Javascriptings/parallax.es5.html at master · methodog/Javascriptings · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" />
	<meta name="apple-mobile-web-app-capable" content="yes">
	<meta name="apple-mobile-web-app-status-bar-style" content="black" />
    <title>parallax</title>
    <style type="text/css">
        html, body { height:100%; margin:0; }
        body { background:#000; font:14px/1 helvetica,arial,freesans,sans-serif; }
        .parallaxer { height:100%; width:100%; overflow:hidden; position:relative; left:0; top:0; user-select:none; }
        .parallaxer img { max-height:100%; max-width:100%; margin:auto; position:absolute; left:0; top:0; bottom:0; right:0; }
    </style>
</head>

<body>
<div class="parallaxer js-parallaxer">
  <img alt="" src="img/parallax/layer2.1.jpg">
  <img alt="" src="img/parallax/layer2.2.png">
  <img alt="" src="img/parallax/layer2.3.png">
  <img alt="" src="img/parallax/layer2.2.png">
  <img alt="" src="img/parallax/layer2.3.png">
</div>

<script type="text/javascript">
'use strict';

function getComputed(el, style) {
  if (window.getComputedStyle) {
    var y = document.defaultView.getComputedStyle(el, null).getPropertyValue(style);
  } else if (el.currentStyle) {
    if (style == 'width') {
      y = el.getBoundingClientRect().right - el.getBoundingClientRect().left;
    } else if (style == 'height') {
      y = el.getBoundingClientRect().bottom - el.getBoundingClientRect().top;
    } else {
      var y = el.currentStyle[style];
    }
  }return parseFloat(y);
}
function getEventXY(e) {
  var xy = [];
  if (e.touches && e.touches.length) {
    if (e.touches.length > 1) {
      xy[0] = (e.touches[0].pageX + e.touches[0].pageX) / 2;
      xy[1] = (e.touches[0].pageY + e.touches[0].pageY) / 2;
    } else {
      xy[0] = e.touches[0].pageX;
      xy[1] = e.touches[0].pageY;
    }
  } else {
    xy[0] = e.pageX;
    xy[1] = e.pageY;
  }
  return xy;
}

var parallaxers = document.querySelectorAll(".js-parallaxer");

if (parallaxers.length) {
  var painter = {
    id: 1,
    size: function size(el) {
      el.wh = [parseInt(getComputed(el, 'width')), Math.ceil(getComputed(el, 'height'))];
      el.xy = [parseInt(getComputed(el, 'left')), Math.ceil(getComputed(el, 'top'))];
    },
    init: function init(el) {
      el.imgs = el.getElementsByTagName('img');
      el.scale = 3.4;
      el.xlate = [0, 0];
      el.pinchDelta = 0;
      if (!el.paint) {
        el.id = el.id || 'parallaxer' + painter.id++;
        el.css = el.appendChild(document.createElement('style'));
        el.paint = function () {
          var css = '';
          for (var i = 0; i < el.imgs.length; i++) {
            css += '#' + el.id + ' :nth-child(' + (i + 1) + '){ -webkit-transform: -webkit-scale(' + (.5 + el.scale * i * i / 100) + ') -webkit-translate(' + -el.xlate[0] * i * i * 5 / el.scale + '%  , ' + -el.xlate[1] * i * i * 5 / el.scale + '%) }';
            css += '#' + el.id + ' :nth-child(' + (i + 1) + '){ transform: scale(' + (.5 + el.scale * i * i / 100) + ') translate(' + -el.xlate[0] * i * i * 5 / el.scale + '%  , ' + -el.xlate[1] * i * i * 5 / el.scale + '%) }';
          }
          window.requestAnimationFrame(function () {
            el.css.innerHTML = css;
          });
        };
        el.move = function (xy) {
          el.xlate = xy;
        };
        el.zoom = function (z) {
          el.scale += z;
          if (el.scale < 1) {
            el.scale = 1;
          }
        };
        el.paint();
        el.onmousemove = painter.touch.bind(null, el);
        el.onwheel = painter.touch.bind(null, el);
        el.ontouchmove = painter.touch.bind(null, el);
      }
    },
    touch: function touch(el, e) {
      var xyE = getEventXY(e);
      if (!el.w) {
        painter.size(el);
      }
      if (e.type === 'wheel') {
        el.zoom(e.deltaY > 0 ? -1 : 1);
      } else {
        if (e.touches && e.touches.length === 2) {
          var pinchDeltaPrevious = el.pinchDelta;
          el.pinchDelta = Math.sqrt(Math.pow(e.touches[0].pageX - e.touches[1].pageX, 2) + Math.pow(e.touches[0].pageY - e.touches[1].pageY, 2));
          if (pinchDeltaPrevious) {
            el.zoom((el.pinchDelta - pinchDeltaPrevious) / 20);
          }
        } else {
          var mvGain = (!e.touches) ? 1 : 5;
          el.move([(xyE[0] - (el.xy[0] + el.wh[0] / 2)) * mvGain / el.wh[0], (xyE[1] - (el.xy[1] + el.wh[1] / 2)) * mvGain / el.wh[1]]);
        }
      }
      el.paint();
    }
  };

  for (var i = 0; i < parallaxers.length; i++) {
    painter.init(parallaxers[i]);
  }
}
</script>
</body>
</html>