signature_pad
Version:
Library for drawing smooth signatures.
900 lines (892 loc) • 32.5 kB
JavaScript
/*!
* Signature Pad v5.1.4 | https://github.com/szimek/signature_pad
* (c) 2026 Szymon Nowak | Released under the MIT license
*/
(function(g,f){if(typeof exports=="object"&&typeof module<"u"){module.exports=f()}else if("function"==typeof define && define.amd){define("SignaturePad",f)}else {g["SignaturePad"]=f()}}(typeof globalThis < "u" ? globalThis : typeof self < "u" ? self : this,function(){var exports={};var __exports=exports;var module={exports};
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __esm = (fn, res, err) => function __init() {
if (err) throw err[0];
try {
return fn && (res = (0, fn[__getOwnPropNames(fn)[0]])(fn = 0)), res;
} catch (e) {
throw err = [e], e;
}
};
var __export = (target, all) => {
for (var name in all)
__defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
if (from && typeof from === "object" || typeof from === "function") {
for (let key of __getOwnPropNames(from))
if (!__hasOwnProp.call(to, key) && key !== except)
__defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
}
return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
// src/point.ts
var Point;
var init_point = __esm({
"src/point.ts"() {
"use strict";
Point = class {
x;
y;
pressure;
time;
constructor(x, y, pressure, time) {
if (isNaN(x) || isNaN(y)) {
throw new Error(`Point is invalid: (${x}, ${y})`);
}
this.x = +x;
this.y = +y;
this.pressure = pressure || 0;
this.time = time || Date.now();
}
distanceTo(start) {
return Math.sqrt(
Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2)
);
}
equals(other) {
return this.x === other.x && this.y === other.y && this.pressure === other.pressure && this.time === other.time;
}
velocityFrom(start) {
return this.time !== start.time ? this.distanceTo(start) / (this.time - start.time) : 0;
}
};
}
});
// src/bezier.ts
var Bezier;
var init_bezier = __esm({
"src/bezier.ts"() {
"use strict";
init_point();
Bezier = class _Bezier {
constructor(startPoint, control2, control1, endPoint, startWidth, endWidth) {
this.startPoint = startPoint;
this.control2 = control2;
this.control1 = control1;
this.endPoint = endPoint;
this.startWidth = startWidth;
this.endWidth = endWidth;
}
startPoint;
control2;
control1;
endPoint;
startWidth;
endWidth;
static fromPoints(points, widths) {
const c2 = this.calculateControlPoints(points[0], points[1], points[2]).c2;
const c3 = this.calculateControlPoints(points[1], points[2], points[3]).c1;
return new _Bezier(points[1], c2, c3, points[2], widths.start, widths.end);
}
static calculateControlPoints(s1, s2, s3) {
const dx1 = s1.x - s2.x;
const dy1 = s1.y - s2.y;
const dx2 = s2.x - s3.x;
const dy2 = s2.y - s3.y;
const m1 = { x: (s1.x + s2.x) / 2, y: (s1.y + s2.y) / 2 };
const m2 = { x: (s2.x + s3.x) / 2, y: (s2.y + s3.y) / 2 };
const l1 = Math.sqrt(dx1 * dx1 + dy1 * dy1);
const l2 = Math.sqrt(dx2 * dx2 + dy2 * dy2);
const dxm = m1.x - m2.x;
const dym = m1.y - m2.y;
const k = l1 + l2 == 0 ? 0 : l2 / (l1 + l2);
const cm = { x: m2.x + dxm * k, y: m2.y + dym * k };
const tx = s2.x - cm.x;
const ty = s2.y - cm.y;
return {
c1: new Point(m1.x + tx, m1.y + ty),
c2: new Point(m2.x + tx, m2.y + ty)
};
}
// Returns approximated length. Code taken from https://www.lemoda.net/maths/bezier-length/index.html.
