jianghh-canvas/es/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

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);
  }
};
export {
  i as Erase
};