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HTML

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <canvas id="main-canvas"></canvas>
<div id="instructions">Press <kbd>C</kbd> or <kbd>F</kbd></div>
<div id="custom-text">
  <textarea id="text-input" placeholder="Enter Text"></textarea>
  <button id="apply-button">Apply</button>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Amatic+SC:400');

html, body {
  touch-action: manipulation;
}
body {
  font-family: sans-serif;
  background: linear-gradient(135deg, #ecaeb5, #ffecb1);
}
*:focus {
  outline: none;
  border-radius: 2px;
  box-shadow: 0 0 0 3px fade(#fee12a, 50%);
}

#main-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

#instructions {
  font-size: 24px;
  opacity: 0.5;
  
  kbd {
    font-family: sans-serif;
    border: 1px solid currentColor;
    padding: 0 0.2em;
    border-radius: 2px;
  }
}

#custom-text {
  position: fixed;
  background: rgba(0, 0, 0, 0.1);
  font-family: sans-serif;
  bottom: 0;
  color: #fff;
  border-top-left-radius: 2px;
  border-top-right-radius: 2px;
  transition: transform 0.3s;
  padding: 0 1em;
  
  &:not(:hover) {
    transform: ~"translateY(calc(100% - 1.4em))";
  }
  
  &::before {
    content: 'Custom Text';
    display: block;
    text-align: center;
    padding: 0.2em;
  }
  
  #text-input {
    font: inherit;
    background: none;
    border: none;
    color: inherit;
  }
  #apply-button {
    font: inherit;
    display: block;
    background: none;
    border: none;
    width: 100%;
    color: #fee12a;
    padding: 0.4em;
    
    &:active {
      color: darken(#fee12a, 10%);
    }
  }
}
!

JS 

              
                canvas = document.querySelector '#main-canvas'
ctx = canvas.getContext '2d'

width = 0
height = 0
scale = 1

updateSize = ->
  width = innerWidth
  height = innerHeight
  scale = devicePixelRatio
  canvas.width = width * scale
  canvas.height = height * scale

updateSize()
window.addEventListener 'resize', updateSize

# # # # # # # # # # # #

font = '24px Amatic SC, sans-serif'
padding = -1

mctx = document.createElement('canvas').getContext '2d'
measureText = (font, text) ->
  mctx.font = font
  mctx.measureText(text).width

textBubbles = []
class TextBubble extends Trace.Object
  constructor: ->
    super()
    
    textBubbles.push this
    
    @text = new Trace.AnimatedString ''
    @chars = new Trace.AnimatedNumber 0
    @visibility = new Trace.AnimatedNumber 1
    @width = new Trace.AnimatedNumber 0
    @width.interpolatorSettings = spring: [900, 70]
    @width.interpolator = Trace.AnimatedNumber.springInterpolator
    @height = new Trace.AnimatedNumber 0
    @height.interpolatorSettings = spring: [900, 70]
    @height.interpolator = Trace.AnimatedNumber.springInterpolator
    @positions = []
    @widths = []
    @offsets = []
    @springs = []
    @timer = 0
    
    @typeset 0
  
  typeset: (t) ->
    @positions = []
    @widths = []
    @offsets = []
    text = @text.getValue t, 0
    @springs = [] if text.length isnt @springs.length
    width = 0
    posX = 0
    posY = 0
    for char, i in text
      charWidth = measureText font, char
      @positions.push [posX, posY]
      posX += padding + charWidth
      if char is ' '
        posX += 3
        if posX > 180 || posX + measureText(text.substr(i).split(/\s/)[0]) > 180
          posX = 0
          posY += 22
      @widths.push charWidth
      @offsets.push Math.random()
      if not @springs[i]
        spring = new Trace.AnimatedNumber 0
        spring.interpolatorSettings =
          spring: [900, 35]
        spring.interpolator = Trace.AnimatedNumber.springInterpolator
        @springs.push spring
      width = posX if posX > width
    @width.defaultValue = width
    @height.defaultValue = posY
  
  drawSelf: (ctx, transform, t, dt) ->
    Trace.Utils.setTransformMatrix ctx, transform
    
    @timer += dt
    text = @text.getValue t, dt
    chars = @chars.getValue t, dt
    visibility = @visibility.getValue t, dt
    
    if text isnt @lastText
      @typeset t
      @lastText = text

    width = @width.getValue t, dt
    height = @height.getValue t, dt
    
    ctx.globalAlpha = @opacity.getValue t, dt
      
    ctx.fillStyle = '#000'
    ctx.beginPath()
    top = -height / 2 - 14
    left = -width / 2 - 10
    right = width / 2 + 10
    bottom = height / 2 + 14
    
    state = Math.floor 3 * (@timer % 1)
    da = 10 + 5 * state
    db = 8 + 6 * Math.sin state
    dc = 1 + 0.015 * Math.cos state
    dd = 14 - 2 * state
    de = 10 + 2 * state
    
