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标签 javascript css web svg
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我需要动态改变 stroke-width 并且我需要保持圆的内半径不变。
<g fill="none" :stroke-width="brightness * 60" ...
我怎样才能达到那种效果?
我使用的 svg 如下。我想创建彩虹圈,并且必须根据所选的亮度更改圈的宽度。
宽度变化正确,但我想保持内半径不变。
<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400" viewBox="-35 -35 270 270">
<defs>
<linearGradient id="redyel" gradientUnits="objectBoundingBox" x1="0" y1="0" x2="1" y2="1">
<stop offset="0%" stop-color="#ff0000" :stop-opacity="saturation"/>
<stop offset="100%" stop-color="#ffff00" :stop-opacity="saturation"/>
</linearGradient>
<linearGradient id="yelgre" gradientUnits="objectBoundingBox" x1="0" y1="0" x2="0" y2="1">
<stop offset="0%" stop-color="#ffff00" :stop-opacity="saturation"/>
<stop offset="100%" stop-color="#00ff00" :stop-opacity="saturation"/>
</linearGradient>
<linearGradient id="grecya" gradientUnits="objectBoundingBox" x1="1" y1="0" x2="0" y2="1">
<stop offset="0%" stop-color="#00ff00" :stop-opacity="saturation"/>
<stop offset="100%" stop-color="#00ffff" :stop-opacity="saturation"/>
</linearGradient>
<linearGradient id="cyablu" gradientUnits="objectBoundingBox" x1="1" y1="1" x2="0" y2="0">
<stop offset="0%" stop-color="#00ffff" :stop-opacity="saturation"/>
<stop offset="100%" stop-color="#0000ff" :stop-opacity="saturation"/>
</linearGradient>
<linearGradient id="blumag" gradientUnits="objectBoundingBox" x1="0" y1="1" x2="0" y2="0">
<stop offset="0%" stop-color="#0000ff" :stop-opacity="saturation"/>
<stop offset="100%" stop-color="#ff00ff" :stop-opacity="saturation"/>
</linearGradient>
<linearGradient id="magred" gradientUnits="objectBoundingBox" x1="0" y1="1" x2="1" y2="0">
<stop offset="0%" stop-color="#ff00ff" :stop-opacity="saturation"/>
<stop offset="100%" stop-color="#ff0000" :stop-opacity="saturation"/>
</linearGradient>
</defs>
<g fill="none" :stroke-width="brightness * 60" transform="translate(100,100)">
<path d="M 0,-100 A 100,100 0 0,1 86.6,-50" stroke="url(#redyel)"/>
<path d="M 86.6,-50 A 100,100 0 0,1 86.6,50" stroke="url(#yelgre)"/>
<path d="M 86.6,50 A 100,100 0 0,1 0,100" stroke="url(#grecya)"/>
<path d="M 0,100 A 100,100 0 0,1 -86.6,50" stroke="url(#cyablu)"/>
<path d="M -86.6,50 A 100,100 0 0,1 -86.6,-50" stroke="url(#blumag)"/>
<path d="M -86.6,-50 A 100,100 0 0,1 0,-100" stroke="url(#magred)"/>
</g>
<circle cx="100" cy="100" r="65" :fill="hsla"/>
</svg>
最佳答案
圆的笔划的内半径始终小于半径的笔划宽度的一半,因此要将内半径保持在同一位置,您必须将圆的半径增加其笔划的一半,例如:https://jsfiddle.net/f3wctoyL/1/
<svg width="400" height="400">
<circle id="a" cx="200" cy="200" r="100" />
<circle id="b" cx="200" cy="200" r="110" />
<circle id="c" cx="200" cy="200" r="105" />
</svg>
圆 b 和 c 上的笔划的内半径为 100。
关于javascript - 如何在不改变圆内半径的情况下改变笔画宽度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55783336/