Making div animate and appear rotating clockwise.i.e radialwipe clock effect for Div

Question

I have been googling for a appear effect of div like here.
Here image is drawn using < canvas >
"radialwipe clock effect "
How can I achieve this.
I found this javascript library. But it provides this effect for image only.
I need the same effect for div.
What are the approaches to do the same.
Thanks in advance.

Answer 1

I created an 1/2 clock animation effect which is similar to the one you want. I hope to find the solution to provide an exact animation.

Code

You need some markup for the animation:

<div class="wrapper">
  <div class="content">
    This is a good day. Maybe.
  </div>
  <div class="rotate"></div>
  <div class="mask"></div>
</div>

• wrapper - is used to set the position of the content
• content - your content in a div (or any other element)
• rotate - animation to simulate the 1/2 clock
• mask - animation to hide the content

And this is the CSS (written in SCSS):

Variables

$width: 200px;
$height: 200px;
$duration: 2s;
$delay: 1s;
$color-alpha: #308991;
$color-beta: #80c144;
$color-gamma: #b83d54;

.wrapper {
  position:relative;
  width: $width;
  height: $height;
  margin:0 auto;
}

.content {
  width: $width;
  height: $height;
  background: $color-beta;
  border-radius: 50%;
  padding: 2em;
  overflow: hidden;
  text-align:center;
}

/* Rotates 360 deg */
.rotate {
  position: absolute; 
  z-index: 2;
  top: 0;
  right: 0;
  width: $width / 2;
  height: $height;
  box-shadow:0 0 0 .15em $color-alpha;
  background: $color-alpha;
  transform-origin: 0 50%;
  animation: rotate $duration linear 1 forwards;
  animation-delay: 1s;
}

@keyframes rotate {
  0%   { 
    transform: rotate(0deg);
  }
  62% {
    opacity:1;
  }
  99.99% {
    z-index: 2;
  }
  100% { 
    transform: rotate(360deg);
    opacity: 0;
    z-index: -1;
  }
}

/* The .content is hidden by .mask until the .rotate reveals it */
.mask {
  position:absolute;
  z-index:1;
  top: -1px;
  left: -1px;
  width: $width + 2px;
  height: $height + 2px;
  background: 
    linear-gradient(top, transparent 50%, $color-alpha 50%),
    linear-gradient(top, $color-alpha 50%, transparent 50%);
  background: 
    linear-gradient(to top, transparent 50%, $color-alpha 50%),
    linear-gradient(to top, $color-alpha 50%, transparent 50%);
  background-position:100% 100%, 0 0;
  background-size: 50% 200%;
  background-repeat: no-repeat;
  border-radius: 50%;
  box-shadow:0 0 0 .65em $color-alpha;

  animation: mask $duration / 1.25 linear 1 forwards; 
  animation-delay: (-$duration / 7.5) + $delay;
}

@keyframes mask {
  50% {
    background-position: 100% 0, 0 0;
  }

  99.99% {
    z-index: 1;
  }

  100% {
    background-position: 100% 0, 0 100%;
    z-index: -1;
  }
}

Demo

You can see an live demo on CodePen: 1/2 clock animation