kitware/vtk.js/Rendering/Core/ColorTransferFunction/ColorMaps';
import vtkPiecewiseFunction from '@kitware/vtk.js/Common/DataModel/PiecewiseFunction';
import { vec2, vec3 } from 'gl-matrix';
import cache from '../cache';
import {
MPR_CAMERA_VALUES,
RENDERING_DEFAULTS,
VIEWPORT_PRESETS,
} from '../constants';
import {
BlendModes,
Events,
InterpolationType,
OrientationAxis,
ViewportStatus,
VOILUTFunctionType,
} from '../enums';
import ViewportType from '../enums/ViewportType';
import eventTarget from '../eventTarget';
import { getShouldUseCPURendering } from '../init';
import { loadVolume } from '../loaders/volumeLoader';
import type {
ActorEntry,
ColormapPublic,
FlipDirection,
IImageData,
IVolumeInput,
OrientationVectors,
Point2,
Point3,
VOIRange,
EventTypes,
VolumeViewportProperties,
ViewReferenceSpecifier,
ReferenceCompatibleOptions,
} from '../types';
import { VoiModifiedEventDetail } from '../types/EventTypes';
import type { ViewportInput } from '../types/IViewport';
import type IVolumeViewport from '../types/IVolumeViewport';
import type { ViewReference } from '../types/IViewport';
import {
actorIsA,
applyPreset,
createSigmoidRGBTransferFunction,
getVoiFromSigmoidRGBTransferFunction,
imageIdToURI,
invertRgbTransferFunction,
triggerEvent,
colormap as colormapUtils,
} from '../utilities';
import { createVolumeActor } from './helpers';
import volumeNewImageEventDispatcher, {
resetVolumeNewImageState,
} from './helpers/volumeNewImageEventDispatcher';
import Viewport from './Viewport';
import type { vtkSlabCamera as vtkSlabCameraType } from './vtkClasses/vtkSlabCamera';
import vtkSlabCamera from './vtkClasses/vtkSlabCamera';
import transformWorldToIndex from '../utilities/transformWorldToIndex';
import { findMatchingColormap } from '../utilities/colormap';
import { getTransferFunctionNodes } from '../utilities/transferFunctionUtils';
/**
* Abstract base class for volume viewports. 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.
*/
abstract class BaseVolumeViewport extends Viewport implements IVolumeViewport {
useCPURendering = false;
useNativeDataType = false;
private _FrameOfReferenceUID: string;
protected initialTransferFunctionNodes: any;
// Viewport Properties
private globalDefaultProperties: VolumeViewportProperties;
private perVolumeIdDefaultProperties = new Map<
string,
VolumeViewportProperties
>();
// Camera properties
protected initialViewUp: Point3;
protected viewportProperties: VolumeViewportProperties = {};
constructor(props: ViewportInput) {
super(props);
this.useCPURendering = getShouldUseCPURendering();
this.useNativeDataType = this._shouldUseNativeDataType();
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.VOLUME_3D:
camera.setParallelProjection(true);
break;
case ViewportType.PERSPECTIVE:
camera.setParallelProjection(false);
break;
default:
throw new Error(`Unrecognized viewport type: ${this.type}`);
}
this.initializeVolumeNewImageEventDispatcher();
}
static get useCustomRenderingPipeline(): boolean {
return false;
}
protected applyViewOrientation(
orientation: OrientationAxis | OrientationVectors
) {
const { viewPlaneNormal, viewUp } =
this._getOrientationVectors(orientation);
const camera = this.getVtkActiveCamera();
camera.setDirectionOfProjection(
-viewPlaneNormal[0],
-viewPlaneNormal[1],
-viewPlaneNormal[2]
);
camera.setViewUpFrom(viewUp);
this.initialViewUp = viewUp;
this.resetCamera();
}
private initializeVolumeNewImageEventDispatcher(): void {
const volumeNewImageHandlerBound = volumeNewImageHandler.bind(this);
const volumeNewImageCleanUpBound = volumeNewImageCleanUp.bind(this);
function volumeNewImageHandler(cameraEvent) {
const { viewportId } = cameraEvent.detail;
Iif (viewportId !== this.id || this.isDisabled) {
return;
}
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
);
}
