{
  "version": 3,
  "sources": ["../src/point.ts", "../src/bezier.ts", "../src/signature_event_target.ts", "../src/throttle.ts", "../src/signature_pad.ts", "<stdin>"],
  "sourcesContent": ["// Interface for point data structure used e.g. in SignaturePad#fromData method\nexport interface BasicPoint {\n  x: number;\n  y: number;\n  pressure: number;\n  time: number;\n}\n\nexport class Point implements BasicPoint {\n  public x: number;\n  public y: number;\n  public pressure: number;\n  public time: number;\n\n  constructor(x: number, y: number, pressure?: number, time?: number) {\n    if (isNaN(x) || isNaN(y)) {\n      throw new Error(`Point is invalid: (${x}, ${y})`);\n    }\n    this.x = +x;\n    this.y = +y;\n    this.pressure = pressure || 0;\n    this.time = time || Date.now();\n  }\n\n  public distanceTo(start: BasicPoint): number {\n    return Math.sqrt(\n      Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2),\n    );\n  }\n\n  public equals(other: BasicPoint): boolean {\n    return (\n      this.x === other.x &&\n      this.y === other.y &&\n      this.pressure === other.pressure &&\n      this.time === other.time\n    );\n  }\n\n  public velocityFrom(start: BasicPoint): number {\n    return this.time !== start.time\n      ? this.distanceTo(start) / (this.time - start.time)\n      : 0;\n  }\n}\n", "import { BasicPoint, Point } from './point.js';\n\nexport class Bezier {\n  public static fromPoints(\n    points: Point[],\n    widths: { start: number; end: number },\n  ): Bezier {\n    const c2 = this.calculateControlPoints(points[0], points[1], points[2]).c2;\n    const c3 = this.calculateControlPoints(points[1], points[2], points[3]).c1;\n\n    return new Bezier(points[1], c2, c3, points[2], widths.start, widths.end);\n  }\n\n  private static calculateControlPoints(\n    s1: BasicPoint,\n    s2: BasicPoint,\n    s3: BasicPoint,\n  ): {\n    c1: BasicPoint;\n    c2: BasicPoint;\n  } {\n    const dx1 = s1.x - s2.x;\n    const dy1 = s1.y - s2.y;\n    const dx2 = s2.x - s3.x;\n    const dy2 = s2.y - s3.y;\n\n    const m1 = { x: (s1.x + s2.x) / 2.0, y: (s1.y + s2.y) / 2.0 };\n    const m2 = { x: (s2.x + s3.x) / 2.0, y: (s2.y + s3.y) / 2.0 };\n\n    const l1 = Math.sqrt(dx1 * dx1 + dy1 * dy1);\n    const l2 = Math.sqrt(dx2 * dx2 + dy2 * dy2);\n\n    const dxm = m1.x - m2.x;\n    const dym = m1.y - m2.y;\n\n    const k = l1 + l2 == 0 ? 0 : l2 / (l1 + l2);\n    const cm = { x: m2.x + dxm * k, y: m2.y + dym * k };\n\n    const tx = s2.x - cm.x;\n    const ty = s2.y - cm.y;\n\n    return {\n      c1: new Point(m1.x + tx, m1.y + ty),\n      c2: new Point(m2.x + tx, m2.y + ty),\n    };\n  }\n\n  constructor(\n    public startPoint: Point,\n    public control2: BasicPoint,\n    public control1: BasicPoint,\n    public endPoint: Point,\n    public startWidth: number,\n    public endWidth: number,\n  ) {}\n\n  // Returns approximated length. Code taken from https://www.lemoda.net/maths/bezier-length/index.html.\n  public length(): number {\n    const steps = 10;\n    let length = 0;\n    let px;\n    let py;\n\n    for (let i = 0; i <= steps; i += 1) {\n      const t = i / steps;\n      const cx = this.point(\n        t,\n        this.startPoint.x,\n        this.control1.x,\n        this.control2.x,\n        this.endPoint.x,\n      );\n      const cy = this.point(\n        t,\n        this.startPoint.y,\n        this.control1.y,\n        this.control2.y,\n        this.endPoint.y,\n      );\n\n      if (i > 0) {\n        const xdiff = cx - (px as number);\n        const ydiff = cy - (py as number);\n\n        length += Math.sqrt(xdiff * xdiff + ydiff * ydiff);\n      }\n\n      px = cx;\n      py = cy;\n    }\n\n    return length;\n  }\n\n  // Calculate parametric value of x or y given t and the four point coordinates of a cubic bezier curve.\n  private point(\n    t: number,\n    start: number,\n    c1: number,\n    c2: number,\n    end: number,\n  ): number {\n    // prettier-ignore\n    return (       start * (1.0 - t) * (1.0 - t)  * (1.0 - t))\n         + (3.0 *  c1    * (1.0 - t) * (1.0 - t)  * t)\n         + (3.0 *  c2    * (1.0 - t) * t          * t)\n         + (       end   * t         * t          * t);\n  }\n}\n", "export class SignatureEventTarget {\n  /* tslint:disable: variable-name */\n  private _et: EventTarget;\n  /* tslint:enable: variable-name */\n\n  constructor() {\n    try {\n      this._et = new EventTarget();\n    } catch {\n      // Using document as EventTarget to support iOS 13 and older.