length() {
const steps = 10;
let length = 0;
let px;
let py;
for (let i = 0; i <= steps; i += 1) {
const t = i / steps;
const cx = this.point(
t,
this.startPoint.x,
this.control1.x,
this.control2.x,
this.endPoint.x
);
const cy = this.point(
t,
this.startPoint.y,
this.control1.y,
this.control2.y,
this.endPoint.y
);
if (i > 0) {
const xdiff = cx - px;
const ydiff = cy - py;
length += Math.sqrt(xdiff * xdiff + ydiff * ydiff);
}
px = cx;
py = cy;
}
return length;
}
// Calculate parametric value of x or y given t and the four point coordinates of a cubic bezier curve.
point(t, start, c1, c2, end) {
return start * (1 - t) * (1 - t) * (1 - t) + 3 * c1 * (1 - t) * (1 - t) * t + 3 * c2 * (1 - t) * t * t + end * t * t * t;
}
};
}
});
// src/signature_event_target.ts
var SignatureEventTarget;
var init_signature_event_target = __esm({
"src/signature_event_target.ts"() {
"use strict";
SignatureEventTarget = class {
/* tslint:disable: variable-name */
_et;
/* tslint:enable: variable-name */
constructor() {
try {
this._et = new EventTarget();
} catch {
this._et = document;
}
}
addEventListener(type, listener, options) {
this._et.addEventListener(type, listener, options);
}
dispatchEvent(event) {
return this._et.dispatchEvent(event);
}
removeEventListener(type, callback, options) {
this._et.removeEventListener(type, callback, options);
}
};
}
});
// src/throttle.ts
function throttle(fn, wait = 250) {
let previous = 0;
let timeout = null;
let result;
let storedContext;
let storedArgs;
const later = () => {
previous = Date.now();
timeout = null;
result = fn.apply(storedContext, storedArgs);
if (!timeout) {
storedContext = null;
storedArgs = [];
}
};
return function wrapper(...args) {
const now = Date.now();
const remaining = wait - (now - previous);
storedContext = this;
storedArgs = args;
if (remaining <= 0 || remaining > wait) {
if (timeout) {
clearTimeout(timeout);
timeout = null;
}
previous = now;
result = fn.apply(storedContext, storedArgs);
if (!timeout) {
storedContext = null;
storedArgs = [];
}
} else if (!timeout) {
timeout = window.setTimeout(later, remaining);
}
return result;
};
}
var init_throttle = __esm({
"src/throttle.ts"() {
"use strict";
}
});
// src/signature_pad.ts
var signature_pad_exports = {};
__export(signature_pad_exports, {
default: () => SignaturePad
});
var SignaturePad;
var init_signature_pad = __esm({
"src/signature_pad.ts"() {
"use strict";
init_bezier();
init_point();
init_signature_event_target();
init_throttle();
init_point();
SignaturePad = class _SignaturePad extends SignatureEventTarget {
/* tslint:enable: variable-name */
constructor(canvas, options = {}) {
super();
this.canvas = canvas;
this.velocityFilterWeight = options.velocityFilterWeight || 0.7;
this.minWidth = options.minWidth || 0.5;
this.maxWidth = options.maxWidth || 2.5;
this.throttle = options.throttle ?? 16;
this.minDistance = options.minDistance ?? 5;
this.dotSize = options.dotSize || 0;
this.penColor = options.penColor || "black";
this.backgroundColor = options.backgroundColor || "rgba(0,0,0,0)";
this.compositeOperation = options.compositeOperation || "source-over";
this.canvasContextOptions = options.canvasContextOptions ?? {};
this._strokeMoveUpdate = this.throttle ? throttle(_SignaturePad.prototype._strokeUpdate, this.throttle) : _SignaturePad.prototype._strokeUpdate;
this._handleMouseDown = this._handleMouseDown.bind(this);
this._handleMouseMove = this._handleMouseMove.bind(this);
this._handleMouseUp = this._handleMouseUp.bind(this);
this._handleTouchStart = this._handleTouchStart.bind(this);
this._handleTouchMove = this._handleTouchMove.bind(this);
this._handleTouchEnd = this._handleTouchEnd.bind(this);
