CSS3 以循环方式线性渐变

Question

I am wondering if it is possible to do something like this with css gradients:

I have searched a lot and all the gradients are either "Linear" or "Radial". My desired gradient is linear in a circular way!

Answer 1

It's doable now - at least in Chrome. The CSS propertyconic-gradient can easily achieve this:

 html, body { margin: 0; padding: 0; } .box { position: absolute; width: 200px; height: 200px; left: 100px; } .colorwheel { background: conic-gradient(red, yellow, lime, aqua, blue, magenta, red); border-radius:50%; } .fallback { text-align: center; padding: 50px 0; }

 <div class="fallback box"> If you can read<br>this, your browser<br>doesn't support<br>conic-gradient yet. </div> <div class="colorwheel box"></div>

This CSS function is specified in a working draft of CSS Images Module Level 4 and is currently only implement by recent version of Chrome, Android browser and Safari (macOS and iOS) but neither by Firefox or Edge. Check Can I use for current support.

Answer 2

This is called Conical Gradient and is not currently possible in pure CSS, but it has been proposed for the CSS Image Values 4 draft. Recently Lea Verou created a polyfill for them, there is also a PostCSS plugin that does the same.

Answer 3

CSS

This can be completed using multiple sections which are then rotated to create a circle.

 .wheel, .umbrella, .color { content: ""; position: absolute; border-radius: 50%; width: 15em; height: 15em; margin: 0; padding: 0; } .wheel { overflow: hidden; width: 15em; height: 15em; position: relative; } .umbrella { position: relative; -webkit-transform: scale(1.35); } .color, .color:nth-child(n+7):after { clip: rect(0, 15em, 15em, 7.5em); } .color:after, .color:nth-child(n+7) { content: ""; position: absolute; border-radius: 50%; left: calc(50% - 7.5em); top: calc(50% - 7.5em); width: 15em; height: 15em; clip: rect(0, 7.5em, 15em, 0); } .color:nth-child(1):after { background-color: #9ED110; transform: rotate(30deg); z-index: 12; } .color:nth-child(2):after { background-color: #50B517; transform: rotate(60deg); z-index: 11; } .color:nth-child(3):after { background-color: #179067; transform: rotate(90deg); z-index: 10; } .color:nth-child(4):after { background-color: #476EAF; transform: rotate(120deg); z-index: 9; } .color:nth-child(5):after { background-color: #9f49ac; transform: rotate(150deg); z-index: 8; } .color:nth-child(6):after { background-color: #CC42A2; transform: rotate(180deg); z-index: 7; } .color:nth-child(7):after { background-color: #FF3BA7; transform: rotate(180deg); } .color:nth-child(8):after { background-color: #FF5800; transform: rotate(210deg); } .color:nth-child(9):after { background-color: #FF8100; transform: rotate(240deg); } .color:nth-child(10):after { background-color: #FEAC00; transform: rotate(270deg); } .color:nth-child(11):after { background-color: #FFCC00; transform: rotate(300deg); } .color:nth-child(12):after { background-color: #EDE604; transform: rotate(330deg); }

 <div class="wheel"> <ul class="umbrella"> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> </ul> </div>

To then get the blur, just use the transform function to add an appropriate blur.