\n      // Because EventTarget constructor just exists at iOS 14 and later.\n      this._et = document;\n    }\n  }\n\n  addEventListener(\n    type: string,\n    listener: EventListenerOrEventListenerObject | null,\n    options?: boolean | AddEventListenerOptions,\n  ): void {\n    this._et.addEventListener(type, listener, options);\n  }\n\n  dispatchEvent(event: Event): boolean {\n    return this._et.dispatchEvent(event);\n  }\n\n  removeEventListener(\n    type: string,\n    callback: EventListenerOrEventListenerObject | null,\n    options?: boolean | EventListenerOptions,\n  ): void {\n    this._et.removeEventListener(type, callback, options);\n  }\n}\n", "/* eslint-disable @typescript-eslint/no-explicit-any, @typescript-eslint/no-this-alias */\n// Slightly simplified version of http://stackoverflow.com/a/27078401/815507\n\nexport function throttle(\n  fn: (...args: any[]) => any,\n  wait = 250,\n): (this: any, ...args: any[]) => any {\n  let previous = 0;\n  let timeout: number | null = null;\n  let result: any;\n  let storedContext: any;\n  let storedArgs: any[];\n\n  const later = (): void => {\n    previous = Date.now();\n    timeout = null;\n    result = fn.apply(storedContext, storedArgs);\n\n    if (!timeout) {\n      storedContext = null;\n      storedArgs = [];\n    }\n  };\n\n  return function wrapper(this: any, ...args: any[]): any {\n    const now = Date.now();\n    const remaining = wait - (now - previous);\n\n    storedContext = this;\n    storedArgs = args;\n\n    if (remaining <= 0 || remaining > wait) {\n      if (timeout) {\n        clearTimeout(timeout);\n        timeout = null;\n      }\n\n      previous = now;\n      result = fn.apply(storedContext, storedArgs);\n\n      if (!timeout) {\n        storedContext = null;\n        storedArgs = [];\n      }\n    } else if (!timeout) {\n      timeout = window.setTimeout(later, remaining);\n    }\n\n    return result;\n  };\n}\n", "/**\n * The main idea and some parts of the code (e.g. drawing variable width B\u00E9zier curve) are taken from:\n * http://corner.squareup.com/2012/07/smoother-signatures.html\n *\n * Implementation of interpolation using cubic B\u00E9zier curves is taken from:\n * https://web.archive.org/web/20160323213433/http://www.benknowscode.com/2012/09/path-interpolation-using-cubic-bezier_9742.html\n *\n * Algorithm for approximated length of a B\u00E9zier curve is taken from:\n * http://www.lemoda.net/maths/bezier-length/index.html\n */\n\nimport { Bezier } from './bezier.js';\nimport { BasicPoint, Point } from './point.js';\nimport { SignatureEventTarget } from './signature_event_target.js';\nimport { throttle } from './throttle.js';\n\nexport { BasicPoint } from './point.js';\n\nexport interface SignatureEvent {\n  event: MouseEvent | TouchEvent | PointerEvent;\n  type: string;\n  x: number;\n  y: number;\n  pressure: number;\n}\n\nexport interface FromDataOptions {\n  clear?: boolean;\n}\n\nexport interface FromDataUrlOptions {\n  ratio?: number;\n  width?: number;\n  height?: number;\n  xOffset?: number;\n  yOffset?: number;\n}\n\nexport interface ToSVGOptions {\n  includeBackgroundColor?: boolean;\n  includeDataUrl?: boolean;\n}\n\nexport interface PointGroupOptions {\n  dotSize: number;\n  minWidth: number;\n  maxWidth: number;\n  penColor: string;\n  velocityFilterWeight: number;\n  /**\n   * This is the globalCompositeOperation for the line.\n   * *default: 'source-over'*\n   * @see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation\n   */\n  compositeOperation: GlobalCompositeOperation;\n}\n\nexport interface Options extends Partial<PointGroupOptions> {\n  minDistance?: number;\n  backgroundColor?: string;\n  throttle?: number;\n  canvasContextOptions?: CanvasRenderingContext2DSettings;\n}\n\nexport interface PointGroup extends PointGroupOptions {\n  points: BasicPoint[];\n}\n\nexport default class SignaturePad extends SignatureEventTarget {\n  // Public stuff\n  public dotSize: number;\n  public minWidth: number;\n  public maxWidth: number;\n  public penColor: string;\n  public minDistance: number;\n  public velocityFilterWeight: number;\n  public compositeOperation: GlobalCompositeOperation;\n  public backgroundColor: string;\n  public throttle: number;\n  public canvasContextOptions: CanvasRenderingContext2DSettings;\n\n  // Private stuff\n  /* tslint:disable: variable-name */\n  private _ctx: CanvasRenderingContext2D;\n  private _drawingStroke = false;\n  private _isEmpty = true;\n  private _dataUrl: string | undefined;\n  private _dataUrlOptions: FromDataUrlOptions | undefined;\n  private _lastPoints: Point[] = []; // Stores up to 4 most recent points; used to generate a new curve\n  private _data: PointGroup[] = []; // Stores all points in groups (one group per line or dot)\n  private _lastVelocity = 0;\n  private _lastWidth = 0;\n  private _strokeMoveUpdate: (event: SignatureEvent) => void;\n  private _strokePointerId: number | undefined;\n  /* tslint:enable: variable-name */\n\n  constructor(\n    private canvas: HTMLCanvasElement,\n    options: Options = {},\n  ) {\n    super();\n    this.velocityFilterWeight = options.velocityFilterWeight || 0.7;\n    this.minWidth = options.minWidth || 0.5;\n    this.maxWidth = options.maxWidth || 2.5;\n\n    // We need to handle 0 value, so use `??` instead of `||`\n    this.throttle = options.throttle ?? 16; // in milliseconds\n    this.minDistance = options.minDistance ?? 5; // in pixels\n    this.dotSize = options.dotSize || 0;\n    this.penColor = options.penColor || 'black';\n    this.backgroundColor = options.backgroundColor || 'rgba(0,0,0,0)';\n    this.compositeOperation = options.compositeOperation || 'source-over';\n    this.canvasContextOptions = options.canvasContextOptions ?? {};\n\n    this._strokeMoveUpdate = this.throttle\n      ? throttle(SignaturePad.prototype._strokeUpdate, this.throttle)\n      : SignaturePad.prototype._strokeUpdate;\n\n    this._handleMouseDown = this._handleMouseDown.bind(this);\n    this._handleMouseMove = this._handleMouseMove.bind(this);\n    this._handleMouseUp = this._handleMouseUp.bind(this);\n    this._handleTouchStart = this._handleTouchStart.bind(this);\n    this._handleTouchMove = this._handleTouchMove.bind(this);\n    this._handleTouchEnd = this._handleTouchEnd.bind(this);\n    this._handlePointerDown = this._handlePointerDown.bind(this);\n    this._handlePointerMove = this._handlePointerMove.bind(this);\n    this._handlePointerUp = this._handlePointerUp.bind(this);\n    this._handlePointerCancel = this._handlePointerCancel.bind(this);\n    this._handleTouchCancel = this._handleTouchCancel.bind(this);\n\n    this._ctx = canvas.getContext(\n      '2d',\n      this.canvasContextOptions,\n    ) as CanvasRenderingContext2D;\n\n    this.clear();\n\n    // Enable mouse and touch event handlers\n    this.on();\n  }\n\n  public clear(): void {\n    const { _ctx: ctx, canvas } = this;\n\n    // Clear canvas using background color\n    ctx.fillStyle = this.backgroundColor;\n    ctx.clearRect(0, 0, canvas.width, canvas.height);\n    ctx.fillRect(0, 0, canvas.width, canvas.height);\n\n    this._data = [];\n    this._reset(this._getPointGroupOptions());\n    this._isEmpty = true;\n    this._dataUrl = undefined;\n    this._dataUrlOptions = undefined;\n    this._strokePointerId = undefined;\n  }\n\n  public redraw(): void {\n    const data = this._data;\n    const dataUrl = this._dataUrl;\n    const dataUrlOptions = this._dataUrlOptions;\n\n    this.clear();\n    if (dataUrl) {\n      this.fromDataURL(dataUrl, dataUrlOptions);\n    }\n    this.fromData(data, { clear: false });\n  }\n\n  public fromDataURL(\n    dataUrl: string,\n    options: FromDataUrlOptions = {},\n  ): Promise<void> {\n    return new Promise((resolve, reject) => {\n      const image = new Image();\n      const ratio = options.ratio || window.devicePixelRatio || 1;\n      const width = options.width || this.canvas.width / ratio;\n      const height = options.height || this.canvas.height / ratio;\n      const xOffset = options.xOffset || 0;\n      const yOffset = options.yOffset || 0;\n\n      this._reset(this._getPointGroupOptions());\n\n      image.onload = (): void => {\n        this._ctx.drawImage(image, xOffset, yOffset, width, height);\n        resolve();\n      };\n      image.onerror = (error): void => {\n        reject(error);\n      };\n      image.crossOrigin = 'anonymous';\n      image.src = dataUrl;\n\n      this._isEmpty = false;\n      this._dataUrl = dataUrl;\n      this._dataUrlOptions = {...options};\n    });\n  }\n\n  public toDataURL(\n    type: 'image/svg+xml',\n    encoderOptions?: ToSVGOptions,\n  ): string;\n  public toDataURL(type?: string, encoderOptions?: number): string;\n  public toDataURL(\n    type = 'image/png',\n    encoderOptions?: number | ToSVGOptions | undefined,\n  ): string {\n    switch (type) {\n      case 'image/svg+xml':\n        if (typeof encoderOptions !