77 lines
1.7 KiB
JavaScript
77 lines
1.7 KiB
JavaScript
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/**
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* Converts various color input formats to an {r:0,g:0,b:0} object.
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*
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* @param {string} color The string representation of a color
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* @example
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* colorToRgb('#000');
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* @example
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* colorToRgb('#000000');
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* @example
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* colorToRgb('rgb(0,0,0)');
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* @example
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* colorToRgb('rgba(0,0,0)');
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*
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* @return {{r: number, g: number, b: number, [a]: number}|null}
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*/
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export const colorToRgb = ( color ) => {
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let hex3 = color.match( /^#([0-9a-f]{3})$/i );
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if( hex3 && hex3[1] ) {
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hex3 = hex3[1];
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return {
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r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
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g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
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b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
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};
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}
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let hex6 = color.match( /^#([0-9a-f]{6})$/i );
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if( hex6 && hex6[1] ) {
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hex6 = hex6[1];
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return {
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r: parseInt( hex6.slice( 0, 2 ), 16 ),
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g: parseInt( hex6.slice( 2, 4 ), 16 ),
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b: parseInt( hex6.slice( 4, 6 ), 16 )
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};
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}
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let rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
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if( rgb ) {
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return {
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r: parseInt( rgb[1], 10 ),
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g: parseInt( rgb[2], 10 ),
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b: parseInt( rgb[3], 10 )
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};
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}
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let rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
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if( rgba ) {
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return {
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r: parseInt( rgba[1], 10 ),
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g: parseInt( rgba[2], 10 ),
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b: parseInt( rgba[3], 10 ),
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a: parseFloat( rgba[4] )
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};
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}
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return null;
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}
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/**
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* Calculates brightness on a scale of 0-255.
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*
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* @param {string} color See colorToRgb for supported formats.
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* @see {@link colorToRgb}
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*/
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export const colorBrightness = ( color ) => {
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if( typeof color === 'string' ) color = colorToRgb( color );
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if( color ) {
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return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
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}
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return null;
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}
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