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import type { LoadedData } from '../ViewportArchitectureTypes';
import GenericViewport from '../GenericViewport';
import { ViewportType } from '../../../enums';
import { getDefaultECGValueRange } from '../../../utilities/ECGUtilities';
import type {
CPUIImageData,
Mat3,
Point2,
Point3,
ViewReference,
ViewReferenceSpecifier,
} from '../../../types';
import { DefaultECGDataProvider } from './DefaultECGDataProvider';
import { createECGRenderPathResolver } from './ECGRenderPathResolver';
import type { GenericViewportReferenceContext } from '../genericViewportReferenceCompatibility';
import type {
ECGViewState,
ECGCanvasRenderContext,
ECGCanvasRendering,
ECGDataPresentation,
ECGViewportInput,
ECGWaveformPayload,
} from './ECGViewportTypes';
import {
createDefaultECGViewState,
normalizeECGViewState,
} from './ecgViewportCamera';
import ECGResolvedView from './ECGResolvedView';
const ECG_AMPLITUDE_INDEX_SIZE = 65536;
class ECGViewport extends GenericViewport<
ECGViewState,
ECGDataPresentation,
ECGCanvasRenderContext
> {
readonly type = ViewportType.ECG_NEXT;
readonly renderingEngineId: string;
readonly canvas: HTMLCanvasElement;
readonly canvasContext: CanvasRenderingContext2D;
protected renderContext: ECGCanvasRenderContext;
static get useCustomRenderingPipeline(): boolean {
return true;
}
getUseCustomRenderingPipeline(): boolean {
return true;
}
constructor(args: ECGViewportInput) {
super(args);
this.renderingEngineId = args.renderingEngineId;
this.canvas = getOrCreateCanvas(this.element);
this.canvasContext = this.canvas.getContext('2d');
this.dataProvider = args.dataProvider || new DefaultECGDataProvider();
this.renderPathResolver =
args.renderPathResolver || createECGRenderPathResolver();
this.renderContext = {
viewportId: this.id,
type: 'ecg',
renderingEngineId: this.renderingEngineId,
element: this.element,
canvas: this.canvas,
canvasContext: this.canvasContext,
};
this.viewState = createDefaultECGViewState({
timeRange: [0, 1],
valueRange: [-1, 1],
});
this.element.setAttribute('data-viewport-uid', this.id);
this.element.setAttribute(
'data-rendering-engine-uid',
this.renderingEngineId
);
this.resize();
}
/**
* Replaces all mounted waveform display sets with the provided ones using
* the canvas ECG render path.
*
* @param entries - Waveform display sets to mount.
*/
async setDisplaySets(
...entries: Array<{ displaySetId: string }>
): Promise<void> {
this.removeAllData();
for (const { displaySetId } of entries) {
const waveform = await this.loadWaveformData(displaySetId);
const durationMs =
(waveform.numberOfSamples / waveform.samplingFrequency) * 1000;
this.setDefaultDataPresentation(displaySetId, {
visible: true,
opacity: 1,
visibleChannels: waveform.channels.map((_channel, index) => index),
lineWidth: 1,
amplitudeScale: 1,
showGrid: true,
});
this.viewState = createDefaultECGViewState({
timeRange: [0, durationMs],
valueRange: getDefaultECGValueRange(waveform),
});
await this.addLoadedData(displaySetId, waveform, {
renderMode: 'signal2d',
});
}
}
getWaveformData(): ECGWaveformPayload | null {
return this.getWaveformBindingData() ?? null;
}
getViewReference(_specifier: ViewReferenceSpecifier = {}): ViewReference {
const dataId = this.getFirstBinding()?.data.id;
return {
FrameOfReferenceUID: this.getFrameOfReferenceUID(),
dataId,
referencedImageId: this.getCurrentImageId(),
sliceIndex: 0,
};
}
getViewReferenceId(_specifier: ViewReferenceSpecifier = {}): string {
return `imageId:${this.getCurrentImageId()}`;
}
setViewReference(_viewRef: ViewReference): void {
// ECG viewports always show the single active waveform.