== 'object') {\n          encoderOptions = undefined;\n        }\n        return `data:image/svg+xml;base64,${btoa(\n          this.toSVG(encoderOptions as ToSVGOptions),\n        )}`;\n      default:\n        if (typeof encoderOptions !== 'number') {\n          encoderOptions = undefined;\n        }\n        return this.canvas.toDataURL(type, encoderOptions as number);\n    }\n  }\n\n  public on(): void {\n    // Disable panning/zooming when touching canvas element\n    this.canvas.style.touchAction = 'none';\n    (\n      this.canvas.style as CSSStyleDeclaration & {\n        msTouchAction: string | null;\n      }\n    ).msTouchAction = 'none';\n    this.canvas.style.userSelect = 'none';\n    // Safari does not support userSelect property without a prefix even as of iOS 26\n    // https://caniuse.com/?search=user-select\n    this.canvas.style.webkitUserSelect = 'none';\n\n    const isIOS =\n      /Macintosh/.test(navigator.userAgent) && 'ontouchstart' in document;\n\n    // The \"Scribble\" feature of iOS intercepts point events. So that we can\n    // lose some of them when tapping rapidly. Use touch events for iOS\n    // platforms to prevent it. See\n    // https://developer.apple.com/forums/thread/664108 for more information.\n    if (window.PointerEvent && !isIOS) {\n      this._handlePointerEvents();\n    } else {\n      this._handleMouseEvents();\n\n      if ('ontouchstart' in window) {\n        this._handleTouchEvents();\n      }\n    }\n  }\n\n  public off(): void {\n    // Enable panning/zooming when touching canvas element\n    this.canvas.style.touchAction = 'auto';\n    (\n      this.canvas.style as CSSStyleDeclaration & {\n        msTouchAction: string | null;\n      }\n    ).msTouchAction = 'auto';\n    this.canvas.style.userSelect = 'auto';\n    this.canvas.style.webkitUserSelect = 'auto';\n\n    this.canvas.removeEventListener('pointerdown', this._handlePointerDown);\n    this.canvas.removeEventListener('mousedown', this._handleMouseDown);\n    this.canvas.removeEventListener('touchstart', this._handleTouchStart);\n\n    this._removeMoveUpEventListeners();\n  }\n\n  private _getListenerFunctions() {\n    const canvasWindow =\n      window.document === this.canvas.ownerDocument\n        ? window\n        : (this.canvas.ownerDocument.defaultView ?? this.canvas.ownerDocument);\n\n    return {\n      addEventListener: canvasWindow.addEventListener.bind(\n        canvasWindow,\n      ) as typeof window.addEventListener,\n      removeEventListener: canvasWindow.removeEventListener.bind(\n        canvasWindow,\n      ) as typeof window.removeEventListener,\n    };\n  }\n\n  private _removeMoveUpEventListeners(): void {\n    const { removeEventListener } = this._getListenerFunctions();\n    removeEventListener('pointermove', this._handlePointerMove);\n    removeEventListener('pointerup', this._handlePointerUp);\n    removeEventListener('pointercancel', this._handlePointerCancel);\n\n    removeEventListener('mousemove', this._handleMouseMove);\n    removeEventListener('mouseup', this._handleMouseUp);\n\n    removeEventListener('touchmove', this._handleTouchMove);\n    removeEventListener('touchend', this._handleTouchEnd);\n    removeEventListener('touchcancel', this._handleTouchCancel);\n  }\n\n  public isEmpty(): boolean {\n    return this._isEmpty;\n  }\n\n  public fromData(\n    pointGroups: PointGroup[],\n    { clear = true }: FromDataOptions = {},\n  ): void {\n    if (clear) {\n      this.clear();\n    }\n\n    this._fromData(\n      pointGroups,\n      this._drawCurve.bind(this),\n      this._drawDot.bind(this),\n    );\n\n    this._data = this._data.concat(pointGroups);\n  }\n\n  public toData(): PointGroup[] {\n    return this._data;\n  }\n\n  private _isLeftButtonPressed(event: MouseEvent, only?: boolean): boolean {\n    if (only) {\n      return event.buttons === 1;\n    }\n\n    return (event.buttons & 1) === 1;\n  }\n  private _pointerEventToSignatureEvent(\n    event: MouseEvent | PointerEvent,\n  ): SignatureEvent {\n    return {\n      event: event,\n      type: event.type,\n      x: event.clientX,\n      y: event.clientY,\n      pressure: 'pressure' in event ? event.pressure : 0,\n    };\n  }\n\n  private _touchEventToSignatureEvent(event: TouchEvent): SignatureEvent {\n    const touch = event.changedTouches[0];\n    return {\n      event: event,\n      type: event.type,\n      x: touch.clientX,\n      y: touch.clientY,\n      pressure: touch.force,\n    };\n  }\n\n  // Event handlers\n  private _handleMouseDown(event: MouseEvent): void {\n    if (!this._isLeftButtonPressed(event, true) || this._drawingStroke) {\n      return;\n    }\n    this._strokeBegin(this._pointerEventToSignatureEvent(event));\n  }\n\n  private _handleMouseMove(event: MouseEvent): void {\n    if (!this._isLeftButtonPressed(event, true) || !this._drawingStroke) {\n      // Stop when not pressing primary button or pressing multiple buttons\n      this._strokeEnd(this._pointerEventToSignatureEvent(event), false);\n      return;\n    }\n\n    this._strokeMoveUpdate(this._pointerEventToSignatureEvent(event));\n  }\n\n  private _handleMouseUp(event: MouseEvent): void {\n    if (this._isLeftButtonPressed(event)) {\n      return;\n    }\n\n    this._strokeEnd(this._pointerEventToSignatureEvent(event));\n  }\n\n  private _handleTouchStart(event: TouchEvent): void {\n    if (event.targetTouches.length !== 1 || this._drawingStroke) {\n      return;\n    }\n\n    // Prevent scrolling.\n    if (event.cancelable) {\n      event.preventDefault();\n    }\n\n    this._strokeBegin(this._touchEventToSignatureEvent(event));\n  }\n\n  private _handleTouchMove(event: TouchEvent): void {\n    if (event.targetTouches.length !== 1) {\n      return;\n    }\n\n    // Prevent scrolling.\n    if (event.cancelable) {\n      event.preventDefault();\n    }\n\n    if (!this._drawingStroke) {\n      this._strokeEnd(this._touchEventToSignatureEvent(event), false);\n      return;\n    }\n\n    this._strokeMoveUpdate(this._touchEventToSignatureEvent(event));\n  }\n\n  private _handleTouchEnd(event: TouchEvent): void {\n    if (event.targetTouches.length !== 0) {\n      return;\n    }\n\n    if (event.cancelable) {\n      event.preventDefault();\n    }\n\n    this._strokeEnd(this._touchEventToSignatureEvent(event));\n  }\n\n  private _handlePointerCancel(event: PointerEvent): void {\n    if (!this._allowPointerId(event)) {\n      return;\n    }\n\n    event.preventDefault();\n    this._strokeEnd(this._pointerEventToSignatureEvent(event), false);\n  }\n\n  private _handleTouchCancel(event: TouchEvent): void {\n    if (event.cancelable) {\n      event.preventDefault();\n    }\n\n    this._strokeEnd(this._touchEventToSignatureEvent(event), false);\n  }\n\n  private _getPointerId(event: PointerEvent) {\n    // @ts-expect-error persistentDeviceId is not available yet but we want to use it when it is available\n    return event.persistentDeviceId || event.pointerId;\n  }\n\n  private _allowPointerId(\n    event: PointerEvent,\n    allowUndefined = false,\n  ): boolean {\n    if (typeof this._strokePointerId === 'undefined') {\n      return allowUndefined;\n    }\n\n    return this._getPointerId(event) === this._strokePointerId;\n  }\n\n  private _handlePointerDown(event: PointerEvent): void {\n    if (\n      this._drawingStroke ||\n      !this._isLeftButtonPressed(event) ||\n      !this._allowPointerId(event, true)\n    ) {\n      return;\n    }\n\n    this._strokePointerId = this._getPointerId(event);\n\n    event.preventDefault();\n\n    this._strokeBegin(this._pointerEventToSignatureEvent(event));\n  }\n\n  private _handlePointerMove(event: PointerEvent): void {\n    if (!this._allowPointerId(event)) {\n      return;\n    }\n    if (!this._isLeftButtonPressed(event, true) || !this._drawingStroke) {\n      // Stop when primary button not pressed or multiple buttons pressed\n      this._strokeEnd(this._pointerEventToSignatureEvent(event), false);\n      return;\n    }\n\n    event.preventDefault();\n    this._strokeMoveUpdate(this._pointerEventToSignatureEvent(event));\n  }\n\n  private _handlePointerUp(event: PointerEvent): void {\n    if (this._isLeftButtonPressed(event) || !this._allowPointerId(event)) {\n      return;\n    }\n\n    event.preventDefault();\n    this._strokeEnd(this._pointerEventToSignatureEvent(event));\n  }\n\n  private _getPointGroupOptions(group?: PointGroup): PointGroupOptions {\n    return {\n      penColor: group && 'penColor' in group ? group.penColor : this.penColor,\n      dotSize: group && 'dotSize' in group ? group.dotSize : this.dotSize,\n      minWidth: group && 'minWidth' in group ? group.minWidth : this.minWidth,\n      maxWidth: group && 'maxWidth' in group ? group.maxWidth : this.maxWidth,\n      velocityFilterWeight:\n        group && 'velocityFilterWeight' in group\n          ? group.velocityFilterWeight\n          : this.velocityFilterWeight,\n      compositeOperation:\n        group && 'compositeOperation' in group\n          ? group.compositeOperation\n          : this.compositeOperation,\n    };\n  }\n\n  // Private methods\n  private _strokeBegin(event: SignatureEvent): void {\n    const cancelled = !this.dispatchEvent(\n      new CustomEvent('beginStroke', { detail: event, cancelable: true }),\n    );\n    if (cancelled) {\n      return;\n    }\n\n    const { addEventListener } = this._getListenerFunctions();\n    switch (event.event.type) {\n      case 'mousedown':\n        addEventListener('mousemove', this._handleMouseMove, {\n          passive: false,\n        });\n        addEventListener('mouseup', this._handleMouseUp, { passive: false });\n        break;\n      case 'touchstart':\n        addEventListener('touchmove', this._handleTouchMove, {\n          passive: false,\n        });\n        addEventListener('touchend', this._handleTouchEnd, { passive: false });\n        addEventListener('touchcancel', this._handleTouchCancel, { passive: false });\n        break;\n      case 'pointerdown':\n        addEventListener('pointermove', this._handlePointerMove, {\n          passive: false,\n        });\n        addEventListener('pointerup', this._handlePointerUp, {\n          passive: false,\n        });\n        addEventListener('pointercancel', this._handlePointerCancel, {\n          passive: false,\n        });\n        break;\n      default:\n      // do nothing\n    }\n\n    this._drawingStroke = true;\n\n    const pointGroupOptions = this._getPointGroupOptions();\n\n    const newPointGroup: PointGroup = {\n      ...pointGroupOptions,\n      points: [],\n    };\n\n    this._data.push(newPointGroup);\n    this._reset(pointGroupOptions);\n    this._strokeUpdate(event);\n  }\n\n  private _strokeUpdate(event: SignatureEvent): void {\n    if (!this._drawingStroke) {\n      return;\n    }\n\n    if (this._data.length === 0) {\n      // This can happen if clear() was called while a signature is still in progress,\n      // or if there is a race condition between start/update events.\n      this._strokeBegin(event);\n      return;\n    }\n\n    this.dispatchEvent(\n      new CustomEvent('beforeUpdateStroke', { detail: event }),\n    );\n\n    const point = this._createPoint(event.x, event.y, event.pressure);\n    const lastPointGroup = this._data[this._data.length - 1];\n    const lastPoints = lastPointGroup.points;\n    const lastPoint =\n      lastPoints.length > 0 && lastPoints[lastPoints.length - 1];\n    const isLastPointTooClose = lastPoint\n      ? point.distanceTo(lastPoint) <= this.minDistance\n      : false;\n    const pointGroupOptions = this._getPointGroupOptions(lastPointGroup);\n\n    // Skip this point if it's too close to the previous one\n    if (!lastPoint || !(lastPoint && isLastPointTooClose)) {\n      const curve = this._addPoint(point, pointGroupOptions);\n\n      if (!lastPoint) {\n        this._drawDot(point, pointGroupOptions);\n      } else if (curve) {\n        this._drawCurve(curve, pointGroupOptions);\n      }\n\n      lastPoints.push({\n        time: point.time,\n        x: point.x,\n        y: point.y,\n        pressure: point.pressure,\n      });\n    }\n\n    this.dispatchEvent(new CustomEvent('afterUpdateStroke', { detail: event }));\n  }\n\n  private _strokeEnd(event: SignatureEvent, shouldUpdate = true): void {\n    this._removeMoveUpEventListeners();\n\n    if (!this._drawingStroke) {\n      return;\n    }\n\n    if (shouldUpdate) {\n      this._strokeUpdate(event);\n    }\n\n    this._drawingStroke = false;\n    this._strokePointerId = undefined;\n    this.dispatchEvent(new CustomEvent('endStroke', { detail: event }));\n  }\n\n  private _handlePointerEvents(): void {\n    this._drawingStroke = false;\n\n    this.canvas.addEventListener('pointerdown', this._handlePointerDown, {\n      passive: false,\n    });\n  }\n\n  private _handleMouseEvents(): void {\n    this._drawingStroke = false;\n\n    this.canvas.addEventListener('mousedown', this._handleMouseDown, {\n      passive: false,\n    });\n  }\n\n  private _handleTouchEvents(): void {\n    this.canvas.addEventListener('touchstart', this._handleTouchStart, {\n      