CSS透明长阴影 [英] CSS Transparent Long Shadows

问题描述

所以我的任务是创建长阴影，但在带纹理的背景。在线的其他教程都是如何做的一个坚实的背景，看起来非常可怕的纹理或图像的背景。

So I was tasked with creating long shadows but on a textured background. The other tutorials online are all how to do it with a solid background which looks pretty terrible on textures or images for backgrounds.

我很接近它，试图几个不同的技术，但我来到两个可能性，每个有问题，所以如果任何人可以帮助我调试或者将非常感谢。这些都不是跨浏览器，我只是想弄明白最小如果它是可行的，请忽略缺少前缀等。

I got pretty close with it, trying a few different techniques but I came down to two possibilities, each with problems, so if anyone can help me debug either it would be greatly appreciated. These are not cross browser, I am just trying to figure out bare minimum if it is doable so please ignore lack of prefixes etc.

类型1：纯CSS
在CSS中使用Skew选项我可以在左边和底部添加一个渐变的两个块。然后倾斜每个45度，我接近所需的效果，但有一条线之间的阴影不完全满足，我不能得到走开，没有重叠：
http://jsfiddle.net/mfeola/4bfrkagu/

.block:before, .block:after{
    content:"";position:absolute; display:block;
}

.block:before{top:0; left:100%; height:100%; width:0; padding-right:100%;
    transform-origin: 0% 0%;
    transform: skew(0deg, 45deg);
    background: linear-gradient(to right,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0) 50%,rgba(0,0,0,0) 100%);
}
.block:after{top:100%; left:0; width:100%; height:0; padding-top:100%;
    transform-origin: 0% 0%;
    transform: skew(45deg, 0deg);
    background: linear-gradient(to bottom,  rgba(0,0,0,0.5) 0%,rgba(0,0,0,0) 50%,rgba(0,0,0,0) 100%);
}

类型2：Javascript
旋转数学计算出来，能够旋转梯度框，使一个完美的阴影。问题是如果盒子的大小改变，阴影的角度改变，这不工作，我想要做的。我希望它普遍工作。当我计算出数学时，我在这个文章中包含了一个textarea：
http://jsfiddle.net / mfeola / tpdhLqs1 /

Type 2: Javascript With rotational math figured out, I was able to rotate a gradient box to make a perfect shadow. The problem is if the size of the box changes, the angle of the shadow changes and that doesn't work for what I am trying to do. I would like it to work universally. I included a textarea on this one when I was figuring out the math: http://jsfiddle.net/mfeola/tpdhLqs1/

推荐答案

您可以尝试添加边框渐变以填补空白。

You could try adding a border gradient to fill the gap.

尝试使用此链接： https：// css -tricks.com/examples/GradientBorder/

无法获得正确的颜色，但我认为您应该能够使用一些边框渐变格式如下：

Couldn't get the exact colors right, but I think you should be able to do this using some border gradient formatting as follows:

.top-to-bottom {
    border-right: 0 !important;
    border-left: 0 !important;
    border-top: 0 !important;
    border: 1px solid;
    -webkit-border-image: 
      -webkit-gradient(linear, 0 0, 0 100%, from(rgba(0,0,0,0.5)), to(rgba(0,0,0,1))) 1 100%;
    -webkit-border-image: 
      -webkit-linear-gradient(rgba(0,0,0,0.5), rgba(0, 0, 0, 1)) 1 100%;
    -moz-border-image:
      -moz-linear-gradient(rgba(0,0,0,0.5), rgba(0, 0, 0, 1)) 1 100%;    
    -o-border-image:
      -o-linear-gradient(rgba(0,0,0,0.5), rgba(0, 0, 0, 1)) 1 100%;
    border-image:
      linear-gradient(to bottom, rgba(0,0,0,0.5), rgba(0, 0, 0, 1)) 1 100%;
}

在这里搞乱了： http://jsfiddle.net/4bfrkagu/13/ 但无法得到着色权 - 我想我可以把它留给你。

Was messing around with it a bit here: http://jsfiddle.net/4bfrkagu/13/ but couldn't get the coloring right - figured I could leave that to you.

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