}
getSliceIndex(): number {
return 0;
}
getZoom(): number {
return (
this.getResolvedView()?.zoom ?? Math.max(this.viewState.scale ?? 1, 0.001)
);
}
protected override normalizeViewState(viewState: ECGViewState): ECGViewState {
return normalizeECGViewState(viewState);
}
protected getReferenceViewContexts(): GenericViewportReferenceContext[] {
const binding = this.getFirstBinding();
if (!binding) {
return super.getReferenceViewContexts();
}
return [
{
dataId: binding.data.id,
dataIds: [binding.data.id],
frameOfReferenceUID: this.getFrameOfReferenceUID(),
imageIds: [binding.data.id],
currentImageIdIndex: 0,
},
];
}
setZoom(zoom: number, canvasPoint?: Point2): void {
const resolvedView = this.getResolvedView();
if (resolvedView) {
this.applyResolvedViewState(
resolvedView.withZoom(zoom, canvasPoint).state.viewState
);
return;
}
this.setViewState({
scale: Math.max(zoom, 0.001),
scaleMode: 'fit',
});
}
getPan(): Point2 {
return this.getResolvedView()?.pan ?? [0, 0];
}
setPan(pan: Point2): void {
const resolvedView = this.getResolvedView();
if (!resolvedView) {
return;
}
this.applyResolvedViewState(resolvedView.withPan(pan).state.viewState);
}
/**
* Returns channel visibility state for the active ECG dataset.
*
* @returns Channel names paired with their current visibility state.
*/
getVisibleChannels(): { name: string; visible: boolean }[] {
const waveform = this.getWaveformBindingData();
if (!waveform) {
return [];
}
const dataId = waveform.id;
const visibleChannels = new Set(
this.getDisplaySetPresentation(dataId)?.visibleChannels ||
waveform.channels.map((_channel, index) => index)
);
return waveform.channels.map((channel, index) => ({
name: channel.name,
visible: visibleChannels.has(index),
}));
}
/**
* Returns the rendered ECG content dimensions in device pixels.
*
* @returns The ECG content width and height in device pixels.
*/
getContentDimensions(): { width: number; height: number } {
const rendering = this.getCurrentRendering();
if (!rendering) {
return { width: 0, height: 0 };
}
return {
width: rendering.metrics.ecgWidth,
height: rendering.metrics.ecgHeight,
};
}
/**
* Resizes the backing canvas to match the displayed viewport size.
*/
resize(): void {
const { clientWidth, clientHeight } = this.canvas;
if (
this.canvas.width !== clientWidth ||
this.canvas.height !== clientHeight
) {
const dpr = window.devicePixelRatio || 1;
this.canvas.width = Math.floor(Math.max(1, clientWidth) * dpr);
this.canvas.height = Math.floor(Math.max(1, clientHeight) * dpr);
}
this.render();
}
/**
* Renders all active ECG bindings.
*/
render(): void {
this.renderBindings();
}
/**
* Called by the rendering engine render loop for custom pipeline viewports.
*/
customRenderViewportToCanvas(): void {
this.render();
}
/**
* Resets pan and zoom to defaults and re-renders.
*/
resetViewState(): boolean {
const previousCamera = this.getCameraForEvent();
this.viewState = createDefaultECGViewState({
timeRange: this.viewState.timeRange,
valueRange: this.viewState.valueRange,
});
this.modified(previousCamera);
this.triggerCameraResetEvent();
return true;
}
/**
* ECG viewports have no rotation.
*/
getRotation(): number {
return 0;
}
/**
* No-op: ECG viewports are not slice stacks.
*/
scroll(): void {
// no-op
}
/**
* Returns the current ECG image id, if one has been loaded.
*/
getCurrentImageId(): string | undefined {
const binding = this.getFirstBinding();
return binding?.data.id;
}
/**
* ECG viewports always display index 0.
*/
getCurrentImageIdIndex(): number {
return 0;
}
/**
* Returns the image ids for the active ECG dataset.
