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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 | 1x 1x 1x 1x 1x 1x 1x 1x | import { IVolumeViewport } from '../types';
import getVolumeSliceRangeInfo from './getVolumeSliceRangeInfo';
/**
* Calculates the number os steps the volume can scroll based on its orientation
* @param viewport - Volume viewport
* @param volumeId - Id of one of the volumes loaded on the given viewport
* @returns number of steps the volume can scroll and its current position
*/
function getVolumeViewportScrollInfo(
viewport: IVolumeViewport,
volumeId: string
) {
const { sliceRange, spacingInNormalDirection, camera } =
getVolumeSliceRangeInfo(viewport, volumeId);
const { min, max, current } = sliceRange;
// Now we can see how many steps there are in this direction
const numScrollSteps = Math.round((max - min) / spacingInNormalDirection);
// Find out current frameIndex
const fraction = (current - min) / (max - min);
const floatingStepNumber = fraction * numScrollSteps;
const currentStepIndex = Math.round(floatingStepNumber);
return {
numScrollSteps,
currentStepIndex,
sliceRangeInfo: {
sliceRange,
spacingInNormalDirection,
camera,
},
};
}
export default getVolumeViewportScrollInfo;
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