CSS animations
CSS Animations can be used on both HTML elements and SVG drawing elements embedded in a HTML page.
CSS animation parts
A CSS animation is made with resource to 2 parts
animation properties
specify what CSS element will be animated, and how (animation name, how fast, how many times)
- animation-name: name-of-animation (to be used in @keyframes)
- animation-duration: in seconds
- animation-delay: in seconds
- animation-timing-function: linear, ease, steps(5) More on animation-timing-function
- animation-iteration-count: number, infinite
- animation-direction: normal, reverse, alternate, alternate-reverse;
- animation-play-state: playing, paused;
@keyframes
specifiy what happens at each stage of the animation.
- using percentages of time
- from, to positions
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
h1 {
animation-name: textanim;
animation-duration: 5s;
animation-timing-function: steps(10);
animation-iteration-count: infinite;
animation-direction:alternate-reverse;
transform-origin: center bottom ;
}
@keyframes textanim {
0% { color:black;
transform: translate(0px,0px);
}
50%{ color:red;
transform: translate(150px,50px);
}
100%{ color:black;
transform: translate(300px,0px);
}
}
</style>
</head>
<body>
<h1>Animate this!</h1>
</body>
</html>
animation tricks
animation-play-state
You can set the animation to play or pause when you hover/click in the element animation-play-state: playing; animation-play-state: paused;
animation-delay
animation-delay sets when an animation starts.
It can start when
- page is loaded:
0s - N seconds after the page is loaded:
positive number of seconds - N seconds before the page is loaded, meaning that it will already be halfway through it:
negative number of seconds
https://codepen.io/PublicationStation/pen/BGRPry
animation: transform-origin
figuring out what is the center point of an element, so that we can rotate/skew/scale it, from it center point, can be a bit tricky. A simple solution is to
- add in the vector drawing a circle to the center of the element
- in the SVG code see the
cxandcy - those points will be the center of the element
- than we can simply delete the circle for our svg code.
https://codepen.io/PublicationStation/pen/MzmPEg
animation-timing-function
Links
- jumping to another state mid animation
https://css-tricks.com/css-animation-tricks/#article-header-id-0
- transform-origin
https://css-tricks.com/transforms-on-svg-elements/
For SVG elements, the origin is at the 0 0 point of the SVG canvas, assuming we have no transform applied on the element itself or any of its parents inside the <svg> element
