Oliver Eyton-Williams ee1e8abd87

feat(curriculum): restore seed + solution to Chinese (#40683 )

* feat(tools): add seed/solution restore script

* chore(curriculum): remove empty sections' markers

* chore(curriculum): add seed + solution to Chinese

* chore: remove old formatter

* fix: update getChallenges

parse translated challenges separately, without reference to the source

* chore(curriculum): add dashedName to English

* chore(curriculum): add dashedName to Chinese

* refactor: remove unused challenge property 'name'

* fix: relax dashedName requirement

* fix: stray tag

Remove stray `pre` tag from challenge file.

Signed-off-by: nhcarrigan <nhcarrigan@gmail.com>

Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>

2021-01-12 19:31:00 -07:00

3.0 KiB

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id, title, challengeType, videoUrl, forumTopicId, dashedName

id	title	challengeType	videoUrl	forumTopicId	dashedName
587d78a9367417b2b2512aea	使用贝塞尔曲线让运动更加自然	0	https://scrimba.com/c/c7akWUv	301063	make-motion-more-natural-using-a-bezier-curve

--description--

在这个挑战中，我们需要给元素添加动画来模拟杂耍中被抛接的球。之前的挑战中，我们学习了 linear 和 ease-out 的贝塞尔曲线描述，但这两个都无法完美地描述杂耍球的运动。在本关里你需要定制贝塞尔曲线。

当 animation-iteration-count 值为 infinite 时，animation-timing-function 会自动循环 keyframe。由于我们是在动画周期的中间点（50% 处）设置的 keyframe 规则，最终的结果是球向上和球向下是两个同样的动画过程。

下面的例子模拟了杂耍球运动：

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

注意 y2 的值是大于 1 的。虽然贝塞尔曲线是在 1 * 1 的坐标系统内 x 值只能取 0 到 1，但是 y 值是可以大于 1 的。这样我们才能模拟杂耍球运动。

--instructions--

把 id 为 green 的元素的 animation-timing-function 值改成 cubic-bezier 函数，函数的参数 x1、y1、x2、y2 值依次为 0.311、0.441、0.444、1.649。

--hints--

id 为 green 的元素的 animation-timing-function 属性值应为 cubic-bezier 函数，函数的参数 x1、y1、x2、y2 的值依次为 0.311、0.441、0.444、1.649。

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>

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