protected resetVolumeViewportClippingRange() {
const activeCamera = this.getVtkActiveCamera();
if (activeCamera.getParallelProjection()) {
activeCamera.setClippingRange(
-RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE,
RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE
);
} else E{
activeCamera.setClippingRange(
RENDERING_DEFAULTS.MINIMUM_SLAB_THICKNESS,
RENDERING_DEFAULTS.MAXIMUM_RAY_DISTANCE
);
}
}
/**
* Sets the properties for the volume viewport on the volume
* Sets the VOILUTFunction property for the volume viewport on the volume
*
* @param VOILUTFunction - Sets the voi mode (LINEAR or SAMPLED_SIGMOID)
* @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
*/
private setVOILUTFunction(
voiLUTFunction: VOILUTFunctionType,
volumeId?: string,
suppressEvents?: boolean
): void {
// make sure the VOI LUT function is valid in the VOILUTFunctionType which is enum
if (Object.values(VOILUTFunctionType).indexOf(voiLUTFunction) === -1) {
voiLUTFunction = VOILUTFunctionType.LINEAR;
}
const { voiRange } = this.getProperties();
this.setVOI(voiRange, volumeId, suppressEvents);
this.viewportProperties.VOILUTFunction = voiLUTFunction;
}
/**
* Sets the colormap for the volume with the given ID and optionally suppresses events.
*
* @param colormap - The colormap to apply (e.g., "hsv").
* @param volumeId - The ID of the volume to set the colormap for.
* @param suppressEvents - If `true`, events will not be emitted during the colormap a
*
* @returns void
*/
private setColormap(
colormap: ColormapPublic,
volumeId: string,
suppressEvents?: boolean
) {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
Iif (!applicableVolumeActorInfo) {
return;
}
const { volumeActor } = applicableVolumeActorInfo;
const cfun = vtkColorTransferFunction.newInstance();
let colormapObj = colormapUtils.getColormap(colormap.name);
const { name } = colormap;
Eif (!colormapObj) {
colormapObj = vtkColorMaps.getPresetByName(name);
}
Iif (!colormapObj) {
throw new Error(`Colormap ${colormap} not found`);
}
const range = volumeActor
.getProperty()
.getRGBTransferFunction(0)
.getRange();
cfun.applyColorMap(colormapObj);
cfun.setMappingRange(range[0], range[1]);
volumeActor.getProperty().setRGBTransferFunction(0, cfun);
// This configures the viewport to use the most recently applied colormap.
// However, this approach is not optimal when dealing with two volumes, as it prevents retrieval of the
// colormap for Volume A if Volume B's colormap was the last one applied.
this.viewportProperties.colormap = colormap;
Eif (!suppressEvents) {
const eventDetail = {
viewportId: this.id,
colormap,
volumeId,
};
triggerEvent(this.element, Events.COLORMAP_MODIFIED, eventDetail);
}
}
/**
* Sets the opacity for the volume with the given ID.
*
* @param colormap - An object containing opacity that can be a number or an array of OpacityMapping
* @param volumeId - The ID of the volume to set the opacity for.
*
* @returns void
*/
private setOpacity(colormap: ColormapPublic, volumeId: string) {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
if (!applicableVolumeActorInfo) {
return;
}
const { volumeActor } = applicableVolumeActorInfo;
const ofun = vtkPiecewiseFunction.newInstance();
if (typeof colormap.opacity === 'number') {
const range = volumeActor
.getProperty()
.getRGBTransferFunction(0)
.getRange();
ofun.addPoint(range[0], colormap.opacity);
ofun.addPoint(range[1], colormap.opacity);
} else {
colormap.opacity.forEach(({ opacity, value }) => {
ofun.addPoint(value, opacity);
});
}
volumeActor.getProperty().setScalarOpacity(0, ofun);
if (!this.viewportProperties.colormap) {
this.viewportProperties.colormap = {};
}
this.viewportProperties.colormap.opacity = colormap.opacity;
}
/**
* Sets the inversion for the volume transfer function
*
* @param inverted - Should the transfer function be inverted?
