Utils to convert css gradients to svg

Installation

from npm

npm install gradient-utils

from yarn

yarn add gradient-utils

Usage

gradient-utils/gradient-parser

parseLinearGradient

Parse css linear-gradient return LinearGradient | null

parseRepeatingLinearGradient

Parse css repeating-linear-gradient return LinearGradient | null

If the gradient is without an angle, then returns 180deg according to the specification

If the color cannot be parsed, Unknown Color will be returned

isLinearGradientWithAngle

Checks if parsed gradient is gradient with angle e.g. linear-gradient(217deg, red, green)

isLinearGradientWithSideOrCorner

Checks if parsed gradient is gradient with side or corner e.g. linear-gradient(to left, red, green)

isLinearGradientWithInterpolation

Checks if parsed gradient is gradient with interpolation e.g. linear-gradient(in hsl, blue, red)

gradient-utils/convert-css-gradient-to-svg

convertLinearGradient

Convert LinearGradient to SVGLinearGradient based on aspect ratio. If it is impossible to convert, writes a warning to the console and returns null

Does not support

• repeatable gradient
• interpolation gradient
• if there are less than two colors in the gradient
• color hint e.g. linear-gradient(red, 30%, blue);
• color length except percentage

getSvgColor Default css to svg color converter. The named color is returned as is. (Don't check if color is supported in svg). Supports HEX, RGB, HSL colors.

gradient-utils/svg-gradient-from-css

Uses the functions described above to convert a css linear gradient to an svg gradient

Example

const cssGradient = getComputedStyle(element).getPropertyValue(propertyName)
const gradientId = 'new-gradient-id'
const converted = generateLinearGradient(cssGradient, aspectRatio)
if (converted) {
    const link = `url(#${gradientId})`
    const linearGradient = <linearGradient
        key={gradientId}
        id={gradientId}
        x1={converted.x1}
        y1={converted.y1}
        x2={converted.x2}
        y2={converted.y2}
        gradientUnits='userSpaceOnUse'
    >
        {converted.colorStops.map((stop, index) => (<stop key={index} {...stop} />))}
    </linearGradient>
}

...

<svg>
  <defs>
    {linearGradient}
  </defs>
  <rect  x="10" y="10" rx="15" ry="15" width="100" height="100" fill={link} />
</svg>