react-native-zoom-toolkit/lib/module/commons/utils/getCropRotatedSize.js

Most complete set of pinch to zoom utilites for React Native

export const getRatioSize = (aspectRatio, container) => {
  'worklet';

  if (container.width !== undefined) {
    return {
      width: container.width,
      height: container.width / aspectRatio
    };
  }
  return {
    width: container.height * aspectRatio,
    height: container.height
  };
};
export const getCropRotatedSize = options => {
  'worklet';

  const {
    crop,
    angle,
    resolution
  } = options;
  const cropAspectRatio = crop.width / crop.height;
  let base = crop;
  const flipped = angle % Math.PI === 0;
  const aspectRatio = resolution.width / resolution.height;
  const inverseAspectRatio = resolution.height / resolution.width;
  const currentAspectRatio = flipped ? aspectRatio : inverseAspectRatio;
  base = getRatioSize(currentAspectRatio, {
    width: cropAspectRatio >= 1 ? undefined : crop.width,
    height: cropAspectRatio >= 1 ? crop.height : undefined
  });
  let sizeModifier = 1;
  if (base.height < crop.height) sizeModifier = crop.height / base.height;
  if (base.width < crop.width) sizeModifier = crop.width / base.width;
  base.width = base.width * sizeModifier;
  base.height = base.height * sizeModifier;
  const maxWidth = Math.abs(base.height * Math.sin(angle)) + Math.abs(base.width * Math.cos(angle));
  const maxHeight = Math.abs(base.height * Math.cos(angle)) + Math.abs(base.width * Math.sin(angle));
  return getRatioSize(aspectRatio, {
    width: aspectRatio >= 1 ? undefined : maxWidth,
    height: aspectRatio >= 1 ? maxHeight : undefined
  });
};
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