* @param volumeId - volumeId
* @param suppressEvents - If `true`, events will not be published
*
* @returns void
*/
private setInvert(
inverted: boolean,
volumeId?: string,
suppressEvents?: boolean
) {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
Iif (!applicableVolumeActorInfo) {
return;
}
const volumeIdToUse = applicableVolumeActorInfo.volumeId;
const cfun = this._getOrCreateColorTransferFunction(volumeIdToUse);
invertRgbTransferFunction(cfun);
this.viewportProperties.invert = inverted;
Eif (!suppressEvents) {
const eventDetail: VoiModifiedEventDetail = {
...this.getVOIModifiedEventDetail(volumeIdToUse),
invertStateChanged: true,
};
triggerEvent(this.element, Events.VOI_MODIFIED, eventDetail);
}
}
protected getVOIModifiedEventDetail(
volumeId: string
): VoiModifiedEventDetail {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
Iif (!applicableVolumeActorInfo) {
throw new Error(`No actor found for the given volumeId: ${volumeId}`);
}
const volumeActor = applicableVolumeActorInfo.volumeActor;
const transferFunction = volumeActor
.getProperty()
.getRGBTransferFunction(0);
const range = transferFunction.getMappingRange();
const matchedColormap = this.getColormap(volumeId);
const { VOILUTFunction, invert } = this.getProperties(volumeId);
return {
viewportId: this.id,
range: {
lower: range[0],
upper: range[1],
},
volumeId: applicableVolumeActorInfo.volumeId,
VOILUTFunction: VOILUTFunction,
colormap: matchedColormap,
invert,
};
}
private _getOrCreateColorTransferFunction(
volumeId: string
): vtkColorTransferFunction {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
if (!applicableVolumeActorInfo) {
return null;
}
const { volumeActor } = applicableVolumeActorInfo;
const rgbTransferFunction = volumeActor
.getProperty()
.getRGBTransferFunction(0);
Eif (rgbTransferFunction) {
return rgbTransferFunction;
}
const newRGBTransferFunction = vtkColorTransferFunction.newInstance();
volumeActor.getProperty().setRGBTransferFunction(0, newRGBTransferFunction);
return newRGBTransferFunction;
}
protected setInterpolationType(
interpolationType: InterpolationType,
volumeId?: string
) {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
if (!applicableVolumeActorInfo) {
return;
}
const { volumeActor } = applicableVolumeActorInfo;
const volumeProperty = volumeActor.getProperty();
// @ts-ignore
volumeProperty.setInterpolationType(interpolationType);
this.viewportProperties.interpolationType = interpolationType;
}
/**
* 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
*/
private setVOI(
voiRange: VOIRange,
volumeId?: string,
suppressEvents = false
): void {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
if (!applicableVolumeActorInfo) {
return;
}
const { volumeActor } = applicableVolumeActorInfo;
const volumeIdToUse = applicableVolumeActorInfo.volumeId;
let voiRangeToUse = voiRange;
Iif (typeof voiRangeToUse === 'undefined') {
const imageData = volumeActor.getMapper().getInputData();
const range = imageData.getPointData().getScalars().getRange();
const maxVoiRange = { lower: range[0], upper: range[1] };
voiRangeToUse = maxVoiRange;
}
const { VOILUTFunction } = this.getProperties(volumeIdToUse);
// scaling logic here
// https://github.com/Kitware/vtk-js/blob/c6f2e12cddfe5c0386a73f0793eb6d9ab20d573e/Sources/Rendering/OpenGL/VolumeMapper/index.js#L957-L972
Iif (VOILUTFunction === VOILUTFunctionType.SAMPLED_SIGMOID) {
const cfun = createSigmoidRGBTransferFunction(voiRangeToUse);
volumeActor.getProperty().setRGBTransferFunction(0, cfun);
} else {
// TODO: refactor and make it work for PET series (inverted/colormap)
// const cfun = createLinearRGBTransferFunction(voiRangeToUse);
// volumeActor.getProperty().setRGBTransferFunction(0, cfun);
// Todo: Moving from LINEAR to SIGMOID and back to LINEAR will not
// work until we implement it in a different way because the
// LINEAR transfer function is not recreated.