this._handlePointerDown = this._handlePointerDown.bind(this);
this._handlePointerMove = this._handlePointerMove.bind(this);
this._handlePointerUp = this._handlePointerUp.bind(this);
this._handlePointerCancel = this._handlePointerCancel.bind(this);
this._handleTouchCancel = this._handleTouchCancel.bind(this);
this._ctx = canvas.getContext(
"2d",
this.canvasContextOptions
);
this.clear();
this.on();
}
canvas;
// Public stuff
dotSize;
minWidth;
maxWidth;
penColor;
minDistance;
velocityFilterWeight;
compositeOperation;
backgroundColor;
throttle;
canvasContextOptions;
// Private stuff
/* tslint:disable: variable-name */
_ctx;
_drawingStroke = false;
_isEmpty = true;
_dataUrl;
_dataUrlOptions;
_lastPoints = [];
// Stores up to 4 most recent points; used to generate a new curve
_data = [];
// Stores all points in groups (one group per line or dot)
_lastVelocity = 0;
_lastWidth = 0;
_strokeMoveUpdate;
_strokePointerId;
clear() {
const { _ctx: ctx, canvas } = this;
ctx.fillStyle = this.backgroundColor;
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillRect(0, 0, canvas.width, canvas.height);
this._data = [];
this._reset(this._getPointGroupOptions());
this._isEmpty = true;
this._dataUrl = void 0;
this._dataUrlOptions = void 0;
this._strokePointerId = void 0;
}
redraw() {
const data = this._data;
const dataUrl = this._dataUrl;
const dataUrlOptions = this._dataUrlOptions;
this.clear();
if (dataUrl) {
this.fromDataURL(dataUrl, dataUrlOptions);
}
this.fromData(data, { clear: false });
}
fromDataURL(dataUrl, options = {}) {
return new Promise((resolve, reject) => {
const image = new Image();
const ratio = options.ratio || window.devicePixelRatio || 1;
const width = options.width || this.canvas.width / ratio;
const height = options.height || this.canvas.height / ratio;
const xOffset = options.xOffset || 0;
const yOffset = options.yOffset || 0;
this._reset(this._getPointGroupOptions());
image.onload = () => {
this._ctx.drawImage(image, xOffset, yOffset, width, height);
resolve();
};
image.onerror = (error) => {
reject(error);
};
image.crossOrigin = "anonymous";
image.src = dataUrl;
this._isEmpty = false;
this._dataUrl = dataUrl;
this._dataUrlOptions = { ...options };
});
}
toDataURL(type = "image/png", encoderOptions) {
switch (type) {
case "image/svg+xml":
if (typeof encoderOptions !== "object") {
encoderOptions = void 0;
}
return `data:image/svg+xml;base64,${btoa(
this.toSVG(encoderOptions)
)}`;
default:
if (typeof encoderOptions !== "number") {
encoderOptions = void 0;
}
return this.canvas.toDataURL(type, encoderOptions);
}
}
on() {
this.canvas.style.touchAction = "none";
this.canvas.style.msTouchAction = "none";
this.canvas.style.userSelect = "none";
this.canvas.style.webkitUserSelect = "none";
const isIOS = /Macintosh/.test(navigator.userAgent) && "ontouchstart" in document;
if (window.PointerEvent && !isIOS) {
this._handlePointerEvents();
} else {
this._handleMouseEvents();
if ("ontouchstart" in window) {
this._handleTouchEvents();
}
}
}
off() {
this.canvas.style.touchAction = "auto";
this.canvas.style.msTouchAction = "auto";
this.canvas.style.userSelect = "auto";
this.canvas.style.webkitUserSelect = "auto";
this.canvas.removeEventListener("pointerdown", this._handlePointerDown);
this.canvas.removeEventListener("mousedown", this._handleMouseDown);
this.canvas.removeEventListener("touchstart", this._handleTouchStart);
this._removeMoveUpEventListeners();
}
_getListenerFunctions() {
const canvasWindow = window.document === this.canvas.ownerDocument ? window : this.canvas.ownerDocument.defaultView ?? this.canvas.ownerDocument;
return {
addEventListener: canvasWindow.addEventListener.bind(
canvasWindow
),
