mirror of
https://github.com/hakimel/reveal.js.git
synced 2025-07-26 17:30:21 +02:00
2d273bf06c
There are various other commas in the same regex that aren't escaped. This one doesn't need escaping either.
77 lines
1.7 KiB
JavaScript
77 lines
1.7 KiB
JavaScript
/**
|
|
* Converts various color input formats to an {r:0,g:0,b:0} object.
|
|
*
|
|
* @param {string} color The string representation of a color
|
|
* @example
|
|
* colorToRgb('#000');
|
|
* @example
|
|
* colorToRgb('#000000');
|
|
* @example
|
|
* colorToRgb('rgb(0,0,0)');
|
|
* @example
|
|
* colorToRgb('rgba(0,0,0)');
|
|
*
|
|
* @return {{r: number, g: number, b: number, [a]: number}|null}
|
|
*/
|
|
export const colorToRgb = ( color ) => {
|
|
|
|
let hex3 = color.match( /^#([0-9a-f]{3})$/i );
|
|
if( hex3 && hex3[1] ) {
|
|
hex3 = hex3[1];
|
|
return {
|
|
r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
|
|
g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
|
|
b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
|
|
};
|
|
}
|
|
|
|
let hex6 = color.match( /^#([0-9a-f]{6})$/i );
|
|
if( hex6 && hex6[1] ) {
|
|
hex6 = hex6[1];
|
|
return {
|
|
r: parseInt( hex6.slice( 0, 2 ), 16 ),
|
|
g: parseInt( hex6.slice( 2, 4 ), 16 ),
|
|
b: parseInt( hex6.slice( 4, 6 ), 16 )
|
|
};
|
|
}
|
|
|
|
let rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
|
|
if( rgb ) {
|
|
return {
|
|
r: parseInt( rgb[1], 10 ),
|
|
g: parseInt( rgb[2], 10 ),
|
|
b: parseInt( rgb[3], 10 )
|
|
};
|
|
}
|
|
|
|
let rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
|
|
if( rgba ) {
|
|
return {
|
|
r: parseInt( rgba[1], 10 ),
|
|
g: parseInt( rgba[2], 10 ),
|
|
b: parseInt( rgba[3], 10 ),
|
|
a: parseFloat( rgba[4] )
|
|
};
|
|
}
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
/**
|
|
* Calculates brightness on a scale of 0-255.
|
|
*
|
|
* @param {string} color See colorToRgb for supported formats.
|
|
* @see {@link colorToRgb}
|
|
*/
|
|
export const colorBrightness = ( color ) => {
|
|
|
|
if( typeof color === 'string' ) color = colorToRgb( color );
|
|
|
|
if( color ) {
|
|
return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
|
|
}
|
|
|
|
return null;
|
|
|
|
} |