jianghh-canvas/lib/utils/Marker.js

canvas画板，支持笔写、手写、鼠标流畅绘图，自动保存，撤销重做

"use strict";Object.defineProperty(exports,Symbol.toStringTag,{value:"Module"});const e={pointerdown({offsetX:i,offsetY:s}){this.points.push({x:i>>0,y:s>>0}),this.ctx.beginPath(),this.ctx.arc(this.beginPoint.x,this.beginPoint.y,this.lineWidth/2,0,2*Math.PI),this.ctx.fill(),this.ctx.closePath()},pointermove({offsetX:i,offsetY:s}){if(this.points.push({x:i>>0,y:s>>0}),this.points.length<3)return;const t=this.points.slice(-2),o=t[0],n={x:(t[0].x+t[1].x)/2,y:(t[0].y+t[1].y)/2};this.ctx.beginPath(),this.ctx.moveTo(this.beginPoint.x,this.beginPoint.y),this.ctx.quadraticCurveTo(o.x,o.y,n.x,n.y),this.ctx.stroke(),this.beginPoint=n},pointerup(){this.ctx.beginPath(),this.ctx.arc(this.beginPoint.x,this.beginPoint.y,this.lineWidth/2,0,2*Math.PI),this.ctx.fill()}};exports.Marker=e;