 .wheel, .umbrella, .color { content: ""; position: absolute; border-radius: 50%; width: 15em; height: 15em; margin: 0; padding: 0; } .wheel { overflow: hidden; width: 15em; height: 15em; position: relative; } .umbrella { position: relative; filter: blur(.75em); -webkit-filter: blur(.75em); -moz-filter: blur(.75em); -o-filter: blur(.75em); -ms-filter: blur(.75em); filter: url(#blur); filter: progid: DXImageTransform.Microsoft.Blur(PixelRadius='.75'); -webkit-transform: scale(1.35); } .color, .color:nth-child(n+7):after { clip: rect(0, 15em, 15em, 7.5em); } .color:after, .color:nth-child(n+7) { content: ""; position: absolute; border-radius: 50%; left: calc(50% - 7.5em); top: calc(50% - 7.5em); width: 15em; height: 15em; clip: rect(0, 7.5em, 15em, 0); } .color:nth-child(1):after { background-color: #9ED110; transform: rotate(30deg); z-index: 12; } .color:nth-child(2):after { background-color: #50B517; transform: rotate(60deg); z-index: 11; } .color:nth-child(3):after { background-color: #179067; transform: rotate(90deg); z-index: 10; } .color:nth-child(4):after { background-color: #476EAF; transform: rotate(120deg); z-index: 9; } .color:nth-child(5):after { background-color: #9f49ac; transform: rotate(150deg); z-index: 8; } .color:nth-child(6):after { background-color: #CC42A2; transform: rotate(180deg); z-index: 7; } .color:nth-child(7):after { background-color: #FF3BA7; transform: rotate(180deg); } .color:nth-child(8):after { background-color: #FF5800; transform: rotate(210deg); } .color:nth-child(9):after { background-color: #FF8100; transform: rotate(240deg); } .color:nth-child(10):after { background-color: #FEAC00; transform: rotate(270deg); } .color:nth-child(11):after { background-color: #FFCC00; transform: rotate(300deg); } .color:nth-child(12):after { background-color: #EDE604; transform: rotate(330deg); }

 <div class="wheel"> <ul class="umbrella"> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> <li class="color"></li> </ul> </div> <svg version="1.1" xmlns="http://www.w3.org/2000/svg"> <filter id="blur"> <feGaussianBlur stdDeviation="3" /> </filter> </svg>

Please note, in older versions of IE or old browsers, snippets won't work as they use HTML5 technology to run. I recommend testing in a local environment.

Answer 4

I'm afraid CSS doesn't allow for a linear-radial gradient. However, svg provides a solution, albeit crude. See the below topics for a solution.

How to draw a linear gradient circle by svg?

svg multiple color on circle stroke

Answer 5

You can use 3 triangles cuted with common circle. Each triangle is transformed by central projection from long rectangle with linear gradient. I try it with SVG in Firefox, but Chromium does not support central projection in SVG but supports conical gradients, so see combined version for both browsers.

