jianghh-canvas/lib/utils/Erase.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 i={buffer:!0,pointerdown({offsetX:t,offsetY:s}){const e=this.eraseSize/2;this.points.push({x:t,y:s}),this.bufferCtx.lineWidth=1,this.bufferCtx.moveTo(t-e,s-e),this.bufferCtx.beginPath(),this.bufferCtx.rect(t-e,s-e,this.eraseSize,this.eraseSize),this.bufferCtx.stroke()},pointermove({offsetX:t,offsetY:s}){const e=this.eraseSize/2;this.ctx.clearRect(t-e,s-e,this.eraseSize,this.eraseSize),this.bufferCtx.clearRect(0,0,this.el.width,this.el.height),this.bufferCtx.moveTo(t-e,s-e),this.bufferCtx.beginPath(),this.bufferCtx.rect(t-e,s-e,this.eraseSize,this.eraseSize),this.bufferCtx.stroke()},pointerup(){this.bufferCtx.clearRect(0,0,this.el.width,this.el.height)}};exports.Erase=i;