react-native-zoom-toolkit/lib/module/utils/getAspectRatioSize.js

Smoothly zoom any image, video or component you want!

/**
 * @description Gets width and height based on the aspect ratio.
 * @param options An object describing the aspect ratio of an image/video, and optional width and height
 * parameters, calculates height if this is undefined based on width and vice versa.
 * @returns An object containing the computed width and height by the aspect ratio.
 */
export const getAspectRatioSize = options => {
  'worklet';

  const {
    aspectRatio,
    width,
    height
  } = options;
  if (width === undefined && height === undefined) {
    throw Error('maxWidth and maxHeight parameters are undefined, provide at least one of them');
  }
  if (width !== undefined) {
    return {
      width: Math.floor(width),
      height: Math.floor(width / aspectRatio)
    };
  }
  return {
    width: Math.floor(height * aspectRatio),
    height: Math.floor(height)
  };
};
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