 <svg version="2" viewBox="-207 -207 414 414" xmlns="http://www.w3.org/2000/svg"> <defs> <radialGradient id="gWt"> <stop style="stop-color:#fff" offset="0"/> <stop style="stop-color:#fff0" offset="1"/> </radialGradient> <!-- part for firefox: using central projection of 3 rectangles --> <linearGradient id="gYM" x1="0" x2="0" y1="0" y2="100%"> <stop style="stop-color:#ef08" offset="0"/> <stop style="stop-color:#ff0" offset=".005"/> <stop style="stop-color:#fc0" offset=".1827"/> <stop style="stop-color:#f90" offset=".2924"/> <stop style="stop-color:#f60" offset=".3728"/> <stop style="stop-color:#f00" offset=".5"/> <stop style="stop-color:#f06" offset=".6272"/> <stop style="stop-color:#f09" offset=".7076"/> <stop style="stop-color:#f0c" offset=".8173"/> <stop style="stop-color:#f0f" offset=".995"/> <stop style="stop-color:#e0f8" offset="1"/> </linearGradient> <linearGradient id="gCY" href="#gYM"> <stop style="stop-color:#0ef8" offset="0"/> <stop style="stop-color:#0ff" offset=".005"/> <stop style="stop-color:#0fc" offset=".1827"/> <stop style="stop-color:#0f9" offset=".2924"/> <stop style="stop-color:#0f6" offset=".3728"/> <stop style="stop-color:#0f0" offset=".5"/> <stop style="stop-color:#6f0" offset=".6272"/> <stop style="stop-color:#9f0" offset=".7076"/> <stop style="stop-color:#cf0" offset=".8173"/> <stop style="stop-color:#ff0" offset=".995"/> <stop style="stop-color:#fe08" offset="1"/> </linearGradient> <linearGradient id="gMC" href="#gYM"> <stop style="stop-color:#f0e8" offset="0"/> <stop style="stop-color:#f0f" offset=".005"/> <stop style="stop-color:#c0f" offset=".1827"/> <stop style="stop-color:#90f" offset=".2924"/> <stop style="stop-color:#60f" offset=".3728"/> <stop style="stop-color:#00f" offset=".5"/> <stop style="stop-color:#06f" offset=".6272"/> <stop style="stop-color:#09f" offset=".7076"/> <stop style="stop-color:#0cf" offset=".8173"/> <stop style="stop-color:#0ff" offset=".995"/> <stop style="stop-color:#0fe8" offset="1"/> </linearGradient> <rect id="r" width="2000" height="700" style="transform:matrix3d( -29,0,0,100, 0,1,0,0, 0,0,1,0, 200,-350,1,1 ); mix-blend-mode:lighten"/> </defs> <clipPath id="cc"> <circle r="200" id="c"/> </clipPath> <circle r="199" fill="#000"/> <g clip-path="url(#cc)" id="m"> <use href="#r" fill="url(#gCY)" transform="rotate(-120)"/> <use href="#r" fill="url(#gYM)"/> <use href="#r" fill="url(#gMC)" transform="rotate(120)"/> <!-- for Chrome use conic gradient (does not work with any svg object but with foreign) Firefox ignores this object due to unknown keyword in style --> <foreignObject width="400" height="400" x="-200" y="-200" style="background:conic-gradient(from 90deg, #f00,#f0f,#00f,#0ff,#0f0,#ff0,#f00); background-repeat: no-repeat; background-position: center center; background-size: auto;"/> </g> <g> <!-- Points for visual test --> <circle cx="-200" r="6" fill="#0ff"/> <circle cx="-195.6" cy="-41.6" r="6" fill="#0fc"/> <circle cx="-182.7" cy="-81.3" r="6" fill="#0f9"/> <circle cx="-161.8" cy="-117.6" r="6" fill="#0f6"/> <circle cx="-133.8" cy="-148.6" r="6" fill="#0f3"/> <circle cx="-100" cy="-173.2" r="6" fill="#0f0"/> <circle cx="-61.8" cy="-190.2" r="6" fill="#3f0"/> <circle cx="-20.9" cy="-198.9" r="6" fill="#6f0"/> <circle cx="20.9" cy="-198.9" r="6" fill="#9f0"/> <circle cx="61.8" cy="-190.2" r="6" fill="#cf0"/> <circle cx="100" cy="-173.2" r="6" fill="#ff0"/> <circle cx="133.8" cy="-148.6" r="6" fill="#fc0"/> <circle cx="161.8" cy="-117.6" r="6" fill="#f90"/> <circle cx="182.7" cy="-81.3" r="6" fill="#f60"/> <circle cx="195.6" cy="-41.6" r="6" fill="#f30"/> <circle cx="200" r="6" fill="#f00"/> <circle cx="-195.6" cy="41.6" r="6" fill="#0cf"/> <circle cx="-182.7" cy="81.3" r="6" fill="#09f"/> <circle cx="-161.8" cy="117.6" r="6" fill="#06f"/> <circle cx="-133.8" cy="148.6" r="6" fill="#03f"/> <circle cx="-100" cy="173.2" r="6" fill="#00f"/> <circle cx="-61.8" cy="190.2" r="6" fill="#30f"/> <circle cx="-20.9" cy="198.9" r="6" fill="#60f"/> <circle cx="20.9" cy="198.9" r="6" fill="#90f"/> <circle cx="61.8" cy="190.2" r="6" fill="#c0f"/> <circle cx="100" cy="173.2" r="6" fill="#f0f"/> <circle cx="133.8" cy="148.6" r="6" fill="#f0c"/> <circle cx="161.8" cy="117.6" r="6" fill="#f09"/> <circle cx="182.7" cy="81.3" r="6" fill="#f06"/> <circle cx="195.6" cy="41.6" r="6" fill="#f03"/> </g> <circle r="200" fill="url(#gWt)"/> </svg>

Offset values is calculated using the formula (for rectangular triangle 350x200):

0.5 ± tan(v/255.*pi/3)/350*100.

