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旋转木马 简单实现
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| "use strict" | |
| ( ($) -> | |
| loadImage = ($image, src, callback) -> | |
| $image.bind "load", (e) -> | |
| $image.unbind "load" | |
| callback $image | |
| .each -> | |
| if $image[0].complete | |
| $image.trigger "load" | |
| if $.browser.webkit | |
| $image.attr 'src', '' | |
| $image.attr 'src', src | |
| createItem = ($image, angle, options) -> | |
| loaded = false | |
| sizeRange = (1 - options.minScale) * 0.5 | |
| orgWidth = orgHeight = 0 | |
| $image.css | |
| opacity: 0 | |
| position: 'absolute' | |
| $originDiv = $image.wrap('<div style="position: absolute;">').parent() | |
| loadImage $image, $image.attr('src'), ($image) -> | |
| loaded = true | |
| orgWidth = $image.width() | |
| orgHeight = $image.height() | |
| $image.animate | |
| opacity: 1 | |
| , 1000 | |
| that = | |
| update: (ang) -> | |
| ang += angle | |
| sinVal = Math.sin(ang) | |
| # 图形变换核心的三句代码 | |
| scale = ((sinVal + 1) * sizeRange) + options.minScale | |
| x = ((Math.cos(ang) * options.radiusX) * scale) + options.width / 2 | |
| y = ((sinVal * options.radiusY) * scale) + options.width / 2 | |
| # 这里是控制图片的旋转，外层div | |
| $originDiv.css | |
| left: (x >> 0) + 'px' | |
| top: (y >> 0) + 'px' | |
| zIndex: (scale * 100) >> 0 | |
| # 这里只是判断图片是否被加载 | |
| # 这里只是图片在原地变大缩小，不会旋转 | |
| if loaded | |
| $image.css | |
| width: (orgWidth * scale) + 'px' | |
| height: (orgHeight * scale) + 'px' | |
| top: ((-orgHeight * scale) / 2 ) + 'px' | |
| left: ((-orgWidth * scale) / 2 ) + 'px' | |
| return that | |
| createCarousel = ($wrap, options) -> | |
| items = [] | |
| rot = 0 | |
| pause = false | |
| unpauseTimeout = 0 | |
| rotAmount = (Math.PI * 2) * (options.frameRate/options.rotRate) | |
| $images = $('img', $wrap) | |
| spacing = (Math.PI / $images.length) * 2 | |
| angle = Math.PI / 2 | |
| $wrap.bind 'mouseover mouseout', (e) -> | |
| if !$(e.target).is('img') | |
| return | |
| if e.type is 'mouseover' | |
| clearTimeout unpauseTimeout | |
| pause = true | |
| else | |
| unpauseTimeout = setTimeout -> | |
| pause = false | |
| , 200 | |
| for image in $images | |
| console.log image | |
| item = createItem $(image), angle, options | |
| items.push item | |
| angle += spacing | |
| setInterval -> | |
| if !pause | |
| rot += rotAmount | |
| for item in items | |
| item.update rot | |
| , options.frameRate | |
| $.fn.Carousel = (options) -> | |
| options = $.extend {}, $.fn.Carousel.defaults, options | |
| # this.each -> | |
| # options = $.extend {}, $.fn.Carousel.defaults, options | |
| $(this).css | |
| position: 'relative' | |
| width: options.width + 'px' | |
| height: options.height + 'px' | |
| createCarousel $(this), options | |
| $.fn.Carousel.defaults = | |
| radiusX: 230 | |
| radiusY: 80 | |
| width: 512 | |
| height: 300 | |
| frameRate: 30 | |
| rotRate: 5000 | |
| minScale: 0.60 | |
| return | |
| )(jQuery) | |
| $ -> | |
| $('.carousel').Carousel | |
| width: 512 | |
| height: 300 | |
| radiusX: 220 | |
| radiusY: 70 | |
| minScale: 0.6 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> | |
| <title>Carousel</title> | |
| <meta name="description" content=""></meta> | |
| <meta name="viewport" content="width=device-width"></meta> | |
| <script type="text/javascript" src="jquery-1.8.2.min.js"></script> | |
| <script type="text/javascript" src="app.js"></script> | |
| </head> | |
| <body> | |
| <h1>Carousel</h1> | |
| <div class="carousel" ><!-- This is the wrapping element --> | |
| <a href="http://en.wikipedia.org/wiki/Self-portrait_(Leonardo_da_Vinci)" target="_blank"> | |
| <img src="pic1.png" alt="Pic 1"/> | |
| </a> | |
| <img id="pic2" src="pic2.png" alt="Pic 2"/> | |
| <img src="pic3.png" alt="Pic 3"/> | |
| <img src="pic4.png" alt="Pic 4"/> | |
| <img src="pic5.png" alt="Pic 5"/> | |
| <img src="pic6.png" alt="Pic 6"/> | |
| <img src="pic7.png" alt="Pic 7"/> | |
| <img src="pic8.png" alt="Pic 8"/> | |
| <img src="pic9.png" alt="Pic 9"/> | |
| </div> | |
| <footer> | |
| <address> | |
| <a href="mailto:creamidea%40gmail.com">creamidea</a> | |
| </address> | |
| </footer> | |
| </body> | |
| </html> |
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核心的三句代码：
然后图形更新使用一个定时器。
unpauseTimeout用于延时触发，避免误触发