const { lower, upper } = voiRangeToUse;
volumeActor
.getProperty()
.getRGBTransferFunction(0)
.setRange(lower, upper);
}
Eif (!suppressEvents) {
const eventDetail: VoiModifiedEventDetail = {
...this.getVOIModifiedEventDetail(volumeIdToUse),
};
triggerEvent(this.element, Events.VOI_MODIFIED, eventDetail);
}
this.viewportProperties.voiRange = voiRangeToUse;
}
protected setRotation = (rotation: number) => {
const panFit = this.getPan(this.fitToCanvasCamera);
const pan = this.getPan();
const previousCamera = this.getCamera();
const panSub = vec2.sub([0, 0], panFit, pan) as Point2;
this.setPan(panSub, false);
const { flipVertical } = this.getCamera();
// Moving back to zero rotation, for new scrolled slice rotation is 0 after camera reset
const initialViewUp = flipVertical
? vec3.negate([0, 0, 0], this.initialViewUp)
: this.initialViewUp;
this.setCameraNoEvent({
viewUp: initialViewUp as Point3,
});
// rotating camera to the new value
this.rotateCamera(rotation);
const afterPan = this.getPan();
const afterPanFit = this.getPan(this.fitToCanvasCamera);
const newCenter = vec2.sub([0, 0], afterPan, afterPanFit);
const newOffset = vec2.add([0, 0], panFit, newCenter) as Point2;
this.setPan(newOffset, false);
if (this._suppressCameraModifiedEvents) {
return;
}
// New camera after rotation
const camera = this.getCamera();
const eventDetail: EventTypes.CameraModifiedEventDetail = {
previousCamera,
camera,
element: this.element,
viewportId: this.id,
renderingEngineId: this.renderingEngineId,
rotation,
};
triggerEvent(this.element, Events.CAMERA_MODIFIED, eventDetail);
this.viewportProperties.rotation = rotation;
};
private rotateCamera(rotation: number): void {
const rotationToApply = rotation - this.getRotation();
// rotating camera to the new value
this.getVtkActiveCamera().roll(-rotationToApply);
}
/**
* Update the default properties for the volume viewport on the volume
* @param ViewportProperties - The properties to set
* @param volumeId - The volume id to set the default properties for (if undefined, we set the global default viewport properties)
*/
public setDefaultProperties(
ViewportProperties: VolumeViewportProperties,
volumeId?: string
): void {
if (volumeId == null) {
this.globalDefaultProperties = ViewportProperties;
} else E{
this.perVolumeIdDefaultProperties.set(volumeId, ViewportProperties);
}
}
/**
* Remove the global default properties of the viewport or remove default properties for a volumeId if specified
* @param volumeId If given, we remove the default properties only for this volumeId, if not
* the global default properties will be removed
*/
public clearDefaultProperties(volumeId?: string): void {
if (volumeId == null) {
this.globalDefaultProperties = {};
this.resetProperties();
} else {
this.perVolumeIdDefaultProperties.delete(volumeId);
this.resetToDefaultProperties(volumeId);
}
}
/**
* Gets a view target, allowing comparison between view positions as well
* as restoring views later.
*/
public getViewReference(
viewRefSpecifier: ViewReferenceSpecifier = {}
): ViewReference {
const target = super.getViewReference(viewRefSpecifier);
Eif (viewRefSpecifier?.forFrameOfReference !== false) {
target.volumeId = this.getVolumeId(viewRefSpecifier);
}
// TODO - add referencedImageId as a base URL for an image to allow a generic
// method to specify which volumes this should apply to.
return {
...target,
sliceIndex: this.getCurrentImageIdIndex(),
};
}
/**
* Find out if this viewport would show this view
*
* @param options - allows specifying whether the view COULD display this with
* some modification - either navigation or displaying as volume.
* @returns true if the target is compatible with this view
*/
public isReferenceViewable(
viewRef: ViewReference,
options?: ReferenceCompatibleOptions
): boolean {
if (!super.isReferenceViewable(viewRef, options)) {
return false;
}
if (options?.withNavigation) {
return true;
}
const currentSliceIndex = this.getCurrentImageIdIndex();
const { sliceIndex } = viewRef;
if (Array.isArray(sliceIndex)) {
return (
sliceIndex[0] <= currentSliceIndex && currentSliceIndex <= sliceIndex[1]
);
}
return sliceIndex === undefined || sliceIndex === currentSliceIndex;
}
/**
* Sets the properties for the volume viewport on the volume
* and if setProperties is called for the first time, the properties will also become the default one.