removeEventListener: canvasWindow.removeEventListener.bind(
canvasWindow
)
};
}
_removeMoveUpEventListeners() {
const { removeEventListener } = this._getListenerFunctions();
removeEventListener("pointermove", this._handlePointerMove);
removeEventListener("pointerup", this._handlePointerUp);
removeEventListener("pointercancel", this._handlePointerCancel);
removeEventListener("mousemove", this._handleMouseMove);
removeEventListener("mouseup", this._handleMouseUp);
removeEventListener("touchmove", this._handleTouchMove);
removeEventListener("touchend", this._handleTouchEnd);
removeEventListener("touchcancel", this._handleTouchCancel);
}
isEmpty() {
return this._isEmpty;
}
fromData(pointGroups, { clear = true } = {}) {
if (clear) {
this.clear();
}
this._fromData(
pointGroups,
this._drawCurve.bind(this),
this._drawDot.bind(this),
this._drawLine.bind(this)
);
this._data = this._data.concat(pointGroups);
}
toData() {
return this._data;
}
_isLeftButtonPressed(event, only) {
if (only) {
return event.buttons === 1;
}
return (event.buttons & 1) === 1;
}
_pointerEventToSignatureEvent(event) {
return {
event,
type: event.type,
x: event.clientX,
y: event.clientY,
pressure: "pressure" in event ? event.pressure : 0
};
}
_touchEventToSignatureEvent(event) {
const touch = event.changedTouches[0];
return {
event,
type: event.type,
x: touch.clientX,
y: touch.clientY,
pressure: touch.force
};
}
// Event handlers
_handleMouseDown(event) {
if (!this._isLeftButtonPressed(event, true) || this._drawingStroke) {
return;
}
this._strokeBegin(this._pointerEventToSignatureEvent(event));
}
_handleMouseMove(event) {
if (!this._isLeftButtonPressed(event, true) || !this._drawingStroke) {
this._strokeEnd(this._pointerEventToSignatureEvent(event), false);
return;
}
this._strokeMoveUpdate(this._pointerEventToSignatureEvent(event));
}
_handleMouseUp(event) {
if (this._isLeftButtonPressed(event)) {
return;
}
this._strokeEnd(this._pointerEventToSignatureEvent(event));
}
_handleTouchStart(event) {
if (event.targetTouches.length !== 1 || this._drawingStroke) {
return;
}
if (event.cancelable) {
event.preventDefault();
}
this._strokeBegin(this._touchEventToSignatureEvent(event));
}
_handleTouchMove(event) {
if (event.targetTouches.length !== 1) {
return;
}
if (event.cancelable) {
event.preventDefault();
}
if (!this._drawingStroke) {
this._strokeEnd(this._touchEventToSignatureEvent(event), false);
return;
}
this._strokeMoveUpdate(this._touchEventToSignatureEvent(event));
}
_handleTouchEnd(event) {
if (event.targetTouches.length !== 0) {
return;
}
if (event.cancelable) {
event.preventDefault();
}
this._strokeEnd(this._touchEventToSignatureEvent(event));
}
_handlePointerCancel(event) {
if (!this._allowPointerId(event)) {
return;
}
event.preventDefault();
this._strokeEnd(this._pointerEventToSignatureEvent(event), false);
}
_handleTouchCancel(event) {
if (event.cancelable) {
event.preventDefault();
}
this._strokeEnd(this._touchEventToSignatureEvent(event), false);
}
_getPointerId(event) {
return event.persistentDeviceId || event.pointerId;
}
_allowPointerId(event, allowUndefined = false) {
if (typeof this._strokePointerId === "undefined") {
return allowUndefined;
}
return this._getPointerId(event) === this._strokePointerId;
}
_handlePointerDown(event) {
if (this._drawingStroke || !this._isLeftButtonPressed(event) || !this._allowPointerId(event, true)) {
return;
}
this._strokePointerId = this._getPointerId(event);
event.preventDefault();
this._strokeBegin(this._pointerEventToSignatureEvent(event));
}
_handlePointerMove(event) {
if (!this._allowPointerId(event)) {
return;
}
if (!this._isLeftButtonPressed(event, true) || !this._drawingStroke) {
