2.9 KiB
2.9 KiB
id | title | challengeType | videoUrl |
---|---|---|---|
587d78a9367417b2b2512aea | Make Motion More Natural Using a Bezier Curve | 0 | https://scrimba.com/c/c7akWUv |
Description
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 an 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
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.
Tests
tests:
- text: The value of the <code>animation-timing-function</code> property for the element with the id <code>green</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values as specified.
testString: assert($('#green').css('animation-timing-function') == 'cubic-bezier(0.311, 0.441, 0.444, 1.649)', 'The value of the <code>animation-timing-function</code> property for the element with the id <code>green</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values as specified.');
Challenge Seed
<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>
Solution
// solution required