* (if fusion, it sets it for the first volume in the fusion)
*
* @param VolumeViewportProperties - The properties to set
* @param [VolumeViewportProperties.voiRange] - Sets the lower and upper voi
* @param [VolumeViewportProperties.VOILUTFunction] - Sets the voi mode (LINEAR, or SAMPLED_SIGMOID)
* @param [VolumeViewportProperties.invert] - Inverts the color transfer function
* @param [VolumeViewportProperties.colormap] - Sets the colormap
* @param [VolumeViewportProperties.preset] - Sets the colormap preset
* @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,
VOILUTFunction,
invert,
colormap,
preset,
interpolationType,
slabThickness,
rotation,
}: VolumeViewportProperties = {},
volumeId?: string,
suppressEvents = false
): void {
//If the viewport hasn't been initialized, we need to set the default properties
if (this.globalDefaultProperties == null) {
this.setDefaultProperties({
voiRange,
VOILUTFunction,
invert,
colormap,
preset,
slabThickness,
rotation,
});
}
// Note: colormap should always be done first, since we can then
// modify the voiRange
if (colormap?.name) {
this.setColormap(colormap, volumeId, suppressEvents);
}
Iif (colormap?.opacity != null) {
this.setOpacity(colormap, volumeId);
}
Eif (voiRange !== undefined) {
this.setVOI(voiRange, volumeId, suppressEvents);
}
Iif (typeof interpolationType !== 'undefined') {
this.setInterpolationType(interpolationType);
}
Iif (VOILUTFunction !== undefined) {
this.setVOILUTFunction(VOILUTFunction, volumeId, suppressEvents);
}
if (invert !== undefined && this.viewportProperties.invert !== invert) {
this.setInvert(invert, volumeId, suppressEvents);
}
Iif (preset !== undefined) {
this.setPreset(preset, volumeId, suppressEvents);
}
Iif (slabThickness !== undefined) {
this.setSlabThickness(slabThickness);
//We need to set the current slab thickness here since setSlabThickness is define in VolumeViewport
this.viewportProperties.slabThickness = slabThickness;
}
Iif (rotation !== undefined) {
this.setRotation(rotation);
}
}
/**
* Reset the viewport properties to the default values
*/
public resetToDefaultProperties(volumeId: string): void {
const properties = this.globalDefaultProperties;
if (properties.colormap?.name) {
this.setColormap(properties.colormap, volumeId);
}
if (properties.colormap?.opacity != null) {
this.setOpacity(properties.colormap, volumeId);
}
if (properties.voiRange !== undefined) {
this.setVOI(properties.voiRange, volumeId);
}
if (properties.VOILUTFunction !== undefined) {
this.setVOILUTFunction(properties.VOILUTFunction, volumeId);
}
if (properties.invert !== undefined) {
this.setInvert(properties.invert, volumeId);
}
if (properties.slabThickness !== undefined) {
this.setSlabThickness(properties.slabThickness);
//We need to set the current slabThickness here since setSlabThickness is define in VolumeViewport
this.viewportProperties.slabThickness = properties.slabThickness;
}
if (properties.rotation !== undefined) {
this.setRotation(properties.rotation);
}
this.render();
}
/**
* Sets the specified preset for the volume with the given ID
*
* @param presetName - The name of the preset to apply (e.g., "CT-Bone").
* @param volumeId - The ID of the volume to set the preset for.
* @param suppressEvents - If `true`, events will not be emitted during the preset application.