*/
getImageIds(): string[] {
const binding = this.getFirstBinding();
return binding ? [binding.data.id] : [];
}
/**
* Returns image data compatible with the Cornerstone tools annotation system.
* Amplitude is mapped to [0, ECG_AMPLITUDE_INDEX_SIZE) so annotation
* index bounds checks work correctly across channels.
*/
getImageData(): CPUIImageData | null {
const waveform = this.getWaveformBindingData();
if (!waveform) {
return null;
}
const nSamples = waveform.numberOfSamples;
const nChannels = waveform.channels.length;
const dimensions: Point3 = [nSamples, ECG_AMPLITUDE_INDEX_SIZE, nChannels];
const spacing: Point3 = [1, 1, 1];
const origin: Point3 = [0, 0, 0];
const direction: Mat3 = [1, 0, 0, 0, 1, 0, 0, 0, 1];
const amplitudeOffset = ECG_AMPLITUDE_INDEX_SIZE / 2;
const scalarData = new Int16Array(0);
const imageData: CPUIImageData['imageData'] = {
getDirection: () => direction,
getDimensions: () => dimensions,
getRange: () => [0, 1] as Point2,
getSpacing: () => spacing,
worldToIndex: (point: Point3) => {
return [point[0], point[1] + amplitudeOffset, point[2]] as Point3;
},
indexToWorld: (point: Point3) => {
return [point[0], point[1] - amplitudeOffset, point[2]] as Point3;
},
};
return {
dimensions,
spacing,
origin,
direction,
imageData,
scalarData,
hasPixelSpacing: false,
preScale: { scaled: false },
metadata: { Modality: 'ECG', FrameOfReferenceUID: '' },
};
}
private setScaleAtCanvasPoint(scale: number, canvasPoint: Point2): void {
const resolvedView = this.getResolvedView();
if (!resolvedView) {
this.setZoom(scale);
return;
}
this.applyResolvedViewState(
resolvedView.withZoom(scale, canvasPoint).state.viewState
);
}
private async loadWaveformData(
dataId: string
): Promise<LoadedData<ECGWaveformPayload>> {
const waveform = await this.dataProvider.load(dataId);
if (!isECGWaveformData(waveform)) {
throw new Error(
`[ECGViewport] Loaded data for ${dataId} is not a valid ECG waveform`
);
}
return waveform;
}
private getWaveformBindingData(): LoadedData<ECGWaveformPayload> | undefined {
const binding = this.getFirstBinding();
if (!binding || !isECGWaveformData(binding.data)) {
return;
}
return binding.data;
}
private getCurrentRendering(): ECGCanvasRendering | undefined {
const binding = this.getFirstBinding();
if (!binding || !isECGCanvasRendering(binding.rendering)) {
return;
}
return binding.rendering;
}
getResolvedView(): ECGResolvedView | undefined {
const waveform = this.getWaveformBindingData();
const rendering = this.getCurrentRendering();
if (!waveform || !rendering) {
return;
}
return new ECGResolvedView({
viewState: this.viewState,
canvas: this.canvas,
dataPresentation: this.getDisplaySetPresentation(waveform.id),
frameOfReferenceUID: `ecg-viewport-${this.id}`,
metrics: rendering.metrics,
waveform,
});
}
/**
* Applies a resolved ECG view state through the canonical mutation path.
*/
private applyResolvedViewState(nextViewState: ECGViewState): void {
this.setViewState(nextViewState);
}
}
export default ECGViewport;
function isECGWaveformData(
data: LoadedData
): data is LoadedData<ECGWaveformPayload> {
if (typeof data !== 'object' || data === null || data.type !== 'ecg') {
return false;
}
const waveform = data as Record<string, unknown>;
return (
Array.isArray(waveform.channels) &&
typeof waveform.numberOfSamples === 'number' &&
typeof waveform.samplingFrequency === 'number' &&
typeof waveform.numberOfChannels === 'number'
);
}
function isECGCanvasRendering(rendering: {
renderMode: string;
}): rendering is ECGCanvasRendering {
return rendering.renderMode === 'signal2d';
}
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