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56 lines
1.6 KiB
56 lines
1.6 KiB
3 years ago
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// @flow
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import constructGradientValue from '../internalHelpers/_constructGradientValue'
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import PolishedError from '../internalHelpers/_errors'
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import type { RadialGradientConfiguration } from '../types/radialGradientConfiguration'
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import type { Styles } from '../types/style'
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/**
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* CSS for declaring a radial gradient, including a fallback background-color. The fallback is either the first color-stop or an explicitly passed fallback color.
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*
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* @example
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* // Styles as object usage
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* const styles = {
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* ...radialGradient({
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* colorStops: ['#00FFFF 0%', 'rgba(0, 0, 255, 0) 50%', '#0000FF 95%'],
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* extent: 'farthest-corner at 45px 45px',
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* position: 'center',
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* shape: 'ellipse',
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* })
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* }
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*
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* // styled-components usage
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* const div = styled.div`
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* ${radialGradient({
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* colorStops: ['#00FFFF 0%', 'rgba(0, 0, 255, 0) 50%', '#0000FF 95%'],
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* extent: 'farthest-corner at 45px 45px',
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* position: 'center',
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* shape: 'ellipse',
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* })}
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*`
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*
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* // CSS as JS Output
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*
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* div: {
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* 'backgroundColor': '#00FFFF',
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* 'backgroundImage': 'radial-gradient(center ellipse farthest-corner at 45px 45px, #00FFFF 0%, rgba(0, 0, 255, 0) 50%, #0000FF 95%)',
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* }
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*/
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export default function radialGradient({
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colorStops,
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extent = '',
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fallback,
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position = '',
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shape = '',
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}: RadialGradientConfiguration): Styles {
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if (!colorStops || colorStops.length < 2) {
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throw new PolishedError(57)
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}
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return {
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backgroundColor: fallback || colorStops[0].split(' ')[0],
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backgroundImage: constructGradientValue`radial-gradient(${position}${shape}${extent}${colorStops.join(
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', ',
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)})`,
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}
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}
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