*
* @returns void
*/
private setPreset(presetNameOrObj, volumeId, suppressEvents) {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
if (!applicableVolumeActorInfo) {
return;
}
const { volumeActor } = applicableVolumeActorInfo;
let preset = presetNameOrObj;
if (typeof preset === 'string') {
preset = VIEWPORT_PRESETS.find((preset) => {
return preset.name === presetNameOrObj;
});
}
if (!preset) {
return;
}
applyPreset(volumeActor, preset);
this.viewportProperties.preset = preset;
this.render();
if (!suppressEvents) {
triggerEvent(this.element, Events.PRESET_MODIFIED, {
viewportId: this.id,
volumeId: applicableVolumeActorInfo.volumeId,
actor: volumeActor,
presetName: preset.name,
});
}
}
/**
* Retrieve the viewport default properties
* @param volumeId If given, we retrieve the default properties of a volumeId if it exists
* If not given,we return the global properties of the viewport
* @returns default viewport properties including voi, invert, interpolation type, colormap
*/
public getDefaultProperties = (
volumeId?: string
): VolumeViewportProperties => {
let volumeProperties;
if (volumeId !== undefined) {
volumeProperties = this.perVolumeIdDefaultProperties.get(volumeId);
}
if (volumeProperties !== undefined) {
return volumeProperties;
}
return {
...this.globalDefaultProperties,
};
};
/**
* Retrieve the viewport properties
* @param volumeId - The volume id to get the properties for (if undefined, the first volume)
* @returns viewport properties including voi, interpolation type: TODO: slabThickness, invert, rotation, flip
*/
public getProperties = (volumeId?: string): VolumeViewportProperties => {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
Iif (!applicableVolumeActorInfo) {
return;
}
const {
colormap: latestColormap,
VOILUTFunction,
interpolationType,
invert,
slabThickness,
rotation,
preset,
} = this.viewportProperties;
const voiRanges = this.getActors()
.map((actorEntry) => {
const volumeActor = actorEntry.actor as vtkVolume;
const volumeId = actorEntry.uid;
const volume = cache.getVolume(volumeId);
if (!volume) {
return null;
}
const cfun = volumeActor.getProperty().getRGBTransferFunction(0);
const [lower, upper] =
this.viewportProperties?.VOILUTFunction === 'SIGMOID'
? getVoiFromSigmoidRGBTransferFunction(cfun)
: cfun.getRange();
return { volumeId, voiRange: { lower, upper } };
})
.filter(Boolean);
const voiRange = volumeId
? voiRanges.find((range) => range.volumeId === volumeId)?.voiRange
: voiRanges[0]?.voiRange;
const volumeColormap = this.getColormap(volumeId);
const colormap =
volumeId && volumeColormap ? volumeColormap : latestColormap;
return {
colormap: colormap,
voiRange: voiRange,
VOILUTFunction: VOILUTFunction,
interpolationType: interpolationType,
invert: invert,
slabThickness: slabThickness,
rotation: rotation,
preset,
};
};
/**
* This function extracts the nodes from the RGB Transfer Function, transforming each node's x, r, g, b properties
* into a unified array "RGB Points." Then, it compares these RGB Points—specifically the r, g, b values—with
* those in the predefined vtk colormap presets. Upon finding a matching set of r, g, b values, the function identifies and selects the
* corresponding colormap.
*
* Next, the function extracts an array of opacity points, formatted as a sequence of [x,y] pairs, where 'x' represents a value and
* 'y' represents its opacity. It iterates through this array to construct an opacity object that maps each value to its opacity.
*
* The function returns an object that includes the name of the identified colormap and the constructed opacity object.
