postcss-random-keyframe

PostCSS plugin for making random animation. It provides a random function and generates keyframes repeatedly:

/* Input example */
@keyframes a {
  iteration-count:5; /* add this property to iterate */
  from { transform: translate(random()px,random(-0.2,10)px) }
  to { transform: translate(random()px,random()px) } 
}

/* Output example */
@keyframes a {
  iteration-count:5;
  0% { transform: translate(0.21132px,7.03611px) }
  20.000002% { transform: translate(0.54677px,7.33579px) }
  40.000004% { transform: translate(0.81947px,0.44721px) }
  60.000006% { transform: translate(0.37508px,8.40739px) }
  80.000008% { transform: translate(0.96671px,5.27559px) }  
  20% { transform: translate(0.19928px,0.67320px) }
  40.000002% { transform: translate(0.64069px,0.30237px) }
  60.000004% { transform: translate(0.59960px,0.10336px) }
  80.000006% { transform: translate(0.56983px,0.16258px) }
  100% { transform: translate(0.34149px,0.41830px) } 
}

Usage

Step 1: Install plugin:

npm install --save-dev postcss postcss-random-keyframe

Step 2: Check you project for existed PostCSS config: postcss.config.js in the project root, "postcss" section in package.json or postcss in bundle config.

If you do not use PostCSS, add it according to official docs and set this plugin in settings.

Step 3: Add the plugin to plugins list:

module.exports = {
  plugins: [
+   require('postcss-random-keyframe'),
    require('autoprefixer')
  ]
}

CSS Property

• random(min, max): means [min,max], random() means [0,1], random(num) means [0,num]
• iteration-count: used to iterate keyframe with offset, only effective in @keyframes rule

Options

type Options = {
  scope?: 'keyframe'|'global',// whether to use random() globally, or just in @keyframes. default: false
  floatingPoint?: number,   // the number of digits after decimal point, default: 7
  randomSeed?: number,      // initial seed to generate random number, default: 0
  offset?: number           // offset for iteration, default: 0.0000001
}