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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 | 128x | import { vec3 } from 'gl-matrix';
import type { Types } from '@cornerstonejs/core';
import getViewportICamera from '../getViewportICamera';
import type { Plane } from './types';
const MIN_NORMAL_LENGTH = 1e-10;
function isFinitePoint3(point: Types.Point3 | undefined): boolean {
return (
Array.isArray(point) &&
point.length === 3 &&
point.every((v) => Number.isFinite(v))
);
}
/**
* Returns the slice plane currently displayed by a viewport, defined by the
* camera view-plane normal and focal point. The returned normal is normalized.
*
* Returns null when the viewport has no valid camera (e.g. non-image
* viewports, or viewports that have not been rendered yet).
*/
export default function getViewportPlane(
viewport: Types.IViewport
): Plane | null {
if (!viewport) {
return null;
}
let camera;
try {
camera = getViewportICamera(viewport);
} catch {
return null;
}
const viewPlaneNormal = camera?.viewPlaneNormal as Types.Point3 | undefined;
const focalPoint = camera?.focalPoint as Types.Point3 | undefined;
if (!isFinitePoint3(viewPlaneNormal) || !isFinitePoint3(focalPoint)) {
return null;
}
if (vec3.length(viewPlaneNormal) < MIN_NORMAL_LENGTH) {
return null;
}
const normal = vec3.normalize(vec3.create(), viewPlaneNormal);
return {
normal: [normal[0], normal[1], normal[2]],
point: [focalPoint[0], focalPoint[1], focalPoint[2]],
};
}
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