passive: false,\n    });\n  }\n\n  // Called when a new line is started\n  private _reset(options: PointGroupOptions): void {\n    this._lastPoints = [];\n    this._lastVelocity = 0;\n    this._lastWidth = (options.minWidth + options.maxWidth) / 2;\n    this._ctx.fillStyle = options.penColor;\n    this._ctx.globalCompositeOperation = options.compositeOperation;\n  }\n\n  private _createPoint(x: number, y: number, pressure: number): Point {\n    const rect = this.canvas.getBoundingClientRect();\n\n    return new Point(\n      x - rect.left,\n      y - rect.top,\n      pressure,\n      new Date().getTime(),\n    );\n  }\n\n  // Add point to _lastPoints array and generate a new curve if there are enough points (i.e. 3)\n  private _addPoint(point: Point, options: PointGroupOptions): Bezier | null {\n    const { _lastPoints } = this;\n\n    _lastPoints.push(point);\n\n    if (_lastPoints.length > 2) {\n      // To reduce the initial lag make it work with 3 points\n      // by copying the first point to the beginning.\n      if (_lastPoints.length === 3) {\n        _lastPoints.unshift(_lastPoints[0]);\n      }\n\n      // _points array will always have 4 points here.\n      const widths = this._calculateCurveWidths(\n        _lastPoints[1],\n        _lastPoints[2],\n        options,\n      );\n      const curve = Bezier.fromPoints(_lastPoints, widths);\n\n      // Remove the first element from the list, so that there are no more than 4 points at any time.\n      _lastPoints.shift();\n\n      return curve;\n    }\n\n    return null;\n  }\n\n  private _calculateCurveWidths(\n    startPoint: Point,\n    endPoint: Point,\n    options: PointGroupOptions,\n  ): { start: number; end: number } {\n    const velocity =\n      options.velocityFilterWeight * endPoint.velocityFrom(startPoint) +\n      (1 - options.velocityFilterWeight) * this._lastVelocity;\n\n    const newWidth = this._strokeWidth(velocity, options);\n\n    const widths = {\n      end: newWidth,\n      start: this._lastWidth,\n    };\n\n    this._lastVelocity = velocity;\n    this._lastWidth = newWidth;\n\n    return widths;\n  }\n\n  private _strokeWidth(velocity: number, options: PointGroupOptions): number {\n    return Math.max(options.maxWidth / (velocity + 1), options.minWidth);\n  }\n\n  private _drawCurveSegment(x: number, y: number, width: number): void {\n    const ctx = this._ctx;\n\n    ctx.moveTo(x, y);\n    ctx.arc(x, y, width, 0, 2 * Math.PI, false);\n    this._isEmpty = false;\n  }\n\n  private _drawCurve(curve: Bezier, options: PointGroupOptions): void {\n    const ctx = this._ctx;\n    const widthDelta = curve.endWidth - curve.startWidth;\n    // '2' is just an arbitrary number here. If only length is used, then\n    // there are gaps between curve segments :/\n    const drawSteps = Math.ceil(curve.length()) * 2;\n\n    ctx.beginPath();\n    ctx.fillStyle = options.penColor;\n\n    for (let i = 0; i < drawSteps; i += 1) {\n      // Calculate the Bezier (x, y) coordinate for this step.\n      const t = i / drawSteps;\n      const tt = t * t;\n      const ttt = tt * t;\n      const u = 1 - t;\n      const uu = u * u;\n      const uuu = uu * u;\n\n      let x = uuu * curve.startPoint.x;\n      x += 3 * uu * t * curve.control1.x;\n      x += 3 * u * tt * curve.control2.x;\n      x += ttt * curve.endPoint.x;\n\n      let y = uuu * curve.startPoint.y;\n      y += 3 * uu * t * curve.control1.y;\n      y += 3 * u * tt * curve.control2.y;\n      y += ttt * curve.endPoint.y;\n\n      const width = Math.min(\n        curve.startWidth + ttt * widthDelta,\n        options.maxWidth,\n      );\n      this._drawCurveSegment(x, y, width);\n    }\n\n    ctx.closePath();\n    ctx.fill();\n  }\n\n  private _drawDot(point: BasicPoint, options: PointGroupOptions): void {\n    const ctx = this._ctx;\n    const width =\n      options.dotSize > 0\n        ? options.dotSize\n        : (options.minWidth + options.maxWidth) / 2;\n\n    ctx.beginPath();\n    this._drawCurveSegment(point.x, point.y, width);\n    ctx.closePath();\n    ctx.fillStyle = options.penColor;\n    ctx.fill();\n  }\n\n  private _fromData(\n    pointGroups: PointGroup[],\n    drawCurve: SignaturePad['_drawCurve'],\n    drawDot: SignaturePad['_drawDot'],\n  ): void {\n    for (const group of pointGroups) {\n      const { points } = group;\n      const pointGroupOptions = this._getPointGroupOptions(group);\n\n      