react-native-vision-camera/lib/module/RotationHelper.js

A powerful, high-performance React Native Camera library.

function orientationToDegrees(orientation) {
  switch (orientation) {
    case 'portrait':
      return 0;
    case 'landscape-right':
      return 90;
    case 'portrait-upside-down':
      return 180;
    case 'landscape-left':
      return 270;
  }
}
export class RotationHelper {
  /**
   * Gets or sets the current preview orientation.
   */
  previewOrientation = 'portrait';
  /**
   * Gets or sets the current output orientation.
   */
  outputOrientation = 'portrait';

  /**
   * Gets the current target rotation (in degrees) that needs to be applied
   * to all UI elements so they appear up-right.
   */
  get uiRotation() {
    const previewDegrees = orientationToDegrees(this.previewOrientation);
    const outputDegrees = orientationToDegrees(this.outputOrientation);
    const diffDegrees = (outputDegrees - previewDegrees) % 360;
    if (diffDegrees < -180) {
      // Changes e.g. -270 to +90, so it is a shorter rotation on UI
      return diffDegrees + 360;
    } else if (diffDegrees > 180) {
      // Changes e.g. +270 to -90, so it is a shorter rotation on UI
      return diffDegrees - 360;
    } else {
      // It is a short rotation already, return it
      return diffDegrees;
    }
  }
}
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