diff --git a/docs/js/signature_pad.umd.min.js.map b/docs/js/signature_pad.umd.min.js.map index 359bc31e..77f34d50 100644 --- a/docs/js/signature_pad.umd.min.js.map +++ b/docs/js/signature_pad.umd.min.js.map @@ -1 +1 @@ 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\ No newline at end of file +{"version":3,"file":"signature_pad.umd.min.js","sources":["../src/point.ts","../src/bezier.ts","../src/signature_event_target.ts","../src/signature_pad.ts","../src/throttle.ts"],"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';\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 = 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 (error) {\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","/**\n * The main idea and some parts of the code (e.g. drawing variable width Bézier curve) are taken from:\n * http://corner.squareup.com/2012/07/smoother-signatures.html\n *\n * Implementation of interpolation using cubic Bézier 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 Bézier curve is taken from:\n * http://www.lemoda.net/maths/bezier-length/index.html\n */\n\nimport { Bezier } from './bezier';\nimport { BasicPoint, Point } from './point';\nimport { SignatureEventTarget } from './signature_event_target';\nimport { throttle } from './throttle';\n\ndeclare global {\n interface CSSStyleDeclaration {\n msTouchAction: string | null;\n }\n}\n\nexport type SignatureEvent = MouseEvent | Touch | PointerEvent;\n\nexport interface FromDataOptions {\n clear?: boolean;\n}\n\nexport interface ToSVGOptions {\n includeBackgroundColor?: 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 {\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 _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 /* 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 this.throttle = ('throttle' in options ? options.throttle : 16) as number; // in milisecondss\n this.minDistance = (\n 'minDistance' in options ? options.minDistance : 5\n ) as number; // 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 = (\n 'canvasContextOptions' in options ? options.canvasContextOptions : {}\n ) as CanvasRenderingContext2DSettings;\n\n this._strokeMoveUpdate = this.throttle\n ? throttle(SignaturePad.prototype._strokeUpdate, this.throttle)\n : SignaturePad.prototype._strokeUpdate;\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 }\n\n public fromDataURL(\n dataUrl: string,\n options: {\n ratio?: number;\n width?: number;\n height?: number;\n xOffset?: number;\n yOffset?: number;\n } = {},\n ): Promise {\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 });\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);\n }\n }\n\n public on(): void {\n // Disable panning/zooming when touching canvas element\n this.canvas.style.touchAction = 'none';\n this.canvas.style.msTouchAction = 'none';\n this.canvas.style.userSelect = '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 lose some of them when tapping rapidly.\n // Use touch events for iOS platforms to prevent it. 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\ No newline at end of file diff --git a/tsconfig.json b/tsconfig.json index 28f2afb3..932b30a2 100644 --- a/tsconfig.json +++ b/tsconfig.json @@ -14,6 +14,7 @@ "lib": ["DOM", "ES2015"], "sourceMap": true, + "inlineSources": true, "declaration": false } }