Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | 4x 4x 4x 4x 4x 4x 3x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import {
StackViewport,
Types,
VolumeViewport,
eventTarget,
EVENTS,
utilities as csUtils,
getEnabledElement,
} from '@cornerstonejs/core';
import { ScrollOptions, EventTypes } 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 {
// check if viewport is disabled then throw error
const enabledElement = getEnabledElement(viewport.element);
Iif (!enabledElement) {
throw new Error('Scroll::Viewport is not enabled (it might be disabled)');
}
Iif (
viewport instanceof StackViewport &&
viewport.getImageIds().length === 0
) {
throw new Error('Scroll::Stack Viewport has no images');
}
const { type: viewportType } = viewport;
const { volumeId, delta } = options;
if (viewport instanceof StackViewport) {
viewport.scroll(delta, options.debounceLoading, options.loop);
} else Eif (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 { numScrollSteps, currentStepIndex, sliceRangeInfo } =
csUtils.getVolumeViewportScrollInfo(viewport, volumeId);
Iif (!sliceRangeInfo) {
return;
}
const { sliceRange, spacingInNormalDirection, camera } = sliceRangeInfo;
const { focalPoint, viewPlaneNormal, position } = camera;
const { newFocalPoint, newPosition } = csUtils.snapFocalPointToSlice(
focalPoint,
position,
sliceRange,
viewPlaneNormal,
spacingInNormalDirection,
delta
);
viewport.setCamera({
focalPoint: newFocalPoint,
position: newPosition,
});
viewport.render();
const desiredStepIndex = currentStepIndex + delta;
Iif (
(desiredStepIndex > numScrollSteps || desiredStepIndex < 0) &&
viewport.getCurrentImageId() // Check that we are in the plane of acquistion
) {
// One common use case of this trigger might be to load the next
// volume in a time series or the next segment of a partially loaded volume.
const VolumeScrollEventDetail = {
volumeId,
viewport,
delta,
desiredStepIndex,
currentStepIndex,
numScrollSteps,
currentImageId: viewport.getCurrentImageId(),
};
csUtils.triggerEvent(
eventTarget,
EVENTS.VOLUME_SCROLL_OUT_OF_BOUNDS,
VolumeScrollEventDetail as EventTypes.VolumeScrollOutOfBoundsEventDetail
);
}
}
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