All files / packages/core/src/utilities calibratedPixelSpacingMetadataProvider.ts

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import imageIdToURI from './imageIdToURI';
 
const state = {}; // Calibrated pixel spacing per imageId
 
/**
 * Simple metadataProvider object to store metadata for calibrated spacings.
 * This can be added via cornerstone.metaData.addProvider(...) in order to store
 * and return calibrated pixel spacings when metaData type is "calibratedPixelSpacing".
 */
const metadataProvider = {
  /**
   * Adds metadata for an imageId.
   * @param imageId - the imageId for the metadata to store
   * @param payload - the payload composed of new calibrated pixel spacings
   */
  add: (imageId: string, payload: [number, number]): void => {
    const imageURI = imageIdToURI(imageId);
    Eif (!state[imageURI]) {
      state[imageURI] = {};
    }
    state[imageURI] = payload;
  },
 
  /**
   * Returns the metadata for an imageId if it exists.
   * @param type - the type of metadata to enquire about
   * @param imageId - the imageId to enquire about
   * @returns the calibrated pixel spacings for the imageId if it exists, otherwise undefined
   */
  get: (type: string, imageId: string): [number, number] => {
    if (type === 'calibratedPixelSpacing') {
      const imageURI = imageIdToURI(imageId);
      return state[imageURI];
    }
  },
};
 
export default metadataProvider;