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NB: 'this' must be a Jimp object.\n * @param {number} deg the number of degrees to rotate the image by\n * @param {string|boolean} mode (optional) resize mode or a boolean, if false then the width and height of the image will not be changed\n */\nfunction advancedRotate(deg, mode) {\n  deg %= 360;\n  const rad = (deg * Math.PI) / 180;\n  const cosine = Math.cos(rad);\n  const sine = Math.sin(rad);\n\n  // the final width and height will change if resize == true\n  let w = this.bitmap.width;\n  let h = this.bitmap.height;\n\n  if (mode === true || typeof mode === 'string') {\n    // resize the image to it maximum dimension and blit the existing image\n    // onto the center so that when it is rotated the image is kept in bounds\n\n    // http://stackoverflow.com/questions/3231176/how-to-get-size-of-a-rotated-rectangle\n    // Plus 1 border pixel to ensure to show all rotated result for some cases.\n    w =\n      Math.ceil(\n        Math.abs(this.bitmap.width * cosine) +\n          Math.abs(this.bitmap.height * sine)\n      ) + 1;\n    h =\n      Math.ceil(\n        Math.abs(this.bitmap.width * sine) +\n          Math.abs(this.bitmap.height * cosine)\n      ) + 1;\n    // Ensure destination to have even size to a better result.\n    if (w % 2 !== 0) {\n      w++;\n    }\n\n    if (h % 2 !== 0) {\n      h++;\n    }\n\n    const c = this.cloneQuiet();\n    this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function(\n      x,\n      y,\n      idx\n    ) {\n      this.bitmap.data.writeUInt32BE(this._background, idx);\n    });\n\n    const max = Math.max(w, h, this.bitmap.width, this.bitmap.height);\n    this.resize(max, max, mode);\n\n    this.blit(\n      c,\n      this.bitmap.width / 2 - c.bitmap.width / 2,\n      this.bitmap.height / 2 - c.bitmap.height / 2\n    );\n  }\n\n  const bW = this.bitmap.width;\n  const bH = this.bitmap.height;\n  const dstBuffer = Buffer.alloc(this.bitmap.data.length);\n\n  function createTranslationFunction(deltaX, deltaY) {\n    return function(x, y) {\n      return {\n        x: x + deltaX,\n        y: y + deltaY\n      };\n    };\n  }\n\n  const translate2Cartesian = createTranslationFunction(-(bW / 2), -(bH / 2));\n  const translate2Screen = createTranslationFunction(\n    bW / 2 + 0.5,\n    bH / 2 + 0.5\n  );\n\n  for (let y = 1; y <= bH; y++) {\n    for (let x = 1; x <= bW; x++) {\n      const cartesian = translate2Cartesian(x, y);\n      const source = translate2Screen(\n        cosine * cartesian.x - sine * cartesian.y,\n        cosine * cartesian.y + sine * cartesian.x\n      );\n      const dstIdx = (bW * (y - 1) + x - 1) << 2;\n\n      if (source.x >= 0 && source.x < bW && source.y >= 0 && source.y < bH) {\n        const srcIdx = ((bW * (source.y | 0) + source.x) | 0) << 2;\n        const pixelRGBA = this.bitmap.data.readUInt32BE(srcIdx);\n        dstBuffer.writeUInt32BE(pixelRGBA, dstIdx);\n      } else {\n        // reset off-image pixels\n        dstBuffer.writeUInt32BE(this._background, dstIdx);\n      }\n    }\n  }\n\n  this.bitmap.data = dstBuffer;\n\n  if (mode === true || typeof mode === 'string') {\n    // now crop the image to the final size\n    const x = bW / 2 - w / 2;\n    const y = bH / 2 - h / 2;\n    this.crop(x, y, w, h);\n  }\n}\n\nexport default () => ({\n  /**\n   * Rotates the image clockwise by a number of degrees. By default the width and height of the image will be resized appropriately.\n   * @param {number} deg the number of degrees to rotate the image by\n   * @param {string|boolean} mode (optional) resize mode or a boolean, if false then the width and height of the image will not be changed\n   * @param {function(Error, Jimp)} cb (optional) a callback for when complete\n   * @returns {Jimp} this for chaining of methods\n   */\n  rotate(deg, mode, cb) {\n    // enable overloading\n    if (typeof mode === 'undefined' || mode === null) {\n      // e.g. image.resize(120);\n      // e.g. image.resize(120, null, cb);\n      // e.g. image.resize(120, undefined, cb);\n      mode = true;\n    }\n\n    if (typeof mode === 'function' && typeof cb === 'undefined') {\n      // e.g. image.resize(120, cb);\n      cb = mode;\n      mode = true;\n    }\n\n    if (typeof deg !== 'number') {\n      return throwError.call(this, 'deg must be a number', cb);\n    }\n\n    if (typeof mode !== 'boolean' && typeof mode !== 'string') {\n      return throwError.call(this, 'mode must be a boolean or a string', cb);\n    }\n\n    advancedRotate.call(this, deg, mode, cb);\n\n    if (isNodePattern(cb)) {\n      cb.call(this, null, this);\n    }\n\n    return this;\n  }\n});\n"],"file":"index.js"}