react-native-zoom-toolkit/src/utils/fitContainer.ts

Most complete set of pinch to zoom utilites for React Native

import type { SizeVector } from '../commons/types';

export const fitContainer = (
  aspectRatio: number,
  container: SizeVector<number>
): SizeVector<number> => {
  'worklet';

  let width = container.width;
  let height = container.width / aspectRatio;

  if (height > container.height) {
    width = container.height * aspectRatio;
    height = container.height;
  }

  return { width, height };
};