This is a version of moving blocks done with jQuery and CSS3 transitions for optimum performance and minimum dependencies for a project that already employs jQuery.
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October 23, 2020 11:30
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jQuery background moving blocks
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| license: mit |
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| (function(jQuery) { | |
| var $container, width, height; | |
| function updateSize() { | |
| var $window = $(window); | |
| width = $window.width(); | |
| height = $window.height(); | |
| $container.css({ | |
| width: width, | |
| height: height | |
| }); | |
| } | |
| function position(a, margin) { | |
| var offset = a * (2 * width + 2 * height); | |
| if (offset < width) return [offset, -margin]; | |
| offset -= width; | |
| if (offset < height) return [width + margin, offset]; | |
| offset -= height; | |
| if (offset < width) return [width - offset, height + offset]; | |
| offset -= width; | |
| return [-margin, height - offset]; | |
| } | |
| function spawnElement() { | |
| var opacity = (0.3 + 0.7*Math.random()), | |
| size = 0.08 * (width + height) * (1.0 - opacity), | |
| duration = (1 - opacity) * 7, | |
| p1 = position(Math.random(), size), p2 = position(Math.random(), size); | |
| var $elem = $('<div/>') | |
| .addClass('block') | |
| .css({ | |
| left: p1[0], top: p1[1], | |
| width: size, height: size, | |
| marginLeft: -size/2, marginTop: -size/2, | |
| opacity: opacity, | |
| visibility: 'hidden', | |
| transition: 'all '+duration+'s linear' | |
| }) | |
| .on('transitionend', function() { | |
| $elem.remove(); | |
| }) | |
| .appendTo($container); | |
| setTimeout(function() { | |
| $elem.css({ | |
| left: p2[0], | |
| top: p2[1], | |
| visibility: 'visible' | |
| }); | |
| }, 100); | |
| } | |
| $(function() { | |
| $container = $('#blocks'); | |
| $(window).on('resize', updateSize); | |
| updateSize(); | |
| (function animation() { | |
| setTimeout(function() { | |
| requestAnimationFrame(animation); | |
| spawnElement(); | |
| }, 100); | |
| })(); | |
| }); | |
| })(jQuery); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Moving Blocks</title> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| .blocks-container { | |
| position: relative; | |
| overflow: hidden; | |
| } | |
| .block { | |
| position: absolute; | |
| background-color: #88a; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="blocks-container" id="blocks"></div> | |
| <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script> | |
| <script src="blocks.js" ></script> | |
| </body> | |
| </html> |
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