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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| ;(function (window) { | ||
| 'use strict' | ||
|
|
||
| const html = ` | ||
| <img class="proto mover" src="/javascript.svg"/> | ||
| <div class="controls"> | ||
| <button class="add"></button> | ||
| <button class="subtract" disabled></button> | ||
| <button class="stop">Stop</button> | ||
| <button class="optimize">Optimize</button> | ||
| <a href="https://developers.google.com/web/tools/chrome-devtools/evaluate-performance/" | ||
| target="_blank"> | ||
| <button class="optimize">Help</button> | ||
| </a> | ||
| </div> | ||
| ` | ||
|
|
||
| document.body.insertAdjacentHTML('beforeend', html) | ||
|
|
||
| var app = {}, | ||
| proto = document.querySelector('.proto'), | ||
| movers, | ||
| bodySize = document.body.getBoundingClientRect(), | ||
| ballSize = proto.getBoundingClientRect(), | ||
| maxHeight = Math.floor(bodySize.height - ballSize.height), | ||
| maxWidth = 97, // 100vw - width of square (3vw) | ||
| incrementor = 10, | ||
| distance = 3, | ||
| frame, | ||
| minimum = 10, | ||
| subtract = document.querySelector('.subtract'), | ||
| add = document.querySelector('.add') | ||
|
|
||
| app.optimize = false | ||
| app.count = minimum | ||
| app.enableApp = true | ||
|
|
||
| app.init = function () { | ||
| if (movers) { | ||
| bodySize = document.body.getBoundingClientRect() | ||
| for (var i = 0; i < movers.length; i++) { | ||
| document.body.removeChild(movers[i]) | ||
| } | ||
| document.body.appendChild(proto) | ||
| ballSize = proto.getBoundingClientRect() | ||
| document.body.removeChild(proto) | ||
| maxHeight = Math.floor(bodySize.height - ballSize.height) | ||
| } | ||
| for (var i = 0; i < app.count; i++) { | ||
| var m = proto.cloneNode() | ||
| var top = Math.floor(Math.random() * maxHeight) | ||
| if (top === maxHeight) { | ||
| m.classList.add('up') | ||
| } else { | ||
| m.classList.add('down') | ||
| } | ||
| m.style.left = i / (app.count / maxWidth) + 'vw' | ||
| m.style.top = top + 'px' | ||
| document.body.appendChild(m) | ||
| } | ||
| movers = document.querySelectorAll('.mover') | ||
| } | ||
|
|
||
| app.update = function (timestamp) { | ||
| for (var i = 0; i < app.count; i++) { | ||
| var m = movers[i] | ||
| if (!app.optimize) { | ||
| var pos = m.classList.contains('down') | ||
| ? m.offsetTop + distance | ||
| : m.offsetTop - distance | ||
| if (pos < 0) pos = 0 | ||
| if (pos > maxHeight) pos = maxHeight | ||
| m.style.top = pos + 'px' | ||
| if (m.offsetTop === 0) { | ||
| m.classList.remove('up') | ||
| m.classList.add('down') | ||
| } | ||
| if (m.offsetTop === maxHeight) { | ||
| m.classList.remove('down') | ||
| m.classList.add('up') | ||
| } | ||
| } else { | ||
| var pos = parseInt(m.style.top.slice(0, m.style.top.indexOf('px'))) | ||
| m.classList.contains('down') ? (pos += distance) : (pos -= distance) | ||
| if (pos < 0) pos = 0 | ||
| if (pos > maxHeight) pos = maxHeight | ||
| m.style.top = pos + 'px' | ||
| if (pos === 0) { | ||
| m.classList.remove('up') | ||
| m.classList.add('down') | ||
| } | ||
| if (pos === maxHeight) { | ||
| m.classList.remove('down') | ||
| m.classList.add('up') | ||
| } | ||
| } | ||
| } | ||
| frame = window.requestAnimationFrame(app.update) | ||
| } | ||
|
|
||
| document.querySelector('.stop').addEventListener('click', function (e) { | ||
| if (app.enableApp) { | ||
| cancelAnimationFrame(frame) | ||
| e.target.textContent = 'Start' | ||
| app.enableApp = false | ||
| } else { | ||
| frame = window.requestAnimationFrame(app.update) | ||
| e.target.textContent = 'Stop' | ||
| app.enableApp = true | ||
| } | ||
| }) | ||
|
|
||
| document.querySelector('.optimize').addEventListener('click', function (e) { | ||
| if (e.target.textContent === 'Optimize') { | ||
| app.optimize = true | ||
| e.target.textContent = 'Un-Optimize' | ||
| } else { | ||
| app.optimize = false | ||
| e.target.textContent = 'Optimize' | ||
| } | ||
| }) | ||
|
|
||
| add.addEventListener('click', function (e) { | ||
| cancelAnimationFrame(frame) | ||
| app.count += incrementor | ||
| subtract.disabled = false | ||
| app.init() | ||
| frame = requestAnimationFrame(app.update) | ||
| }) | ||
|
|
||
| subtract.addEventListener('click', function () { | ||
| cancelAnimationFrame(frame) | ||
| app.count -= incrementor | ||
| app.init() | ||
| frame = requestAnimationFrame(app.update) | ||
| if (app.count === minimum) { | ||
| subtract.disabled = true | ||
| } | ||
| }) | ||
|
|
||
| function debounce(func, wait, immediate) { | ||
| var timeout | ||
| return function () { | ||
| var context = this, | ||
| args = arguments | ||
| var later = function () { | ||
| timeout = null | ||
| if (!immediate) func.apply(context, args) | ||
| } | ||
| var callNow = immediate && !timeout | ||
| clearTimeout(timeout) | ||
| timeout = setTimeout(later, wait) | ||
| if (callNow) func.apply(context, args) | ||
| } | ||
| } | ||
|
|
||
| var onResize = debounce(function () { | ||
| if (app.enableApp) { | ||
| cancelAnimationFrame(frame) | ||
| app.init() | ||
| frame = requestAnimationFrame(app.update) | ||
| } | ||
| }, 500) | ||
|
|
||
| window.addEventListener('resize', onResize) | ||
|
|
||
| add.textContent = 'Add ' + incrementor | ||
| subtract.textContent = 'Subtract ' + incrementor | ||
| document.body.removeChild(proto) | ||
| proto.classList.remove('.proto') | ||
| app.init() | ||
| window.app = app | ||
| frame = window.requestAnimationFrame(app.update) | ||
| })(window) |
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