Google LOGO的CSS Sprite

Google LOGO的CSS Sprite_第1张图片
css-sprite

为纪念美国现代舞舞蹈家玛莎·葛兰姆诞辰,Google Doodle推出了一款极其炫酷的LOGO,整个LOGO使用CSS Sprite技术,利用一个初始图片和一张画满各个动作的拼接图片,实现了动画,而非传统的GIF动画图像。

效果

原文查看效果

CSS Sprite简介

CSS Sprites(css精灵),是一种网页图片应用处理方式。它允许你将一个页面涉及到的所有零星图片都包含到一张大图中去,这样一来,当访问该页面时,载入的图片就不会像以前那样一幅一幅地慢慢显示出来了。
限制:不高于200KB的单张图片

整合处理图片的目的是减少请求次数,如果每一张图片都向服务器发送请求,即影响服务器负载也影响页面性能。

CSS Sprite原理

CSS Sprites的原理就是把网页中用到的小图标、图片类集中整合到一张图片中。
再利用CSS中的背景属性

  • background-image
  • background-repeat
  • background-position

当需要显示指定图片时,定位到图片相应位置即可

Google粘土动画

实现步骤:
1、准备素材,设计动画的每一帧图片并整合成一张图片
2、监听点击事件执行动画
3、根据延迟时间设置图片背景位置以显示下一帧图片

素材

HTML

JS


Google舞蹈者

实现步骤:
1、准备素材,收集舞蹈者每一个动作集成到一张图片
2、初始化每一个动作的位置
3、定时动态创建div元素设置背景位置和元素位置

素材

Google LOGO的CSS Sprite_第2张图片

HTML


JS

(function () {
    window.google={};
        if (!google.doodle) google.doodle = {};
        var d = [
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                [307, 48, 89, 89],
                [307, 48, 91, 89],
                [305, 49, 93, 89],
                [305, 50, 93, 88],
                [305, 50, 93, 88],
                [306, 52, 92, 86],
                [305, 53, 93, 84],
                [305, 54, 94, 83],
                [306, 54, 93, 83],
                [307, 54, 92, 83],
                [307, 54, 92, 83],
                [308, 54, 90, 83],
                [308, 54, 90, 83],
                [306, 53, 91, 84],
                [306, 53, 91, 84],
                [308, 53, 90, 84],
                [308, 53, 90, 84],
                [305, 53, 92, 84],
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                [306, 52, 91, 85],
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                [308, 50, 88, 88],
                [308, 49, 88, 88],
                [307, 49, 89, 88],
                [307, 50, 89, 87],
                [308, 51, 89, 86],
                [307, 54, 90, 83],
                [307, 57, 90, 80],
                [306, 58, 92, 79],
                [306, 58, 92, 79],
                [305, 60, 92, 77],
                [302, 61, 95, 76],
                [302, 63, 95, 74],
                [302, 51, 96, 86],
                [302, 66, 98, 71],
                [304, 67, 96, 69],
                [301, 63, 96, 74],
                [301, 58, 93, 79],
                [291, 52, 94, 85],
                [288, 50, 71, 88],
                [285, 43, 76, 95],
                [285, 37, 70, 101],
                [281, 29, 55, 109],
                [278, 20, 58, 119],
                [278, 20, 55, 119, 1],
                [277, 12, 121, 127],
                [271, 2, 122, 138],
                [267, 1, 126, 139],
                [264, 0, 136, 140],
                [260, 0, 141, 140],
                [255, 0, 148, 140],
                [252, 0, 151, 140],
                [249, 2, 121, 138],
                [247, 3, 123, 137],
                [246, 3, 123, 137],
                [246, 2, 124, 137],
                [258, 2, 112, 137],
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                [259, 2, 138, 137],
                [254, 2, 126, 137],
                [247, 2, 101, 136],
                [240, 2, 108, 136],
                [238, 1, 110, 137],
                [230, 1, 118, 138],
                [220, 15, 128, 124],
                [211, 18, 137, 121],
                [205, 43, 102, 96],
                [202, 45, 104, 93],
                [200, 38, 97, 101],
                [198, 38, 104, 101, 1],
                [197, 39, 107, 100],
                [197, 39, 112, 100],
                [213, 39, 94, 110],
                [212, 40, 95, 111],
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                [209, 42, 99, 112],
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                [211, 37, 88, 112],
