@tomiaa/canvas-graffiti/es/utils/Arc.js

canvas 涂鸦画板，支持笔写、手写、鼠标绘图

const e = {
  buffer: !0,
  pointerdown({ offsetX: t, offsetY: i }) {
    this.bufferCtx.moveTo(t, i);
  },
  pointermove({ offsetX: t, offsetY: i }) {
    this.bufferCtx.clearRect(0, 0, this.el.width, this.el.height), this.bufferCtx.beginPath(), this.bufferCtx.arc(
      this.beginPoint.x,
      this.beginPoint.y,
      Math.abs(t - this.beginPoint.x),
      0,
      2 * Math.PI
    ), this.endPoint = { x: t, y: i }, this.bufferCtx.stroke();
  },
  pointerup() {
    this.endPoint && (this.ctx.beginPath(), this.ctx.arc(
      this.beginPoint.x,
      this.beginPoint.y,
      Math.abs(this.endPoint.x - this.beginPoint.x),
      0,
      2 * Math.PI
    ), this.ctx.stroke());
  }
};
export {
  e as Arc
};