* @param applicableVolumeActorInfo - The volume actor information for the volume
* @returns colormap information for the volume if identified
*/
private getColormap = (volumeId) => {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
Iif (!applicableVolumeActorInfo) {
return;
}
const { volumeActor } = applicableVolumeActorInfo;
const cfun = volumeActor.getProperty().getRGBTransferFunction(0);
const { nodes } = cfun.getState();
const RGBPoints = nodes.reduce((acc, node) => {
acc.push(node.x, node.r, node.g, node.b);
return acc;
}, []);
const matchedColormap = findMatchingColormap(RGBPoints, volumeActor);
return matchedColormap;
};
/**
* 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);
Iif (!firstImageVolume) {
throw new Error(
`imageVolume with id: ${firstImageVolume.volumeId} does not exist`
);
}
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,
this.useNativeDataType
);
// 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,
referenceId: volumeId,
});
}
this._setVolumeActors(volumeActors);
this.viewportStatus = ViewportStatus.PRE_RENDER;
this.initializeColorTransferFunction(volumeInputArray);
triggerEvent(this.element, Events.VOLUME_VIEWPORT_NEW_VOLUME, {
viewportId: this.id,
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);
Iif (!firstImageVolume) {
throw new Error(
`imageVolume with id: ${firstImageVolume.volumeId} does not exist`
);
}
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,
this.useNativeDataType
);
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,
// although the actor UID is defined, we need to use the volumeId for the
// referenceId, since the actor UID is used to reference the actor in the
// viewport, however, the actor is created from its volumeId
// and if later we need to grab the referenced volume from cache,
// we can use the referenceId to get the volume from the cache
referenceId: volumeId,
});
}
this.addActors(volumeActors);
this.initializeColorTransferFunction(volumeInputArray);
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 {
console.warn('Method "setOrientation" needs implementation');
}
/**
* Initializes the color transfer function nodes for a given volume.
*
* @param volumeInputArray - Array of volume inputs.
* @param getTransferFunctionNodes - Function to get the transfer function nodes.
* @returns void
*/
private initializeColorTransferFunction(volumeInputArray) {
const selectedVolumeId = volumeInputArray[0].volumeId;
const colorTransferFunction =
this._getOrCreateColorTransferFunction(selectedVolumeId);
if (!this.initialTransferFunctionNodes) {
this.initialTransferFunctionNodes = getTransferFunctionNodes(
colorTransferFunction
);
}
}
private _getApplicableVolumeActor(volumeId?: string) {
if (volumeId !== undefined && !this.getActor(volumeId)) {
return;
}
const actorEntries = this.getActors();
if (!actorEntries.length) {
return;
}
let volumeActor;
if (volumeId) {
volumeActor = this.getActor(volumeId)?.actor as vtkVolume;
}
// // set it for the first volume (if there are more than one - fusion)
if (!volumeActor) {
volumeActor = actorEntries[0].actor as vtkVolume;
volumeId = actorEntries[0].uid;
}
return { volumeActor, volumeId };
}
private 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;
}
/**
* Gets the rotation resulting from the value set in setRotation AND taking into
* account any flips that occurred subsequently from the camera provided or the viewport.
*
* @returns the rotation resulting from the value set in setRotation AND taking into
* account any flips that occurred subsequently.
*/
public getRotation = (): number => {
const {
viewUp: currentViewUp,
viewPlaneNormal,
flipVertical,
} = this.getCamera();
// The initial view up vector without any rotation, but incorporating vertical flip.
const initialViewUp = flipVertical
? vec3.negate([0, 0, 0], this.initialViewUp)
: this.initialViewUp;
Iif (!initialViewUp) {
return 0;
}
// The angle between the initial and current view up vectors.
// TODO: check with VTK about rounding errors here.
const initialToCurrentViewUpAngle =
(vec3.angle(initialViewUp, currentViewUp) * 180) / Math.PI;
// Now determine if initialToCurrentViewUpAngle is positive or negative by comparing
// the direction of the initial/current view up cross product with the current
// viewPlaneNormal.
const initialToCurrentViewUpCross = vec3.cross(
[0, 0, 0],
initialViewUp,
currentViewUp
);
// The sign of the dot product of the start/end view up cross product and
// the viewPlaneNormal indicates a positive or negative rotation respectively.
const normalDot = vec3.dot(initialToCurrentViewUpCross, viewPlaneNormal);
const value =
normalDot >= 0
? initialToCurrentViewUpAngle
: (360 - initialToCurrentViewUpAngle) % 360;
return value;
};
/**
* 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);
}
public getFrameOfReferenceUID = (): string => {
return this._FrameOfReferenceUID;
};
/**
* 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 actorEntry = this.getActor(volumeId);
if (!actorIsA(actorEntry, 'vtkVolume')) {
return;
}
const actor = actorEntry.actor;
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().isDeleted()
? null
: vtkImageData.getPointData().getScalars().getData(),
imageData: actor.getMapper().getInputData(),
metadata: {
Modality: volume?.metadata?.Modality,
},
scaling: volume?.scaling,
hasPixelSpacing: true,
};
}
/**
* Attaches the volume actors to the viewport.
