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2010-12-06-carousel-02-dynamic.html
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2010-12-06-carousel-02-dynamic.html
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---
layout: example
title: Carousel 2 - dynamic
category: examples
---
<style media="screen">
.container {
width: 210px;
height: 140px;
position: relative;
margin: 0 auto 40px;
border: 1px solid #CCC;
-webkit-perspective: 1100px;
-moz-perspective: 1100px;
-ms-perspective: 1100px;
-o-perspective: 1100px;
perspective: 1100px;
}
#carousel {
width: 100%;
height: 100%;
position: absolute;
-webkit-transform-style: preserve-3d;
-moz-transform-style: preserve-3d;
-ms-transform-style: preserve-3d;
-o-transform-style: preserve-3d;
transform-style: preserve-3d;
}
.ready #carousel {
-webkit-transition: -webkit-transform 1s;
-moz-transition: -moz-transform 1s;
-ms-transition: -ms-transform 1s;
-o-transition: -o-transform 1s;
transition: transform 1s;
}
#carousel.panels-backface-invisible figure {
-webkit-backface-visibility: hidden;
-moz-backface-visibility: hidden;
-ms-backface-visibility: hidden;
-o-backface-visibility: hidden;
backface-visibility: hidden;
}
#carousel figure {
display: block;
position: absolute;
width: 186px;
height: 116px;
left: 10px;
top: 10px;
border: 2px solid black;
line-height: 116px;
font-size: 80px;
font-weight: bold;
color: white;
text-align: center;
}
.ready #carousel figure {
-webkit-transition: opacity 1s, -webkit-transform 1s;
-moz-transition: opacity 1s, -moz-transform 1s;
-ms-transition: opacity 1s, -ms-transform 1s;
-o-transition: opacity 1s, -o-transform 1s;
transition: opacity 1s, transform 1s;
}
</style>
</head>
<body>
<h1>{{ page.title }}</h1>
<section class="container">
<div id="carousel">
<figure>1</figure>
<figure>2</figure>
<figure>3</figure>
<figure>4</figure>
<figure>5</figure>
<figure>6</figure>
<figure>7</figure>
<figure>8</figure>
<figure>9</figure>
<figure>10</figure>
<figure>11</figure>
<figure>12</figure>
<figure>13</figure>
<figure>14</figure>
<figure>15</figure>
<figure>16</figure>
<figure>17</figure>
<figure>18</figure>
<figure>19</figure>
<figure>20</figure>
</div>
</section>
<section id="options">
<p>
<label for="panel-count">panels</label>
<input type="range" id="panel-count" value="9" min="3" max="20" />
</p>
<p id="navigation">
<button id="previous" data-increment="-1">Previous</button>
<button id="next" data-increment="1">Next</button>
</p>
<p>
<button id="toggle-axis">Toggle Carousel Axis</button>
</p>
<p>
<button id="toggle-backface-visibility">Toggle Backface Visibility</button>
</p>
</section>
<script src="../js/utils.js"></script>
<script>
var transformProp = Modernizr.prefixed('transform');
function Carousel3D ( el ) {
this.element = el;
this.rotation = 0;
this.panelCount = 0;
this.totalPanelCount = this.element.children.length;
this.theta = 0;
this.isHorizontal = true;
}
Carousel3D.prototype.modify = function() {
var panel, angle, i;
this.panelSize = this.element[ this.isHorizontal ? 'offsetWidth' : 'offsetHeight' ];
this.rotateFn = this.isHorizontal ? 'rotateY' : 'rotateX';
this.theta = 360 / this.panelCount;
// do some trig to figure out how big the carousel
// is in 3D space
this.radius = Math.round( ( this.panelSize / 2) / Math.tan( Math.PI / this.panelCount ) );
for ( i = 0; i < this.panelCount; i++ ) {
panel = this.element.children[i];
angle = this.theta * i;
panel.style.opacity = 1;
panel.style.backgroundColor = 'hsla(' + angle + ', 100%, 50%, 0.8)';
// rotate panel, then push it out in 3D space
panel.style[ transformProp ] = this.rotateFn + '(' + angle + 'deg) translateZ(' + this.radius + 'px)';
}
// hide other panels
for ( ; i < this.totalPanelCount; i++ ) {
panel = this.element.children[i];
panel.style.opacity = 0;
panel.style[ transformProp ] = 'none';
}
// adjust rotation so panels are always flat
this.rotation = Math.round( this.rotation / this.theta ) * this.theta;
this.transform();
};
Carousel3D.prototype.transform = function() {
// push the carousel back in 3D space,
// and rotate it
this.element.style[ transformProp ] = 'translateZ(-' + this.radius + 'px) ' + this.rotateFn + '(' + this.rotation + 'deg)';
};
var init = function() {
var carousel = new Carousel3D( document.getElementById('carousel') ),
panelCountInput = document.getElementById('panel-count'),
axisButton = document.getElementById('toggle-axis'),
navButtons = document.querySelectorAll('#navigation button'),
onNavButtonClick = function( event ){
var increment = parseInt( event.target.getAttribute('data-increment') );
carousel.rotation += carousel.theta * increment * -1;
carousel.transform();
};
// populate on startup
carousel.panelCount = parseInt( panelCountInput.value, 10);
carousel.modify();
axisButton.addEventListener( 'click', function(){
carousel.isHorizontal = !carousel.isHorizontal;
carousel.modify();
}, false);
panelCountInput.addEventListener( 'change', function( event ) {
carousel.panelCount = event.target.value;
carousel.modify();
}, false);
for (var i=0; i < 2; i++) {
navButtons[i].addEventListener( 'click', onNavButtonClick, false);
}
document.getElementById('toggle-backface-visibility').addEventListener( 'click', function(){
carousel.element.toggleClassName('panels-backface-invisible');
}, false);
setTimeout( function(){
document.body.addClassName('ready');
}, 0);
};
window.addEventListener( 'DOMContentLoaded', init, false);
</script>