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camera CSS
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| A simple 2D camera over DOM elements. |
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| $screen = $('#screen') | |
| $world = $('#world') | |
| H = $screen.height() | |
| W = $screen.width() | |
| spotOn = (el, spec = {}) -> | |
| $target = $(el) | |
| spec = $.extend(true, { | |
| theta: 0 | |
| radian: false | |
| }, spec) | |
| bounds = bounding($target, spec.radian and spec.theta or deg2rad(spec.theta)) | |
| x = $target.position().left | |
| y = $target.position().top | |
| h = $target.height() | |
| w = $target.width() | |
| $world.animate | |
| scale: Math.min W / bounds.w, H / bounds.h | |
| rotate: "#{spec.radian and rad2deg(spec.theta) or spec.theta}deg" | |
| translateX: "#{W/2 - (x + w/2)}px" | |
| translateY: "#{H/2 - (y + h/2)}px" | |
| , 3000 | |
| ### | |
| Utilities | |
| ### | |
| deg2rad = (theta) -> | |
| theta * Math.PI / 180 | |
| rad2deg = (theta) -> | |
| theta * 180 / Math.PI | |
| bounding = (el, theta = 0) -> | |
| $el = $(el) | |
| w = $el.width() | |
| h = $el.height() | |
| # | |
| # Our rotation matrix | |
| # | |
| # see: http://en.wikipedia.org/wiki/Rotation_matrix | |
| # | |
| R = $M [ | |
| [Math.cos(theta), -Math.sin(theta)] | |
| [Math.sin(theta), Math.cos(theta)] | |
| ] | |
| # | |
| # Our 4 original points | |
| # | |
| A = $V [0, 0] | |
| B = $V [w, 0] | |
| C = $V [w, h] | |
| D = $V [0, h] | |
| # | |
| # Our four points, rotated | |
| # | |
| AA = R.multiply A | |
| BB = R.multiply B | |
| CC = R.multiply C | |
| DD = R.multiply D | |
| xs = [AA, BB, CC, DD].map((el) -> el.elements[0]) | |
| ys = [AA, BB, CC, DD].map((el) -> el.elements[1]) | |
| { | |
| w: Math.max.apply(null, xs) - Math.min.apply(null, xs) | |
| h: Math.max.apply(null, ys) - Math.min.apply(null, ys) | |
| } | |
| #console.log bounding($('#box1')) | |
| spotOn($('#box3'), {theta: 0}) | |
| spotOn($('#box1'), {theta: 0}) | |
| spotOn($('#box2'), {theta: 80}) | |
| spotOn($('#box2'), {theta: 360}) | |
| spotOn($('#box1'), {theta: 0}) | |
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| html, body {height:100%;} | |
| html {display:table; width:100%;} | |
| body {margin:0; display:table-cell; text-align:center; vertical-align:middle;} | |
| #screen {display:inline-block; outline:50em solid rgba(0,0,0,.2); width:300px; height:200px;} | |
| #world {position:relative; height:100%; z-index:-1;} |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8> | |
| <title></title> | |
| <link rel="stylesheet" href="index.css"> | |
| <script src="http://jashkenas.github.com/coffee-script/extras/coffee-script.js"></script> | |
| <script src="http://code.jquery.com/jquery-1.7.2.min.js"></script> | |
| <script src="https://rawgithub.com/heygrady/transform/master/dist/jquery.transform-0.9.3.min.js"></script> | |
| <script src="https://rawgithub.com/jcoglan/sylvester/master/src/sylvester.js"></script> | |
| <script src="https://rawgithub.com/jcoglan/sylvester/master/src/vector.js"></script> | |
| <script src="https://rawgithub.com/jcoglan/sylvester/master/src/matrix.js"></script> | |
| </head> | |
| <body> | |
| <div id="screen"><div id="world"> | |
| <div id="box1" style="width:1em; height:48px; background-color:red; position:absolute; top:15%; left:20%"></div> | |
| <div id="box2" style="width:15%; height:2.5em; background-color:green; position:absolute; bottom:5em; right:10%;"></div> | |
| <div id="box3" style="width:.5em; height:1em; background-color:yellowGreen; position:absolute; bottom:15em; left:20%;"></div> | |
| <div id="circle" style="width:50px; height:50px; position:absolute; top:50%; left:50%; margin-top:-25px; margin-left:-25px; border-radius:100%; background-color:yellow;"></div> | |
| </div></div> | |
| <script src="index.coffee" type="text/coffeescript"></script> | |
| </body> | |
| </html> |
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