*
* @param volumeActorEntries - The volume actors to add the viewport.
*
*/
private _setVolumeActors(volumeActorEntries: Array<ActorEntry>): void {
// New volume actors implies resetting the inverted flag (i.e. like starting from scratch).
for (let i = 0; i < volumeActorEntries.length; i++) {
this.viewportProperties.invert = false;
}
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 transformation
* 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];
const worldCoord = openGLRenderWindow.displayToWorld(
displayCoord[0],
displayCoord[1],
0,
renderer
);
vtkCamera.setIsPerformingCoordinateTransformation?.(false);
return [worldCoord[0], worldCoord[1], worldCoord[2]];
};
/**
* 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(
...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;
};
/*
* 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 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((actorEntry) =>
actorIsA(actorEntry, '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);
});
};
protected _getOrientationVectors(
orientation: OrientationAxis | OrientationVectors
): OrientationVectors {
if (typeof orientation === 'object') {
if (orientation.viewPlaneNormal && orientation.viewUp) {
return orientation;
} else E{
throw new Error(
'Invalid orientation object. It must contain viewPlaneNormal and viewUp'
);
}
} else if (
typeof orientation === 'string' &&
MPR_CAMERA_VALUES[orientation]
) {
this.viewportProperties.orientation = orientation;
return MPR_CAMERA_VALUES[orientation];
} else E{
throw new Error(
`Invalid orientation: ${orientation}. Valid orientations are: ${Object.keys(
MPR_CAMERA_VALUES
).join(', ')}`
);
}
}
/**
* 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;
}
/**
* 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.getScalarData()[voxelIndex];
}
/**
* Returns the list of image Ids for the current viewport
*
* @param volumeId - volumeId
* @returns list of strings for image Ids
*/
public getImageIds = (volumeId?: string): Array<string> => {
const applicableVolumeActorInfo = this._getApplicableVolumeActor(volumeId);
if (!applicableVolumeActorInfo) {
throw new Error(`No actor found for the given volumeId: ${volumeId}`);
}
const volumeIdToUse = applicableVolumeActorInfo.volumeId;
const imageVolume = cache.getVolume(volumeIdToUse);
if (!imageVolume) {
throw new Error(
`imageVolume with id: ${volumeIdToUse} does not exist in cache`
);
}
return imageVolume.imageIds;
};
abstract getCurrentImageId(): string;
/** Gets the volumeId to use for references */
protected getVolumeId(specifier: ViewReferenceSpecifier) {
Eif (!specifier?.volumeId) {
const actorEntries = this.getActors();
Iif (!actorEntries) {
return;
}
// find the first image actor of instance type vtkVolume
return actorEntries.find(
(actorEntry) => actorEntry.actor.getClassName() === 'vtkVolume'
)?.uid;
}
return specifier.volumeId;
}
public getReferenceId(specifier: ViewReferenceSpecifier = {}): string {
let { volumeId, sliceIndex: sliceIndex } = specifier;
Eif (!volumeId) {
const actorEntries = this.getActors();
Iif (!actorEntries) {
return;
}
// find the first image actor of instance type vtkVolume
volumeId = actorEntries.find(
(actorEntry) => actorEntry.actor.getClassName() === 'vtkVolume'
)?.uid;
}
sliceIndex ??= this.getCurrentImageIdIndex();
const { viewPlaneNormal, focalPoint } = this.getCamera();
const querySeparator = volumeId.indexOf('?') > -1 ? '&' : '?';
return `volumeId:${volumeId}${querySeparator}sliceIndex=${sliceIndex}&viewPlaneNormal=${viewPlaneNormal.join(
','
)}&focalPoint=${focalPoint.join(',')}`;
}
abstract setBlendMode(
blendMode: BlendModes,
filterActorUIDs?: Array<string>,
immediate?: boolean
): void;
abstract setSlabThickness(
slabThickness: number,
filterActorUIDs?: Array<string>
): void;
abstract resetProperties(volumeId?: string): void;
}
export default BaseVolumeViewport;
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