this._strokeEnd(this._pointerEventToSignatureEvent(event), false);
return;
}
event.preventDefault();
this._strokeMoveUpdate(this._pointerEventToSignatureEvent(event));
}
_handlePointerUp(event) {
if (this._isLeftButtonPressed(event) || !this._allowPointerId(event)) {
return;
}
event.preventDefault();
this._strokeEnd(this._pointerEventToSignatureEvent(event));
}
_getPointGroupOptions(group) {
return {
penColor: group && "penColor" in group ? group.penColor : this.penColor,
dotSize: group && "dotSize" in group ? group.dotSize : this.dotSize,
minWidth: group && "minWidth" in group ? group.minWidth : this.minWidth,
maxWidth: group && "maxWidth" in group ? group.maxWidth : this.maxWidth,
velocityFilterWeight: group && "velocityFilterWeight" in group ? group.velocityFilterWeight : this.velocityFilterWeight,
compositeOperation: group && "compositeOperation" in group ? group.compositeOperation : this.compositeOperation
};
}
// Private methods
_strokeBegin(event) {
const cancelled = !this.dispatchEvent(
new CustomEvent("beginStroke", { detail: event, cancelable: true })
);
if (cancelled) {
return;
}
const { addEventListener } = this._getListenerFunctions();
switch (event.event.type) {
case "mousedown":
addEventListener("mousemove", this._handleMouseMove, {
passive: false
});
addEventListener("mouseup", this._handleMouseUp, { passive: false });
break;
case "touchstart":
addEventListener("touchmove", this._handleTouchMove, {
passive: false
});
addEventListener("touchend", this._handleTouchEnd, { passive: false });
addEventListener("touchcancel", this._handleTouchCancel, {
passive: false
});
break;
case "pointerdown":
addEventListener("pointermove", this._handlePointerMove, {
passive: false
});
addEventListener("pointerup", this._handlePointerUp, {
passive: false
});
addEventListener("pointercancel", this._handlePointerCancel, {
passive: false
});
break;
default:
}
this._drawingStroke = true;
const pointGroupOptions = this._getPointGroupOptions();
const newPointGroup = {
...pointGroupOptions,
points: []
};
this._data.push(newPointGroup);
this._reset(pointGroupOptions);
this._strokeUpdate(event);
}
_strokeUpdate(event) {
if (!this._drawingStroke) {
return;
}
if (this._data.length === 0) {
this._strokeBegin(event);
return;
}
this.dispatchEvent(
new CustomEvent("beforeUpdateStroke", { detail: event })
);
const point = this._createPoint(event.x, event.y, event.pressure);
const lastPointGroup = this._data[this._data.length - 1];
const lastPoints = lastPointGroup.points;
const lastPoint = lastPoints.length > 0 && lastPoints[lastPoints.length - 1];
const isLastPointTooClose = lastPoint ? point.distanceTo(lastPoint) <= this.minDistance : false;
const pointGroupOptions = this._getPointGroupOptions(lastPointGroup);
if (!lastPoint || !(lastPoint && isLastPointTooClose)) {
const curve = this._addPoint(point, pointGroupOptions);
if (!lastPoint) {
this._drawDot(point, pointGroupOptions);
} else if (curve) {
this._drawCurve(curve, pointGroupOptions);
}
lastPoints.push({
time: point.time,
x: point.x,
y: point.y,
pressure: point.pressure
});
}
this.dispatchEvent(new CustomEvent("afterUpdateStroke", { detail: event }));
}
_strokeEnd(event, shouldUpdate = true) {
this._removeMoveUpEventListeners();
if (!this._drawingStroke) {
return;
}
if (shouldUpdate) {
this._strokeUpdate(event);
}
this._drawingStroke = false;
this._strokePointerId = void 0;
this.dispatchEvent(new CustomEvent("endStroke", { detail: event }));
}
_handlePointerEvents() {
this._drawingStroke = false;
this.canvas.addEventListener("pointerdown", this._handlePointerDown, {
passive: false
});
}
_handleMouseEvents() {
this._drawingStroke = false;
this.canvas.addEventListener("mousedown", this._handleMouseDown, {
