freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/make-motion-more-natural-using-a-bezier-curve.md

id, title, challengeType, videoUrl, forumTopicId, dashedName

id	title	challengeType	videoUrl	forumTopicId	dashedName
587d78a9367417b2b2512aea	Make Motion More Natural Using a Bezier Curve	0	https://scrimba.com/c/c7akWUv	301063	make-motion-more-natural-using-a-bezier-curve

--description--

This challenge animates an element to replicate the movement of a ball being juggled. Prior challenges covered the linear and ease-out cubic Bezier curves, however neither depicts the juggling movement accurately. You need to customize a Bezier curve for this.

The animation-timing-function automatically loops at every keyframe when the animation-iteration-count is set to infinite. Since there is a keyframe rule set in the middle of the animation duration (at 50%), it results in two identical animation progressions at the upward and downward movement of the ball.

The following cubic Bezier curve simulates a juggling movement:

cubic-bezier(0.3, 0.4, 0.5, 1.6);

Notice that the value of y2 is larger than 1. Although the cubic Bezier curve is mapped on a 1 by 1 coordinate system, and it can only accept x values from 0 to 1, the y value can be set to numbers larger than one. This results in a bouncing movement that is ideal for simulating the juggling ball.

--instructions--

Change value of the animation-timing-function of the element with the id of green to a cubic-bezier function with x1, y1, x2, y2 values set respectively to 0.311, 0.441, 0.444, 1.649.

--hints--

The value of the animation-timing-function property for the element with the id green should be a cubic-bezier function with x1, y1, x2, y2 values as specified.

assert(
  $('#green').css('animation-timing-function') ==
    'cubic-bezier(0.311, 0.441, 0.444, 1.649)'
);

--seed--

--seed-contents--

<style>
  .balls {
    border-radius: 50%;
    position: fixed;
    width: 50px;
    height: 50px;
    top: 60%;
    animation-name: jump;
    animation-duration: 2s;
    animation-iteration-count: infinite;
  }
  #red {
    background: red;
    left: 25%;
    animation-timing-function: linear;
  }
  #blue {
    background: blue;
    left: 50%;
    animation-timing-function: ease-out;
  }
  #green {
    background: green;
    left: 75%;
    animation-timing-function: cubic-bezier(0.69, 0.1, 1, 0.1);
  }

  @keyframes jump {
    50% {
      top: 10%;
    }
  }
</style>
<div class="balls" id="red"></div>
<div class="balls" id="blue"></div>
<div class="balls" id="green"></div>

--solutions--

<style>
  .balls {
    border-radius: 50%;
    position: fixed;
    width: 50px;
    height: 50px;
    top: 60%;
    animation-name: jump;
    animation-duration: 2s;
    animation-iteration-count: infinite;
  }
  #red {
    background: red;
    left: 25%;
    animation-timing-function: linear;
  }
  #blue {
    background: blue;
    left: 50%;
    animation-timing-function: ease-out;
  }
  #green {
    background: green;
    left: 75%;
    animation-timing-function: cubic-bezier(0.311, 0.441, 0.444, 1.649);
  }

  @keyframes jump {
    50% {
      top: 10%;
    }
  }
</style>
<div class="balls" id="red"></div>
<div class="balls" id="blue"></div>
<div class="balls" id="green"></div>