ctx.save()
ctx.beginPath()
ctx.setFillStyle('#fff')
sketchUp.drawCircle(10.533 * vw, res[6])
ctx.setShadow(0, 0.5 * vw, 10, 'rgba(55,75,99,0.15)')
ctx.fill()
ctx.restore()

ctx.save()
ctx.beginPath()
sketchUp.drawCircle(10 * vw, res[6])
ctx.clip()
sketchUp.drawImg(this.avatarUrl, res[6])
ctx.restore()
ctx.draw(true)

_canvasDraw () {
  const ctx = this.sketchUp.ctx
  wechat.draw(ctx).then(res => {
    this._canvasToFile(ctx)
  }).catch(err => {
    console.info(err)
    wechat.hideLoading()
    this.$refs.toast.show('绘图失败，请重新尝试！')
  })
},
_canvasToFile (ctx) {
  wechat.canvasToTempFilePath({
    x: 0,
    y: 0,
    width: this.divW * this.prop,
    height: this.divH * this.prop,
    destWidth: this.divW * this.prop,
    destHeight: this.divH * this.prop,
    canvasId: 'poster',
    fileType: 'jpg'
  }, ctx).then(res => {
    wechat.hideLoading()
    // wechat.previewImage({urls: [res.tempFilePath]})
    this._upLoadImg(res.tempFilePath)
    const path = `/pages/poster-share/poster-share`
    getApp().globalData.imgUrl = res.tempFilePath
    this.$router.push({path})
    // console.info(res.tempFilePath)
  }).catch(err => {
    console.info(err)
    wechat.hideLoading()
    this.$refs.toast.show('请重新尝试！')
  })

/**
 * 绘制圆形
 * @param r 半径
 * @param res 盒子的信息
 * @param xAdjust 可调整的偏移量x轴
 * @param yAdjust 可调整的偏移量y轴
 * @private
 */
drawCircle (r, res, xAdjust = 0, yAdjust = 0) {
  this.ctx.arc((res.left + this.rPos.left + res.width / 2 + xAdjust) * this.prop, (res.top + this.rPos.top + res.width / 2 + yAdjust) * this.prop, r, 2 * Math.PI)
}

/**
 * 绘制图片
 * @param imgUrl  图片路径
 * @param res 盒子信息
 * @param xAdjust 可调整的偏移量x轴
 * @param yAdjust 可调整的偏移量y轴
 * @private