boundingBox snapIndexBounds.ts

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  import type { Types } from '@cornerstonejs/core';
 
/**
 * Converts floating-point min/max index bounds to integer voxel indices.
 *
 * For planar annotations (delta ≤ 1), floating-point drift from world-to-index
 * conversion can map to adjacent slices. Collapsing to a single rounded index
 * keeps planar ROIs on the intended slice across viewport types.
 *
 * For bounds spanning multiple voxels (delta > 1), floor/ceil preserves coverage.
 */
function snapIndexBounds(min: number, max: number): Types.Point2 {
  const delta = max - min;
 
  if (delta <= 1) {
    const index = Math.round((min + max) / 2);
 
    return [index, index];
  }
 
  return [Math.floor(min), Math.ceil(max)];
}
 
export default snapIndexBounds;