passive: false
});
}
_handleTouchEvents() {
this.canvas.addEventListener("touchstart", this._handleTouchStart, {
passive: false
});
}
// Called when a new line is started
_reset(options) {
this._lastPoints = [];
this._lastVelocity = 0;
this._lastWidth = (options.minWidth + options.maxWidth) / 2;
this._ctx.fillStyle = options.penColor;
this._ctx.globalCompositeOperation = options.compositeOperation;
}
_createPoint(x, y, pressure) {
const rect = this.canvas.getBoundingClientRect();
return new Point(
x - rect.left,
y - rect.top,
pressure,
(/* @__PURE__ */ new Date()).getTime()
);
}
// Add point to _lastPoints array and generate a new curve if there are enough points (i.e. 3)
_addPoint(point, options) {
const { _lastPoints } = this;
_lastPoints.push(point);
if (_lastPoints.length > 2) {
if (_lastPoints.length === 3) {
_lastPoints.unshift(_lastPoints[0]);
}
const widths = this._calculateCurveWidths(
_lastPoints[1],
_lastPoints[2],
options
);
const curve = Bezier.fromPoints(_lastPoints, widths);
_lastPoints.shift();
return curve;
}
return null;
}
_calculateCurveWidths(startPoint, endPoint, options) {
const velocity = options.velocityFilterWeight * endPoint.velocityFrom(startPoint) + (1 - options.velocityFilterWeight) * this._lastVelocity;
const newWidth = this._strokeWidth(velocity, options);
const widths = {
end: newWidth,
start: this._lastWidth
};
this._lastVelocity = velocity;
this._lastWidth = newWidth;
return widths;
}
_strokeWidth(velocity, options) {
return Math.max(options.maxWidth / (velocity + 1), options.minWidth);
}
_drawCurveSegment(x, y, width) {
const ctx = this._ctx;
ctx.moveTo(x, y);
ctx.arc(x, y, width, 0, 2 * Math.PI, false);
this._isEmpty = false;
}
_drawCurve(curve, options) {
const ctx = this._ctx;
const widthDelta = curve.endWidth - curve.startWidth;
const drawSteps = Math.ceil(curve.length()) * 2;
ctx.beginPath();
ctx.fillStyle = options.penColor;
for (let i = 0; i < drawSteps; i += 1) {
const t = i / drawSteps;
const tt = t * t;
const ttt = tt * t;
const u = 1 - t;
const uu = u * u;
const uuu = uu * u;
let x = uuu * curve.startPoint.x;
x += 3 * uu * t * curve.control1.x;
x += 3 * u * tt * curve.control2.x;
x += ttt * curve.endPoint.x;
let y = uuu * curve.startPoint.y;
y += 3 * uu * t * curve.control1.y;
y += 3 * u * tt * curve.control2.y;
y += ttt * curve.endPoint.y;
const width = Math.min(
curve.startWidth + ttt * widthDelta,
options.maxWidth
);
this._drawCurveSegment(x, y, width);
}
ctx.closePath();
ctx.fill();
}
_getDotSize(options) {
return options.dotSize > 0 ? options.dotSize : (options.minWidth + options.maxWidth) / 2;
}
_drawDot(point, options) {
const ctx = this._ctx;
const width = this._getDotSize(options);
ctx.beginPath();
this._drawCurveSegment(point.x, point.y, width);
ctx.closePath();
ctx.fillStyle = options.penColor;
ctx.fill();
}
_drawLine(startPoint, endPoint, options) {
const ctx = this._ctx;
ctx.save();
ctx.beginPath();
ctx.moveTo(startPoint.x, startPoint.y);
ctx.lineTo(endPoint.x, endPoint.y);
ctx.lineWidth = this._getDotSize(options) * 2;
ctx.lineCap = "round";
ctx.strokeStyle = options.penColor;
ctx.stroke();
ctx.restore();
this._isEmpty = false;
}
_fromData(pointGroups, drawCurve, drawDot, drawLine) {
for (const group of pointGroups) {
const { points } = group;
const pointGroupOptions = this._getPointGroupOptions(group);
if (points.length > 2) {
for (let j = 0; j < points.length; j += 1) {
const basicPoint = points[j];
const point = new Point(
basicPoint.x,
basicPoint.y,
basicPoint.pressure,
basicPoint.time
);
if (j === 0) {
this._reset(pointGroupOptions);
}
const curve = this._addPoint(point, pointGroupOptions);
if (curve) {
