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import { EPSILON } from '../constants';
import type { ICamera, IImageVolume, IVolumeViewport, Point3 } from '../types';
import getSpacingInNormalDirection from './getSpacingInNormalDirection';
import { getVolumeLoaderSchemes } from '../loaders/volumeLoader';
import { getVolumeId } from './getVolumeId';
// One EPSILON part larger multiplier
const EPSILON_PART = 1 + EPSILON;
const startsWith = (str, starts) =>
starts === str.substring(0, Math.min(str.length, starts.length));
// Check if this is a primary volume
// For now, that means it came from some sort of image loader, but
// should be specifically designated.
const isPrimaryVolume = (volume): boolean =>
!!getVolumeLoaderSchemes().find((scheme) =>
startsWith(volume.volumeId, scheme)
);
/**
* Given a volume viewport and camera, find the target volume.
* The imageVolume is retrieved from cache for the specified targetId or
* in case it is not provided, it chooses the volumeId on the viewport (there
* might be more than one in case of fusion) that has the finest resolution in the
* direction of view (normal).
*
* @param viewport - volume viewport
* @param camera - current camera
* @param targetId - If a targetId is forced to be used.
* @param useSlabThickness - If true, the number of steps will be calculated
* based on the slab thickness instead of the spacing in the normal direction
* @returns An object containing the imageVolume and spacingInNormalDirection.
*
*/
export default function getTargetVolumeAndSpacingInNormalDir(
viewport: IVolumeViewport,
camera: ICamera,
targetId?: string,
useSlabThickness = false
): {
imageVolume: IImageVolume;
spacingInNormalDirection: number;
actorUID: string;
} {
const { viewPlaneNormal } = camera;
const volumeActors = viewport.getActors();
Iif (!volumeActors.length) {
return {
spacingInNormalDirection: null,
imageVolume: null,
actorUID: null,
};
}
const imageVolumes = volumeActors
.map((va) => {
// prefer the referenceUID if it is set, since it can be a derived actor
// and the uid does not necessarily match the volumeId
const actorUID = va.referencedId ?? va.uid;
return cache.getVolume(actorUID);
})
.filter((iv) => !!iv);
// If a volumeId is defined, set that volume as the target
if (targetId) {
const targetVolumeId = getVolumeId(targetId);
const imageVolumeIndex = imageVolumes.findIndex((iv) =>
targetVolumeId.includes(iv.volumeId)
);
const imageVolume = imageVolumes[imageVolumeIndex];
const { uid: actorUID } = volumeActors[imageVolumeIndex];
const spacingInNormalDirection = getSpacingInNormal(
imageVolume,
viewPlaneNormal,
viewport,
useSlabThickness
);
return { imageVolume, spacingInNormalDirection, actorUID };
}
Iif (!imageVolumes.length) {
return {
spacingInNormalDirection: null,
imageVolume: null,
actorUID: null,
};
}
// Fetch volume actor with finest resolution in direction of projection.
const smallest = {
spacingInNormalDirection: Infinity,
imageVolume: null,
actorUID: null,
};
const hasPrimaryVolume = imageVolumes.find(isPrimaryVolume);
for (let i = 0; i < imageVolumes.length; i++) {
const imageVolume = imageVolumes[i];
if (hasPrimaryVolume && !isPrimaryVolume(imageVolume)) {
// Secondary volumes like segmentation don't count towards spacing
continue;
}
const spacingInNormalDirection = getSpacingInNormal(
imageVolume,
viewPlaneNormal,
viewport
);
// Allow for EPSILON part larger requirement to prefer earlier volumes
// when the spacing is within a factor of EPSILON. Use a factor because
// that deals with very small or very large volumes effectively.
Eif (
spacingInNormalDirection * EPSILON_PART <
smallest.spacingInNormalDirection
) {
smallest.spacingInNormalDirection = spacingInNormalDirection;
smallest.imageVolume = imageVolume;
smallest.actorUID = volumeActors[i].uid;
}
}
return smallest;
}
function getSpacingInNormal(
imageVolume: IImageVolume,
viewPlaneNormal: Point3,
viewport: IVolumeViewport,
useSlabThickness = false
): number {
const { slabThickness } = viewport.getProperties();
let spacingInNormalDirection = slabThickness;
Eif (!slabThickness || !useSlabThickness) {
spacingInNormalDirection = getSpacingInNormalDirection(
imageVolume,
viewPlaneNormal
);
}
return spacingInNormalDirection;
}
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