                [211, 20, 186, 131],
                [213, 27, 167, 122],
                [212, 44, 87, 105],
                [210, 44, 88, 98],
                [195, 44, 106, 98],
                [189, 44, 110, 98],
                [182, 46, 117, 99],
                [173, 44, 118, 96, 1],
                [161, 43, 130, 99],
                [154, 42, 137, 97],
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                [148, 13, 144, 126],
                [141, 12, 153, 127],
                [115, 11, 173, 128],
                [108, 7, 180, 133],
                [108, 4, 180, 136],
                [108, 3, 176, 137, 1],
                [108, 1, 161, 139],
                [105, 1, 235, 138],
                [103, 1, 295, 148],
                [103, 0, 277, 149],
                [108, 0, 234, 137],
                [101, 0, 232, 137],
                [99, 0, 135, 139],
                [95, 0, 244, 139],
                [81, 0, 152, 139],
                [69, 0, 164, 139, 1],
                [66, 0, 169, 139],
                [65, 0, 170, 139],
                [63, 0, 168, 138],
                [61, 0, 159, 138],
                [35, 0, 304, 139],
                [19, 0, 189, 140],
                [18, 11, 138, 129],
                [18, 11, 137, 129],
                [18, 11, 137, 128],
                [18, 6, 135, 133],
                [7, 4, 146, 136],
                [6, 4, 147, 136],
                [3, 4, 150, 136, 1],
                [3, 5, 150, 135],
                [3, 8, 150, 132],
                [4, 6, 394, 145],
                [12, 6, 388, 145],
                [11, 8, 389, 144],
                [11, 8, 387, 144],
                [11, 8, 387, 143, 1],
                [10, 8, 113, 131],
                [11, 8, 111, 131],
                [10, 9, 112, 130],
                [12, 9, 116, 130],
                [12, 9, 111, 130],
                [12, 9, 111, 130],
                [12, 9, 110, 131],
                [12, 34, 113, 106],
                [13, 35, 110, 104]
            ],
            e = d.length,
            f, g, h, i, j = -1,
            c = document.getElementById("graham-logo"),
            l = function () {
                var a = d[f];
                if (c && a[0]) {
                    var b = document.createElement("div");
                    b.id = "graham-logo" + f;
                    b.style.position = "absolute";
                    b.style.left = a[0] + "px";
                    b.style.top = a[1] + "px";
                    b.style.width = a[2] + "px";
                    b.style.height = a[3] + "px";
                    b.style.background = "url(/images/css-sprite/graham-sprite.png) no-repeat " + -g + "px " + -h + "px";
                    a[3] > i && (i = a[3]);
                    a[4] ? (g = 0, h += i, i = 0) : g += a[2];
                    c.appendChild(b);
                    ++f;
                    f < e && (j = window.setTimeout(l, 83))
                }
            },
            m = function () {
                google.doodle.a = !1;
                i = h = g = f = 0;
                j != -1 && (window.clearTimeout(j), j = -1);
                c.innerHTML = "";
                j = window.setTimeout(l, 83)
            };
            c.addEventListener ? c.addEventListener("click", m, !1) : c.attachEvent("onclick", m);
        if (!google.doodle.a) {
            google.doodle.a = !0;
            var n = document.createElement("img");
            n.addEventListener ? n.addEventListener("load", m, !1) : n.attachEvent("onload", m);
            n.src = "/images/css-sprite/graham-sprite.png"
        }
})();

总结

希望大家可以通过本文的Google动画实现了解到一些CSS Sprite技术,CSS Sprite是前端优化的一部分,合理的利用好可以提高网页的性能,也可以丰富网页内容。

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