CSS动画与网格图像中的Spritesheets（不在一行） [英] CSS animations with Spritesheets in a grid image (not in a row)

问题描述

我尝试为sprite图片设置动画，并找到了一个很好的例子：

I'm trying to animate a sprite image, and found this great example:

博客： http://simurai.com/blog/2012/12/03/step-animation/

JSFiddle： http://jsfiddle.net/simurai/CGmCe/

JSFiddle: http://jsfiddle.net/simurai/CGmCe/

.hi {
width: 50px;
height: 72px;
background-image: url("http://s.cdpn.io/79/sprite-steps.png");

-webkit-animation: play .8s steps(10) infinite;
   -moz-animation: play .8s steps(10) infinite;
    -ms-animation: play .8s steps(10) infinite;
     -o-animation: play .8s steps(10) infinite;
        animation: play .8s steps(10) infinite; }

@ - webkit-keyframes play {from {background-position：0px; }
to {background-position：-500px; }}

@-webkit-keyframes play { from { background-position: 0px; } to { background-position: -500px; } }

@ - moz-keyframes play {from {background-position：0px; }
到{background-position：-500px; }}

@-moz-keyframes play { from { background-position: 0px; } to { background-position: -500px; } }

@ - ms-keyframes play {from {background-position：0px; }
to {background-position：-500px; }}

@-ms-keyframes play { from { background-position: 0px; } to { background-position: -500px; } }

@ - o-keyframes play {from {background-position：0px; }
to {background-position：-500px; }}

@-o-keyframes play { from { background-position: 0px; } to { background-position: -500px; } }

@keyframes play {from {background-position：0px; }
to {background-position：-500px; }}

@keyframes play { from { background-position: 0px; } to { background-position: -500px; } }

我想做同样的事情，但使用一个正方形的动画条。例如，这一个：

I'd like to do the same thing, but using a square (power-or-two sized) image atlas instead of an animation strip. For example, this one:

推荐答案

由于这可能是一个难以调试的任务，我想从同样的问题开始，但在一个更容易调试的环境。

Since this can be a difficult to debug task, I would like to start with the same problem, but in an easier to debug environment.

我选择做一个矩形动画的整个图像。

I chose to do it as a rectangle animation over the full image.

.hi {
    width: 320px;
    height: 315px;
    background-image: url("http://i.stack.imgur.com/CjMscm.jpg");
    position: relative;
    border: solid 1px black;
}

.hi:before {
    content: "";
    position: absolute;
    width: 100%;
    height: 53px;
    left: 0px;
    top: 0px;
    border: solid 1px red;
    -webkit-animation: playv 18s steps(6) infinite; 
}

@-webkit-keyframes playv {
     0% { top:   0px; }
   100% { top: 315px; }
}

.hi:after {
    content: "";
    position: absolute;
    width: 53px;
    height: 100%;
    left: 266px;
    top: 0px;
    border: solid 1px red;
    -webkit-animation: playh 3s steps(6) infinite; 
}

@-webkit-keyframes playh {
     0% { left:   0px; }
   100% { left: 320px; }
}

<div class="hi">
</div>

元素，一个是行选择器，另一个是列选择器。

Over the image, I display 2 pseudo elements, one is the row selector and the other the column selector. And I adjust the animations until they are ok

---

现在，让我们验证是否同时设置了两个动画：

---

Now, lets verify that setting both animations at the same time works:

.hi {
    width: 320px;
    height: 315px;
    background-image: url("http://i.stack.imgur.com/CjMscm.jpg");
    position: relative;
    border: solid 1px black;
}

.hi:before {
    content: "";
    position: absolute;
    width: 53px;
    height: 53px;
    left: 0px;
    top: 0px;
    border: solid 1px red;
    -webkit-animation: playv 18s steps(6) infinite, playh 3s steps(6) infinite; 
}

@-webkit-keyframes playv {
     0% { top:   0px; }
   100% { top: 315px; }
}

@-webkit-keyframes playh {
     0% { left:   0px; }
   100% { left: 320px; }
}

<div class="hi">
</div>

---

现在最终的项目：

---

And now the final project:

.hi {
    width: 53px;
    height: 53px;
    background-image: url("http://i.stack.imgur.com/CjMscm.jpg");
    position: relative;
    border: solid 1px black;
    -webkit-animation: playv 1s steps(6) infinite, playh 0.1667s steps(6) infinite; 
    
}


@-webkit-keyframes playv {
     0% { background-position-y:   0px; }
   100% { background-position-y: -315px; }
}

@-webkit-keyframes playh {
     0% { background-position-x:   0px; }
   100% { background-position-x: -320px; }
}

<div class="hi">
</div>

IE和FF的前缀。
此外，在这种方法中，避免在左下角显示2个空白图像是不可能的。如果您没有完整的网格，并且不想显示空白图像，则需要逐个指定所有关键帧

All this for a webkit browser, remove prefixes for IE and FF. Also, in this approach it is imposible to avoid displaying the 2 blank images at the lower left corner. If you don't have a full grid, and don't want to display the empty images, you will need to specify all the keyframes one by one

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