TopLeft vs webkitTransform
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August 29, 2015 14:01
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TopLeft vs webkitTransform
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| #view { | |
| position: relative; | |
| height: 400px; | |
| width: 962px; | |
| background: #eee; | |
| overflow: hidden; | |
| } | |
| #content { | |
| position: relative; | |
| top: 0px; | |
| left: 0px; | |
| width: 2000px; | |
| height: 2000px; | |
| } | |
| .box { | |
| position: absolute; | |
| width: 40px; | |
| height: 40px; | |
| background: rgba(255, 50, 50, 0.1); | |
| border: 1px solid rgba(200, 200, 200, 0.3); | |
| } | |
| </style> | |
| <body> | |
| <div id="view"> | |
| <div id="content"> | |
| </div> | |
| </div> | |
| <select id="move"> | |
| <option value="topLeft">Position:Top/Left</option> | |
| <option value="matrix">Transform:Matrix</option> | |
| <option value="matrix3d">Transform:Matrix3d</option> | |
| </select> | |
| <script type="text/javascript" src="//rawgit.com/vpj/weya/master/weya.js"></script> | |
| <script> | |
| // Generated by CoffeeScript 1.7.1 | |
| (function() { | |
| var Ax, Ay, T, X, Y, elem, move, select, setPosition, template, transform, updatePosition; | |
| template = function() { | |
| var i, _i, _results; | |
| _results = []; | |
| for (i = _i = 0; _i < 10000; i = ++_i) { | |
| _results.push(this.div(".box", { | |
| style: { | |
| top: "" + (parseInt(2000 * Math.random())) + "px", | |
| left: "" + (parseInt(2000 * Math.random())) + "px" | |
| } | |
| })); | |
| } | |
| return _results; | |
| }; | |
| elem = document.getElementById("content"); | |
| Weya({ | |
| elem: elem | |
| }, template); | |
| Ax = 0.002; | |
| Ay = 0.001; | |
| X = 0; | |
| Y = 0; | |
| T = (new Date).getTime(); | |
| transform = { | |
| topLeft: function() { | |
| elem.style.top = "" + (parseInt(Y)) + "px"; | |
| return elem.style.left = "" + (parseInt(X)) + "px"; | |
| }, | |
| matrix: function() { | |
| return elem.style.webkitTransform = "matrix(1, 0, 0, 1, " + X + ", " + Y + ")"; | |
| }, | |
| matrix3d: function() { | |
| return elem.style.webkitTransform = "matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, " + X + ", " + Y + ", 0, 1)"; | |
| } | |
| }; | |
| move = function() { | |
| setPosition(); | |
| updatePosition(); | |
| return window.requestAnimationFrame(move); | |
| }; | |
| updatePosition = function() { | |
| var t; | |
| t = (new Date).getTime() - T; | |
| X = 100 * (-1 + Math.sin(Ax * t)); | |
| return Y = 100 * (-1 + Math.sin(Ay * t)); | |
| }; | |
| setPosition = transform.topLeft; | |
| select = document.getElementById('move'); | |
| select.addEventListener('change', function(e) { | |
| return setPosition = transform[select.value]; | |
| }); | |
| window.requestAnimationFrame(move); | |
| }).call(this); | |
| </script> | |
| </body> |
Thanks. Didn't get your question? This is a performance test between transform: matrix3d and top/left positioning. You can see it running at http://bl.ocks.org/vpj/c5468e4593319009320e
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nice dude , in fact i understand this in css3 (how to work) , can u tell me how to start learning or practicing to go forward in js ?