    ctx.moveTo left + dc, top
    ctx.bezierCurveTo left + da, dc * top * 2, right - dd, top * 2, right, top
    ctx.bezierCurveTo right + 5, top + 10, right + 5, bottom - 10, right, bottom
    ctx.bezierCurveTo right - db, bottom * 2, left + 10, bottom * 2, left, bottom
    ctx.bezierCurveTo left - 5, bottom - de, left - 5, top + 10, left + dc, top
    ctx.fill()
    
    ctx.fillStyle = '#fff'
    ctx.font = font
    ctx.textBaseline = 'middle'
    ctx.textAlign = 'center'
    ctx.translate -width / 2, -height / 2

    for char, i in text
      cscale = 1
      if i + 1 > Math.floor chars
        cscale = 0
      cvis = 1 - ((1 - visibility) * (1 + @offsets[i]))
      cvis = Math.max 0, cvis
      @springs[i].defaultValue = cscale
      value = @springs[i].getValue t, dt
      value = Math.max 0, value
      value *= cvis
      ctx.save()
      ctx.globalAlpha *= value
      ctx.translate @positions[i]...
      ctx.translate @widths[i] / 2, 0
      ctx.scale 1 - 0.5 * (1 - value), 1 - 0.25 * (1 - value)
      ctx.rotate (Math.floor(3 * ((@timer + @offsets[i]) % 1)) - 1.5) / 70
      ctx.fillText char, 0, 0
      ctx.restore()

timeline = new Trace.Timeline ctx
timeline.run()
window.t = timeline

viewport = new Trace.Viewport
timeline.addChild viewport
viewport.canvasWidth = width
viewport.canvasHeight = height
viewport.canvasScale = scale
window.addEventListener 'resize', ->
  viewport.canvasWidth = innerWidth
  viewport.canvasHeight = innerHeight

viewport.width = 150
viewport.height = 100

bubbleForLines = (lines, time = 0) ->
  bubble = new TextBubble
  markers = []
  bubble.transform.scaleX.addKey time, 0
  bubble.transform.scaleX.addKey time + 0.25, 1, Trace.Easing.easeOutExpo
  bubble.transform.scaleY.addKey time, 0
  bubble.transform.scaleY.addKey time + 0.25, 1, Trace.Easing.easeOutExpo
  t = time
  for line in lines
    bubble.text.addKey t, line
    bubble.visibility.addKey t, 1, Trace.Easing.step
    bubble.chars.addKey t, 0, Trace.Easing.step
    for char, i in line
      if char is '.'
        t += 0.1
      else
        t += 0.025
      bubble.chars.addKey t, i + 1
    markers.push t
    bubble.visibility.addKey t, 1
    t += 0.25
    bubble.visibility.addKey t, 0, Trace.Easing.easeInExpo
    bubble.chars.addKey t, line.length
    t += 0.05
  t -= 0.25
  bubble.transform.scaleX.addKey t, 1
  bubble.transform.scaleY.addKey t, 1
  t += 0.25
  bubble.transform.scaleX.addKey t, 0, Trace.Easing.easeInExpo
  bubble.transform.scaleY.addKey t, 0, Trace.Easing.easeInExpo
  
  [bubble, markers, t]

container = new Trace.Object
[bubble, markers, length] =  bubbleForLines [
  'life goes on'
  'it feels so long'
  'but i report'
  'life is too short'
]
container.addChild bubble
timeline.markers.set t, 0 for t in markers
viewport.addChild container
container.addKeys
  transform:
    translateX: 75
    translateY: 50

timeline.duration = length + 0.5
timeline.loop = yes
try
  timeline.play()
catch err
  timeline.paused = false
  console.log err
  console.log timeline.play

keyDown = false
window.addEventListener 'keydown', (e) ->
  return if e.target instanceof HTMLTextAreaElement
  if e.key is 'f' or e.key is 'c'
    return if keyDown
    keyDown = true
    timeline.play()
    timeline.playbackRate = 1.5

window.addEventListener 'keyup', (e) ->
  return if e.target instanceof HTMLTextAreaElement
  if e.key is 'f' or e.key is 'c'
    keyDown = false
    timeline.playbackRate = 1

canvas.addEventListener 'touchstart', (e) ->
  return if keyDown
  e.preventDefault()
  keyDown = true
  timeline.play()
  timeline.playbackRate = 1.5

touchEndHandler = (e) ->
  e.preventDefault()
  keyDown = false
  timeline.playbackRate = 1

canvas.addEventListener 'touchend', touchEndHandler
canvas.addEventListener 'touchcancel', touchEndHandler

new FontFaceObserver('Amatic SC').load().then ->
  console.log 'loaded'
  bubble.typeset timeline.currentTime for bubble in textBubbles

document.querySelector('#apply-button').addEventListener 'click', (e) ->
  content = document.querySelector('#text-input').value
  container.removeChild bubble
  [bubble, markers, length] = bubbleForLines content.split '\n'
  container.addChild bubble
  timeline.currentTime = 0
  timeline.duration = length + 0.5
  timeline.markers = new Map() # probably shouldn't do that
  timeline.markers.set t, 0 for t in markers
  timeline.play()
!
999px

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