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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 77 78 79 80 81 82 83 84 85 86 | 1x 1x 15x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x | import { vec3 } from 'gl-matrix';
import { CONSTANTS } from '@cornerstonejs/core';
import type { Types } from '@cornerstonejs/core';
import { 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 default function filterAnnotationsWithinSlice(
annotations: Annotations,
camera: Types.ICamera,
spacingInNormalDirection: number
): 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) => {
const annotationViewPlaneNormal = td.metadata.viewPlaneNormal;
const isParallel =
Math.abs(vec3.dot(viewPlaneNormal, annotationViewPlaneNormal)) >
PARALLEL_THRESHOLD;
return annotationViewPlaneNormal && isParallel;
}
);
// No in plane annotations.
Iif (!annotationsWithParallelNormals.length) {
return [];
}
// Annotation should be within the slice, which means that it should be between
// camera's focalPoint +/- spacingInNormalDirection.
const halfSpacingInNormalDirection = spacingInNormalDirection / 2;
const { focalPoint } = camera;
const annotationsWithinSlice = [];
for (const annotation of annotationsWithParallelNormals) {
const data = annotation.data;
const point = data.handles.points[0];
Iif (!annotation.isVisible) {
continue;
}
// A = point
// B = focal point
// P = normal
// B-A dot P => Distance in the view direction.
// this should be less than half the slice distance.
const dir = vec3.create();
vec3.sub(dir, focalPoint, point);
const dot = vec3.dot(dir, viewPlaneNormal);
Eif (Math.abs(dot) < halfSpacingInNormalDirection) {
annotationsWithinSlice.push(annotation);
}
}
return annotationsWithinSlice;
}
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