if (points.length > 1) {\n        for (let j = 0; j < points.length; j += 1) {\n          const basicPoint = points[j];\n          const point = new Point(\n            basicPoint.x,\n            basicPoint.y,\n            basicPoint.pressure,\n            basicPoint.time,\n          );\n\n          if (j === 0) {\n            this._reset(pointGroupOptions);\n          }\n\n          const curve = this._addPoint(point, pointGroupOptions);\n\n          if (curve) {\n            drawCurve(curve, pointGroupOptions);\n          }\n        }\n      } else {\n        this._reset(pointGroupOptions);\n\n        drawDot(points[0], pointGroupOptions);\n      }\n    }\n  }\n\n  public toSVG({ includeBackgroundColor = false, includeDataUrl = false }: ToSVGOptions = {}): string {\n    const pointGroups = this._data;\n    const ratio = Math.max(window.devicePixelRatio || 1, 1);\n    const minX = 0;\n    const minY = 0;\n    const maxX = this.canvas.width / ratio;\n    const maxY = this.canvas.height / ratio;\n    const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');\n\n    svg.setAttribute('xmlns', 'http://www.w3.org/2000/svg');\n    svg.setAttribute('xmlns:xlink', 'http://www.w3.org/1999/xlink');\n    svg.setAttribute('viewBox', `${minX} ${minY} ${maxX} ${maxY}`);\n    svg.setAttribute('width', maxX.toString());\n    svg.setAttribute('height', maxY.toString());\n\n    if (includeBackgroundColor && this.backgroundColor) {\n      const rect = document.createElement('rect');\n      rect.setAttribute('width', '100%');\n      rect.setAttribute('height', '100%');\n      rect.setAttribute('fill', this.backgroundColor);\n\n      svg.appendChild(rect);\n    }\n\n    if (includeDataUrl && this._dataUrl) {\n      const ratio = this._dataUrlOptions?.ratio || window.devicePixelRatio || 1;\n      const width = this._dataUrlOptions?.width || this.canvas.width / ratio;\n      const height = this._dataUrlOptions?.height || this.canvas.height / ratio;\n      const xOffset = this._dataUrlOptions?.xOffset || 0;\n      const yOffset = this._dataUrlOptions?.yOffset || 0;\n\n      const image = document.createElement('image');\n      image.setAttribute('x', xOffset.toString());\n      image.setAttribute('y', yOffset.toString());\n      image.setAttribute('width', width.toString());\n      image.setAttribute('height', height.toString());\n      image.setAttribute('preserveAspectRatio', 'none');\n      image.setAttribute('href', this._dataUrl);\n\n      svg.appendChild(image);\n    }\n\n    this._fromData(\n      pointGroups,\n\n      (curve, { penColor }) => {\n        const path = document.createElement('path');\n\n        // Need to check curve for NaN values, these pop up when drawing\n        // lines on the canvas that are not continuous. E.g. Sharp corners\n        // or stopping mid-stroke and than continuing without lifting mouse.\n        if (\n          !isNaN(curve.control1.x) &&\n          !isNaN(curve.control1.y) &&\n          !isNaN(curve.control2.x) &&\n          !isNaN(curve.control2.y)\n        ) {\n          const attr =\n            `M ${curve.startPoint.x.toFixed(3)},${curve.startPoint.y.toFixed(\n              3,\n            )} ` +\n            `C ${curve.control1.x.toFixed(3)},${curve.control1.y.toFixed(3)} ` +\n            `${curve.control2.x.toFixed(3)},${curve.control2.y.toFixed(3)} ` +\n            `${curve.endPoint.x.toFixed(3)},${curve.endPoint.y.toFixed(3)}`;\n          path.setAttribute('d', attr);\n          path.setAttribute('stroke-width', (curve.endWidth * 2.25).toFixed(3));\n          path.setAttribute('stroke', penColor);\n          path.setAttribute('fill', 'none');\n          path.setAttribute('stroke-linecap', 'round');\n\n          svg.appendChild(path);\n        }\n      },\n\n      (point, { penColor, dotSize, minWidth, maxWidth }) => {\n        const circle = document.createElement('circle');\n        const size = dotSize > 0 ? dotSize : (minWidth + maxWidth) / 2;\n        circle.setAttribute('r', size.toString());\n        circle.setAttribute('cx', point.x.toString());\n        circle.setAttribute('cy', point.y.toString());\n        circle.setAttribute('fill', penColor);\n\n        svg.appendChild(circle);\n      },\n    );\n\n    return svg.outerHTML;\n  }\n}\n", "module.exports = require(\"./src/signature_pad.ts\").default"],
  "mappings": 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}