drawCurve(curve, pointGroupOptions);
}
}
} else if (points.length === 2) {
this._reset(pointGroupOptions);
drawLine(points[0], points[1], pointGroupOptions);
} else {
this._reset(pointGroupOptions);
drawDot(points[0], pointGroupOptions);
}
}
}
toSVG({
includeBackgroundColor = false,
includeDataUrl = false
} = {}) {
const pointGroups = this._data;
const ratio = Math.max(window.devicePixelRatio || 1, 1);
const minX = 0;
const minY = 0;
const maxX = this.canvas.width / ratio;
const maxY = this.canvas.height / ratio;
const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
svg.setAttribute("xmlns", "http://www.w3.org/2000/svg");
svg.setAttribute("xmlns:xlink", "http://www.w3.org/1999/xlink");
svg.setAttribute("viewBox", `${minX} ${minY} ${maxX} ${maxY}`);
svg.setAttribute("width", maxX.toString());
svg.setAttribute("height", maxY.toString());
if (includeBackgroundColor && this.backgroundColor) {
const rect = document.createElement("rect");
rect.setAttribute("width", "100%");
rect.setAttribute("height", "100%");
rect.setAttribute("fill", this.backgroundColor);
svg.appendChild(rect);
}
if (includeDataUrl && this._dataUrl) {
const ratio2 = this._dataUrlOptions?.ratio || window.devicePixelRatio || 1;
const width = this._dataUrlOptions?.width || this.canvas.width / ratio2;
const height = this._dataUrlOptions?.height || this.canvas.height / ratio2;
const xOffset = this._dataUrlOptions?.xOffset || 0;
const yOffset = this._dataUrlOptions?.yOffset || 0;
const image = document.createElement("image");
image.setAttribute("x", xOffset.toString());
image.setAttribute("y", yOffset.toString());
image.setAttribute("width", width.toString());
image.setAttribute("height", height.toString());
image.setAttribute("preserveAspectRatio", "none");
image.setAttribute("href", this._dataUrl);
svg.appendChild(image);
}
this._fromData(
pointGroups,
(curve, { penColor }) => {
const path = document.createElement("path");
if (!isNaN(curve.control1.x) && !isNaN(curve.control1.y) && !isNaN(curve.control2.x) && !isNaN(curve.control2.y)) {
const attr = `M ${curve.startPoint.x.toFixed(3)},${curve.startPoint.y.toFixed(
3
)} C ${curve.control1.x.toFixed(3)},${curve.control1.y.toFixed(3)} ${curve.control2.x.toFixed(3)},${curve.control2.y.toFixed(3)} ${curve.endPoint.x.toFixed(3)},${curve.endPoint.y.toFixed(3)}`;
path.setAttribute("d", attr);
path.setAttribute("stroke-width", (curve.endWidth * 2.25).toFixed(3));
path.setAttribute("stroke", penColor);
path.setAttribute("fill", "none");
path.setAttribute("stroke-linecap", "round");
svg.appendChild(path);
}
},
(point, { penColor, dotSize, minWidth, maxWidth }) => {
const circle = document.createElement("circle");
const size = dotSize > 0 ? dotSize : (minWidth + maxWidth) / 2;
circle.setAttribute("r", size.toString());
circle.setAttribute("cx", point.x.toString());
circle.setAttribute("cy", point.y.toString());
circle.setAttribute("fill", penColor);
svg.appendChild(circle);
},
(startPoint, endPoint, options) => {
const line = document.createElement("line");
line.setAttribute("x1", startPoint.x.toString());
line.setAttribute("y1", startPoint.y.toString());
line.setAttribute("x2", endPoint.x.toString());
line.setAttribute("y2", endPoint.y.toString());
line.setAttribute("stroke", options.penColor);
line.setAttribute(
"stroke-width",
(this._getDotSize(options) * 2).toString()
);
line.setAttribute("stroke-linecap", "round");
svg.appendChild(line);
}
);
return svg.outerHTML;
}
};
}
});
// <stdin>
module.exports = (init_signature_pad(), __toCommonJS(signature_pad_exports)).default;
if(__exports != exports)module.exports = exports;return module.exports}));
//# sourceMappingURL=signature_pad.umd.js.map