Where v is the value of the changing color channel.

HTML version (view the snippet in full window on Chrome)

 *{ margin:0; padding:0; } .c{ height:90vmin; width:90vmin; margin:5vmin; overflow: hidden; border-radius:50%; position:absolute; } .c>div{ position:relative; height:180vmin; width:100vmin; perspective: 0.40vmin; top:-45vmin; left:-4.8vmin; } .c>div>div{ height: 100%; width: 100%; left:0; top:1%; height: 98%; transform-origin:99.98% 50%; position:relative; transform: rotate3d(0, 1, 0, -80deg); border:black; } #YM>div{ background:linear-gradient(#ef08,#ff0 0.5%,#fc0 18.27%,#f90 29.24%,#f60 37.28%,#f00 50%,#f06 62.72%,#f09 70.76%,#f0c 81.73%,#f0f 99.5%,#e0f8); } #MC{ transform: rotateZ(120deg); } #CY{ transform: rotateZ(-120deg); } #MC>div{ background:linear-gradient(#f0e8,#f0f 0.5%,#c0f 18.27%,#90f 29.24%,#60f 37.28%,#00f 50%,#06f 62.72%,#09f 70.76%,#0cf 81.73%,#0ff 99.5%,#0fe8); } #CY>div{ background:linear-gradient(#0ef8,#0ff 0.5%,#0fc 18.27%,#0f9 29.24%,#0f6 37.28%,#0f0 50%,#6f0 62.72%,#9f0 70.76%,#cf0 81.73%,#ff0 99.5%,#fe08); }

 <div class="c"><div id="YM"><div></div></div></div> <div class="c"><div id="MC"><div></div></div></div> <div class="c"><div id="CY"><div></div></div></div>

Answer 6

SVG made my work very hard. The best solution I found is to use multiple circle slices and color them. And it is pure css3.

The question is: How to make the color changes smooth? I found the answer: By using blur filters.

Here is the complete solution: Conical Gradients in CSS

Answer 7

I was just playing with an idea for this for my own project. I didn't wanna use 'conic-gradient' as the support is very low for it at this time (mid 2019). so I came up with the following:

  background: 
    radial-gradient(circle at 38% 7% ,rgba(255,255,000,1) 20%,rgba(255,255,000,.0) 38%),
    radial-gradient(circle at 50% 0%,rgba(128,255,000,1) 22%,rgba(128,255,000,.0) 48%),
    radial-gradient(circle at 75% 7% ,rgba(000,255,000,1) 22%,rgba(000,255,000,.0) 48%),
    radial-gradient(circle at 93% 24%  ,rgba(000,255,128,1) 22%,rgba(000,255,128,.0) 48%),
    radial-gradient(circle at 100% 50%,rgba(000,255,255,1) 22%,rgba(000,255,255,.0) 48%),
    radial-gradient(circle at 93% 75% ,rgba(000,128,255,1) 22%,rgba(000,128,255,.0) 48%),
    radial-gradient(circle at 75% 93%,rgba(000,000,255,1) 22%,rgba(000,000,255,.0) 48%),
    radial-gradient(circle at 50% 100% ,rgba(128,000,255,1) 22%,rgba(128,000,255,.0) 48%),
    radial-gradient(circle at 25% 93%,rgba(255,000,255,1) 22%,rgba(255,000,255,.0) 48%),
    radial-gradient(circle at 7% 75%,rgba(255,000,128,1) 22%,rgba(255,000,128,.0) 48%),
    radial-gradient(circle at 0% 50%,rgba(255,000,000,1) 22%,rgba(255,000,000,.0) 48%),
    radial-gradient(circle at 7% 25%,rgba(255,128,000,1) 22%,rgba(255,128,000,.0) 48%);

https://jsfiddle.net/p5vxek3u/

Its not exact, but its close enough for my needs. I'm using it behind something with alpha transparency so you only get to see a small part at a time.

I thought I'd leave it here in case anyone needed it.