// uni-app

<camera

  v-if="cameraCtx !== null"

  :style='{top: cameraTop, right: cameraRight}'

  class="capture-face"

  device-position='front'

  flash='off'

  @error='binderror'

  @initdone='bindinitdone'

  @touchmove='cameraTouchMove'

/>

methods: {

        cameraTouchMove(e) {

            const { clientX, clientY } = e.touches[0]

            console.log('cameraTouchMove', clientX, clientY)

            if (clientX >= 0.85 * windowWidth) {

                this.cameraRight = 0

            } else if (clientX <= 0.15 * windowWidth) {

                this.cameraRight = '85vw'

            } else {

                this.cameraRight = Math.floor(((windowWidth - clientX) / windowWidth) * 100) + 'vw'

            }

            if (clientY >= 0.85 * windowHeight) {

                this.cameraTop = '85vh'

            } else if (clientY <= 0.15 * windowHeight) {

                this.cameraTop = 0

            } else {

                this.cameraTop = Math.floor((clientY / windowHeight) * 100) + 'vh'

            }

            console.log(this.cameraTop, this.cameraRight)

        },

}