Line

0%

html

<div class="sc__wrapper">
    <!-- scratchcard -->
    <div id="js--sc--container" class="sc__container">
        <!-- background image insert here by scratchcard-js -->
        <!-- canvas generate here -->
    </div>
    <!-- infos -->
    <div class="sc__infos">
        <!-- percent -->
    </div>
</div>

css

.sc__inner {
   position: relative;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
}
.sc__wrapper {
   display: block;
   width: 100%;
   height: 300px;
   max-width: 300px;
   margin: 0 auto;
   border: 5px solid white;
}

.sc__container {
   position: relative;
   overflow: hidden;
   height: 300px;
   max-width: 300px;
}

.sc__container > img {
   position: relative;
   top: 0;
   left: 0;
   width: 100%;
   height: auto;
}

.sc__container canvas {
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: auto;
}

.sc__infos {
   text-align: center;
   height: 40px;
   line-height: 40px;
   margin-top: 5px;
   font-weight: bold;
   font-size: 18px;
}

Javascript

const scContainer = document.getElementById('js--sc--container')
const scInfos = document.querySelector('.sc__infos');
const sc = new ScratchCard('#js--sc--container', {
  scratchType: SCRATCH_TYPE.LINE,
  containerWidth: scContainer.offsetWidth,
  containerHeight: 300,
  imageForwardSrc: '/images/scratchcard.jpg',
  imageBackgroundSrc: '/images/result.png',
  htmlBackground: '',
  clearZoneRadius: 20,
  nPoints: 0,
  pointSize: 0,
  callback: function () {
    alert('Now the window will reload !')
    window.location.reload()
  }
})

// Init
sc.init().then(() => {
  sc.canvas.addEventListener('scratch.move', () => {
    let percent = sc.getPercent().toFixed(0);
    scInfos.innerHTML = percent + '%';
    console.log(percent)
  })
}).catch((error) => {
  // image not loaded
  alert(error.message);
});