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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | 1x 65x 44x 267x 267x 267x 267x 267x 47x 267x 267x 267x 267x 207x 60x 60x 60x | import {
getImageSliceDataForVolumeViewport,
triggerEvent,
} from '../../utilities';
import { EventTypes } from '../../types';
import { Events } from '../../enums';
import { getRenderingEngine } from '../getRenderingEngine';
import BaseVolumeViewport from '../BaseVolumeViewport';
// Keeping track of previous imageIndex for each viewportId
type VolumeImageState = Record<string, number>;
const state: VolumeImageState = {};
export function resetVolumeNewImageState(viewportId: string): void {
if (state[viewportId] !== undefined) {
delete state[viewportId];
}
}
/**
* It captures the camera modified event and with the camera focal point and viewPlaneNomad
* it calculates the image index in the view direction. Finally it triggers
* a VOLUME_NEW_IMAGE event with the image index.
*
* @internal
*
* @param cameraEvent - The camera modified event
* @param viewportImageData - The image data of the viewport
*/
function volumeNewImageEventDispatcher(
cameraEvent: EventTypes.CameraModifiedEvent
): void {
const { renderingEngineId, viewportId } = cameraEvent.detail;
const renderingEngine = getRenderingEngine(renderingEngineId);
const viewport = renderingEngine.getViewport(viewportId);
Iif (!(viewport instanceof BaseVolumeViewport)) {
throw new Error(
`volumeNewImageEventDispatcher: viewport is not a BaseVolumeViewport`
);
}
if (state[viewport.id] === undefined) {
state[viewport.id] = 0;
}
const sliceData = getImageSliceDataForVolumeViewport(viewport);
Iif (!sliceData) {
console.warn(
`volumeNewImageEventDispatcher: sliceData is undefined for viewport ${viewport.id}`
);
return;
}
const { numberOfSlices, imageIndex } = sliceData;
if (state[viewport.id] === imageIndex) {
return;
}
state[viewport.id] = imageIndex;
const eventDetail: EventTypes.VolumeNewImageEventDetail = {
imageIndex,
viewportId,
renderingEngineId,
numberOfSlices,
};
triggerEvent(viewport.element, Events.VOLUME_NEW_IMAGE, eventDetail);
}
export default volumeNewImageEventDispatcher;
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