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import { CONSTANTS, metaData } from '@cornerstonejs/core';
import type { Types } from '@cornerstonejs/core';
import type { Annotations, Annotation } from '../../types';
const { EPSILON } = CONSTANTS;
const PARALLEL_THRESHOLD = 1 - EPSILON;
/**
* given some `Annotations`, and the slice defined by the camera's normal
* direction and the spacing in the normal, filter the `Annotations` which
* is within the slice.
*
* @param annotations - Annotations
* @param camera - The camera
* @param spacingInNormalDirection - The spacing in the normal direction
* @returns The filtered `Annotations`.
*/
export function filterAnnotationsWithinSamePlane(
annotations: Annotations,
camera: Types.ICamera
): Annotations {
const { viewPlaneNormal } = camera;
// The reason we use parallel normals instead of actual orientation is that
// flipped action is done through camera API, so we can't rely on the
// orientation (viewplaneNormal and viewUp) since even the same image and
// same slice if flipped will have different orientation, but still rendering
// the same slice. Instead, we choose to use the parallel normals to filter
// the annotations and later we fine tune it with the annotation within slice
// logic down below.
const annotationsWithParallelNormals = annotations.filter(
(td: Annotation) => {
let annotationViewPlaneNormal = td.metadata.viewPlaneNormal;
Iif (!annotationViewPlaneNormal) {
// This code is run to set the annotation view plane normal
// for historical data which was saved without the normal.
const { referencedImageId } = td.metadata;
const { imageOrientationPatient } = metaData.get(
'imagePlaneModule',
referencedImageId
);
const rowCosineVec = vec3.fromValues(
imageOrientationPatient[0],
imageOrientationPatient[1],
imageOrientationPatient[2]
);
const colCosineVec = vec3.fromValues(
imageOrientationPatient[3],
imageOrientationPatient[4],
imageOrientationPatient[5]
);
annotationViewPlaneNormal = vec3.create() as Types.Point3;
vec3.cross(annotationViewPlaneNormal, rowCosineVec, colCosineVec);
td.metadata.viewPlaneNormal = annotationViewPlaneNormal;
}
const isParallel =
Math.abs(vec3.dot(viewPlaneNormal, annotationViewPlaneNormal)) >
PARALLEL_THRESHOLD;
return annotationViewPlaneNormal && isParallel;
}
);
// No in plane annotations.
Iif (!annotationsWithParallelNormals.length) {
return [];
}
return annotationsWithParallelNormals;
}
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