我想为我使用 d3 和 SVG 制作的绘图添加阴影,但我遇到了阴影与相邻元素重叠的问题。请参阅下图了解它当前的外观。请注意,中间的六边形似乎具有不同的高度,因为在其中一些六边形的顶部渲染了阴影。我想要做的是以这样一种方式设置阴影,使它们只在背景上呈现,而不是在其他相邻的六边形之上。
这是当前如何定义阴影的代码:
var filter = defs.append("filter")
.attr("id", "drop-shadow")
.attr("height", "130%");
// SourceAlpha refers to opacity of graphic that this filter will be applied to
// convolve that with a Gaussian with standard deviation 3 and store result
// in blur
filter.append("feGaussianBlur")
.attr("in", "SourceAlpha")
.attr("stdDeviation", 1)
.attr("result", "blur");
// translate output of Gaussian blur to the right and downwards with 2px
// store result in offsetBlur
filter.append("feOffset")
.attr("in", "blur")
.attr("dx", 1)
.attr("dy", 1)
.attr("result", "offsetBlur");
// overlay original SourceGraphic over translated blurred opacity by using
// feMerge filter. Order of specifying inputs is important!
var feMerge = filter.append("feMerge");
feMerge.append("feMergeNode")
.attr("in", "offsetBlur")
feMerge.append("feMergeNode")
.attr("in", "SourceGraphic");
然后将这些样式应用于六边形:
d3.select(this).style("filter", "url(#drop-shadow)")
最佳答案
您不需要在两层中创建一大堆重复项。您需要做的就是将所有六边形包裹在一个组中 (<g>
) 并对其应用过滤器。
<svg>
<defs>
<filter id="drop-shadow" width="150%" height="150%">
<feGaussianBlur in="SourceAlpha" stdDeviation="3" result="blur"/>
<feOffset in="blur" dx="2" dy="2" result="offsetBlur"/>
<feMerge>
<feMergeNode in="offsetBlur"/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
<rect x="75" y="75" width="50" height="50" fill="cyan"
filter="url(#drop-shadow)"/>
<rect x="75" y="25" width="50" height="50" fill="gold"
filter="url(#drop-shadow)"/>
<rect x="25" y="75" width="50" height="50" fill="lime"
filter="url(#drop-shadow)"/>
<rect x="25" y="25" width="50" height="50" fill="red"
filter="url(#drop-shadow)"/>
<g filter="url(#drop-shadow)" transform="translate(150,0)">
<rect x="75" y="75" width="50" height="50" fill="cyan"/>
<rect x="75" y="25" width="50" height="50" fill="gold"/>
<rect x="25" y="75" width="50" height="50" fill="lime"/>
<rect x="25" y="25" width="50" height="50" fill="red"/>
</g>
</svg>
关于javascript - SVG 投影分层,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45558251/