utilities getVOIMultipliers.ts

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  import { Types, utilities as csUtils } from '@cornerstonejs/core';
import { isViewportPreScaled } from './viewport';
 
const DEFAULT_MULTIPLIER = 4;
 
function getVOIMultipliers(
  viewport: Types.IStackViewport | Types.IVolumeViewport,
  volumeId?: string,
  options?: {
    fixedPTWindowWidth?: boolean;
  }
): [number, number] {
  const modality = csUtils.getViewportModality(viewport, volumeId);
 
  if (modality === 'PT') {
    const { clientWidth, clientHeight } = viewport.element;
    const ptMultiplier = 5 / Math.max(clientWidth, clientHeight);
    const isPreScaled = isViewportPreScaled(viewport, volumeId);
    const { fixedPTWindowWidth = true } = options ?? {};
 
    // Set the "X" multiplier equal to zero in order to do not allow
    // any change to the window width (0 * cursorDeltaX = 0)
    const xMultiplier = fixedPTWindowWidth ? 0 : ptMultiplier;
 
    return isPreScaled
      ? [xMultiplier, ptMultiplier]
      : [xMultiplier, DEFAULT_MULTIPLIER];
  }
 
  return [DEFAULT_MULTIPLIER, DEFAULT_MULTIPLIER];
}
 
export { getVOIMultipliers as default, getVOIMultipliers };