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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 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import {
StackViewport,
Types,
VolumeViewport,
utilities as csUtils,
} from '@cornerstonejs/core';
import { ScrollOptions } from '../types';
/**
* It scrolls one slice in the Stack or Volume Viewport, it uses the options provided
* to determine the slice to scroll to. For Stack Viewport, it scrolls in the 1 or -1
* direction, for Volume Viewport, it uses the camera and focal point to determine the
* slice to scroll to based on the spacings.
* @param viewport - The viewport in which to scroll
* @param options - Options to use for scrolling, including direction, invert, and volumeId
* @returns
*/
export default function scroll(
viewport: Types.IStackViewport | Types.IVolumeViewport,
options: ScrollOptions
): void {
const { type: viewportType } = viewport;
const { volumeId, delta } = options;
if (viewport instanceof StackViewport) {
viewport.scroll(delta, options.debounceLoading);
} else if (viewport instanceof VolumeViewport) {
scrollVolume(viewport, volumeId, delta);
} else {
throw new Error(`Not implemented for Viewport Type: ${viewportType}`);
}
}
export function scrollVolume(
viewport: VolumeViewport,
volumeId: string,
delta: number
) {
const camera = viewport.getCamera();
const { focalPoint, viewPlaneNormal, position } = camera;
const { spacingInNormalDirection, imageVolume } =
csUtils.getTargetVolumeAndSpacingInNormalDir(viewport, camera, volumeId);
Iif (!imageVolume) {
throw new Error(
`Could not find image volume with id ${volumeId} in the viewport`
);
}
const actorEntry = viewport.getActor(imageVolume.volumeId);
Iif (!actorEntry) {
console.warn('No actor found for with actorUID of', imageVolume.volumeId);
}
const volumeActor = actorEntry.actor as Types.VolumeActor;
const sliceRange = csUtils.getSliceRange(
volumeActor,
viewPlaneNormal,
focalPoint
);
const { newFocalPoint, newPosition } = csUtils.snapFocalPointToSlice(
focalPoint,
position,
sliceRange,
viewPlaneNormal,
spacingInNormalDirection,
delta
);
viewport.setCamera({
focalPoint: newFocalPoint,
position: newPosition,
});
viewport.render();
}
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