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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 | import { cache } from '@cornerstonejs/core';
import { getSegmentation } from '../getSegmentation';
import { triggerSegmentationDataModified } from '../triggerSegmentationEvents';
/**
* Clears the specified segment value from a segmentation.
*
* @param segmentationId - The unique identifier of the segmentation.
* @param segmentIndex - The index of the segment to be cleared.
*
* @throws {Error} If the segmentation type is not supported (currently only labelmap is supported).
*
* @remarks
* This function iterates through all voxels in the segmentation and sets the value to 0
* for any voxel that matches the specified segment index. It supports both stack and volume
* segmentations.
*/
export function clearSegmentValue(
segmentationId: string,
segmentIndex: number
) {
const segmentation = getSegmentation(segmentationId);
if (segmentation.representationData.Labelmap) {
const { representationData } = segmentation;
const labelmapData = representationData.Labelmap;
if ('imageIds' in labelmapData || 'volumeId' in labelmapData) {
const items =
'imageIds' in labelmapData
? labelmapData.imageIds.map((imageId) => cache.getImage(imageId))
: [cache.getVolume(labelmapData.volumeId)];
items.forEach((item) => {
if (!item) {
return;
}
const { voxelManager } = item;
voxelManager.forEach(({ value, index }) => {
if (value === segmentIndex) {
voxelManager.setAtIndex(index, 0);
}
});
});
}
triggerSegmentationDataModified(segmentationId);
} else {
throw new Error(
'Invalid segmentation type, only labelmap is supported right now'
);
}
}
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